WO2013120035A1 - Enhancing fermentation of starch-and sugar-based feedstocks - Google Patents
Enhancing fermentation of starch-and sugar-based feedstocks Download PDFInfo
- Publication number
- WO2013120035A1 WO2013120035A1 PCT/US2013/025457 US2013025457W WO2013120035A1 WO 2013120035 A1 WO2013120035 A1 WO 2013120035A1 US 2013025457 W US2013025457 W US 2013025457W WO 2013120035 A1 WO2013120035 A1 WO 2013120035A1
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- WIPO (PCT)
- Prior art keywords
- biomass
- monosaccharides
- cellulosic
- fermentation
- derived
- Prior art date
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- UIUJIQZEACWQSV-UHFFFAOYSA-N succinic semialdehyde Chemical compound OC(=O)CCC=O UIUJIQZEACWQSV-UHFFFAOYSA-N 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 150000003505 terpenes Chemical class 0.000 description 1
- TUNFSRHWOTWDNC-UHFFFAOYSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 231100000167 toxic agent Toxicity 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- SZHOJFHSIKHZHA-UHFFFAOYSA-M tridecanoate Chemical compound CCCCCCCCCCCCC([O-])=O SZHOJFHSIKHZHA-UHFFFAOYSA-M 0.000 description 1
- ZDPHROOEEOARMN-UHFFFAOYSA-N undecanoic acid Chemical compound CCCCCCCCCCC(O)=O ZDPHROOEEOARMN-UHFFFAOYSA-N 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 210000003934 vacuole Anatomy 0.000 description 1
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
- UHVMMEOXYDMDKI-JKYCWFKZSA-L zinc;1-(5-cyanopyridin-2-yl)-3-[(1s,2s)-2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate Chemical compound [Zn+2].CC([O-])=O.CC([O-])=O.CCC(=O)C1=CC=C(F)C([C@H]2[C@H](C2)NC(=O)NC=2N=CC(=CC=2)C#N)=C1O UHVMMEOXYDMDKI-JKYCWFKZSA-L 0.000 description 1
- PIAOXUVIBAKVSP-UHFFFAOYSA-N γ-hydroxybutyraldehyde Chemical compound OCCCC=O PIAOXUVIBAKVSP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/14—Fungi; Culture media therefor
- C12N1/16—Yeasts; Culture media therefor
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/14—Fungi; Culture media therefor
- C12N1/16—Yeasts; Culture media therefor
- C12N1/18—Baker's yeast; Brewer's yeast
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/02—Preparation of oxygen-containing organic compounds containing a hydroxy group
- C12P7/04—Preparation of oxygen-containing organic compounds containing a hydroxy group acyclic
- C12P7/06—Ethanol, i.e. non-beverage
- C12P7/08—Ethanol, i.e. non-beverage produced as by-product or from waste or cellulosic material substrate
- C12P7/10—Ethanol, i.e. non-beverage produced as by-product or from waste or cellulosic material substrate substrate containing cellulosic material
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/02—Preparation of oxygen-containing organic compounds containing a hydroxy group
- C12P7/04—Preparation of oxygen-containing organic compounds containing a hydroxy group acyclic
- C12P7/18—Preparation of oxygen-containing organic compounds containing a hydroxy group acyclic polyhydric
- C12P7/20—Glycerol
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
Definitions
- a major contributing factor to this cost is transportation of biomass feedstock from the location where feedstock is grown to the location where it is processed into biofuels and chemicals. More efficient use of starch fermentation, supplemented with sugars from non-starch cellulosic materials would help defray these costs. Although the supplementation of cellulosic sugars assists in starch production, it would be helpful to optimize this process in a manner wherein fermenting organisms can utilize the maximum amount of sugar provided to them.
- the alcohol is ethanol.
- the polyol is glycerol.
- the broth comprising the blended feedstock has a lower osmolarity than a broth containing only the first biomass at an equivalent total saccharide level in monosaccharide equivalents.
- saccharide stream further comprises C5 monosaccharides.
- the C6 monosaccharides comprise cellulosic-derived C6 monosaccharides, non-cellulosic derived C6 monosaccharides, or a combination thereof.
- the alcohol yield is increased by about 1% to about 100% relative to fermentation of the first biomass without the saccharide stream.
- the alcohol is produced at a rate that is faster relative to fermentation of the first biomass without the saccharide stream. In some embodiments, the alcohol is produced at a rate that is about 1% to about 100% faster relative to fermentation of the first biomass without the saccharide stream. In some embodiments, the C6 monosaccharides of the saccharide stream are at a concentration that differs from a concentration of the non-cellulosic saccharides in the first biomass by less than +/- 50%, wherein the concentration of non-cellulosic saccharides in the first biomass is in monosaccharide equivalents.
- the C6 monosaccharides of the saccharide stream are at a concentration that differs from a concentration of the non- cellulosic saccharides in the first biomass by less than +/- 25%, wherein the concentration of non-cellulosic saccharides in the first biomass is in monosaccharide equivalents.
- the method is a fed-batch fermentation wherein the saccharide stream is added over time.
- the saccharide stream is added at a rate of from about 0.01 mL/min/L of broth to about 5 mL/min/L of broth during the fermenting.
- the polyols yield is decreased by about 1% to about 100% relative to the non- fed batch fermentation.
- the first biomass comprises starch, sucrose, or a combination thereof.
- the first biomass comprises corn, corn mash, sugar cane, sugar beets, sugar palms, sweet sorghum, nypa palm, cassava, rice, milo, sorghum, sweet potatoes, wheat, molasses, tubers, roots, stems, whole grains, barley, rye, milo, sago, cassaya, tapioca, rice peas, beans, potatoes, beets, fruits, or a combination thereof.
- the saccharide stream is produced from the pretreatment and/or hydrolysis of cellulose, hemicellulose, hgnocellulose material, starch, or a combination thereof. In some embodiments, the saccharide stream is produced by the pretreatment and/or hydrolysis of a second biomass comprising cellulose, hemicellulose, and/or hgnocellulose.
- the second biomass comprises corn, corn syrup, corn stover, corn cobs, molasses, silage, grass, straw, grain hulls, bagasse, distiller's grains, distiller's dried solubles, distiller's dried grains, condensed distiller's solubles, distiller's wet grains, distiller's dried grains with solubles, wood, bark, sawdust, paper, poplars, willows, switchgrass, alfalfa, prairie bluestem, algae, fruit peels, pits, sorghum, sweet sorghum, sugar cane, switch grass, rice, rice straw, rice hulls, wheat, wheat straw, barley, barley straw, bamboo, seeds, seed hulls, oats, oat hulls, food waste, municipal sewage waste, or a combination thereof.
- the one or more biocatalysts comprise one or more fermenting
- the one or more biocatalysts comprise one or more yeasts and/or one or more bacteria. In some embodiments, the one or more biocatalysts comprise one or more yeasts. In some embodiments, the one or more biocatalysts comprise one or more strains of Saccharomyces cerevisiae. In some embodiments, at least one of the one or more biocatalysts is a genetically-modified yeast that ferments C5 and C6 saccharides. In some embodiments, at least one of the one or more biocatalysts is a bacteria that hydro lyzes and/or ferments C5 and C6 saccharides.
- At least one of the one or more biocatalysts is a hydro lytic enzyme.
- the one or more biocatalysts comprise an endoglucanase, an exoglucanase, a cellobiohydrolase, a cellulase, a beta-glucosidase, a glycoside hydrolase, a glycosyltransferase, a lyase, an esterase, a glucamylase, or a combination thereof.
- at least one of the one or more biocatalysts is an enzyme that hydro lyzes starch.
- At least one of the one or more biocatalysts is an alpha-amylase, glucoamylase, beta-amylase, exo-alpha-1 ,4- glucanase, or pullulanase.
- the one or more biocatalysts comprise at least one fermenting microorganism and at least one hydrolytic enzyme.
- the one or more biocatalysts comprise at least one fermenting microorganism that is a yeast or bacteria and at least one enzyme that hydrolyzes starch.
- the blended feedstock comprises less than 100 g/L monosaccharides prior to contacting with the one or more biocatalysts. In some embodiments, the blended feedstock comprises from about 1 g/L to about 100 g/L monosaccharides prior to contacting with the one or more biocatalysts. In some embodiments, the first biomass and the saccharide stream are combined in a ratio of from about 50:50 to 99: 1 (first biomass: saccharide stream) by volume or by weightvolume. In some embodiments, the first biomass and the saccharide stream are combined in a ratio of about 80:20 (first biomass: saccharide stream) by volume or by weightvolume.
- the first biomass and the saccharide stream are combined in a ratio of about 90: 10 (first biomass: saccharide stream) by volume or by weightvolume.
- the blended feedstock comprises from about 10% to about 50%) solids from the first biomass.
- the blended feedstock comprises from about 20% to about 40% solids from the first biomass.
- the blended feedstock comprises from about 30%> to about 36% solids from the first biomass.
- the C6 monosaccharides of the saccharide stream are at a concentration of from about 10% to about 70% w/v prior to combining with the first biomass.
- the C6 monosaccharides of the saccharide stream are at a
- concentration of from about 20% to about 50% w/v prior to combining with the first biomass are also disclosed.
- fermentation end-products produced by these methods are ethanol.
- the yield of the at least one of the one or more fermentation end-products is increased by about 1% to about 100% relative to fermentation of the first biomass without the one or more cellulosic-derived C6 monosaccharides. In some embodiments, at least one of the one or more fermentation end-products is produced at a rate that is faster relative to fermentation of the first biomass without the one or more cellulosic-derived C6
- the one or more fermentation end- products is produced at a rate that is about 1% to about 100% faster relative to fermentation of the first biomass without the one or more cellulosic-derived C6 monosaccharides.
- the one or more cellulosic-derived C6 monosaccharides are at a concentration that differs from a concentration of saccharides in the first biomass by less than +/- 50%, wherein the concentration of saccharides in the first biomass is in monosaccharide
- the one or more cellulosic-derived C6 monosaccharides are at a concentration that differs from a concentration of saccharides in the first biomass by less than +/- 25%, wherein the concentration of saccharides in the first biomass is in monosaccharide equivalents.
- the one or more fermentation end- products comprise one or more alcohols.
- the one or more fermentation end-products comprise ethanol.
- the method is a fed-batch
- the one or more cellulosic-derived C6 monosaccharides are added over time.
- the one or more cellulosic-derived C6 monosaccharides are added at a rate of from about 0.01 mL/min/L of broth to about 5 mL/min/L of broth during the fermenting.
- a yield of one or more other products is decreased relative to a non-fed batch fermentation.
- the yield of the one or more other products is decreased by about 1% to about 100% relative to the non-fed batch fermentation.
- the one or more other products comprise one or more polyols or sugar alcohols.
- the one or more other products comprise methanol, glycol, glycerol, erythritol, threitol, arabitol, xylitol, ribitol, mannitol, sorbitol, dulcitol, fucitol, iditol, inositol, volemitol, isomalt, maltitol, lactitol, polyglycitol, or a combination thereof.
- the one or more other products comprise glycerol.
- the first biomass comprises non-cellulosic sugars.
- the first biomass comprises non-cellulosic oligosaccharides.
- the first biomass comprises starch.
- the first biomass comprises corn, corn mash, sugar cane, sugar beets, sugar palms, sweet sorghum, nypa palm, cassava, rice, milo, sorghum, sweet potatoes, wheat, molasses, tubers, roots, stems, whole grains, barley, rye, milo, sago, cassaya, tapioca, rice peas, beans, potatoes, beets, fruits, or a combination thereof.
- the one or more cellulo sic-derived C6 monosaccharides are produced from the pretreatment and/or hydrolysis of cellulose, hemicellulose, or lignocellulose material. In some embodiments, the one or more cellulosic- derived C6 monosaccharides are produced by the pretreatment and/or hydrolysis of a second biomass comprising cellulose, hemicellulose, or lignocellulose.
- the second biomass comprises corn, corn syrup, corn stover, corn cobs, molasses, silage, grass, straw, grain hulls, bagasse, distiller's grains, distiller's dried solubles, distiller's dried grains, condensed distiller's solubles, distiller's wet grains, distiller's dried grains with solubles, wood, bark, sawdust, paper, poplars, willows, switchgrass, alfalfa, prairie bluestem, algae, fruit peels, pits, sorghum, sweet sorghum, sugar cane, switch grass, rice, rice straw, rice hulls, wheat, wheat straw, barley, barley straw, bamboo, seeds, seed hulls, oats, oat hulls, food waste, municipal sewage waste, or a combination thereof.
- the one or more biocatalysts comprise one or more fermenting microorganisms. In some embodiments, the one or more biocatalysts comprise one or more yeasts and/or one or more bacteria. In some embodiments, the one or more biocatalysts comprise one or more yeasts. In some embodiments, the one or more biocatalysts comprise one or more strains of Saccharomyces cerevisiae. In some embodiments, at least one of the one or more biocatalysts is a genetically- modified yeast that ferments C5 and C6 saccharides.
- At least one of the one or more biocatalysts is a bacteria that hydrolyzes and/or ferments C5 and C6 saccharides. In some embodiments, at least one of the one or more biocatalysts is a hydrolytic enzyme. In some embodiments, the one or more biocatalysts comprise an endoglucanase, an exoglucanase, a cellobiohydrolase, a cellulase, a beta-glucosidase, a glycoside hydrolase, a glycosyltransferase, a lyase, an esterase, a glucamylase, or a combination thereof.
- At least one of the one or more biocatalysts is an enzyme that hydro lyzes starch. In some embodiments, at least one of the one or more biocatalysts is an alpha- amylase, glucoamylase, beta-amylase, exo-alpha-l ,4-glucanase, or pullulanase. In some embodiments, the one or more biocatalysts comprise at least one fermenting microorganism and at least one hydro lytic enzyme. In some embodiments, the one or more biocatalysts comprise at least one fermenting microorganism that is a yeast or bacteria and at least one enzyme that hydro lyzes starch. In some embodiments, the blended feedstock comprises less than 100 g/L monosaccharides prior to contacting with the one or more biocatalysts. In some embodiments, the blended feedstock comprises from about 1 g/L to about 100 g/L
- the first biomass and the one or more cellulosic-derived C6 monosaccharides are combined in a ratio of from about 50:50 to 99:1 (first biomass: cellulosic-derived C6 monosaccharides) by volume or by weight: volume. In some embodiments, the first biomass and the one or more cellulosic-derived C6 monosaccharides are combined in a ratio of about 80:20 (first biomass: cellulosic-derived C6 monosaccharides) by volume or by
- the first biomass and the one or more cellulosic- derived C6 monosaccharides are combined in a ratio of about 90: 10 (first biomass: cellulosic- derived C6 monosaccharides) by volume or by weightvolume.
- the blended feedstock comprises from about 10% to about 50% solids from the first biomass.
- the blended feedstock comprises from about 20%> to about 40%> solids from the first biomass.
- the blended feedstock comprises from about 30% to about 36% solids from the first biomass.
- the one or more cellulosic-derived C6 monosaccharides are at a concentration of from about 10% to about 70% w/v prior to combining with the first biomass.
- the one or more cellulosic-derived C6 monosaccharides are at a concentration of from about 20% to about 50% w/v prior to combining with the first biomass.
- fermentation end-products produced by the methods disclosed herein.
- the fermentation end-product is an alcohol.
- the fermentation end-product is ethanol.
- Also disclosed herein are methods of producing one or more fermentation end- products comprising: (a) combining a first biomass with one or more cellulosic-derived C6 monosaccharides to produce a blended feedstock in a broth; (b) contacting the blended feedstock with one or more biocatalysts; and (c) fermenting the first biomass and the one or more cellulo sic-derived C6 monosaccharides for sufficient time to produce one or more fermentation end-products from the blended feedstock, wherein at least one of the one or more fermentation end-products is produced at a rate that is faster relative to fermentation of the first biomass without the one or more cellulosic-derived C6 monosaccharides.
- a yield of at least one of the one or more fermentation end-products is increased relative to fermentation of the first biomass without the one or more cellulosic- derived C6 monosaccharides. In some embodiments, a yield of at least one of the one or more fermentation end-products is increased by about 1% to about 100% relative to fermentation of the first biomass without the one or more cellulosic-derived C6 monosaccharides. In some embodiments, the rate that the at least one of the one or more fermentation end-products is produced is about 1% to about 100% faster relative to fermentation of the first biomass without the one or more cellulosic-derived C6 monosaccharides. In some embodiments, the one or more cellulosic-derived C6 monosaccharides are at a concentration that differs from a concentration of saccharides in the first biomass by less than +/- 50%, wherein the
- concentration of saccharides in the first biomass is in monosaccharide equivalents.
- the one or more cellulosic-derived C6 monosaccharides are at a concentration that differs from a concentration of saccharides in the first biomass by less than +/- 25%, wherein the concentration of saccharides in the first biomass is in monosaccharide
- the one or more fermentation end-products comprise one or more alcohols. In some embodiments, the one or more fermentation end-products comprise ethanol. In some embodiments, the method is a fed-batch fermentation wherein the one or more cellulosic-derived C6 monosaccharides are added over time. In some embodiments, the one or more cellulosic-derived C6 monosaccharides are added at a rate of from about 0.01 mL/min/L of broth to about 5 mL/min/L of broth during the fermenting. In some
- a yield of one or more other products is decreased relative to a non-fed batch fermentation. In some embodiments, the yield of the one or more other products is decreased by about 1% to about 100% relative to the non-fed batch fermentation. In some embodiments, the one or more other products comprise one or more polyols or sugar alcohols.
- the one or more other products comprise methanol, glycol, glycerol, erythritol, threitol, arabitol, xylitol, ribitol, mannitol, sorbitol, dulcitol, fucitol, iditol, inositol, volemitol, isomalt, maltitol, lactitol, polyglycitol, or a combination thereof.
- the one or more other products comprise glycerol.
- the first biomass comprises non-cellulosic sugars.
- the first biomass comprises non- cellulosic oligosaccharides.
- the first biomass comprises starch.
- the first biomass comprises corn, corn mash, sugar cane, sugar beets, sugar palms, sweet sorghum, nypa palm, cassava, rice, milo, sorghum, sweet potatoes, wheat, molasses, tubers, roots, stems, whole grains, barley, rye, milo, sago, cassaya, tapioca, rice peas, beans, potatoes, beets, fruits, or a combination thereof.
- the one or more cellulosic-derived C6 monosaccharides are produced from the pretreatment and/or hydrolysis of cellulose, hemicellulose, or lignocellulose material. In some embodiments, the one or more cellulosic-derived C6 monosaccharides are produced by the pretreatment and/or hydrolysis of a second biomass comprising cellulose, hemicellulose, or lignocellulose.
- the second biomass comprises corn, corn syrup, corn stover, corn cobs, molasses, silage, grass, straw, grain hulls, bagasse, distiller's grains, distiller's dried solubles, distiller's dried grains, condensed distiller's solubles, distiller's wet grains, distiller's dried grains with solubles, wood, bark, sawdust, paper, poplars, willows, switchgrass, alfalfa, prairie bluestem, algae, fruit peels, pits, sorghum, sweet sorghum, sugar cane, switch grass, rice, rice straw, rice hulls, wheat, wheat straw, barley, barley straw, bamboo, seeds, seed hulls, oats, oat hulls, food waste, municipal sewage waste, or a combination thereof.
- the one or more biocatalysts comprise one or more fermenting
- the one or more biocatalysts comprise one or more yeasts and/or one or more bacteria. In some embodiments, the one or more biocatalysts comprise one or more yeasts. In some embodiments, the one or more biocatalysts comprise one or more strains of Saccharomyces cerevisiae. In some embodiments, at least one of the one or more biocatalysts is a genetically-modified yeast that ferments C5 and C6 saccharides. In some embodiments, at least one of the one or more biocatalysts is a bacteria that hydro lyzes and/or ferments C5 and C6 saccharides.
- At least one of the one or more biocatalysts is a hydro lytic enzyme.
- the one or more biocatalysts comprise an endoglucanase, an exoglucanase, a cellobiohydrolase, a cellulase, a beta-glucosidase, a glycoside hydrolase, a glycosyltransferase, a lyase, an esterase, a glucamylase, or a combination thereof.
- at least one of the one or more biocatalysts is an enzyme that hydro lyzes starch.
- At least one of the one or more biocatalysts is an alpha-amylase, glucoamylase, beta-amylase, exo-alpha-1,4- glucanase, or pullulanase.
- the one or more biocatalysts comprise at least one fermenting microorganism and at least one hydrolytic enzyme.
- the one or more biocatalysts comprise at least one fermenting microorganism that is a yeast or bacteria and at least one enzyme that hydrolyzes starch.
- the blended feedstock comprises less than 100 g/L monosaccharides prior to contacting with the one or more biocatalysts. In some embodiments, the blended feedstock comprises from about 1 g/L to about 100 g/L monosaccharides prior to contacting with the one or more biocatalysts.
- the first biomass and the one or more cellulosic-derived C6 monosaccharides are combined in a ratio of from about 50:50 to 99: 1 (first biomass: cellulosic-derived C6 monosaccharides) by volume or by weigh volume. In some embodiments, the first biomass and the one or more cellulosic-derived C6
- first biomass: cellulosic-derived C6 monosaccharides are combined in a ratio of about 80:20 (first biomass: cellulosic-derived C6 monosaccharides) by volume or by weight: volume.
- first biomass and the one or more cellulosic-derived C6 monosaccharides are combined in a ratio of about 90: 10 (first biomass: cellulosic-derived C6 monosaccharides) by volume or by
- the blended feedstock comprises from about 10% to about 50%) solids from the first biomass. In some embodiments, the blended feedstock comprises from about 20% to about 40% solids from the first biomass. In some embodiments, the blended feedstock comprises from about 30%> to about 36% solids from the first biomass. In some embodiments, the one or more cellulosic-derived C6 monosaccharides are at a concentration of from about 10% to about 70% w/v prior to combining with the first biomass. In some embodiments, the one or more cellulosic-derived C6 monosaccharides are at a concentration of from about 20% to about 50% w/v prior to combining with the first biomass.
- Also disclosed herein are methods of producing one or more fermentation end- products comprising: (a) combining a first biomass with one or more cellulosic-derived C6 monosaccharides to produce a blended feedstock in a broth; (b) contacting the blended feedstock with one or more biocatalysts; and (c) fermenting the first biomass and the one or more cellulosic-derived C6 monosaccharides for sufficient time to produce one or more fermentation end-products from the blended feedstock, wherein the one or more cellulosic- derived C6 monosaccharides are at a concentration that differs from a concentration of saccharides in the first biomass by less than +/- 50%, wherein the concentration of saccharides in the first biomass is in monosaccharide equivalents.
- a yield of at least one of the one or more fermentation end-products is increased relative to fermentation of the first biomass without the one or more cellulosic-derived C6
- fermentation end-products is increased by about 1% to about 100% relative to fermentation of the first biomass without the one or more cellulosic-derived C6 monosaccharides. In some embodiments, at least one of the one or more fermentation end-products is produced at a rate that is faster relative to fermentation of the first biomass without the one or more cellulosic- derived C6 monosaccharides. In some embodiments, at least one of the one or more fermentation end-products is produced at a rate that is about 1% to about 100% faster relative to fermentation of the first biomass without the one or more cellulosic-derived C6
- the concentration of the one or more cellulosic- derived C6 monosaccharides differs from the concentration of saccharides in the first biomass by less than +/- 25%, wherein the concentration of saccharides in the first biomass is in monosaccharide equivalents.
- the one or more fermentation end- products comprise one or more alcohols.
- the one or more fermentation end-products comprise ethanol.
- the method is a fed-batch
- the one or more cellulosic-derived C6 monosaccharides are added over time.
- the one or more cellulosic-derived C6 monosaccharides are added at a rate of from about 0.01 mL/min/L of broth to about 5 mL/min/L of broth during the fermenting.
- a yield of one or more other products is decreased relative to a non-fed batch fermentation.
- the yield of the one or more other products is decreased by about 1% to about 100% relative to the non-fed batch fermentation.
- the one or more other products comprise one or more polyols or sugar alcohols.
- the one or more other products comprise methanol, glycol, glycerol, erythritol, threitol, arabitol, xylitol, ribitol, mannitol, sorbitol, dulcitol, fucitol, iditol, inositol, volemitol, isomalt, maltitol, lactitol, polyglycitol, or a combination thereof.
- the one or more other products comprise glycerol.
- the first biomass comprises non-cellulosic sugars.
- the first biomass comprises non-cellulosic oligosaccharides.
- the first biomass comprises starch.
- the first biomass comprises corn, corn mash, sugar cane, sugar beets, sugar palms, sweet sorghum, nypa palm, cassava, rice, milo, sorghum, sweet potatoes, wheat, molasses, tubers, roots, stems, whole grains, barley, rye, milo, sago, cassaya, tapioca, rice peas, beans, potatoes, beets, fruits, or a combination thereof.
- the one or more cellulosic-derived C6 monosaccharides are produced from the pretreatment and/or hydrolysis of cellulose, hemicellulose, or lignocellulose material. In some embodiments, the one or more cellulosic- derived C6 monosaccharides are produced by the pretreatment and/or hydrolysis of a second biomass comprising cellulose, hemicellulose, or lignocellulose.
- the second biomass comprises corn, corn syrup, corn stover, corn cobs, molasses, silage, grass, straw, grain hulls, bagasse, distiller's grains, distiller's dried solubles, distiller's dried grains, condensed distiller's solubles, distiller's wet grains, distiller's dried grains with solubles, wood, bark, sawdust, paper, poplars, willows, switchgrass, alfalfa, prairie bluestem, algae, fruit peels, pits, sorghum, sweet sorghum, sugar cane, switch grass, rice, rice straw, rice hulls, wheat, wheat straw, barley, barley straw, bamboo, seeds, seed hulls, oats, oat hulls, food waste, municipal sewage waste, or a combination thereof.
- the one or more biocatalysts comprise one or more fermenting microorganisms. In some embodiments, the one or more biocatalysts comprise one or more yeasts and/or one or more bacteria. In some embodiments, the one or more biocatalysts comprise one or more yeasts. In some embodiments, the one or more biocatalysts comprise one or more strains of Saccharomyces cerevisiae. In some embodiments, at least one of the one or more biocatalysts is a genetically- modified yeast that ferments C5 and C6 saccharides.
- At least one of the one or more biocatalysts is a bacteria that hydrolyzes and/or ferments C5 and C6 saccharides. In some embodiments, at least one of the one or more biocatalysts is a hydrolytic enzyme. In some embodiments, the one or more biocatalysts comprise an endoglucanase, an exoglucanase, a cellobiohydrolase, a cellulase, a beta-glucosidase, a glycoside hydrolase, a glycosyltransferase, a lyase, an esterase, a glucamylase, or a combination thereof.
- At least one of the one or more biocatalysts is an enzyme that hydrolyzes starch. In some embodiments, at least one of the one or more biocatalysts is an alpha- amylase, glucoamylase, beta-amylase, exo-alpha-l ,4-glucanase, or pullulanase. In some embodiments, the one or more biocatalysts comprise at least one fermenting microorganism and at least one hydrolytic enzyme. In some embodiments, the one or more biocatalysts comprise at least one fermenting microorganism that is a yeast or bacteria and at least one enzyme that hydrolyzes starch. In some embodiments, the blended feedstock comprises less than 100 g/L monosaccharides prior to contacting with the one or more biocatalysts. In some embodiments, the blended feedstock comprises from about 1 g/L to about 100 g/L
- the first biomass and the one or more cellulosic-derived C6 monosaccharides are combined in a ratio of from about 50:50 to 99:1 (first biomass: cellulosic-derived C6 monosaccharides) by volume or by weight: volume. In some embodiments, the first biomass and the one or more cellulosic-derived C6 monosaccharides are combined in a ratio of about 80:20 (first biomass: cellulosic-derived C6 monosaccharides) by volume or by
- the first biomass and the one or more cellulosic- derived C6 monosaccharides are combined in a ratio of about 90: 10 (first biomass: cellulosic- derived C6 monosaccharides) by volume or by weigh volume.
- the blended feedstock comprises from about 10% to about 50%> solids from the first biomass.
- the blended feedstock comprises from about 20%> to about 40%> solids from the first biomass.
- the blended feedstock comprises from about 30% to about 36% solids from the first biomass.
- the one or more cellulosic-derived C6 monosaccharides are at a concentration of from about 10% to about 70% w/v prior to combining with the first biomass.
- the one or more cellulosic-derived C6 monosaccharides are at a concentration of from about 20% to about 50% w/v prior to combining with the first biomass.
- Disclosed herein are systems for producing one or more fermentation end-products comprising: (a) combining a fermentor comprising a broth; (b) a blended feedstock comprising a first biomass and one or more cellulosic-derived C6 monosaccharides in the broth; and (c) one or more biocatalysts.
- yield of at least one of the one or more fermentation end-products is increased relative to fermentation of the first biomass without the one or more cellulosic-derived C6 monosaccharides.
- the yield of the at least one of the one or more fermentation end-products is increased by about 1% to about 100% relative to fermentation of the first biomass without the one or more cellulosic-derived C6 monosaccharides. In some embodiments, at least one of the one or more fermentation end-products is produced at a rate that is faster relative to fermentation of the first biomass without the one or more cellulosic-derived C6
- the one or more fermentation end- products is produced at a rate that is about 1% to about 100% faster relative to fermentation of the first biomass without the one or more cellulosic-derived C6 monosaccharides.
- the one or more cellulosic-derived C6 monosaccharides are at a concentration that differs from a concentration of saccharides in the first biomass by less than +/- 50%, wherein the concentration of saccharides in the first biomass is in monosaccharide equivalents.
- the one or more cellulosic-derived C6 monosaccharides are at a concentration that differs from a concentration of saccharides in the first biomass by less than +/- 25%, wherein the concentration of saccharides in the first biomass is in monosaccharide equivalents.
- the one or more fermentation end- products comprise one or more alcohols.
- the one or more fermentation end-products comprise ethanol.
- the system further comprises a feeder to add the one or more cellulosic-derived C6 monosaccharides to the broth over time.
- the one or more cellulosic-derived C6 monosaccharides are added at a rate of from about 0.01 mL/min/L of broth to about 5 mL/min/L of broth.
- a yield of one or more other products is decreased relative to a system that does not contain the feeder.
- the yield of the one or more other products is decreased by about 1% to about 100% relative to the non-fed batch fermentation.
- the one or more other products comprise one or more polyols or sugar alcohols.
- the one or more other products comprise methanol, glycol, glycerol, erythritol, threitol, arabitol, xylitol, ribitol, mannitol, sorbitol, dulcitol, fucitol, iditol, inositol, volemitol, isomalt, maltitol, lactitol, polyglycitol, or a combination thereof.
- the one or more other products comprise glycerol.
- the first biomass comprises non-cellulosic sugars.
- the first biomass comprises non- cellulosic oligosaccharides.
- the first biomass comprises starch.
- the first biomass comprises corn, corn mash, sugar cane, sugar beets, sugar palms, sweet sorghum, nypa palm, cassava, rice, milo, sorghum, sweet potatoes, wheat, molasses, tubers, roots, stems, whole grains, barley, rye, milo, sago, cassaya, tapioca, rice peas, beans, potatoes, beets, fruits, or a combination thereof.
- the one or more cellulosic-derived C6 monosaccharides are produced from the pretreatment and/or hydrolysis of cellulose, hemicellulose, or lignocellulose material. In some embodiments, the one or more cellulosic-derived C6 monosaccharides are produced by the pretreatment and/or hydrolysis of a second biomass comprising cellulose, hemicellulose, or lignocellulose.
- the second biomass comprises corn, corn syrup, corn stover, corn cobs, molasses, silage, grass, straw, grain hulls, bagasse, distiller's grains, distiller's dried solubles, distiller's dried grains, condensed distiller's solubles, distiller's wet grains, distiller's dried grains with solubles, wood, bark, sawdust, paper, poplars, willows, switchgrass, alfalfa, prairie bluestem, algae, fruit peels, pits, sorghum, sweet sorghum, sugar cane, switch grass, rice, rice straw, rice hulls, wheat, wheat straw, barley, barley straw, bamboo, seeds, seed hulls, oats, oat hulls, food waste, municipal sewage waste, or a combination thereof.
- the one or more biocatalysts comprise one or more fermenting
- the one or more biocatalysts comprise one or more yeasts and/or one or more bacteria. In some embodiments, the one or more biocatalysts comprise one or more yeasts. In some embodiments, the one or more biocatalysts comprise one or more strains of Saccharomyces cerevisiae. In some embodiments, at least one of the one or more biocatalysts is a genetically-modified yeast that ferments C5 and C6 saccharides. In some embodiments, at least one of the one or more biocatalysts is a bacteria that hydro lyzes and/or ferments C5 and C6 saccharides.
- At least one of the one or more biocatalysts is a hydro lytic enzyme.
- the one or more biocatalysts comprise an endoglucanase, an exoglucanase, a cellobiohydrolase, a cellulase, a beta-glucosidase, a glycoside hydrolase, a glycosyltransferase, a lyase, an esterase, a glucamylase, or a combination thereof.
- at least one of the one or more biocatalysts is an enzyme that hydro lyzes starch.
- At least one of the one or more biocatalysts is an alpha-amylase, glucoamylase, beta-amylase, exo-alpha-1,4- glucanase, or pullulanase.
- the one or more biocatalysts comprise at least one fermenting microorganism and at least one hydrolytic enzyme.
- the one or more biocatalysts comprise at least one fermenting microorganism that is a yeast or bacteria and at least one enzyme that hydrolyzes starch.
- the blended feedstock comprises less than 100 g/L monosaccharides. In some embodiments, the blended feedstock comprises from about 1 g/L to about 100 g/L
- first biomass and the one or more cellulosic- derived C6 monosaccharides are in a ratio of from about 50:50 to 99: 1 (first biomass:
- the first biomass and the one or more cellulosic-derived C6 monosaccharides are in a ratio of about 80:20 (first biomass: cellulosic-derived C6 monosaccharides) by volume or by weigh volume. In some embodiments, the first biomass and the one or more cellulosic-derived C6 monosaccharides are in a ratio of about 90: 10 (first biomass: cellulosic- derived C6 monosaccharides) by volume or by weigh volume. In some embodiments, the blended feedstock comprises from about 10% to about 50%> solids from the first biomass.
- the blended feedstock comprises from about 20%> to about 40%> solids from the first biomass. In some embodiments, the blended feedstock comprises from about 30% to about 36% solids from the first biomass. In some embodiments, the one or more cellulosic-derived C6 monosaccharides are at a concentration of from about 10% to about 70% w/v prior to combining with the first biomass. In some embodiments, the one or more cellulosic-derived C6 monosaccharides are at a concentration of from about 20% to about 50% w/v prior to combining with the first biomass. In some embodiments, the system further comprises a hydrolysis unit for producing the one or more cellulosic-derived
- the system further comprises a filter for separating solids from the one or more cellulosic derived C6
- a yield of at least one of the one or more fermentation end-products is increased relative to fermentation of the first biomass without the one or more
- a yield of at least one of the one or more fermentation end-products is increased by about 1% to about 100% relative to fermentation of the first biomass without the one or more monosaccharides.
- a rate of production for at least one of the one or more fermentation end-products is increased relative to fermentation of the first biomass without the one or more monosaccharides.
- a rate of production for at least one of the one or more fermentation end- products is increased by about 1% to about 100% relative to fermentation of the first biomass without the one or more monosaccharides.
- the one or more fermentation end-products comprise one or more alcohols.
- the one or more fermentation end-products comprise ethanol.
- a yield of one or more other products is decreased relative to fermentation of the one or more monosaccharides without the first biomass. In some embodiments, a yield of one or more other products is decreased by about 1% to about 100% relative to fermentation of the one or more
- the one or more other products comprise one or more polyols or sugar alcohols. In some embodiments, the one or more other products comprise methanol, glycol, glycerol, erythritol, threitol, arabitol, xylitol, ribitol, mannitol, sorbitol, dulcitol, fucitol, iditol, inositol, volemitol, isomalt, maltitol, lactitol, polyglycitol, or a combination thereof.
- the one or more other products comprise glycerol
- the first biomass comprises non-cellulosic sugars.
- the first biomass comprises non-cellulosic oligosaccharides.
- the first biomass comprises starch.
- the first biomass comprises corn or corn mash, sugar cane, sugar beet, sugar palm, sweet sorghum, nypa palm, cassava, rice, milo, sorghum, sweet potato, wheat, molasses, or a combination thereof.
- the one or more monosaccharides are produced from the pretreatment and/or hydrolysis of cellulose, hemicellulose, or lignocellulose material.
- the one or more monosaccharides are a C6-enriched hydrolysate produced by the pretreatment and/or hydrolysis of a second biomass comprising cellulose, hemicellulose, or lignocellulose.
- the second biomass comprises corn, corn syrup, corn stover, corn cobs, molasses, silage, grass, straw, grain hulls, bagasse, distiller's grains, distiller's dried solubles, distiller's dried grains, condensed distiller's solubles, distiller's wet grains, distiller's dried grains with solubles, wood, bark, sawdust, paper, poplars, willows, switchgrass, alfalfa, prairie bluestem, algae, fruit peels, pits, sorghum, sweet sorghum, sugar cane, switch grass, rice, rice straw, rice hulls, wheat, wheat straw, barley, barley straw, bamboo, seeds, seed hulls, oats, oat hulls,
- monosaccharides are at a concentration that differs from a concentration of sugars in the first biomass by less than about +/- 50%, wherein the concentration of sugars in the first biomass assumes complete hydrolysis to monomers. In some embodiments, the one or more monosaccharides are at a concentration that differs from a concentration of sugars in the first biomass by less than about +/- 40%, wherein the concentration of sugars in the first biomass assumes complete hydrolysis to monomers. In some embodiments, the one or more monosaccharides are at a concentration that differs from a concentration of sugars in the first biomass by less than about +/- 30%, wherein the concentration of sugars in the first biomass assumes complete hydrolysis to monomers.
- the one or more monosaccharides are at a concentration that differs from a concentration of sugars in the first biomass by less than about +/- 20%, wherein the concentration of sugars in the first biomass assumes complete hydrolysis to monomers. In some embodiments, the one or more monosaccharides are at a concentration that differs from a concentration of sugars in the first biomass by less than about +/- 15%, wherein the concentration of sugars in the first biomass assumes complete hydrolysis to monomers. In some embodiments, the one or more monosaccharides are at a concentration that differs from a concentration of sugars in the first biomass by less than about +/- 10%, wherein the concentration of sugars in the first biomass assumes complete hydrolysis to monomers.
- the one or more monosaccharides comprises less than about 50%> C5 sugars. In some embodiments, the one or more monosaccharides comprises less than about 40%> C5 sugars. In some embodiments, the one or more monosaccharides comprises less than about 30%> C5 sugars. In some embodiments,
- the one or more monosaccharides comprises less than about 20%> C5 sugars. In some embodiments, the one or more monosaccharides comprises less than about 10% C5 sugars. In some embodiments, the one or more monosaccharides comprises from about 0.1% to about 10% C5 sugars. In some embodiments, at least one of the one or more biocatalysts is a fermenting microorganism. In some embodiments, at least one of the one or more biocatalysts is a hydro lytic enzyme. In some embodiments, the one or more biocatalysts comprise at least one fermenting microorganism and at least one hydrolytic enzyme.
- the blended feedstock comprises less than about 100 g/L monosaccharides prior to contacting with the one or more biocatalysts. In some embodiments, the blended feedstock comprises from about 1 g/L to about 100 g/L monosaccharides prior to contacting with the one or more biocatalysts. In some embodiments, the first biomass and the one or more sugars are combined in a ratio of from about 50:50 to 99: 1 by volume or by
- the first biomass and the one or more sugars are combined in a ratio of about 80:20 by volume or by weigh volume. In some embodiments, the first biomass and the one or more sugars are combined in a ratio of about 90: 10 by volume or by weigh volume.
- the one or more biocatalysts comprise one or more yeast strains, one or more bacterial strains, or a combination thereof. In some embodiments, the one or more biocatalysts comprise Saccharomyces cerevisiae.
- the one or more biocatalysts comprise an endoglucanase, an exoglucanase, a cellobiohydrolase, a cellulase, a beta-glucosidase, a glycoside hydrolase, a
- glycosyltransferase a lyase, an esterase, a glucamylase, or a combination thereof.
- Also provided herein are methods of producing one or more fermentation end- products comprising: (a) combining a first biomass with a C6-enriched hydro lysate to produce a blended feedstock; (b) contacting the blended feedstock with one or more hydro lytic enzymes and/or one or more fermenting microorganisms; and (c) fermenting the first biomass and the C6-enriched hydro lysate for a time sufficient to produce one or more fermentation end-products from the blended feedstock.
- the C6- enriched hydrolysate comprises monosaccharides produced from the pretreatment and/or hydrolysis of a second biomass.
- a yield of at least one of the one or more fermentation end-products is increased relative to fermentation of the first biomass without the C6-enriched hydrolysate. In some embodiments, a yield of at least one of the one or more fermentation end-products is increased by about 1% to about 100% relative to fermentation of the first biomass without the C6-enriched hydrolysate. In some embodiments, a rate of production for at least one of the one or more fermentation end-products is increased relative to fermentation of the first biomass without the C6-enriched hydrolysate. In some embodiments, a rate of production for at least one of the one or more fermentation end- products is increased by about 1% to about 100% relative to fermentation of the first biomass without the C6-enriched hydrolysate.
- the one or more fermentation end-products comprise one or more alcohols. In some embodiments, the one or more fermentation end-products comprise ethanol. In some embodiments, a yield of one or more other products is decreased relative to fermentation of the C6-enriched hydrolysate without the first biomass. In some embodiments, a yield of one or more other products is decreased by about 1% to about 100% relative to fermentation of the C6-enriched hydro lysate without the first biomass. In some embodiments, the one or more other products comprise one or more polyols or sugar alcohols.
- the one or more other products comprise methanol, glycol, glycerol, erythritol, threitol, arabitol, xylitol, ribitol, mannitol, sorbitol, dulcitol, fucitol, iditol, inositol, volemitol, isomalt, maltitol, lactitol, polyglycitol, or a combination thereof.
- the one or more other products comprise glycerol.
- the first biomass comprises non-cellulosic sugars.
- the first biomass comprises non-cellulosic oligosaccharides.
- the first biomass comprises starch.
- the first biomass comprises corn or corn mash, sugar cane, sugar beet, sugar palm, sweet sorghum, nypa palm, cassava, rice, milo, sorghum, sweet potato, wheat, molasses, or a combination thereof.
- the second biomass comprises cellulose, hemicellulose, or
- the second biomass comprises corn, corn syrup, corn stover, corn cobs, molasses, silage, grass, straw, grain hulls, bagasse, distiller's grains, distiller's dried solubles, distiller's dried grains, condensed distiller's solubles, distiller's wet grains, distiller's dried grains with solubles, wood, bark, sawdust, paper, poplars, willows, switchgrass, alfalfa, prairie bluestem, algae, fruit peels, pits, sorghum, sweet sorghum, sugar cane, switch grass, rice, rice straw, rice hulls, wheat, wheat straw, barley, barley straw, bamboo, seeds, seed hulls, oats, oat hulls, food waste, municipal sewage waste, or a combination thereof.
- the C6-enriched hydro lysate comprises monosaccharides at a concentration that differs from a concentration of sugars in the first biomass by less than about +/- 50%, wherein the concentration of sugars in the first biomass assumes complete hydrolysis to monomers. In some embodiments, the C6-enriched hydro lysate comprises monosaccharides at a concentration that differs from a concentration of sugars in the first biomass by less than about +/- 40%, wherein the concentration of sugars in the first biomass assumes complete hydrolysis to monomers.
- the C6-enriched hydrolysate comprises monosaccharides at a concentration that differs from a concentration of sugars in the first biomass by less than about +/- 30%, wherein the concentration of sugars in the first biomass assumes complete hydrolysis to monomers. In some embodiments, the C6-enriched hydrolysate comprises monosaccharides at a concentration that differs from a concentration of sugars in the first biomass by less than about +/- 20%, wherein the concentration of sugars in the first biomass assumes complete hydrolysis to monomers.
- the C6-enriched hydrolysate comprises monosaccharides at a concentration that differs from a concentration of sugars in the first biomass by less than about +/- 15%, wherein the concentration of sugars in the first biomass assumes complete hydrolysis to monomers. In some embodiments, the C6-enriched hydro lysate comprises monosaccharides at a concentration that differs from a concentration of sugars in the first biomass by less than about +/- 10%, wherein the concentration of sugars in the first biomass assumes complete hydrolysis to monomers. In some embodiments, the C6-enriched hydrolysate comprises less than about 50%> C5 sugars. In some embodiments, the C6-enriched hydrolysate comprises less than about 40% C5 sugars. In some embodiments,
- the C6-enriched hydrolysate comprises less than about 30%> C5 sugars. In some embodiments, the C6-enriched hydrolysate comprises less than about 20% C5 sugars. In some embodiments, the C6-enriched hydrolysate comprises less than about 10%> C5 sugars. In some embodiments, the C6-enriched hydrolysate comprises from about 0.1%> to about 10% C5 sugars.
- the one or more fermenting microorganisms comprise one or more yeast strains, one or more bacterial strains, or a combination thereof. In some embodiments, at least one of the one or more fermenting microorganisms is
- the one or more hydrolytic enzymes comprise an endoglucanase, an exoglucanase, a cellobiohydrolase, a cellulase, a beta- glucosidase, a glycoside hydrolase, a glycosyltransferase, a lyase, an esterase, a glucamylase, or a combination thereof.
- the blended feedstock comprises less than about 100 g/L monosaccharides prior to contacting with the one or more fermenting microorganisms and the one or more hydrolytic enzymes.
- the blended feedstock comprises from about 1 g/L to about 100 g/L monosaccharides prior to contacting with the one or more fermenting microorganisms and the one or more hydrolytic enzymes.
- the first biomass and the C6-enriched hydrolysate are combined in a ratio of from about 50:50 to 99: 1 by volume or by weigh volume.
- the first biomass and the C6-enriched hydrolysate are combined in a ratio of about 80:20 by volume or by weigh volume.
- the first biomass and the C6-enriched hydrolysate are combined in a ratio of about 90: 10 by volume or by weigh volume.
- a C6-enriched hydrolysate comprising: (a) treating a biomass comprising cellulose and hemicellulose and/or lignin to solubilize the hemicellulose and/or lignin; (b) separating the solubilized
- the biomass comprising cellulose and hemicellulose and/or lignin comprises corn, corn syrup, corn stover, corn cobs, molasses, silage, grass, straw, grain hulls, bagasse, distiller's grains, distiller's dried solubles, distiller's dried grains, condensed distiller's solubles, distiller's wet grains, distiller's dried grains with solubles, wood, bark, sawdust, paper, poplars, willows, switchgrass, alfalfa, prairie bluestem, algae, fruit peels, pits, sorghum, sweet sorghum, sugar cane, switch grass, rice, rice straw, rice hulls, wheat, wheat straw, barley, barley straw, bamboo, seeds, seed hulls, oats, oat hulls, food
- the biomass comprises corn stover.
- the treating comprises stream treatment, hot water treatment, dilute acid treatment, dilute base treatment, steam explosion, acid-catalyzed steam explosion, or a combination thereof.
- the treatment comprises steam treatment.
- the treating is performed at a temperature of from about 175 to about 250 °C. In some embodiments, the treating is performed at a temperature of about 205 °C. In some embodiments, the treating is performed from about 1 minute to about 30 minutes. In some embodiments, the treating is performed for about 7.5 minutes.
- the separating is performed using a filter press. In some embodiments, the separating step comprises washing the biomass with water.
- the water is from about 25 to about 100 °C. In some embodiments, the water is about 50 °C. In some embodiments, the water is added in an amount from about 1 to about 5 L/kg of biomass (dry weight). In some embodiments, the water is added in an amount of about 3 L/kg of biomass (dry weight).
- the hydrolyzing step comprises enzymatic hydrolysis with one or more enzymes. In some embodiments, the hydrolyzing step is performed at a pH of from about 3 to about 7. In some embodiments, the hydrolyzing step is performed at a pH of about 5. In some embodiments, the hydrolyzing step is performed in a slurry of from about 1 % to about 20% wt/wt biomass/water.
- the hydrolyzing step is performed in a slurry of about 8% wt/wt biomass/water. In some embodiments, the hydrolyzing step is performed in a jacketed reactor. Some embodiments further comprise concentrating the C6-enriched hydro lysate. In some embodiments, the C6-enriched hydro lysate is concentrated by evaporation. In some embodiments, the C6-enriched hydro lysate is concentrated using a roto- evaporator. In some embodiments, the C6-enriched hydro lysate is concentrated to a C6 sugar concentration of from about 100 g/L to about 500 g/L.
- the C6- enriched hydrolysate is concentrated to a C6 sugar concentration of about 300 g/L. In some embodiments, the C6-enriched hydrolysate comprises less than about 50% C5 sugars. In some embodiments, the C6-enriched hydrolysate comprises less than about 40%> C5 sugars. In some embodiments, the C6-enriched hydrolysate comprises less than about 30%> C5 sugars. In some embodiments, the C6-enriched hydrolysate comprises less than about 20% C5 sugars. In some embodiments, the C6-enriched hydrolysate comprises less than about 10% C5 sugars. In some embodiments, the C6-enriched hydrolysate comprises from about 0.1% to about 10% C5 sugars.
- C6-enriched hydro lysates produced by any of the methods disclosed herein.
- Also provided are methods of producing ethanol comprising: (a) combining a first biomass comprising starch with a C6-enriched hydrolysate to produce a blended feedstock, (i) wherein the C6-enriched hydrolysate comprises monosaccharides produced from the pretreatment and/or hydrolysis of a second biomass, (ii) wherein the C6- enriched hydrolysate comprises monosaccharides at a concentration that differs from a concentration of sugars in the first biomass by less than about +/- 20%, wherein the concentration of sugars in the first biomass assumes complete hydrolysis to monomers, and (iii) wherein the blended feedstock comprises from about 1 g/L to about 100 g/L
- Figure 1 is a graph illustrating the trajectory of how biomass is converted from solids into liquefied C6 sugars during hydrolysis using cellulase enzymes.
- Figure 2 is a graph illustrating the improvement in ethanol yield for fermentation of corn mash slurry spiked with various energy sorghum-derived sugar blends as compared to fermentation of corn mash slurry alone.
- Figure 3 is a graph of glucose concentration over time for a corn mash control feedstock as compared to a feedstock spiked with sugar from energy sorghum.
- Figure 4 is a graph comparing ethanol production for a corn mash control against corn mash spiked with energy sorghum sugars.
- Figure 5 is a graph illustrating the improvement in ethanol yield for a corn mash slurry spiked with switchgrass-derived sugar as compared to corn mash slurry alone.
- Figure 6 is a graph comparing glucose uptake for a glucose control as compared to a glucose solution spiked with energy sorghum solids and a glucose solution spiked with switchgrass solids.
- Figure 7 is a graph comparing ethanol production for a glucose control as compared to a glucose solution spiked with energy sorghum solids and a glucose solution spiked with switchgrass solids.
- Figure 8 is a graph comparing ethanol production from corn mash to ethanol production from a fed batch fermentation of a 90: 10 blend of corn mash and cellulosic sugar with C5 fermenting yeast.
- Figure 9 is a graph comparing ethanol production from corn mash to ethanol production from a fed-batch fermentation of a 90: 10 blend of corn mash and wheat straw cellulosic sugar at shake flask level.
- Figure 10 is a graph comparing ethanol production from corn mash to ethanol production from a fed batch fermentation of a 90: 10 blend of corn mash and cellulosic sugar with a C5 fermenting yeast.
- Figure 11 is a graph showing the increase in ethanol production in fed-batch fermentations compared to batch fermentations after 72 hours using a 90: 10 and a 80:20 blend of corn mash and cellulosic sugars.
- Figure 12 are progress curves showing mass loss (g) over time during fermentation of corn mash supplemented with varying levels of a C6 Saccharide Stream produced from corn stillage.
- the treatment IDs in the figure legends correspond to Table 9.
- Figure 13 is a chart showing the average mass loss due to carbon dioxide after fermentation of corn mash supplemented with varying levels of a C6 Saccharide Stream produced from corn stillage for 15.67 (dark grey bars) and 62 hours (light grey bars). Bars labeled with the same letter are not statistically different from one another at either 15.67 or 62 hours. Error bars represent one standard deviation of nine independent replicate fermentation flasks at 15.67 hours and three independent replicate fermentation flasks at 62 hours. The treatment IDs in the figure legend corresponds to Table 9.
- Figure 14 is a comparison of the average final concentrations of ethanol (left bars) and unfermented sugars as glucose equivalent (right bars) after fermentation of corn mash dosed with varying levels of a C6 Saccharide Stream produced from corn stillage for 62 hours as measured by HPLC. Error bars represent one standard deviation of three
- Figure 15 is a dose-response graph, representing the dose of C6 Saccharide Stream produced from corn stillage versus glycerol concentration accumulated for all treatments identified in Table 9.
- the dashed lines represent the QC glycerol concentration. Error bars represent one standard deviation of three independent replicate fermentation flasks, except for QC which represents the standard deviation of six independent replicate flasks.
- Figure 16 shows the average final pH values after fermentation of corn mash dosed with varying levels of a C6 Saccharide Stream produced from corn stillage for 22 hours (diamonds), 46 hours (squares) and 62 hours (triangles).
- Figure 17 shows the average improvement in ethanol yield for corn mash
- Figure 18 shows the average increase in ethanol yield (squares; left Y-axis) and residual sugars (triangles; right Y-axis) after fermentation of corn mash dosed with varying levels of a C6 Saccharide Stream produced from corn stillage.
- Figure 19 shows the average mass loss for fermentations of 80:20 blends of corn mass and a C6 Saccharide Stream produced from corn stover (squares) or stock sugar (diamonds).
- Figure 20 shows the average mass loss for fermentations of 80:20 blends of corn mass and a C6 Saccharide Stream produced from corn stover (squares) or stock sugar (diamonds).
- Figure 21 shows the shows the ethanol production rate kinetics throughout fermentation a 70:30 blend of corn mash and C6 Saccharide Stream (cellulosic-derived) (square) compared to corn mash alone (diamond).
- Figure 22 shows the shows the glycerol production rate kinetics throughout fermentation a 70:30 blend of corn mash and C6 Saccharide Stream (cellulosic-derived) (square) compared to corn mash alone (diamond).
- the phrase "the medium can optionally contain glucose” means that the medium may or may not contain glucose as an ingredient and that the description includes both media containing glucose and media not containing glucose.
- Fermentive end-product and “fermentation end-product” are used interchangeably herein to include bio fuels, chemicals, compounds suitable as liquid fuels, gaseous fuels, triacylglycerols (TAGs), reagents, chemical feedstocks, chemical additives, processing aids, food additives, bioplastiks and precursors to bioplastiks, and other products.
- TAGs triacylglycerols
- fermentive end-products include but are not limited to 1,4 diacids (succinic, fumaric and malic), 2,5 furan dicarboxylic acid, 3 hydroxy propionic acid, aspartic acid, glucaric acid, glutamic acid, itaconic acid, levulinic acid, 3-hydroxybutyrolactone, glycerol, sorbitol, xylitol/arabinitol, butanediol, butanol, methane, methanol, ethane, ethene, ethanol, n-propane, 1-propene, 1-propanol, propanal, acetone, propionate, n-butane, 1-butene, 1 -butanol, butanal, butanoate, isobutanal, isobutanol, 2-methylbutanal, 2-methylbutanol, 3-methylbutanal, 3- methylbutanol, 2-butene, 2-butan
- phenylacetoaldehyde 1 ,4-diphenylbutane, 1,4-diphenyl-l-butene, 1 ,4-diphenyl-2-butene, 1,4- diphenyl-2-butanol, 1 ,4-diphenyl-2-butanone, l,4-diphenyl-2,3-butanediol, l,4-diphenyl-3- hydroxy-2-butanone, 1 -(4-hydeoxyphenyl)-4-phenylbutane, 1 -(4-hydeoxyphenyl)-4-phenyl- 1 -butene, 1 -(4-hydeoxyphenyl)-4-phenyl-2-butene, 1 -(4-hydeoxyphenyl)-4-phenyl-2-butene, 1 -(4-hydeoxyphenyl)-4-phenyl-2-butanol, 1 -(4-h
- Such products can include succinic acid, pyruvic acid, enzymes such as cellulases, polysaccharases, lipases, proteases, ligninases, and hemicellulases and may be present as a pure compound, a mixture, or an impure or diluted form.
- enzymes such as cellulases, polysaccharases, lipases, proteases, ligninases, and hemicellulases and may be present as a pure compound, a mixture, or an impure or diluted form.
- Fermentation end-products can include polyols or sugar alcohols; for example, methanol, glycol, glycerol, erythritol, threitol, arabitol, xylitol, ribitol, mannitol, sorbitol, dulcitol, fucitol, iditol, inositol, volemitol, isomalt, maltitol, lactitol, and/or polyglycitol.
- polyols or sugar alcohols for example, methanol, glycol, glycerol, erythritol, threitol, arabitol, xylitol, ribitol, mannitol, sorbitol, dulcitol, fucitol, iditol, inositol, volemitol, isomalt, maltitol, lacti
- fatty acid comprising material has its ordinary meaning as known to those skilled in the art and can comprise one or more chemical compounds that include one or more fatty acid moieties as well as derivatives of these compounds and materials that comprise one or more of these compounds.
- Common examples of compounds that include one or more fatty acid moieties include triacylglycerides, diacylglycerides, monoacylglycerides, phospholipids, lysophospho lipids, free fatty acids, fatty acid salts, soaps, fatty acid comprising amides, esters of fatty acids and monohydric alcohols, esters of fatty acids and polyhydric alcohols including glycols (e.g.
- a fatty acid comprising material can be one or more of these compounds in an isolated or purified form. It can be a material that includes one or more of these compounds that is combined or blended with other similar or different materials.
- Solid forms include whole forms, such as cells, beans, and seeds; ground, chopped, slurried, extracted, flaked, milled, etc.
- the fatty acid portion of the fatty acid comprising compound can be a simple fatty acid, such as one that includes a carboxyl group attached to a substituted or un- substituted alkyl group.
- the substituted or unsubstituted alkyl group can be straight or branched, saturated or unsaturated. Substitutions on the alkyl group can include hydroxyls, phosphates, halogens, alkoxy, or aryl groups.
- the substituted or unsubstituted alkyl group can have 7 to 29 carbons and preferably 1 1 to 23 carbons (e.g., 8 to 30 carbons and preferably 12 to 24 carbons counting the carboxyl group) arranged in a linear chain with or without side chains and/or substitutions.
- Addition of the fatty acid comprising compound can be by way of adding a material comprising the fatty acid comprising compound.
- pH modifier has its ordinary meaning as known to those skilled in the art and can include any material that will tend to increase, decrease or hold steady the pH of the broth or medium.
- a pH modifier can be an acid, a base, a buffer, or a material that reacts with other materials present to serve to raise, lower, or hold steady the pH.
- more than one pH modifier can be used, such as more than one acid, more than one base, one or more acid with one or more bases, one or more acids with one or more buffers, one or more bases with one or more buffers, or one or more acids with one or more bases with one or more buffers.
- a buffer can be produced in the broth or medium or separately and used as an ingredient by at least partially reacting in acid or base with a base or an acid, respectively.
- pH modifiers When more than one pH modifiers are utilized, they can be added at the same time or at different times.
- one or more acids and one or more bases are combined, resulting in a buffer.
- media components such as a carbon source or a nitrogen source serve as a pH modifier; suitable media components include those with high or low pH or those with buffering capacity.
- Exemplary media components include acid- or base-hydrolyzed plant polysaccharides having residual acid or base, ammonia fiber explosion (AFEX) treated plant material with residual ammonia, lactic acid, corn steep solids or liquor.
- AFEX ammonia fiber explosion
- “Growth phase” is used herein to describe the type of cellular growth that occurs after the “Initiation phase” and before the “Stationary phase” and the “Death phase.”
- the growth phase is sometimes referred to as the exponential phase or log phase or logarithmic phase.
- plant polysaccharide as used herein has its ordinary meaning as known to those skilled in the art and can comprise one or more polymers of sugars and sugar derivatives as well as derivatives of sugar polymers and/or other polymeric materials that occur in plant matter.
- Exemplary plant polysaccharides include lignin, cellulose, starch, pectin, and hemicellulose. Others are chitin, sulfonated polysaccharides such as alginic acid, agarose, carrageenan, porphyran, furcelleran and funoran.
- the polysaccharide can have two or more sugar units or derivatives of sugar units.
- the sugar units and/or derivatives of sugar units can repeat in a regular pattern, or otherwise.
- the sugar units can be hexose units or pentose units, or combinations of these.
- the derivatives of sugar units can be sugar alcohols, sugar acids, amino sugars, etc.
- the polysaccharides can be linear, branched, cross- linked, or a mixture thereof.
- One type or class of polysaccharide can be cross-linked to another type or class of polysaccharide.
- the concentration of saccharides in a biomass containing plant polysaccharides such as cellulose, hemicellulose, starch, or pectin can be given in terms of monosaccharide equivalents.
- a monosaccharide equivalent concentration is the concentration of saccharides assuming complete hydrolysis of polysaccharides to monosaccharides.
- sacharification has its ordinary meaning as known to those skilled in the art and can include conversion of plant polysaccharides to lower molecular weight species that can be utilized by the organism at hand. For some organisms, this would include conversion to monosaccharides, disaccharides, trisaccharides, and oligosaccharides of up to about seven monomer units, as well as similar sized chains of sugar derivatives and combinations of sugars and sugar derivatives.
- SSF and "SHF” are known to those skilled in the art; SSF meaning simultaneous saccharification and fermentation, or the conversion from polysaccharides or oligosaccharides into monosaccharides at the same time and in the same fermentation vessel wherein monosaccharides are converted to another chemical product such as ethanol.
- SHF indicates a physical separation of the polymer hydrolysis or saccharification and fermentation processes.
- biomass as used herein has its ordinary meaning as known to those skilled in the art and can include one or more biological materials that can be converted into a bio fuel, chemical or other product.
- Biomass as used herein is synonymous with the term “feedstock” and includes corn syrup, molasses, silage, agricultural residues (corn stalks, grass, straw, grain hulls, bagasse, etc.), animal waste (manure from cattle, poultry, and hogs), Distillers Dried Solubles (DDS), Distillers Dried Grains (DDG), Condensed Distillers Solubles (CDS), Distillers Wet Grains (DWG), Distillers Dried Grains with Solubles
- biomass woody materials (wood or bark, sawdust, timber slash, and mill scrap), municipal waste (waste paper, recycled toilet papers, yard clippings, etc.), and energy crops (poplars, willows, switchgrass, alfalfa, prairie bluestem, algae, including macroalgae, etc.).
- One exemplary source of biomass is plant matter.
- Plant matter can be, for example, woody plant matter, non-woody plant matter, cellulosic material, lignocellulosic material, hemicellulosic material, carbohydrates, pectin, starch, inulin, fructans, glucans, corn, sugar cane, grasses, switchgrass, sorghum, high biomass sorghum, bamboo, algae and material derived from these. Plants can be in their natural state or genetically modified, e.g., to increase the cellulosic or hemicellulosic portion of the cell wall, or to produce additional exogenous or endogenous enzymes to increase the separation of cell wall components. Plant matter can also include plant cell culture or plant cell tissue culture.
- Plant matter can be further described by reference to the chemical species present, such as proteins, polysaccharides and oils.
- Polysaccharides include polymers of various monosaccharides and derivatives of monosaccharides including glucose, fructose, lactose, galacturonic acid, rhamnose, etc.
- Plant matter also includes agricultural waste byproducts or side streams such as pomace, corn steep liquor, corn steep solids, distillers grains, peels, pits, fermentation waste, straw, lumber, sewage, garbage and food leftovers.
- Peels can be citrus which include, but are not limited to, tangerine peel, grapefruit peel, orange peel, tangerine peel, lime peel and lemon peel. These materials can come from farms, forestry, industrial sources, households, etc.
- Another non- limiting example of biomass is animal matter, including, for example milk, meat, fat, animal processing waste, and animal waste. "Feedstock” is frequently used to refer to biomass being used for a process, such as those described herein.
- Broth is used herein to refer to inoculated medium at any stage of growth, including the point immediately after inoculation and the period after any or all cellular activity has ceased and can include the material after post-fermentation processing. It includes the entire contents of the combination of soluble and insoluble matter, suspended matter, cells and medium, as appropriate.
- productivity has its ordinary meaning as known to those skilled in the art and can include the mass of a material of interest produced in a given time in a given volume. Units can be, for example, grams per liter-hour, or some other combination of mass, volume, and time. Zrc/ermentation, productivity is frequently used to characterize how fast a product can be made within a given fermentation volume.
- the volume can be referenced to the total volume of the fermentation vessel, the working volume of the fermentation vessel, or the actual volume of broth being fermented. The context of the phrase will indicate the meaning intended to one of skill in the art.
- Productivity is different from "titer" in that productivity includes a time term, and titer is analogous to concentration.
- Titer and Productivity can generally be measured at any time during the fermentation, such as at the beginning, the end, or at some intermediate time, with titer relating the amount of a particular material present or produced at the point in time of interest and the productivity relating the amount of a particular material produced per liter in a given amount of time.
- the amount of time used in the productivity determination can be from the beginning of the fermentation or from some other time, and go to the end of the fermentation, such as when no additional material is produced or when harvest occurs, or some other time as indicated by the context of the use of the term.
- “Overall productivity” refers to the productivity determined by utilizing the final titer and the overall fermentation time.
- Tier refers to the amount of a particular material present in a fermentation broth. It is similar to concentration and can refer to the amount of material made by the organism in the broth from all fermentation cycles, or the amount of material made in the current fermentation cycle or over a given period of time, or the amount of material present from whatever source, such as produced by the organism or added to the broth.
- the titer of soluble species will be referenced to the liquid portion of the broth, with insolubles removed, and the titer of insoluble species will be referenced to the total amount of broth with insoluble species being present, however, the titer of soluble species can be referenced to the total broth volume and the titer of insoluble species can be referenced to the liquid portion, with the context indicating the which system is used with both reference systems intended in some cases.
- the value determined referenced to one system will be the same or a sufficient approximation of the value referenced to the other.
- Concentration when referring to material in the broth generally refers to the amount of a material present from all sources, whether made by the organism or added to the broth. Concentration can refer to soluble species or insoluble species, and is referenced to either the liquid portion of the broth or the total volume of the broth, as for "titer.”
- biocatalyst as used herein has its ordinary meaning as known to those skilled in the art and can include one or more enzymes and/or microorganisms, including solutions, suspensions, and mixtures of enzymes and microorganisms. In some contexts this word will refer to the possible use of either enzymes or microorganisms to serve a particular function, in other contexts the word will refer to the combined use of the two, and in other contexts the word will refer to only one of the two. The context of the phrase will indicate the meaning intended to one of skill in the art.
- a biocatalyst can be a fermenting microorganism.
- biocatalyst includes fermenting microorganisms such as yeast, bacteria, or algae.
- conversion efficiency or “yield” as used herein have their ordinary meaning as known to those skilled in the art and can include the mass of product made from a mass of substrate. The term can be expressed as a percentage yield of the product from a starting mass of substrate. For the production of ethanol from glucose, the net reaction is generally accepted as:
- Pretreatment or “pretreated” is used herein to refer to any mechanical, chemical, thermal, biochemical process or combination of these processes whether in a combined step or performed sequentially, that achieves disruption or expansion of the biomass so as to render the biomass more susceptible to attack by enzymes and/or microbes.
- pretreatment includes removal or disruption of lignin so as to make the cellulose and hemicellulose polymers in the plant biomass more available to cellulolytic enzymes and/or microbes, for example, by treatment with acid or base.
- pretreatment includes disruption or expansion of cellulosic and/or hemicellulosic material.
- Steam explosion, and ammonia fiber expansion (or explosion) (AFEX) are well known thermal/chemical techniques. Hydrolysis, including methods that utilize acids, bases, and/or enzymes can be used. Other thermal, chemical, biochemical, enzymatic techniques can also be used.
- Feed-batch or “fed-batch fermentation” is used herein to include methods of culturing microorganisms where nutrients, other medium components, or biocatalysts (including, for example, enzymes, fresh organisms, extracellular broth, genetically modified plants and/or organisms, etc.) are supplied to the fermentor during cultivation, but culture broth is not harvested from the fermentor until the end of the fermentation, although it can also include "self seeding” or "partial harvest” techniques where a portion of the fermentor volume is harvested and then fresh medium is added to the remaining broth in the fermentor, with at least a portion of the inoculum being the broth that was left in the fermentor.
- nutrients, other medium components, or biocatalysts including, for example, enzymes, fresh organisms, extracellular broth, genetically modified plants and/or organisms, etc.
- the broth volume can increase, at least for a period, by adding medium or nutrients to the broth while fermentation organisms are present.
- Suitable nutrients which can be utilized include those that are soluble, insoluble, and partially soluble, including gasses, liquids and solids.
- a fed-batch process is referred to with a phrase such as, "fed-batch with cell augmentation.” This phrase can include an operation where nutrients and cells are added or one where cells with no substantial amount of nutrients are added. The more general phrase "fed-batch" encompasses these operations as well. The context where any of these phrases is used will indicate to one of skill in the art the techniques being considered.
- “Sugar compounds” or “sugar streams” is used herein to indicate mostly monosaccharide sugars, dissolved, crystallized, evaporated, or partially dissolved, including but not limited to hexoses and pentoses; sugar alcohols; sugar acids; sugar amines;
- a sugar stream can consist of primarily or substantially C6 sugars (e.g., a C6-rich stream), C5 sugars (e.g., a C5-rich stream), or mixtures of both C6 and C5 sugars in varying ratios of said sugars.
- C6 sugars have a six-carbon molecular backbone and C5 sugars have a five-carbon molecular backbone.
- Sugar compounds or sugar streams can be produced from the pretreatment and/or hydrolysis of biomass.
- the biomass can comprise cellulose, hemicellulose, hgnocellulose, starch, or a combination thereof.
- Sugars or sugar streams produced from cellulose, hemicellulose, and/or hgnocellulose can be termed "cellulo sic-derived saccharides”.
- Sugars or sugar streams produced from starch can be termed "non-cellulosic-derived saccharides" or “non-cellulosic derived saccharide streams.
- C5-rich composition means that one or more steps have been taken to remove at least some of the C6 sugars originally in the composition.
- a C5-rich composition means that one or more steps have been taken to remove at least some of the C6 sugars originally in the composition.
- composition can include no more than about 50% C6 sugars, no more than about 40% C6 sugars, no more than about 30%> C6 sugars, no more than about 20%> C6 sugars, no more than about 10%) C6 sugars, no more than about 5% C6 sugars, or it can include from about 2% to about 10%) C6 sugars by weight.
- a "C6-rich" composition is one in which at least some of the originally-present C5 sugars have been removed.
- a C6-rich composition can include no more than about 50% C5 sugars, nor more than about 40% C5 sugars, no more than about 30%> C5 sugars, no more than about 20%> C5 sugars, no more than about 10%) C5 sugars, no more than about 5% C5 sugars, or it can include from about 2% to about 10%) C5 sugars by weight.
- a “liquid” composition may contain solids and a “solids” composition may contain liquids.
- a liquid composition refers to a composition in which the material is primarily liquid, and a solids composition is one in which the material is primarily solid.
- “Gentle Pretreatment” generally refers to the collection of processes upstream of hydrolysis, which result in composition that, when hydro lyzed, produces a fermentable sugar composition.
- the fermentable sugar composition can be used to enhance a non-cellulosic fermentation process, such as a corn mash fermentation process.
- the gentle pretreatment process provides a fermentable sugar composition having a favorable nutrient balance (e.g. plant-derived extracted nutrients, which are part of the composition as a result of the pretreatment process) and/or an amount of toxic compounds (e.g.
- a gentle pretreatment is one that results in a sugar stream that is about 25% (w/v) C6 sugars or more, about 4 g/L
- “About X amount of a substance or less” means the same as “no more than about” and includes zero— i.e. includes the possibility that none of that substance is present in the composition.)
- "Gentle pretreatment” can include one or more of: pre-processing biomass to reduce size and/or create size uniformity; pretreatment itself (process for making cellulose more accessible to hydrolysis); and post-processing steps such as washing steps.
- non-cellulosic and “sugar- or starch- based” are used interchangeably and have the same meaning.
- non-cellulosic fermentation process is used interchangeably and means the same thing as “sugar- and starch-based fermentation process.”
- Starch is a carbohydrate consisting of consisting of a large number of glucose units joined by glycosidic bonds. The glycosidic bonds are typically the easily hydro lysable alpha glycosidic bonds. This polysaccharide can be produced by all green plants as an energy store.
- amylopectin although amylase can also contain branches.
- a "first biomass” as used herein includes simple saccharides (e.g., mono and di- saccharides, e.g., glucose, sucrose, lactose, etc.) and/or starch-containing materials.
- a first biomass includes corn, corn mash, sugar cane, sugar beets, sugar palms, sweet sorghum, nypa palm, cassava, rice, milo, sorghum, sweet potatoes, wheat, molasses, tubers, roots, stems, whole grains, barley, rye, milo, sago, cassaya, tapioca, rice peas, beans, potatoes, beets, fruits, or any other sugar or starch containing materials, or combination of sugar or starch containing materials or sugar or starch containing biomasses.
- the term "simple saccharides and/or starch containing biomass” is also used interchangeably herein with a "first biomass.”
- the feedstock contains cellulosic, hemicellulosic, and/or lignocellulosic material.
- the feedstock can be derived from agricultural crops, crop residues, trees, woodchips, sawdust, paper, cardboard, grasses, algae, municipal waste and other sources.
- Cellulose is a linear polymer of glucose where the glucose units are connected via ⁇ (1 ⁇ 4) linkages.
- Hemicellulose is a branched polymer of a number of sugar monomers including glucose, xylose, mannose, galactose, rhamnose and arabinose, and can have sugar acids such as mannuronic acid and galacturonic acid present as well.
- Lignin is a cross-linked, racemic macromolecule of mostly /?-coumaryl alcohol, conferyl alcohol and sinapyl alcohol. These three polymers occur together in lignocellulosic materials in plant biomass. The different characteristics of the three polymers can make hydrolysis of the combination difficult as each polymer tends to shield the others from enzymatic attack.
- methods are provided for the pretreatment of feedstock used in the fermentation and production of the bio fuels and chemicals.
- the pretreatment steps can include mechanical, thermal, pressure, chemical, thermo chemical, and/or biochemical tests pretreatment prior to being used in a bioprocess for the production of fuels and chemicals, but untreated biomass material can be used in the process as well.
- Mechanical processes can reduce the particle size of the biomass material so that it can be more conveniently handled in the bioprocess and can increase the surface area of the feedstock to facilitate contact with chemicals/biochemicals/biocatalysts.
- Mechanical processes can also separate one type of biomass material from another.
- the biomass material can also be subjected to thermal and/or chemical pretreatments to render plant polymers more accessible. Multiple steps of treatment can also be used.
- Mechanical processes include, are not limited to, washing, soaking, milling, size reduction, screening, shearing, size classification and density classification processes.
- Chemical processes include, but are not limited to, bleaching, oxidation, reduction, acid treatment, base treatment, sulfite treatment, acid sulfite treatment, basic sulfite treatment, ammonia treatment, and hydrolysis.
- Thermal processes include, but are not limited to, sterilization, ammonia fiber expansion or explosion ("AFEX”), steam explosion, holding at elevated temperatures, pressurized or unpressurized, in the presence or absence of water, and freezing.
- Biochemical processes include, but are not limited to, treatment with enzymes, including enzymes produced by genetically-modified plants, and treatment with
- microorganisms Various enzymes that can be utilized include cellulase, amylase, ⁇ - glucosidase, xylanase, gluconase, and other polysaccharases; lysozyme; laccase, and other lignin-modifying enzymes; lipoxygenase, peroxidase, and other oxidative enzymes;
- proteases and lipases.
- One or more of the mechanical, chemical, thermal, thermo chemical, and biochemical processes can be combined or used separately. Such combined processes can also include those used in the production of paper, cellulose products, micro crystalline cellulose, and cellulosics and can include pulping, kraft pulping, acidic sulfite processing.
- the feedstock can be a side stream or waste stream from a facility that utilizes one or more of these processes on a biomass material, such as cellulosic, hemicellulosic or lignocellulosic material. Examples include paper plants, cellulosics plants, distillation plants, cotton processing plants, and micro crystalline cellulose plants.
- the feedstock can also include cellulose-containing or cellulosic containing waste materials.
- the feedstock can also be biomass materials, such as wood, grasses, corn, starch, or sugar, produced or harvested as an intended feedstock for production of ethanol or other products such as by biocatalysts.
- a method can utilize a pretreatment process disclosed in U.S. Patents and Patent Applications US20040152881, US20040171136, US20040168960, US20080121359, US20060069244, US20060188980, US20080176301, 5693296, 6262313, US20060024801, 5969189, 6043392, US20020038058, US5865898, US5865898, US6478965, 5986133, or US20080280338, each of which is incorporated by reference herein in its entirety.
- the AFEX process is be used for pretreatment of biomass.
- the AFEX process is used in the preparation of cellulosic, hemicellulosic or lignocellulosic materials for fermentation to ethanol or other products.
- the process generally includes combining the feedstock with ammonia, heating under pressure, and suddenly releasing the pressure. Water can be present in various amounts.
- the AFEX process has been the subject of numerous patents and publications.
- the pretreatment of biomass comprises the addition of calcium hydroxide to a biomass to render the biomass susceptible to degradation.
- Pretreatment comprises the addition of calcium hydroxide and water to the biomass to form a mixture, and maintaining the mixture at a relatively high temperature.
- an oxidizing agent selected from the group consisting of oxygen and oxygen-containing gasses, can be added under pressure to the mixture. Examples of carbon hydroxide treatments are disclosed in U.S. Patent No. 5865898 to Holtzapple and S. Kim and M. T. Holzapple, Bioresource Technology, 96, (2005) 1994, incorporated by reference herein in its entirety.
- pretreatment of biomass comprises dilute acid hydrolysis.
- Example of dilute acid hydrolysis treatment are disclosed in T. A. Lloyd and C. E Wyman, Bioresource Technology, (2005) 96, 1967, incorporated by reference herein in its entirety.
- pretreatment of biomass comprises pH controlled liquid hot water treatment.
- pH controlled liquid hot water treatments are disclosed in N. Mosier et ah, Bioresource Technology, (2005) 96, 1986, incorporated by reference herein in its entirety.
- pretreatment of biomass comprises aqueous ammonia recycle process (ARP).
- ARP aqueous ammonia recycle process
- the above mentioned methods have two steps: a pretreatment step that leads to a wash stream, and an enzymatic hydrolysis step of pretreated-biomass that produces a hydrolysate stream.
- the pretreatment step can include acid hydrolysis, hot water pretreatment, steam explosion or alkaline reagent based methods (AFEX, ARP, and lime pretreatments). Dilute acid and hot water treatment methods can be used to solubilize all or a portion of the hemicellulose. Methods employing alkaline reagents can be used remove all, most, or a portion of the lignin during the pretreatment step.
- the wash stream from the pretreatment step in the former methods contains mostly hemicellulose-based sugars, whereas this stream has mostly lignin for the high-pH methods.
- the subsequent enzymatic hydrolysis of the residual biomass leads to mixed sugars (C5 and C6) in the alkali based pretreatment methods, while glucose is the major product in the hydrolysate from the low and neutral pH methods.
- Such a hydrolysate can be referred to as a C6-enriched hydrolysate.
- the treated material is additionally treated with catalase or another similar chemical, chelating agents, surfactants, and other compounds to remove impurities or toxic chemicals or further release polysaccharides.
- one or more monosaccharides are produced by pretreating and/or hydro lyzing a biomass comprising cellulose, hemicellulose, lignocellulose and/or starch.
- the biomass can be pretreated according to any of the methods disclosed herein; for example, by dilute acid, hot water treatment, stream explosion, or an alkaline pretreatment.
- the biomass can be pretreated using a combination of techniques; for example, the biomass can be pretreated using hot water or stream explosion followed by alkaline treatment.
- the one or more monosaccharides can include C6 and/or C5 monosaccharides.
- the one or more monosaccharides can be in a C6-enriched hydrolysate (C6 Saccharide Stream).
- the one or more monosaccharides can be in a C5-enriched hydrolysate (C5 Saccharide Stream).
- the one or more monosaccharides can comprise both C5 and C6 saccharides (C5 + C6 Saccharide Stream).
- the one or more monosaccharides can include cellulosic-derived monosaccharides.
- the one or more monosaccharides can include non-cellulosic-derived monosaccharides (e.g., starch-derived monosaccharides).
- the one or more monosaccharides can include glucose, fructose, galactose, xylose, or any other saccharides.
- a C6-enriched hydrolysate (C6 Saccharide Stream) is enriched for C6 sugars
- the C6-enriched hydrolysate can comprise C5 sugars. In one embodiment, less than about 50%, 40%, 30%, 20%, 10%, or 1% of the sugars in the C6-enriched hydrolysate are C5 sugars. In another embodiment, about 0-50%, 0-40%, 0-30%, 0-20%, 0-10%, 0-1%, 0-0.1%, 0.1-50%, 0.1-40%, 0.1-30%, 0.1-20%, 0.1-10%, 0.1-1%, 1-50%, 1-40%, 1-30%, 1-20%, 1- 10%, 10-50%, 10-40%, 10-30%, 10-20%, 20-50%, 20-40%, 20-30%, 30-50%, 30-40%, of 40-50%) of the sugars in a C6-enriched hydrolysate are C5 sugars.
- the C6-enriched hydrolysate can comprise one or more cellulosic-derived C6 monosaccharides (e.g., glucose).
- the C6-enriched hydrolysate can comprise one
- monosaccharides e.g., starch-derived monosaccharides, e.g., glucose
- a hydrolyzate or saccharide stream comprising one or more cellulosic or non- cellulosic derived saccharides can further comprise residual solids (e.g., insoluble or suspended solids).
- the residual solids can include unhydrolyzed cellulose, hemicellulose, lignin, or starch; proteins; fats; oils, or a combination thereof.
- the hydro lyzate or sugar stream can comprise from about 0 % to about 50% w/v residual solids; for example, about 0- 50%, 0-25%, 0-15%, 0-10%, 0-5%, 0-1%, 1-50%, 1-25%, 1-15%, 1-10%, 1-5%, 5-50%, 5- 25%, 5-15%, 5-10%, 10-50%, 10-25%, 10-15%, 15-50%, 15-25%, 25-50%, 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%,
- Residual solids e.g., insoluble or suspended solids
- a hydro lyzate or saccharide stream e.g., C5 Saccharide Stream, C6 Saccharide Stream, C5 + C6 Saccharide Stream, etc.
- a hydro lyzate or saccharide stream can have, for example, particle sizes of from 10 ⁇ to 2.5 mm or larger or smaller.
- the residual solids can have particles sizes of about 0.01-2.5 mm, 0.01-1 mm, 0.01-0.5 mm, 0.01- 0.1 mm, 0.01-0.05 mm, 0.05-2.5 mm, 0.05-1 mm, 0.05-0.5 mm, 0.05-0.1 mm, 0.1-2.5 mm, 0.1-1 mm, 0.1-0.5 mm, 0.5-2.5 mm, 0.5-1 mm, 1-2.5 mm, 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65
- Residual solids e.g., insoluble or suspended solids
- a hydro lyzate or saccharide stream e.g., C5 Saccharide Stream, C6 Saccharide Stream, C5 + C6 Saccharide Stream, etc.
- the residual solids can have particles sizes of about 0.01-2.5 mm 3 , 0.01-1 mm 3 , 0.01-0.5 mm 3 , 0.01-0.1 mm 3 , 0.01-0.05 mm 3 , 0.05-2.5 mm 3 , 0.05-1 mm 3 , 0.05-0.5 mm 3 , 0.05-0.1 mm 3 , 0.1-
- all or a portion of the residual solids are sequestered and removed from a hydro lyzate or saccharide stream (e.g., C5 Saccharide Stream, C6 Saccharide Stream, C5 + C6 Saccharide Stream, etc.).
- the sequestration and removal can be accomplished, for example, by flocculation, filtration, evaporation, centrifugation, or a combination thereof.
- the level of residual solids (e.g., insoluble or suspended solids) in a hydrolyzate or saccharide stream can affect the rate and/or final titer of one or more fermentation end-products in a fermentation reaction.
- a hydrolyzate or saccharide stream e.g., C5 Saccharide Stream, C6 Saccharide Stream, C5 + C6 Saccharide Stream, etc.
- decreasing the level of residual solids can decrease the rate and/or final titer of polyols and/or sugar alcohols. Without being limited by theory, this can be due to decreased osmotic stress upon the microbial biocatalyst(s) used in the fermentation reaction.
- the level of residual solids (e.g., insoluble or suspended solids) in a hydrolyzate or saccharide stream can affect the growth rate of a biocatalyst microorganism in a fermentation reaction.
- the residual solids can contain nutrients (e.g., proteins, amino acids, fats, oils, etc.) or ions/trace metals that promote microorganism growth. Increased growth rates can decrease production of one or more fermentation end-products such as polyols or sugar alcohols.
- pretreatment of biomass comprises ionic liquid (IL) pretreatment.
- Biomass can be pretreated by incubation with an ionic liquid, followed by IL extraction with a wash solvent such as alcohol or water.
- the treated biomass can then be separated from the ionic liquid/wash- solvent solution by centrifugation or filtration, and sent to the ionic liquid (IL) pretreatment.
- IL ionic liquid
- a method can utilize a pretreatment process disclosed in U.S. Patent No. 4600590 to Dale, U.S. Patent No. 4644060 to Chou, U.S. Patent No. 5037663 to Dale.
- Alteration of the pH of a pretreated feedstock can be accomplished by washing the feedstock ⁇ e.g., with water) one or more times to remove an alkaline or acidic substance, or other substance used or produced during pretreatment. Washing can comprise exposing the pretreated feedstock to an equal volume of water 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 or more times.
- a pH modifier can be added. For example, an acid, a buffer, or a material that reacts with other materials present can be added to modulate the pH of the feedstock.
- more than one pH modifier can be used, such as one or more bases, one or more bases with one or more buffers, one or more acids, one or more acids with one or more buffers, or one or more buffers.
- more than one pH modifiers can be added at the same time or at different times.
- Other non- limiting exemplary methods for neutralizing feedstocks treated with alkaline substances have been described, for example in U.S. Patent Nos. 4,048,341; 4,182,780; and 5,693,296.
- one or more acids can be combined, resulting in a buffer.
- Suitable acids and buffers that can be used as pH modifiers include any liquid or gaseous acid that is compatible with the microorganism.
- Non-limiting examples include peroxyacetic acid, sulfuric acid, sulfurous acid, lactic acid, citric acid, phosphoric acid, and hydrochloric acid.
- the pH can be lowered to neutral pH or acidic pH, for example a pH of 7.0, 6.5, 6.0, 5.5, 5.0, 4.5, 4.0, or lower.
- the pH is lowered and/or maintained within a range of about pH 4.5 to about 7.1, or about 4.5 to about 6.9, or about pH 5.0 to about 6.3, or about pH 5.5 to about 6.3, or about pH 6.0 to about 6.5, or about pH 5.5 to about 6.9 or about pH 6.2 to about 6.7.
- biomass can be pre-treated at an elevated temperature and/or pressure.
- biomass is pre treated at a temperature range of 20°C to 400°C.
- biomass is pretreated at a temperature of about 20°C, 25°C, 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 80°C, 90°C, 100°C, 120°C, 150°C, 200°C, 250°C, 300°C, 350°C, 400°C or higher.
- temperatures are provided by the use of steam, hot water, or hot gases.
- steam can be injected into a biomass containing vessel.
- the steam, hot water, or hot gas can be injected into a vessel jacket such that it heats, but does not directly contact the biomass.
- a biomass can be treated at an elevated pressure.
- biomass is pre treated at a pressure range of about lpsi to about 30psi.
- biomass is pre treated at a pressure or about lpsi, 2psi, 3psi, 4psi, 5psi, 6psi, 7psi, 8psi, 9psi, lOpsi, 12psi, 15psi, 18psi, 20psi, 22psi, 24psi, 26psi, 28psi, 30psi or more.
- biomass can be treated with elevated pressures by the injection of steam into a biomass containing vessel.
- the biomass can be treated to vacuum conditions prior or subsequent to alkaline or acid treatment or any other treatment methods provided herein.
- alkaline or acid pretreated biomass is washed (e.g. with water (hot or cold) or other solvent such as alcohol (e.g. ethanol)), pH neutralized with an acid, base, or buffering agent (e.g. phosphate, citrate, borate, or carbonate salt) or dried prior to fermentation.
- the drying step can be performed under vacuum to increase the rate of evaporation of water or other solvents.
- the drying step can be performed at elevated temperatures such as about 20°C, 25°C, 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 80°C, 90°C, 100°C, 120°C, 150°C, 200°C, 250°C, 300°C or more.
- the pretreatment step includes a step of solids recovery.
- the solids recovery step can be during or after pretreatment (e.g., acid or alkali pretreatment), or before the drying step.
- the solids recovery step can include the use of a sieve, filter, screen, or a membrane for separating the liquid and solids fractions.
- a suitable sieve pore diameter size ranges from about 0.001 microns to 8mm, such as about 0.005microns to 3mm or about 0.01 microns to 1mm.
- a sieve pore size has a pore diameter of about O.Olmicrons, 0.02 microns, 0.05 microns, 0.1 microns, 0.5 microns, 1 micron, 2 microns, 4 microns, 5 microns, 10 microns, 20 microns, 25 microns, 50 microns, 75 microns, 100 microns, 125 microns, 150 microns, 200 microns, 250 microns, 300 microns, 400 microns, 500 microns, 750 microns, 1mm or more.
- biomass e.g. corn stover
- biomass e.g. corn stover
- a method of pre-treatment includes but is not limited to, biomass particle size reduction, such as for example shredding, milling, chipping, crushing, grinding, or pulverizing.
- biomass particle size reduction can include size separation methods such as sieving, or other suitable methods known in the art to separate materials based on size.
- size separation can provide for enhanced yields.
- separation of finely shredded biomass e.g.
- particles smaller than about 8 mm in diameter such as, 8, 7.9, 7.7, 7.5, 7.3, 7, 6.9, 6.7, 6.5, 6.3, 6, 5.9, 5.7, 5.5, 5.3, 5, 4.9, 4.7, 4.5, 4.3, 4, 3.9, 3.7, 3.5, 3.3, 3, 2.9, 2.7, 2.5, 2.3, 2, 1.9, 1.7, 1.5, 1.3, 1, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, or 0.1 mm) from larger particles allows the recycling of the larger particles back into the size reduction process, thereby increasing the final yield of processed biomass.
- a fermentative mixture which comprises a pretreated lignocellulosic feedstock comprising less than about 50% of a lignin component present in the feedstock prior to pretreatment and comprising more than about 60% of a hemicellulose component present in the feedstock prior to pretreatment; and a microorganism capable of fermenting a five-carbon sugar, such as xylose, arabinose or a combination thereof, and a six-carbon sugar, such as glucose, galactose, mannose or a combination thereof.
- a five-carbon sugar such as xylose, arabinose or a combination thereof
- a six-carbon sugar such as glucose, galactose, mannose or a combination thereof.
- pretreatment of the lignocellulosic feedstock comprises adding an alkaline substance which raises the pH to an alkaline level, for example NaOH.
- NaOH is added at a concentration of about 0.5% to about 2% by weight of the feedstock.
- pretreatment also comprises addition of a chelating agent.
- the biomass hydrolyzing unit provides useful advantages for the conversion of biomass to bio fuels and chemical products.
- One advantage of this unit is its ability to produce monomeric sugars from multiple types of biomass, including mixtures of different biomass materials, and is capable of hydrolyzing polysaccharides and higher molecular weight saccharides to lower molecular weight saccharides.
- the hydrolyzing unit utilizes a pretreatment process and a hydro lytic enzyme which facilitates the production of a sugar stream containing a concentration of a monomeric sugar or several monomeric sugars derived from cellulosic and/or hemicellulosic polymers.
- inulin fructans; glucans; corn; sugar cane; sorghum, other grasses; bamboo, algae, and material derived from these materials.
- This ability to use a very wide range of pretreatment methods and hydrolytic enzymes gives distinct advantages in biomass fermentations.
- Various pretreatment conditions and enzyme hydrolysis can enhance the extraction of sugars from biomass, resulting in higher yields, higher productivity, greater product selectivity, and/or greater conversion efficiency.
- the enzyme treatment is used to hydrolyze various higher saccharides (higher molecular weight) present in biomass to lower saccharides (lower molecular weight), such as in preparation for fermentation by biocatalysts such as yeasts to produce ethanol, hydrogen, or other chemicals such as organic acids including succinic acid, formic acid, acetic acid, and lactic acid. These enzymes and/or the hydrolysate can be used in fermentations to produce various products including fuels, and other chemicals.
- the process for converting biomass material into ethanol includes pretreating the biomass material (e.g., "feedstock"), hydro lyzing the pretreated biomass to convert polysaccharides to oligosaccharides, further hydrolyzing the biomass material (e.g., "feedstock"), hydro lyzing the pretreated biomass to convert polysaccharides to oligosaccharides, further hydrolyzing the biomass material (e.g., "feedstock"), hydro lyzing the pretreated biomass to convert polysaccharides to oligosacc
- Enzymes such as cellulases, polysaccharases, lipases, proteases, ligninases, and hemicellulases, help produce the monosaccharides can be used in the biosynthesis of fermentation end-products.
- Biomass material that can be utilized includes woody plant matter, non-woody plant matter, cellulosic material, lignocellulosic material, hemicellulosic material, carbohydrates, pectin, starch, inulin, fructans, glucans, corn, algae, sugarcane, other grasses, switchgrass, bagasse, wheat straw, barley straw, rice straw, corncobs, bamboo, citrus peels, sorghum, high biomass sorghum, seed hulls, and material derived from these.
- the final product can then be separated and/or purified, as indicated by the properties for the desired final product.
- compounds related to sugars such as sugar alcohols or sugar acids can be utilized as well.
- Chemicals that can be used in the methods disclosed herein can be purchased from a commercial supplier, such as Sigma- Aldrich. Additionally, commercial enzyme cocktails (e.g. AccelleraseTM 1000, CelluSeb-TL, CelluSeb-TS, CellicTM' CTec,
- enzyme cocktail can be purchased from vendors such as Specialty Enzymes & Biochemicals Co., Genencor, or Novozymes.
- enzyme cocktails can be prepared by growing one or more organisms such as for example a fungi (e.g. a Trichoderma, a Saccharomyces, a Pichia, a White Rot Fungus etc.), a bacteria (e.g.
- the harvesting can include one or more steps of purification of enzymes.
- treatment of biomass comprises enzyme hydrolysis.
- a biomass is treated with an enzyme or a mixture of enzymes, e.g., endoglucanases, exoglucanases, cellobio hydrolases, cellulase, beta-glucosidases, glycoside hydrolases, glycosyltransferases, lyases, esterases, amylases, glucoamylases, and proteins containing carbohydrate-binding modules.
- the enzyme or mixture of enzymes is one or more individual enzymes with distinct activities.
- the enzyme or mixture of enzymes can be enzyme domains with a particular catalytic activity.
- an enzyme with multiple activities can have multiple enzyme domains, including for example glycoside hydrolases, glycosyltransferases, lyases and/or esterases catalytic domains.
- enzymes that degrade polysaccharides are used for the hydrolysis of biomass and can include enzymes that degrade cellulose, namely, cellulases.
- cellulases include endocellulases and exo-cellulases that hydrolyze beta- 1,4-glucosidic bonds.
- enzymes that degrade polysaccharides are used for the hydrolysis of biomass and can include enzymes that have the ability to degrade
- Hemicellulose can be a major component of plant biomass and can contain a mixture of pentoses and hexoses, for example, D-xylopyranose, L- arabinofuranose, D-mannopyranose, Dglucopyranose, D-galactopyranose, D- glucopyranosyluronic acid and other sugars.
- enzymes that degrade polysaccharides are used for the hydrolysis of biomass and can include enzymes that have the ability to degrade pectin, namely, pectinases.
- the cross-linked cellulose network can be embedded in a matrix of pectins that can be covalently cross-linked to xyloglucans and certain structural proteins.
- Pectin can comprise homogalacturonan (HG) or rhamnogalacturonan (RH).
- hydrolysis of biomass includes enzymes that can hydrolyze starch.
- Enzymes that hydrolyze starch include alpha-amylase, glucoamylase, beta- amylase, exo-alpha-l,4-glucanase, and pullulanase.
- hydrolysis of biomass comprises hydrolases that can include enzymes that hydrolyze chitin.
- hydrolases can include enzymes that hydrolyze lichen, namely, lichenase.
- the feedstock contains cellulose, hemicellulose, soluble oligomers, simple sugars, lignin, volatiles and ash.
- the parameters of the hydrolysis can be changed to vary the concentration of the components of the pretreated feedstock.
- a hydrolysis can be chosen so that the concentration of soluble C5 saccharides is high and the concentration of lignin is low after hydrolysis.
- parameters of the hydrolysis include temperature, pressure, time, concentration, composition and pH.
- the parameters of the pretreatment and hydrolysis are changed to vary the concentration of the components of the pretreated feedstock such that concentration of the components in the pretreated and hydrolyzed feedstock is optimal for fermentation with a microbe such as a yeast or bacterium microbe.
- the parameters of the pretreatment are changed to encourage the release of the components of a genetically modified feedstock such as enzymes stored within a vacuole to increase or complement the enzymes synthesized by biocatalyst to produce optimal release of the fermentable components during hydrolysis and fermentation.
- the parameters of the pretreatment and hydrolysis are changed such that concentration of accessible cellulose in the pretreated feedstock is 1%, 5%, 10%, 12%, 13%, 14%, 15%, 16%, 17%, 19%, 20%, 30%, 40% or 50%. In one embodiment, the parameters of the pretreatment are changed such that concentration of accessible cellulose in the pretreated feedstock is 5% to 30%. In one embodiment, the parameters of the pretreatment are changed such that concentration of accessible cellulose in the pretreated feedstock is 10% to 20%.
- the parameters of the pretreatment are changed such that concentration of hemicellulose in the pretreated feedstock is 1%, 5%, 10%>, 12%, 13%, 14%, 15%, 16%, 17%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 40% or 50%.
- the parameters of the pretreatment are changed such that concentration of hemicellulose in the pretreated feedstock is 5% to 40%.
- the parameters of the pretreatment are changed such that concentration of hemicellulose in the pretreated feedstock is 10% to 30%.
- the parameters of the pretreatment and hydrolysis are changed such that concentration of soluble oligomers in the pretreated feedstock is 1%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%), or 99%).
- soluble oligomers include, but are not limited to, cellobiose and xylobiose.
- the parameters of the pretreatment are changed such that concentration of soluble oligomers in the pretreated feedstock is 30% to 90%.
- the parameters of the pretreatment and/or hydrolysis are changed such that concentration of soluble oligomers in the pretreated feedstock is 45% to 80%.
- the parameters of the pretreatment and hydrolysis are changed such that concentration of simple sugars in the pretreated feedstock is 1%, 5%, 10%, 12%, 13%, 14%, 15%, 16%, 17%, 19%, 20%, 30%, 40% or 50%. In one embodiment, the parameters of the pretreatment and hydrolysis are changed such that concentration of simple sugars in the pretreated feedstock is 0% to 20%. In one embodiment, the parameters of the pretreatment and hydrolysis are changed such that concentration of simple sugars in the pretreated feedstock is 0% to 5%. Examples of simple sugars include, but are not limited to, C5 and C6 monomers and dimers.
- the parameters of the pretreatment are changed such that concentration of lignin in the pretreated and/or hydrolyzed feedstock is 1%, 5%, 10%, 12%, 13%, 14%, 15%, 16%, 17%, 19%, 20%, 30%, 40% or 50%.
- the parameters of the pretreatment and/or hydrolysis are changed such that concentration of lignin in the pretreated feedstock is 0% to 20%.
- the parameters of the pretreatment and/or hydrolysis are changed such that concentration of lignin in the pretreated feedstock is 0% to 5%.
- the parameters of the pretreatment and hydrolysis are changed such that concentration of lignin in the pretreated and/or hydrolyzed feedstock is less than 1% to 2%. In one embodiment, the parameters of the pretreatment and/or hydrolysis are changed such that the concentration of phenolics is minimized.
- the parameters of the pretreatment and/or hydrolysis are changed such that concentration of furfural and low molecular weight lignin in the pretreated and/or hydrolyzed feedstock is less than 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, or 1%. In one embodiment, the parameters of the pretreatment and/or hydrolysis are changed such that concentration of furfural and low molecular weight lignin in the pretreated and/or hydrolyzed feedstock is less than 1% to 2%.
- the parameters of the pretreatment and/or hydrolysis are changed such that the concentration of simple sugars is at least 75% to 85%, and the concentration of lignin is 0% to 5% and the concentration of furfural and low molecular weight lignin in the pretreated feedstock is less than 1% to 2%.
- the parameters of the pretreatment and/or hydrolysis are changed to obtain a high concentration of hemicellulose and a low concentration of lignin. In one embodiment, the parameters of the pretreatment and/or hydrolysis are changed to obtain a high concentration of hemicellulose and a low concentration of lignin such that
- concentration of the components in the pretreated stock is optimal for fermentation with a microbe such as bio catalyst.
- more than one of these steps can occur at any given time.
- hydrolysis of the pretreated feedstock and hydrolysis of the oligosaccharides can occur simultaneously, and one or more of these can occur simultaneously to the conversion of monosaccharides to a fuel or chemical.
- an enzyme can directly convert the polysaccharide to monosaccharides.
- an enzyme can hydrolyze the polysaccharide to oligosaccharides and the enzyme or another enzyme can hydrolyze the oligosaccharides to monosaccharides.
- the enzymes can be added to the fermentation or they can be produced by microorganisms present in the fermentation. In one embodiment, the microorganism present in the fermentation produces some enzymes. In another embodiment, enzymes are produced separately and added to the fermentation.
- the enzymes for each conversion step can be present with sufficiently high activity. If one of these enzymes is missing or is present in insufficient quantities, the production rate of an end product can be reduced. The production rate can also be reduced if the microorganisms responsible for the conversion of monosaccharides to product only slowly take up monosaccharides and/or have only limited capability for translocation of the monosaccharides and intermediates produced during the conversion to end product.
- oligomers are taken up slowly by a biocatalyst, necessitating an almost complete conversion of polysaccharides and oligomers to monomeric sugars.
- the enzymes of the method are produced by a biocatalyst, including a range of hydro lytic enzymes suitable for the biomass materials used in the fermentation methods.
- a biocatalyst is grown under conditions appropriate to induce and/or promote production of the enzymes needed for the
- the production of these enzymes can occur in a separate vessel, such as a seed fermentation vessel or other fermentation vessel, or in the production fermentation vessel where ethanol production occurs.
- the enzymes can, for example, be transferred to the production fermentation vessel along with the cells, or as a relatively cell free solution liquid containing the intercellular medium with the enzymes.
- the enzymes can also be dried and/or purified prior to adding them to the hydrolysis or the production fermentation vessel.
- the conditions appropriate for production of the enzymes are frequently managed by growing the cells in a medium that includes the biomass that the cells will be expected to hydrolyze in subsequent fermentation steps. Additional medium components, such as salt supplements, growth factors, and cofactors including, but not limited to phytate, amino acids, and peptides can also assist in the production of the enzymes utilized by the microorganism in the production of the desired products.
- the blended feedstocks can comprise a first biomass and one or more monosaccharides produced by pretreating and/or hydrolyzing a second biomass comprising cellulose, hemicellulose, hgnocellulose and/or starch.
- the one or more monosaccharides can include C6 and/or C5 monosaccharides.
- the one or more monosaccharides can be in a C6-enriched hydrolysate (C6 Saccharide Stream).
- the one or more monosaccharides can be in a C5-enriched hydrolysate (C5 Saccharide Stream).
- the one or more monosaccharides can comprise both C5 and C6 saccharides (C5 + C6 Saccharide Stream).
- the one or more monosaccharides can include cellulosic-derived monosaccharides.
- the one or more monosaccharides can include non-cellulosic-derived monosaccharides (e.g., starch-derived monosaccharides).
- the one or more monosaccharides can include glucose, fructose, galactose, xylose, or any other saccharides.
- the first biomass can comprise non- cellulosic polysaccharides (e.g., starch).
- a blended feedstock can comprise from about 1% to about 50% solids from a first biomass.
- the blended feedstock can comprise about 1-50%, 10-50%), 20- 40%, 20-36%, 20-35%, 20-34%, 20-33%, 20-32%, 20-31%, 20-30%, 25-36%, 25-35%, 25- 34%, 25-33%, 25-32%, 25-31%, 25-30%, 30-36%, 30-35%, 30-34%, 30-33%, 30-32%, or 30-31% solids from the first biomass.
- the first biomass comprises non- cellulosic saccharides.
- the non-cellulosic saccharides comprise starch.
- the non-cellulosic saccharides comprise sucrose.
- another biomass comprises non- cellulosic saccharides.
- the non-cellulosic saccharides comprise starch.
- the non-cellulosic saccharides comprise sucrose.
- the non-cellulosic saccharides comprise starch and/or sucrose.
- a blended feedstock can be produced by combining a first biomass (e.g., containing non-cellulosic saccharides such as starch or sucrose) with one or more cellulosic- derived or non-cellulosic derived monosaccharides (e.g., C6 saccharides, C5 saccharides, or a combination thereof).
- the one or more cellulosic-derived or non-cellulosic-derived monosaccharides can be at a concentration of from about 1% to about 70% w/v prior to combining with the first biomass.
- the one or more monosaccharides can be at a concentration of about 1-70% w/v, 1-60% w/v, 1-55% w/v, 1-50% w/v, 1-40% w/v, 1-30% w/v, 1-20% w/v, 1-10% w/v, 10-70% w/v, 10-60% w/v, 10-55% w/v, 10-50% w/v, 10-40% w/v, 10-30% w/v, 10-20% w/v, 20-70% w/v, 20-60% w/v, 20-55% w/v, 20-50% w/v, 20- 40% w/v, 20-30% w/v, 30-70% w/v, 30-60% w/v, 30-55% w/v, 30-50% w/v, 30-40% w/v, 40-70% w/v, 40-60% w/v, 40-55% w/v, 40-50%
- a blended feedstock can be produced by combining a first biomass (e.g., containing non-cellulosic saccharides such as starch) with one or more cellulosic-derived monosaccharides.
- a first biomass e.g., containing non-cellulosic saccharides such as starch
- the one or more cellulosic-derived monosaccharides can be C6
- the one or more cellulosic-derived monosaccharides can be in a crude-lysate from the pretreatment and/or hydrolysis of cellulose, hemicellulose, and/or lignocellulosic material.
- the one or more cellulosic-derived monosaccharides can comprise less than 50%, 45%, 40%, 35%, 30%, 25%, 20%, 15%, 10%, 5%, 4%, 3%, 2%, 1.5%, 1%, 0.9%, 0.8%, 0.7%, 0.6%, 0.5%, 0.4%, 0.3%, 0.2%, 0.1% or less w/v of one or more inhibitory compounds.
- the one or more inhibitory compounds can be one or more byproducts of the pretreatment and/or hydrolysis of cellulose, hemicellulose, and/or lignocellulose.
- the one or more inhibitory compounds can comprise one or more organic acids such as acetic acid, lactic acid, or formic acid, and/or one or more furans such as hydroxy methyl furfural or furfural, or a combination thereof.
- Enhanced rates of fermentation can be achieved using blended feedstocks comprising a first biomass containing non-cellulosic saccharides (e.g., starch, sucrose, etc.) and one or more cellulosic-derived monosaccharides (e.g., C6 monosaccharide, C5 monosaccharides) in comparison to fermentation of the first biomass without the one or more cellulosic-derived monosaccharides.
- a first biomass containing non-cellulosic saccharides e.g., starch, sucrose, etc.
- cellulosic-derived monosaccharides e.g., C6 monosaccharide, C5 monosaccharides
- the enhanced rates of fermentation can be from about 1% higher to about 100% higher; for example, about 1-100%, 1-75%, 1-50%, 1-25%, 1-10%, 10-100%, 10-75%, 10-50%, 10-25%, 25-100%, 25-75%, 25-50%, 50-100%, 50-75%, 75- 100%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 1 1%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 100% higher.
- Increased yields of one or more fermentation end-products can be achieved using blended feedstocks comprising a first biomass containing non-cellulosic saccharides (e.g., starch, sucrose, etc.) and one or more cellulosic-derived monosaccharides (e.g., C6 monosaccharide, C5 monosaccharides) in comparison to fermentation of the first biomass without the one or more cellulosic-derived monosaccharides.
- non-cellulosic saccharides e.g., starch, sucrose, etc.
- cellulosic-derived monosaccharides e.g., C6 monosaccharide, C5 monosaccharides
- the increased yields of one or more fermentation end-products can be from about 1% higher to about 100% higher; for example, about 1-100%, 1-75%, 1-50%, 1-25%, 1-10%, 1-5%, 5-10%, 10-100%, 10-75%, 10-50%, 10-25%, 25-100%, 25-75%, 25-50%, 50-100%, 50-75%, 75-100%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 1 1%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%,
- a blended feedstock can be prepared by combining a first biomass with a saccharide stream comprising one or more cellulosic-derived monosaccharides, one or more non-cellulosic derived monosaccharides, or a combination thereof.
- the first biomass can comprise non-cellulosic saccharides such as starch or sucrose.
- the one or more cellulosic- derived monosaccharides or non-cellulosic derived monosaccharides can be produced by the pretreatment and/or hydrolysis of a second biomass.
- the second biomass can comprise cellulose, hemicellulose, lignocellulose, and/or starch.
- the pretreatment and/or hydrolysis of the second biomass can produce a C6-enriched hydrolysate (C6 Saccharide Stream).
- the pretreatment and/or hydrolysis of the second biomass can produce a C5-enriched hydrolysate (C5 Saccharide Stream).
- the pretreatment and/or hydrolysis of the second biomass can produce a hydrolysate containing both C5 and C6 monosaccharides (C5 + C6 Saccharide Stream).
- the one or more cellulosic-derived monosaccharides are at a concentration that differs from the concentration of saccharides in the first biomass by less than about +/- 50%, 40%, 30%, 20%, 15%, 10%, 5%, or 1%, wherein the concentration of saccharides in the first biomass assumes complete hydrolysis of the first biomass to monomers (e.g., is in monosaccharide equivalents).
- a blended feedstock can be prepared by combining a first biomass with a saccharide stream comprising one or more cellulosic-derived monosaccharides, one or more non-cellulosic derived monosaccharides, or a combination thereof.
- the first biomass can comprise non-cellulosic saccharides such as starch or sucrose.
- the monosaccharides can be produced by the pretreatment and/or hydrolysis of a second biomass.
- the second biomass can comprise cellulose, hemicellulose, lignocellulose, and/or starch.
- the pretreatment and/or hydrolysis of the second biomass can produce a C6-enriched hydrolysate (C6 Saccharide Stream), a C5-enriched hydrolyzate (C5 Saccharide Stream), or a C5 and C6 hydro lyzate (C5 + C6 Saccharide Stream).
- the first biomass and the saccharides stream comprising the one or more monosaccharides are combined in about a 50:50, 55 :45, 60:40:, 65 :35, 70:30, 75 :35, 80:20, 85 : 15, 90: 10, 95 :5, or 99: 1 ratio.
- the ratio can be a weight to weight ratio, a weight to volume ratio, or a volume to volume ratio.
- microorganisms such as bacteria or yeast to hypertonic solution can cause an efflux of cellular water into the medium.
- microorganisms can produce and accumulate one or more osmoregulatory molecules such as polyhydroxy compounds, (e.g., see Nevoit and Stahl (1997) FEMS Microbiology Review 21 :231-241 and Parekh and Pandey (1985)
- microorganisms such as yeast can redirect part of the carbon released during enzymatic hydrolysis of starch to one or more other products such as polyols or sugar alcohols (e.g., glycerol) instead of fermentation end-products such as ethanol.
- glycerol sugar alcohols
- This can occur, for example, when glucose is overly abundant during the fermentation reaction, for example, due to the conversion of starch to glucose monomers or the addition of a saccharide stream comprising one or more monosaccharides (e.g., C5 monosaccharides, C6 monosaccharides, or both).
- Environmental factors affecting these pathways can include oxygen availability, type of nitrogen source, osmotic pressure, heat and pH. For example, when glucose is overly abundant, a high osmotic pressure can shift metabolism to the production of glycerol.
- one or more cellulosic-derived C6 monosaccharides are added over time in a fed-batch fermentation reaction comprising a first biomass containing non-cellulosic saccharides such as starch.
- the high level of solids in many fermentation reactions using biomass containing non-cellulosic saccharides (e.g., corn mash) can cause osmotic stress upon the biocatalyst microorganisms in the fermentation reaction (e.g., yeast, bacteria, etc.).
- the osmotic stress can cause the microorganisms to produce osmoregulatory compounds such as polyols (e.g., glycerol) or sugar alcohols.
- blended feedstocks comprising a first biomass containing non- cellulosic saccharides and a saccharide stream comprising one or more monosaccharides (e.g., cellulosic-derived or non-cellulosic derived monosaccharides)
- the solids of the first biomass can be diluted. This can reduce osmotic stress upon the microorganisms and reduce the production of fermentation end-products such as osmoregulatory compounds (e.g., polyols or sugar alcohols). The reduced production of osmoregulatory compounds can increase the rate and/or yield of alcohols such as ethanol, methoanol, butanol, etc.
- osmoregulatory molecules such as polyols or sugar alcohols (e.g., glycerol)
- reduced production of polyols such as glycerol can be achieved using blended feedstocks comprising a first biomass and a saccharide stream comprising one or more cellulosic-derived monosaccharides, one or more non-cellulosic derived monosaccharides, or a combination thereof.
- the first biomass can comprise non-cellulosic saccharides such as starch or sucrose.
- the saccharide stream comprising the one or more monosaccharides can be produced by the pretreatment and/or hydrolysis of a second biomass.
- the second biomass can comprise cellulose, hemicellulose, lignocellulose, and/or starch.
- the saccharide stream can be a C6- enriched hydrolysate (C6 Saccharide Stream), a C5-enriched hydro lysate (C5 Saccharide Stream), or a C5 and C6 containing hydrolyzate (C5 + C6 Saccharide Stream).
- the amount of one or more other products produced can be from about 1% to about 100% lower; for example, about 1-100%, 1-75%, 1-50%, 1-25%, 1-10%, 1-5%, 5-10%, 10-100%, 10-75%, 10-50%, 10-25%, 25-100%, 25-75%, 25-50%, 50-100%, 50-75%, 75-100%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%
- the saccharide stream comprising the one or more monosaccharides are added in a fed batch manner and the reduced production of the one or more other products is in comparison to a non-fed batch fermentation reaction. In another embodiment, the saccharide stream comprising the one or more monosaccharides are added in a batch fermentation and the reduced production of the one or more other products is in comparison to a fermentation reaction containing the first biomass only.
- the saccharide stream comprising the one or more monosaccharides can be added at a rate of from about 0.001 mL/min/L of broth to about 50 mL/min/L of broth.
- the saccharide stream comprising the one or more monosaccharides can be added at a rate of about 0.001-50 mL/min/L, 0.001-25 mL/min/L, 0.001-10 mL/min/L, 0.001-5 mL/min/L, 0.001-1 mL/min/L, 0.001-0.7 mL/min/L, 0.001-0.5 mL/min/L, 0.001-0.1 mL/min/L, 0.001- 0.01 mL/min/L, 0.01-50 mL/min/L, 0.01-25 mL/min/L, 0.01-10 mL/min/L, 0.01-5 mL/min/L, 0.01-1 mL/min/L, 0.01-0.7 mL/min/L, 0.01-0.5 mL/min/L, 0.01-0.1 mL/min/L, 0.1-50 mL/min/L, 0.1-25 mL/min/L,
- the concentration of monosaccharides in a blended feedstock prior to contacting with one or more bio catalysts can be less than about 100 g/L; for example, less than about 100 g/L, 90 g/L, 80 g/L, 70 g/L, 60 g/L, 50 g/L, 40 g/L, 30 g/L, 25 g/L, 20 g/L, 15 g/L, 10 g/L, 9 g/L, 8 g/L, 7 g/L, 6 g/L, 5 g/L, 4 g/L, 3 g/L, 2 g/L, or 1 g/L.
- the concentration of monosaccharides in a blended feedstock prior to contacting with one or more bio catalysts can be from about 1 g/L to about 100 g/L; for example, about 1-100 g/L, 1-75 g/L, 1-50 g/L, 1-25 g/L, 1-10 g/L, 10-100 g/L, 10-75 g/L, 10- 50 g/L, 10-25 g/L, 25-100 g/L, 25-75 g/L, 25-50 g/L, 50-100 g/L, 50-75 g/L, or 75-100 g/L.
- the present disclosure also provides a fermentative mixture comprising: a cellulosic feedstock pre-treated with an alkaline or acid substance and at a temperature of from about 80°C to about 120°C; subsequently hydro lyzed with an enzyme mixture, and a microorganism capable of fermenting a five-carbon sugar and/or a six-carbon sugar.
- the five-carbon sugar is xylose, arabinose, or a combination thereof.
- the six-carbon sugar is glucose, galactose, mannose, or a combination thereof.
- the alkaline substance is NaOH. In some embodiments, NaOH is added at a concentration of about 0.5% to about 2% by weight of the feedstock.
- the acid is equal to or less than 2% HC1 or H 2 SO 4 .
- the microorganism is a Rhodococcus strain, a Clostridium strain, a Trichoderma strain, a Saccharomyces strain, a Zymomonas strain, or another microorganism suitable for fermentation of biomass.
- the fermentation process comprises fermentation of the biomass using a microorganism that is Clostridium phytofermentans, Clostridium algidixylanolyticum, Clostridium xylanolyticum, Clostridium cellulovorans, Clostridium cellulolyticum,
- Clostridium thermocellum Clostridium josui, Clostridium papyrosolvens, Clostridium cellobioparum, Clostridium hungatei, Clostridium cellulosi, Clostridium stercorarium, Clostridium termitidis, Clostridium thermocopriae, Clostridium celerecrescens, Clostridium polysaccharolyticum, Clostridium populeti, Clostridium lentocellum, Clostridium
- the microorganism is genetically modified to enhance activity of one or more hydro lytic enzymes, such as a genetically-modified Saccaromyces cerevisae.
- a wild type or a genetically-improved microorganism can be used for chemical production by fermentation.
- Methods to produce a genetically- improved strain can include genetic modification, mutagenesis, and adaptive processes, such as directed evolution.
- yeasts can be genetically-modified to ferment C5 sugars.
- Other useful yeasts are species of Candida, Cryptococcus, Debaryomyces, Deddera,
- Rhodococus strains such as Rhodococcus opacus variants are a source of triacylglycerols and other storage lipids. (See, e.g., Waltermann, et al., Microbiology 146: 1143-1149 (2000)).
- Other useful organisms for fermentation include, but are not limited to, yeasts, especially Saccaromyces strains and bacteria such as Clostridium phytofermentans,
- Thermoanaerobacter ethanolicus Clostridium thermocellum, Clostridium beijerinickii, Clostridium acetobutylicum, Clostridium tyrobutyricum, Clostridium thermobutyricum, Thermoanaerobacterium saccharolyticum, Thermoanaerobacter thermohydrosulfuricus, Clostridium acetobutylicum, Moorella ssp., Carboxydocella ssp., Zymomonas mobilis, recombinant E. Coli, Klebsiella oxytoca, Rhodococcus opacus and Clostridium beijerickii.
- yeasts are their ability to grow under conditions that include elevated ethanol concentration, high sugar concentration, low sugar concentration, and/or operate under anaerobic conditions. These characteristics, in various combinations, can be used to achieve operation with long or short fermentation cycles and can be used in combination with batch fermentations, fed batch fermentations, self-seeding/partial harvest fermentations, and recycle of cells from the final fermentation as inoculum.
- yeasts that can be used as a biocatalyst or fermentive microorganism in the methods disclosed herein include but are not limited to, species found in the genus Ascoidea, Brettanomyces, Candida, Cephaloascus, Coccidiascus, Dipodascus, Eremothecium, Galactomyces, Kluyveromyces, Pichia, Saccharomyces,
- Candida amphixiae Candida amphixiae
- Candida atmosphaerica Candida blattae
- Candida carpophila Candida cerambycidarum
- Candida chauliodes Candida corydali
- Candida dosseyi Candida dubliniensis
- Candida ergatensis Candida fructus, Candida glabrata
- Candida fermentati Candida guilliermondii
- Candida haemulonii Candida insectamens
- Candida insectorum Candida intermedia
- Candida jeffresii Candida kefyr
- Candida krusei Candida lusitaniae
- Candida lyxosophila Candida maltosa
- Candida oleophila Candida oregonensis
- Candida parapsilosis Candida quercitrusa, Candida rugosa, Candida sake, Candida shehatea, Candida temnochilae,
- Saccharomyces can be Saccharomyces dairenensis, Saccharomyces ellipsoideus, Saccharomyces eubayanus, Saccharomyces exiguus, Saccharomyces florentinus,
- Saccharomyces kluyveri Saccharomyces martiniae
- Saccharomyces monacensis Saccharomyces monacensis
- Saccharomyces norbensis Saccharomyces paradoxus
- Saccharomyces pastorianus Saccharomyces pastorianus
- Saccharomyces spencerorum Saccharomyces turicensis, Saccharomyces unisporus, Saccharomyces uvarum, Saccharomyces zonatus, Schizosaccharomyces cryophilus,
- Schizosaccharomyces japonicus Schizosaccharomyces octosporus, Schizosaccharomyces pombe, Sporopachydermia cereana, Sporopachydermia lactativora, Sporopachydermia quercuum, Torulaspora delbrueckii, Torulaspora franciscae, Torulaspora globosa,
- Torulaspora pretoriensis Yarrowia lipolytica, Zygosaccharomyces bailii,
- Zygosaccharomyces bisporus Zygosaccharomyces cidri, Zygosaccharomyces fermentati, Zygosaccharomyces florentinus, Zygosaccharomyces kombuchaensis, Zygosaccharomyces lentus, Zygosaccharomyces mellis, Zygosaccharomyces micro ellipsoides
- bacteria that can be used as a biocatalyst or fermentive microorganism in the methods disclosed herein include but are not limited to any bacterium found in the genus of Butyrivibrio, Ruminococcus, Eubacterium, Bacteroides, Acetivibrio, Caldibacillus, Acidothermus, Cellulomonas, Curtobacterium, Micromonospora,
- Actinoplanes Streptomyces, Thermobifida, Thermomonospora, Microbispora, Fibrobacter, Sporocytophaga, Cytophaga, Flavobacterium, Achromobacter, Xanthomonas, Cellvibrio, Pseudomonas, Myxobacter, Escherichia, Klebsiella, Thermoanaerobacterium,
- Caldicellulosiruptor Anaerocellum, Anoxybacillus, Zymomonas, Clostridium; for example, Butyrivibrio fibrisolvens, Ruminococcus flavefaciens, Ruminococcus succinogenes,
- Ruminococcus albus Eubacterium cellulolyticum, Bacteroides cellulosolvens, Acetivibrio cellulolyticus, Acetivibrio cellulosolvens, Caldibacillus cellulovorans, Bacillus circulans, Acidothermus cellulolyticus, Cellulomonas cartae, Cellulomonas cellasea, Cellulomonas cellulans, Cellulomonas fimi, Cellulomonas flavigena, Cellulomonas gelida, Cellulomonas iranensis, Cellulomonas persica, Cellulomonas uda, Curtobacterium falcumfaciens, Micromonospora melonosporea, Actinoplanes aurantiaca, Streptomyces reticuli,
- Sporocytophaga myxococcoides Cytophaga sp., Flavobacterium johnsoniae, Achromobacter piechaudii, Xanthomonas sp. , Cellvibrio vulgaris, Cellvibrio fulvus, Cellvibrio gilvus, Cellvibrio mixtus, Pseudomonas fluorescens, Pseudomonas mendocina, Myxobacter sp.
- thermo saccharolyticum Thermoanaerobacterium thermo saccharolyticum
- thermohydrosulfuricus Thermoanaerobacter ethanolicus, Thermoanaerobacter brocki, Geobacillus thermoglucosidasius, Geobacillus stearothermophilus, Saccharococcus caldoxylosilyticus, Saccharoccus thermophilus, Paenibacillus campinasensis, Bacillus flavothermus, Anoxybacillus kamchatkensis, Anoxybacillus gonensis, Caldicellulosiruptor acetigenus, Caldicellulosiruptor saccharolyticus, Caldicellulosiruptor kristjanssonii, Caldicellulosiruptor owensensis, Caldicellulosiruptor lactoaceticus, Anaerocellum thermophilum, Clostridium thermocellum, Clostridium cellulolyticum, Clostridium straminosolvens, Clostridium acetobutylic
- Clostridium perfringens Clostridium phytofermentans
- Clostridium piliforme Clostridium ramosum
- Clostridium scatologenes Clostridium septicum
- fed-batch fermentation is performed on the treated biomass to produce a fermentation end-product, such as alcohol, ethanol, organic acid, succinic acid, TAG, or hydrogen.
- a fermentation end-product such as alcohol, ethanol, organic acid, succinic acid, TAG, or hydrogen.
- the fermentation process comprises simultaneous hydrolysis and fermentation (SSF) of the biomass using one or more microorganisms such as a Rhodococcus strain, a Clostridium strain, a Trichoderma strain, a Saccharomyces strain, a Zymomonas strain, or another microorganism suitable for fermentation of biomass.
- SSF simultaneous hydrolysis and fermentation
- the fermentation process comprises simultaneous hydrolysis and fermentation of the biomass using a microorganism that is Clostridium algidixylanolyticum, Clostridium xylanolyticum, Clostridium cellulovorans, Clostridium cellulolyticum, Clostridium thermocellum, Clostridium josui, Clostridium papyrosolvens, Clostridium cellobioparum, Clostridium hungatei, Clostridium cellulosi, Clostridium stercorarium, Clostridium termitidis, Clostridium thermocopriae, Clostridium celerecrescens, Clostridium polysaccharolyticum, Clostridium populeti, Clostridium lentocellum, Clostridium chartatabidum, Clostridium aldrichii, Clostridium herbivorans, Clostridium phytofermentans, Acetivibrio cellulolyticus, Bacteroides cell
- thermo saccharolyticum Sacharophagus degradans, or Thermoanaerobacterium
- the fermentation process can include separate hydrolysis and fermentation (SHF) of a biomass with one or more enzymes, such as a xylanases, endo- 1 ,4-beta-xylanases, xylosidases, beta-D-xylosidases, cellulases, hemicellulases,
- SHF hydrolysis and fermentation
- carbohydrases glucanases, endoglucanases, endo-l,4-beta-glucanases, exoglucanases, glucosidases, beta-D-glucosidases, amylases, cellobiohydrolases, exocellobiohydrolases, phytases, proteases, peroxidase, pectate lyases, galacturonases, or laccases.
- glucanases endoglucanases, endo-l,4-beta-glucanases, exoglucanases, glucosidases, beta-D-glucosidases, amylases, cellobiohydrolases, exocellobiohydrolases, phytases, proteases, peroxidase, pectate lyases, galacturonases, or laccases.
- one or more enzymes used to treat a biomass is thermostable.
- a biomass is treated with one or more enzymes, such as those provided herein, prior to fermentation.
- a biomass is treated with one or more enzymes, such as those provided herein, during fermentation.
- a biomass is treated with one or more enzymes, such as those provided herein, prior to fermentation and during fermentation.
- an enzyme used for hydrolysis of a biomass is the same as those added during fermentation.
- an enzyme used for hydrolysis of biomass is different from those added during fermentation.
- fermentation can be performed in an apparatus such as bioreactor, a fermentation vessel, a stirred tank reactor, or a fluidized bed reactor.
- the treated biomass can be supplemented with suitable chemicals to facilitate robust growth of the one or more fermenting organisms.
- a useful supplement includes but is not limited to, a source of nitrogen and/or amino acids such as yeast extract, cysteine, or ammonium salts (e.g. nitrate, sulfate, phosphate etc.); a source of simple carbohydrates such as corn steep liquor, and malt syrup; a source of vitamins such as yeast extract; buffering agents such as salts (including but not limited to citrate salts, phosphate salts, or carbonate salts); or mineral nutrients such as salts of magnesium, calcium, or iron.
- redox modifiers are added to the fermentation mixture including but not limited to cysteine or mercaptoethanol.
- the titer and/or productivity of fermentation end-product production by a microorganism is improved by culturing the microorganism in a medium comprising one or more compounds comprising hexose and/or pentose sugars.
- a process comprises conversion of a starting material (such as a biomass) to a bio fuel, such as one or more alcohols.
- methods can comprise contacting substrate comprising both hexose (e.g. glucose, cellobiose) and pentose (e.g. xylose, arabinose) saccharides with a microorganism that can hydrolyze C5 and C6 saccharides to produce ethanol.
- methods can comprise contacting substrate comprising both hexose (e.g. glucose, cellobiose) and pentose (e.g. xylose, arabinose) saccharides with R. opacus to produce TAG.
- hexose e.g. glucose, cellobiose
- pentose e.g. xylose, arabinose
- batch fermentation with a microorganism of a mixture of hexose and pentose saccharides using the methods disclosed herein can provide uptake rates of about 0.1-8 g/L/h or more of hexose and about 0.1-8 g/L/h or more of pentose (xylose, arabinose, etc.).
- batch fermentation with a microorganism of a mixture of hexose and pentose saccharides using the methods disclosed herein can provide uptake rates of about 0.1, 0.2, 0.4, 0.5, 0.6 0.7, 0.8, 1, 2, 3, 4, 5, or 6 g/L/h or more of hexose and about 0.1, 0.2, 0.4, 0.5, 0.6 0.7, 0.8, 1, 2, 3, 4, 5, or 6 g/L/h or more of pentose.
- a method for production of ethanol or another alcohol produces about 10 g/1 to 120 gain 40 hours or less.
- a method for production of ethanol produces about 10 g/1, 11 g/L, 12 g/L, 13 g/L, 14 g/L, 15 g/L, 16 g/L, 17 g/L, 18 g/L, 19 g/L, 20 g/L, 21 g/L, 22 g/L, 23 g/L, 24 g/L, 25 g/L, 26 g/L, 27 g/L, 28 g/L, 29 g/L, 30 g/L, 31 g/L, 32 g/L, 33 g/L, 34 g/L, 35 g/L, 36 g/L, 37 g/L, 38 g/L, 39 g/L, 40 g/L, 41 g/L, 42 g/L, 43 g/L, 44 g/L
- microorganism comprising simultaneous fermentation of hexose and pentose saccharides.
- the level of a medium component is maintained at a desired level by adding additional medium component as the component is consumed or taken up by the organism.
- medium components included, but are not limited to, carbon substrate, nitrogen substrate, vitamins, minerals, growth factors, cofactors, and biocatalysts.
- the medium component can be added continuously or at regular or irregular intervals.
- additional medium component is added prior to the complete depletion of the medium component in the medium.
- complete depletion can effectively be used, for example to initiate different metabolic pathways, to simplify downstream operations, or for other reasons as well.
- the medium component level is allowed to vary by about 10% around a midpoint, in one embodiment, it is allowed to vary by about 30% around a midpoint, and in one embodiment, it is allowed to vary by 60% or more around a midpoint.
- the medium component level is maintained by allowing the medium component to be depleted to an appropriate level, followed by increasing the medium component level to another appropriate level.
- a medium component such as vitamin
- the nitrogen level is maintained at a desired level by adding additional nitrogen-containing material as nitrogen is consumed or taken up by the organism.
- the nitrogen-containing material can be added continuously or at regular or irregular intervals.
- Useful nitrogen levels include levels of about 5 to about 10 g/L. In one embodiment, levels of about 1 to about 12 g/L can also be usefully employed. In another embodiment, levels, such as about 0.5, 0.1 g/L or even lower, and higher levels, such as about 20, 30 g/L or even higher are used.
- a useful nitrogen level is about 0.01, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 23, 24, 25, 26, 27, 28, 29 or 30 g/L.
- Nitrogen can be supplied as a simple nitrogen-containing material, such as an ammonium compounds (e.g. ammonium sulfate, ammonium hydroxide, ammonia, ammonium nitrate, or any other compound or mixture containing an ammonium moiety), nitrate or nitrite compounds (e.g.
- a more complex nitrogen-containing material such as amino acids, proteins, hydro lyzed protein, hydro lyzed yeast, yeast extract, dried brewer's yeast, yeast hydrolysates, distillers' grains, soy protein, hydrolyzed soy protein, fermentation products, and processed or corn steep powder or unprocessed protein-rich vegetable or animal matter, including those derived from bean
- Nitrogen-containing materials useful in various embodiments also include materials that contain a nitrogen-containing material, including, but not limited to mixtures of a simple or more complex nitrogen-containing material mixed with a carbon source, another nitrogen-containing material, or other nutrients or non- nutrients, and AFEX treated plant matter.
- the carbon level is maintained at a desired level by adding sugar compounds or material containing sugar compounds ("Sugar-Containing Material") as sugar is consumed or taken up by the organism.
- the sugar-containing material can be added continuously or at regular or irregular intervals.
- additional sugar-containing material is added prior to the complete depletion of the sugar compounds available in the medium.
- complete depletion can effectively be used, for example to initiate different metabolic pathways, to simplify downstream operations, or for other reasons as well.
- the carbon level (as measured by the grams of sugar present in the sugar-containing material per liter of broth) is allowed to vary by about 10% around a midpoint, in one embodiment, it is allowed to vary by about 30% around a midpoint, and in one embodiment, it is allowed to vary by 60% or more around a midpoint.
- the carbon level is maintained by allowing the carbon to be depleted to an appropriate level, followed by increasing the carbon level to another appropriate level. In some embodiments, the carbon level can be maintained at a level of about 5 to about 120 g/L. However, levels of about 30 to about 100 g/L can also be usefully employed as well as levels of about 60 to about 80 g/L.
- the carbon level is maintained at greater than 25 g/L for a portion of the culturing. In another embodiment, the carbon level is maintained at about 5 g/L, 6 g/L, 7 g/L, 8 g/L, 9 g/L, 10 g/L, 1 1 g/L, 12 g/L, 13 g/L, 14 g/L, 15 g/L, 16 g/L, 17 g/L, 18 g/L, 19 g/L, 20 g/L, 21 g/L, 22 g/L, 23 g/L, 24 g/L, 25 g/L, 26 g/L, 27 g/L, 28 g/L, 29 g/L, 30 g/L, 31 g/L, 32 g/L, 33 g/L, 34 g/L, 35 g/L, 36 g/L, 37 g/L, 38 g/L, 39 g/L, 40 g/L, 31
- the carbon substrate like the nitrogen substrate, can be used for cell production and enzyme production, but unlike the nitrogen substrate, the carbon substrate can serve as the raw material for production of fermentation end-products. Frequently, more carbon substrate can lead to greater production of fermentation end-products. In another embodiment, it can be advantageous to operate with the carbon level and nitrogen level related to each other for at least a portion of the fermentation time.
- the ratio of carbon to nitrogen is maintained within a range of about 30: 1 to about 10: 1. In another embodiment, the ratio of carbon nitrogen is maintained from about 20: 1 to about 10: 1 or more preferably from about 15: 1 to about 10: 1.
- the ratio of carbon nitrogen is about 30: 1, 29: 1, 28: 1, 27: 1, 26:1, 25: 1, 24: 1, 23: 1, 22: 1, 21 : 1, 20: 1, 19: 1, 18: 1, 17: 1, 16: 1, 15:1, 14: 1, 13: 1, 12: 1, 11 : 1, 10: 1, 9: 1, 8: 1, 7: 1, 6: 1, 5: 1, 4: 1, 3: 1, 2: 1, or 1 : 1.
- Maintaining the ratio of carbon and nitrogen ratio within particular ranges can result in benefits to the operation such as the rate of metabolism of carbon substrate, which depends on the amount of carbon substrate and the amount and activity of enzymes present, being balanced to the rate of end product production. Balancing the carbon to nitrogen ratio can, for example, facilitate the sustained production of these enzymes such as to replace those which have lost activity.
- the amount and/or timing of carbon, nitrogen, or other medium component addition can be related to measurements taken during the fermentation.
- the amount of monosaccharides present, the amount of insoluble polysaccharide present, the polysaccharase activity, the amount of product present, the amount of cellular material (for example, packed cell volume, dry cell weight, etc.) and/or the amount of nitrogen (for example, nitrate, nitrite, ammonia, urea, proteins, amino acids, etc.) present can be measured.
- the concentration of the particular species, the total amount of the species present in the fermentor, the number of hours the fermentation has been running, and the volume of the fermentor can be considered.
- these measurements can be compared to each other and/or they can be compared to previous measurements of the same parameter previously taken from the same fermentation or another fermentation.
- Adjustments to the amount of a medium component can be accomplished such as by changing the flow rate of a stream containing that component or by changing the frequency of the additions for that component.
- the amount of saccharide can be increased when the cell production increases faster than the end product production.
- the amount of nitrogen can be increased when the enzyme activity level decreases.
- a fed batch operation can be employed, wherein medium components and/or fresh cells are added during the fermentation without removal of a portion of the broth for harvest prior to the end of the fermentation.
- a fed-batch process is based on feeding a growth limiting nutrient medium to a culture of microorganisms.
- the feed medium is highly concentrated to avoid dilution of the bioreactor.
- the controlled addition of the nutrient directly affects the growth rate of the culture and avoids overflow metabolism such as the formation of side metabolites.
- the growth limiting nutrient is a nitrogen source or a saccharide source.
- particular medium components can have beneficial effects on the performance of the fermentation, such as increasing the titer of desired products, or increasing the rate that the desired products are produced.
- Specific compounds can be supplied as a specific, pure ingredient, such as a particular amino acid, or it can be supplied as a component of a more complex ingredient, such as using a microbial, plant or animal product as a medium ingredient to provide a particular amino acid, promoter, co factor, or other beneficial compound.
- the particular compound supplied in the medium ingredient can be combined with other compounds by the organism resulting in a fermentation-beneficial compound.
- a medium ingredient provides a specific amino acid which the organism uses to make an enzyme beneficial to the fermentation.
- Other examples can include medium components that are used to generate growth or product promoters, etc. In such cases, it can be possible to obtain a fermentation-beneficial result by supplementing the enzyme, promoter, growth factor, etc. or by adding the precursor. In some situations, the specific mechanism whereby the medium component benefits the fermentation is not known, only that a beneficial result is achieved.
- a fermentation to produce a fuel is performed by culturing a strain of R. opacus in a medium having a supplement of lignin component and a
- the resulting production of end product such as TAG can be up to 1-fold, 2-fold, 3-fold, 4-fold, 5-fold, 6-fold, 7-fold, 8-fold, 9-fold, and in some cases up to 10-fold and higher in volumetric productivity than a process using only the addition of a relatively pure saccharide source, and can achieve a carbon conversion efficiency approaching the theoretical maximum.
- the theoretical maximum can vary with the substrate and product.
- the generally accepted maximum efficiency for conversion of glucose to ethanol is 0.51 g ethanol/g glucose.
- a biocatalyst can produce about 40-100% of a theoretical maximum yield of ethanol.
- a biocatalyst can produce up to about 40%, 50%>, 60%>, 70%>, 80%>, 90%, 95% and even 100% of the theoretical maximum yield of ethanol.
- a biocatalyst can produce up to about 1 %, 2 %, 3 %, 4 %, 5 %, 6 %, 7 %, 8 %, 9 %, 10 %, 11 %, 12 %, 13 %, 14 %, 15 %, 16 %, 17 %, 18 %, 19 %, 20 %, 21 %, 22 %, 23 %, 24 %, 25 %, 26 %, 27 %, 28 %, 29 %, 30 %, 31 %, 32 %, 33 %, 34 %, 35 %, 36 %, 37 %, 38 %, 39 %, 40 %, 41 %, 42 %, 43 %, 44 %, 45 %, 46 %, 47 %, 48
- Various embodiments offer benefits relating to improving the titer and/or productivity of fermentation end-product production by a biocatalyst by culturing the organism in a medium comprising one or more compounds comprising particular fatty acid moieties and/or culturing the organism under conditions of controlled pH.
- the pH of the medium is controlled at less than about pH
- the pH is controlled within a range of about pH 3.0 to about 7.1 or about pH 4.5 to about 7.1, or about pH 5.0 to about 6.3, or about pH 5.5 to about 6.3, or about pH 6.0 to about 6.5, or about pH 5.5 to about 6.9 or about pH 6.2 to about 6.7.
- the pH can be controlled by the addition of a pH modifier.
- a pH modifier is an acid, a base, a buffer, or a material that reacts with other materials present to serve to raise of lower the pH.
- more than one pH modifier can be used, such as more than one acid, more than one base, one or more acid with one or more bases, one or more acids with one or more buffers, one or more bases with one or more buffers, or one or more acids with one or more bases with one or more buffers.
- more than one pH modifiers are utilized, they can be added at the same time or at different times.
- one or more acids and one or more bases can be combined, resulting in a buffer.
- media components such as a carbon source or a nitrogen source can also serve as a pH modifier; suitable media components include those with high or low pH or those with buffering capacity.
- Exemplary media components include acid- or base-hydrolyzed plant polysaccharides having with residual acid or base, AFEX treated plant material with residual ammonia, lactic acid, corn steep solids or liquor.
- a constant pH can be utilized throughout the fermentation.
- the timing and/or amount of pH reduction can be related to the growth conditions of the cells, such as in relation to the cell count, the end product produced, the end product present, or the rate of end product production.
- the pH reduction can be made in relation to physical or chemical properties of the fermentation, such as viscosity, medium composition, gas production, off gas composition, etc.
- methods are provided for the recovery of the fermentive end products, such as an alcohol (e.g. ethanol, propanol, methanol, butanol, etc.) another bio fuel or chemical product.
- broth will be harvested at some point during of the fermentation, and fermentive end product or products will be recovered.
- the broth with end product to be recovered will include both end product and impurities.
- the impurities include materials such as water, cell bodies, cellular debris, excess carbon substrate, excess nitrogen substrate, other remaining nutrients, other metabolites, and other medium components or digested medium components.
- the broth can be heated and/or reacted with various reagents, resulting in additional impurities in the broth.
- the processing steps to recover end product frequently includes several separation steps, including, for example, distillation of a high concentration alcohol material from a less pure alcohol-containing material.
- the high concentration alcohol material can be further concentrated to achieve very high concentration alcohol, such as 98% or 99% or 99.5% (wt.) or even higher.
- Other separation steps, such as filtration, centrifugation, extraction, adsorption, etc. can also be a part of some recovery processes for alcohol as a product or biofuel, or other bio fuels or chemical products.
- a process can be scaled to produce commercially useful bio fuels.
- biocatalyst is used to produce an alcohol, e.g., ethanol, butanol, propanol, methanol, or a fuel such as hydrocarbons hydrogen, TAG, and hydroxy compounds.
- biocatalyst is used to produce a carbonyl compound such as an aldehyde or ketone ⁇ e.g. acetone, formaldehyde, 1-propanal, etc.), an organic acid, a derivative of an organic acid such as an ester ⁇ e.g.
- wax ester such as wax ester, glyceride, etc.
- 1, 2- propanediol 1, 3-propanediol
- lactic acid formic acid, acetic acid, succinic acid, pyruvic acid, or an enzyme such as a cellulase, polysaccharase, lipases, protease, ligninase, and hemicellulase.
- an enzyme such as a cellulase, polysaccharase, lipases, protease, ligninase, and hemicellulase.
- useful biochemicals can be produced from non-food plant biomass, with a steam or hot-water extraction technique that is carried out by contacting a charge of non-food plant pretreated biomass material such as corn stover or sorhum with water and/or acid (with or without additional process enhancing compounds or materials), in a pressurized vessel at an elevated temperature up to about 160 -220° C. and at a pH below about 7.0, to yield an aqueous (extract solution) mixture of useful sugars including long- chain saccharides (sugars), acetic acid, and lignin, while leaving the structural (cellulose and lignin) portion of the lignocellulosic material largely intact.
- non-food plant pretreated biomass material such as corn stover or sorhum
- water and/or acid with or without additional process enhancing compounds or materials
- these potential inhibitory chemicals especially sugar degradation products are low, and the plant derived nutrients that are naturally occurring lignocellulosic-based components are also recovered that are beneficial to a C5 and/or C6 fermenting organism.
- the aqueous extract is concentrated (by centrifugation, filtration, solvent extraction, flocculation, evaporation), by producing a concentrated sugar stream, apart from the other hemicellulose (C5 rich) and cellulosic derived sugars (C6 rich) which are channeled into a fermentable stream.
- one of the processes can comprise a milling of the carbonaceous material, via wet or dry milling, to reduce the material in size and increase the surface to volume ratio (physical modification).
- hydrolysis can be accomplished using acids, e.g.,
- Bronsted acids ⁇ e.g., sulfuric or hydrochloric acid
- bases e.g., sodium hydroxide
- hydrothermal processes e.g., ammonia fiber explosion processes ("AFEX")
- lime processes e.g., lime processes, enzymes, or combination of these.
- Hydrogen, and other end products of the fermentation can be captured and purified if desired, or disposed of, e.g., by burning.
- the hydrogen gas can be flared, or used as an energy source in the process, e.g., to drive a steam boiler, e.g., by burning.
- Hydrolysis and/or steam treatment of the biomass can, e.g., increase porosity and/or surface area of the biomass, often leaving the cellulosic materials more exposed to the biocatalyst cells, which can increase fermentation rate and yield.
- Removal of lignin can, e.g., provide a combustible fuel for driving a boiler, and can also, e.g., increase porosity and/or surface area of the biomass, often increasing fermentation rate and yield.
- the initial concentration of the carbohydrates in the medium is greater than 20 mM, e.g., greater than 30 mM, 50 mM, 75 mM, 100 mM, 150 mM, 200 mM, or even greater than 500 mM.
- a fuel or chemical plant that includes a pretreatment unit to prepare biomass for improved exposure and biopolymer separation, a hydrolysis unit configured to hydro lyze a biomass material that includes a high molecular weight carbohydrate, and one or more product recovery system(s) to isolate a product or products and associated by-products and co-products is provided.
- a product recovery system configured to isolate a product or products and associated by-products and co-products.
- methods of purifying lower molecular weight carbohydrate from solid byproducts and/or toxic impurities is provided.
- methods of making a product or products that include combining biocatalyst cells of a microorganism and a biomass feed in a medium wherein the biomass feed contains lower molecular weight carbohydrates and unseparated solids and/or other liquids from pretreatment and hydrolysis, and fermenting the biomass material under conditions and for a time sufficient to produce a biofuel, chemical product or fermentive end- products, e.g. ethanol, propanol, hydrogen, succinic acid, lignin, terpenoids, and the like as described above, is provided.
- a biofuel, chemical product or fermentive end- products e.g. ethanol, propanol, hydrogen, succinic acid, lignin, terpenoids, and the like as described above.
- products made by any of the processes described herein is also provided herein.
- One example is a method for producing chemical products from biomass by first treating biomass with an acid at elevated temperature and pressure in a hydrolysis unit.
- the biomass may first be heated by addition of hot water or steam.
- the biomass may be acidified by bubbling gaseous sulfur dioxide through the biomass that is suspended in water, or by adding a strong acid, e.g., sulfuric, hydrochloric, or nitric acid with or without preheating/presteaming/water addition.
- a strong acid e.g., sulfuric, hydrochloric, or nitric acid with or without preheating/presteaming/water addition.
- the pH is maintained at a low level, e.g., below about 5.
- the temperature and pressure may be elevated after acid addition.
- a metal salt such as ferrous sulfate, ferric sulfate, ferric chloride, aluminum sulfate, aluminum chloride, magnesium sulfate, or mixtures of these can be added to aid in the acid hydrolysis of the biomass.
- the acid-impregnated biomass is fed into the hydrolysis section of the pretreatment unit. Steam is injected into the hydrolysis portion of the pretreatment unit to directly contact and heat the biomass to the desired temperature.
- the temperature of the biomass after steam addition is, e.g., between about 130° C and 220° C.
- the acid hydrolysate is then discharged into the flash tank portion of the pretreatment unit, and is held in the tank for a period of time to further hydro lyze the biomass, e.g., into oligosaccharides and monomeric sugars. Other methods can also be used to further break down biomass. Alternatively, the biomass can be subject to discharge through a pressure lock for any high-pressure pretreatment process. Hydrolysate is then discharged from the pretreatment reactor, with or without the addition of water, e.g., at solids concentrations between about 10% and 60%.
- the biomass may be dewatered and/or washed with a quantity of water, e.g. by squeezing or by centrifugation, or by filtration using, e.g. a countercurrent extractor, wash press, filter press, pressure filter, a screw conveyor extractor, or a vacuum belt extractor to remove acidified fluid. Wash fluids can be collected to concentrate the C5 saccharides in the wash stream.
- the acidified fluid with or without further treatment, e.g. addition of alkali ⁇ e.g. lime) and or ammonia ⁇ e.g.
- ammonium phosphate can be re-used, e.g., in the acidification portion of the pretreatment unit, or added to the fermentation, or collected for other use/treatment.
- Products may be derived from treatment of the acidified fluid, e.g., gypsum or ammonium phosphate.
- Enzymes or a mixture of enzymes can be added during pretreatment to hydro lyze, e.g. endoglucanases,
- exoglucanases cellobiohydrolases (CBH), beta-glucosidases, glycoside hydrolases, glycosyltransferases, alphyamylases, chitinases, pectinases, lyases, and esterases active against components of cellulose, hemicelluloses, pectin, and starch, in the hydrolysis of high molecular weight components.
- CBH cellobiohydrolases
- beta-glucosidases glycoside hydrolases
- glycosyltransferases alphyamylases
- chitinases chitinases
- pectinases pectinases
- lyases lyases
- esterases active against components of cellulose, hemicelluloses, pectin, and starch active against components of cellulose, hemicelluloses, pectin, and starch, in the hydrolysis of high molecular weight components.
- a fermentor attached or at a separate site, can be fed with hydro lyzed biomass, any liquid fraction from biomass pretreatment, an active seed culture of a biocatalyst, such as a yeast, if desired a co-fermenting microbe, e.g., another yeast or E. coli, and, if required, nutrients to promote growth of the biocatalyst or other microbes.
- a biocatalyst such as a yeast
- a co-fermenting microbe e.g., another yeast or E. coli
- the pretreated biomass or liquid fraction can be split into multiple fermenters, each containing a different strain of a biocatalyst and/or other microbes, and each operating under specific physical conditions. Fermentation is allowed to proceed for a period of time, e.g., between about 1 and 150 hours, while maintaining a temperature of, e.g., between about 25° C and 50° C. Gas produced during the fermentation is swept from fermentor and is discharged, collected, or flared with or without additional processing, e.g. hydrogen gas may be collected and used as a power source or purified as a co-product.
- methods of making a fuel or fuels that include combining one or more biocatalyst and a lignocellulosic material (and/or other biomass material) in a medium, adding a lignin fraction from pretreatment, and fermenting the lignocellulosic material under conditions and for a time sufficient to produce a fuel or fuels, e.g., ethanol, propanol and/or hydrogen or another chemical compound is provided herein.
- a fuel or fuels e.g., ethanol, propanol and/or hydrogen or another chemical compound
- Example 1 Maintenance of DDGS levels.
- a 20% C6 solution is added to an 80%> corn mash for an SSF fermentation.
- the 80% corn mash slurry contains 30% solids which are comprised of 72% starch, 12-15%) glucan, oil and fiber about 7-10%.
- the oil and fiber, after the fermentation of the starch and glucan, constitutes what is called DDGS and can be sold as feed, primarily for cattle.
- the starch fermentation results in 21-22% sugars which can be converted to 10-11% ethanol.
- the solution is to add a greater concentration of the solids (36% solids instead of 30% solids) to the 80% corn mash solution.
- Corn mash cannot normally be fermented at a high solids content (36%>).
- DDGS yields can be maintained.
- 800 gallons of corn mash containing 36%> solids can be supplemented with 200 gallons of C6 solution containing 26-30% C6 sugar, to prevent loss of DDGS.
- the corn mash solution, that cannot be fermented as 36%> solids can be diluted to 30%> solids.
- the 3-4% increase in sugar can lead to a 1-2% increase in ethanol
- Non-food cellulosic feedstock is received and pre-processed.
- oversized materials example large chunks of wood
- contaminates for example stones, soil, etc.
- the remaining lignocellulosic material can be triturated (e.g., by chipping, tub grinding, hammer milling, or other available comminuting procedure) to reduce the feedstock to the preferred size and condition for further handling and processing.
- switch grass and ensiled energy sorghum was used. Switch grass was dried and hammer milled to reduce particle size. In the case of ensiled energy sorghum, the material was chopped and ensiled in a bunker. The water content of each biomass feedstock was determined and adjusted to a solids content of about 15% (wt/v) solids and moisture content of about 85% (wt/v) using a 24 hour soaking treatment.
- the solids portion may include some amount of C5 sugars
- the liquid stream may include some amount of C6 sugars.
- the liquid stream was then retained and maintained separate from the C6 stream.
- the separated solids were placed into a mixing tank. Once inside the mixing tank, the solids were adjusted to a pH of about 5 using 0.1 N NaOH. The solids wee then diluted to a dry solids content of about 8% solids. Enzymes (CELLIC CTech 2, Novozymes North America, Franklinton, NC) were added to the solid slurry at 2% loading (v/wt) based on the dry weight of the solids.
- Figure 1 is a sample sugar trajectory that illustrates how the biomass is converted from solids into liquefied stream of C6 sugars.
- Figure 1 was generated by collecting samples periodically for estimation (by HPLC) of cellulosic C6 sugars released by enzymatic hydrolysis of solids. Once enzymatic hydrolysis was complete, the liquid slurry is separated by centrifugation or micro filtration; or, alternatively, the solids can remain in the broth. For the experiments herein, the solids were separated from the broth using
- Novozymes was added at a dose of 0.025 % (w/w) based on the wet weight of the corn in the slurry.
- the slurries were sealed and mixed at 50 rpm. Samples were liquefied by incubating at 83°C for 90 minutes, after which the samples were cooled to 40° and the mass of mash was calculated. The pH of the mash was adjusted to ⁇ 5.2 by addition of 10 N sulfuric acid. The samples were shaken at 170 rpm at 32°C .
- Glucoamylase enzyme starch breakdown process for corn mash
- Spirizyme® Fuel Novozymes
- Antibiotic, Lactrol Philbro, Ridgefield Park, NH
- the resulting corn mash had a 30% glucose concentration (wt/vol).
- yeast Sacharomyces cerevisiae; Ethanol Red;
- Fermentis Marcqen-Baroeul, France
- Fermentis Marcqen-Baroeul, France
- Nitrogen as a 0.2 g/mL urea solution was added to a total concentration of nutrient nitrogen of 500 mg N/kg.
- the flasks were incubated at 32°C at 170 rpm for 60-120 hours.
- a dextrose fermentation was run as a control.
- sugar compositions derived from ensiled energy sorghum and switch grass were prepared in accordance with Example 2.
- the cellulosic hydrolysate derived from sorghum and switchgrass comprise approximately 20%> (wt/v) C6 sugars.
- Various blending ratios of corn mash starch C6 with cellulosic C6 were prepared as follows: For every 100 ml of total whole fermentation broth, the amount of corn mash to cellulosic sugar C6 sugars was blended such that the final concentration of the sugars remained close to 20%.
- the sorghum sugar streams were characterized for total solids, total dissolved solids and HPLC analysis of sugar content.
- concentrations of total dry solids and dissolved dry solids were measured using standard fermentation procedures.
- the sugar substrate concentration was analyzed by HPLC for cellobiose, glucose, xylose, galactose, arabinose and mannose.
- Table 1 and Figure 2 illustrate the approximate percent gain in ethanol yield over corn mash control in fermentation.
- the 80:20 corn mash blend with energy sorghum showed a 20.71% increase in ethanol conversion rate
- the 70:30 corn mash blend with energy sorghum showed a 12.05% increase in ethanol conversion rate
- the 60:40 corn mash blend with energy sorghum showed a 16.72% increase in ethanol conversion rate
- the 50:50 corn mash blend with energy sorghum showed a 11.99% increase in ethanol conversion rate.
- Switchgrass cellulosic sugar was blended with corn mash to produce 80:20 and 50:50 corn mash: switchgrass ratio samples.
- Table 2 and Figure 5 illustrate the percent gain in ethanol yield over the corn mash control during yeast fermentation.
- the 80:20 corn mash/switchgrass blend produced a 3.14% rise in ethanol conversion rate
- the 50:50 corn mash blend with switchgrass demonstrated a 6.95% rise in ethanol conversion rate.
- the level of nutrient rich ions present in the cellulosic hydrolysate stream enables the yeast to more efficiently and effectively consume glucose.
- Other mechanisms may also contribute to the observed beneficial effect: 1) appropriate levels of salt (ash) that alter membrane permeability or transport proteins, allowing more glucose into the cell and therefore more ethanol production; 2) appropriate (low) levels of inhibitors may reduce protons on the exterior of the
- Example 7 Preparation of Corn Stover used for Corn Mash Blending
- Corn stover was processed through a steam pretreatment system using only steam and no additional catalysts to prepare a C6-enriched hydrolysate.
- the pretreatment temperature was 205°C and the resident time was about 7.5 minutes. Excess C5 sugars and acetic acid that were generated during pretreatment were solubilized and removed using a filter press.
- the stover was then added to a 55 gallon jacketed reactor and total solids were brought to about 8% (wt/wt) using water.
- the pH of the corn stover was adjusted to about 5.0 using sodium hydroxide.
- the 8% slurry of corn stover contained approximately 5 kg of dry biomass. To this, 1 L of enzymes were added to the broth. This represented
- Example 8 Corn Mash Blending with Cellulosic Sugar derived from Corn Stover
- Corn mash oligosaccharides e.g., starch
- Corn mash oligosaccharides e.g., starch
- sugars was blended with monomeric C6 sugar under various fermentation conditions.
- the monomeric sugars comprised either a solution of pure glucose or a C6-enriched hydro lysate produced from corn stover (e.g., cellulosic sugars) according to the procedure in Example 7. Both sources of monomeric sugars comprised about 25%> sugars.
- the blended feedstocks were then simultaneously saccharified and fermented using a combination of enzymes and yeast.
- the corn mash control undiluted, was saccharified and fermented as is.
- either 80 or 90 grams of corn mash material was weighed out and funneled into the appropriate flask.
- 20 or 10 mL of either a ⁇ 25%> sterile solution of glucose or ⁇ 25%> corn stover hydro lysate was added to the corn mash and mixed.
- Fermentations comprising only pure glucose or the corn stover hydro lysate, had 1 mL of Yeast Nutrient Media added.
- Magnesium sulfate solution was added to all samples prior to fermentation, and the pH of each solution was adjusted to 4.8 - 5.2.
- Yeast propagated beforehand to exponential growth phase, was added to each sample.
- 50 of glucoamylase was added at the same time to initiate the simultaneous saccharification of the corn mash and the yeast fermentation.
- Samples of the fermentation were analyzed at 2.5, 5, 24, and 96 hours for glucose and ethanol. The results are summarized in Table 4.
- Control fermentations were carried out with pure glucose solution or the C6- enriched corn stover hydrolysate.
- the concentration of sugars in the fermentation reactions was approximately 20%.
- the glucose and the C6 hydrolysate produced similar yields of ethanol.
- the pure glucose fermentation produced an ethanol titer of 105.54 g/L after 96 hours; the C6-enriched hydrolysate fermentation reaction produced an ethanol titer of 104.03 g/L after 96 hours. This experiment shows that the C6-enriched hydrolysate yields are similar to a pure glucose solution.
- Example 9 Fed Batch fermentation using Blended Cellulosic-derived and non-Cellulosic Sugars
- glucoamylase a fermenting yeast in a single vessel.
- the success of this operation can be determined and driven by several factors such as the starch content in the mash leading to total fermentable sugars (e.g., the higher the sugar content, the higher the amount of ethanol produced); the kind of yeast used (sugar, ethanol and temperature tolerant); the inoculum level of the yeast and fermentation time; the residual sugars at the end of fermentation (most corn ethanol plants prefer to maximize sugar utilization and minimize the presence of residual sugars as it impacts the quality of DDGS on distillation); temperature; the control of the release and presence of monomeric C6 sugars and salts during fermentation; the level of fermentation inhibitors formed (e.g., acetic acid, lactic acid, formic acid, HMF, furfural and lignin produced); the presence of C5 sugars and
- glucose levels are kept low to reduce osmotic stress on the yeast, especially past 18 -24 hours of fermentation when other stressors may begin to impact the yeast (e.g., ethanol, lactic acid, acetic acid, etc.).
- Dosing GA at a higher concentration typically results 3-5% glucose at 24 hours; however by reducing the GA, a reduction in the glycerol production (presumably from less osmotic stress) is noticed.
- the moisture content of the corn was used to determine the mass of corn needed to prepare mash at a dry-solids concentration of 25 % (w/w).
- the alpha-amylase enzyme (Liquozyme SC DS, Novozymes, U.S.A.) was diluted to ensure more precise delivery of enzyme to each sample.
- a 0.13-g/ml working solution of the alpha amylase was added at a dose of 0.025 % (w/w) based on the wet weight of the corn.
- the pH was adjusted to 5.7 - 5.85 using IN ammonium hydroxide and the samples agitated while incubating at 83° C for 90 minutes. Following liquidation of the samples, they were cooled to 40° C.
- the cellulosic C6 rich stream derived from various feedstocks e.g., corn stover, wheat straw, energy sorghum, switchgrass, etc.
- feedstocks e.g., corn stover, wheat straw, energy sorghum, switchgrass, etc.
- the fermentations were performed with crude hydrolysates that were characterized for total solids, total dissolved solids and HPLC analysis of sugar content. The concentrations of total dry solids and dissolved dry solids were measured using standard NREL procedures. The sugar substrate concentration was analyzed by HPLC for C5 sugars and glucose as C6.
- a C6 rich stream was prepared from processing corn stover that was pretreated in a commercial Biogasol unit capable of processing 100MT dry biomass per day with dilute H 2 SO 4 (15 minutes at 170° C with 0.6%, H 2 SO 4 ).
- the C5 sugars were separated and the C6 /lignin rich solids were enzyme hydrolyzed with Novozyme Cellic Ctec3 cellulase enzymes.
- Post hydrolysis the lignin was separated and the C6 rich stream with a residual amount of C5 was further concentrated to 25% solubilized solids.
- yeast Sacharomyces cerevisiae; FermaxGreen and
- FermaxGold Ethanol Red Fermentis, Marcq-en-Baroeul, France
- FermaxGold Ethanol Red Fermentis, Marcq-en-Baroeul, France
- Table 6 Summary design of cellulosic-C6 rich stream to water ratio per treatment for determination of effects on ethanol yield SOLUTION: CORN MASH SLURRY
- Samples were collected at various time intervals and the combined mass of the mash and sample was measured. The samples were analyzed for concentrations of substrates (glucose, subunits, residual xylose) and products (ethanol, glycerol, lactic acid, and acetic acid) by HPLC. The remaining samples were collected at the end of fermentation and analyzed for pH and substrate/product concentrations. The final concentrations of total dry solids and dissolved dry solids were measured after incubation for 62 hours
- Samples were drawn at time intervals and analyzed for residual sugars and progress of ethanol fermentations.
- an engineered yeast that was capable of fermenting C6 glucose and C5 sugar (xylose) was used. The intent was to test and see if mixed cultures of C6 and an engineered C5 fermenting yeast assist in
- Combining cellulosic derived C6 sugar with corn mash as a fed batch process produces higher ethanol production in a shorter amount of time over the first portion of the fermentation in the 30L and flask samples.
- the fed batch process not only has shown an increase in ethanol production compared to corn mash on its own, it has also shown to be superior to batch process where all of the cellulosic sugar in the blend is added initially in fermentation. Further optimization with the mixed culture of C6 and C5 fermenting yeast in the 30L reactor resulted in higher ethanol titers (25%) and reduced the amount of residual sugar in solution, especially in the remaining C5 portion.
- Figure 8 shows that by feeding a higher concentration of cellulosic sugar over time, higher ethanol production can be achieved when cellulosic sugar is blended with corn mash after 48 hours and in a shorter amount of time. Residual sugar in both fermentations was under 0.13% v/v. The C5 portion of solution remained mostly unfermented due to the lack of C5 fermenting microbe.
- Figure 9 shows the amount of ethanol produced in a 90: 10 blend of corn mash and cellulosic sugar at the shake flask level vs. the ethanol production in standard corn mash from as is, at an industrial size scale.
- the addition of cellulosic sugar throughout the fermentation can account for the increase in ethanol production at the beginning of the fermentation.
- Figure 10 illustrates the results of fed batch replacement of 10% of the corn mash with 10%> concentrated cellulosic sugar solution (52% total C5 and C6 sugar). There was an increase of 4.75% v/v ethanol by this method than with corn mash without any blending. The standard yeast combined with a C5 and C6 fermenting yeast strain led to a higher ethanol yield.
- Figure 11 shows the percent increase in ethanol production between the 90: 10 and 80:20 blended flasks of corn mash with cellulosic sugar derived from wheat straw.
- the 90: 10 fed batch run had a 24.63% increase in ethanol production compared to the batch run in a 90: 10 ratio.
- the 80:20 fed batch blend also saw positive improvement, yielding 12% of an ethanol increase compared to the batch run in the same blend.
- C6 Saccharide Stream starch-derived C6 saccharides
- Fermentation reaction progress was measured by mass loss, ethanol concentration, and ethanol yield. The data show statistically significant increases in mass loss, ethanol concentrations and yield for doses above 10% C6 Saccharide Stream. For the higher doses, the total residual sugars concentration may indicate an incomplete fermentation.
- An objective of this example is to determine how different proportions of a C6
- Saccharide Stream added to corn mash affect the ethanol yield.
- QC quality control
- Hot water at about 190 °F was added to corn stillage material until the total solids level was about 12%.
- the mixture was continuously agitated at about 185 °F for about 90 min, then the pH was adjusted to about 5.8 with sodium hydroxide.
- the corn stillage material was treated with alpha amylase amylase enzymes and glucoamylase enzymes. Solids were sequestered by filter press and the liquid fraction was concentrated to about 25% glucose (w/v) by evaporation.
- the moisture of the ground corn was determined gravimetrically by drying a subsample of the flour in a forced-air oven at 105 °C for 3 hours.
- the moisture content for corn used the first week was 14.04 %> (w/w, as received) and for week two it was 14.35 % (w/w, as received).
- the moisture content of the corn was used to determine the mass of corn needed to prepare 160 g of mash at a dry-solids concentration of 25 %> (w/w).
- a 0.13 g/mL working solution of the alpha amylase was used and added at a dose of 0.025 % (w/w) based on the wet weight of the corn.
- the slurries were hand swirled after all components were in the Labomat beakers.
- the pH was adjusted to 5.7 - 5.85 using 6N ammonium hydroxide.
- Sealed beakers were attached to a vertically mounted wheel in the Labomat (Model BFL12 805, Mathis, Switzerland), which rotated at 50 rpm during the incubation. The wheel was programmed to reverse direction every 50 seconds to improve the mixing efficiency.
- yeast Sacharomyces cerevisiae; Ethanol Red;
- Fermentis Marcq-en-Baroeul, France
- This suspension was incubated and mixed for 20 minutes at 40 °C before inoculation into the fermentation flasks.
- Each fermentation flask was inoculated with 160 ⁇ of the yeast suspension to attain an initial concentration of 1 x 10 7 yeast cells/mL.
- Samples were prepared for HPLC by centrifugation to remove large solids, followed by filtration through 0.45 ⁇ syringe filters, and acidification to pH of approximately 2 by addition of sulfuric acid to a final concentration of 0.01 N. The final concentrations of total dry solids and dissolved dry solids were measured after incubation for 62 hours, and the density of the beer filtrate was measured by densitometer (Anton Paar DMA 4500, Anton-Paar GmbH, Graz, Austria).
- Fermentation progress curves are shown in Figure 12 (A&B) and the average mass losses for all treatments at all time points are shown in Table 11.
- the cumulative mass losses after incubation for 15.67 and 62 firs are shown in Figure 13.
- Significant differences in the average reaction progress after 15.67 and 62 hours were identified among the eight treatments using one-way ANOVA at the 95% confidence level. Further analysis by
- Table 13 shows the final product yields and residual sugar levels for each of the replicate samples in the treatment categories.
- Table 14 shows the final product yields and residual sugar levels averaged over all replicate samples in the treatment categories.
- Table 15 shows the mass loss at 15.67, 22, 39, 46, and 62 hours of fermentation for each of the replicates within the treatment conditions.
- Table 16 shows the pH for each of three replicates within each treatment condition at 22, 46, and 62 hours of fermentation.
- Ci concentration of compound "i"
- Ci concentration of compound "i"
- Saccharide Stream to corn mash on ethanol production The criteria evaluated to determine the effect of these additions were mass loss, ethanol concentration, and ethanol yield.
- Residual sugars and glycerol were also evaluated for each treatment in order to get a clearer picture of the overall process, especially in regards to optimization of the C6 Saccharide Stream amendment dose for corn-to-ethanol fermentations.
- Figure 9 shows a dose response plot of the increase in ethanol yield and the residual sugar levels for the treatment conditions tested. Taking into consideration the uncertainty on the measurements, these data suggest that a dose between 35% and 45% of C6 Saccharide Stream may perform the best in a fuel ethanol fermentation.
- the solids were then separated via filtration from the liquid stream to produce the C5 + C6 Lignin Stream at about 20% solids (w/w).
- the liquid stream at this point contains C5 and C6 monosaccharides .
- the liquid stream was then concentrated via evaporation to the desired monosaccharide levels to produce the C5 + C6 Saccharides Stream.
- the C5 + C6 Saccharides stream contained about 18.7% C6 and about 6.8%) C5 saccharides.
- Pretreated corn stover containing about 30%> solids was used to create the C5 saccharides stream.
- hot water at about 50°C
- the biomass and hot water solution was mixed for about 15 minutes at about 50°C.
- the solids were then filtered out and the liquid fraction was collected. The liquid fraction was then sequestered.
- the solids were then recollected and re-washed with the same ratio of hot water (at about 50°C) and mixed for about 15 minutes at about 50°C.
- the solids were then once again filtered out and the liquid fraction was collected and sequestered.
- the liquid fraction from the second wash was then combined with the liquid fraction from the first wash and the entire liquid fraction was concentrated via evaporation to the desired saccharide levels, yielding the C5 Saccharides Stream.
- the C5 Saccharides Stream contained about 12.9% C5 saccharides and about 1.3 % C6 saccharides.
- the C6 Saccharides Stream and C6 Lignin Stream are produced from the solids sequestered during production of the C5 Saccharide Stream.
- the solids were placed into a jacketed kettle with an agitator. Water was added to the pretreated solids to create an about 10%) solids solution (w/v).
- the temperature of the pretreated corn stover was then brought up to about 50°C.
- the pH was adjusted using ammonium hydroxide to about 5.0. Once pH and temperature were both set, cellulase enzymes (Celtech 3 cellulase from
- Novozyme were added to the solids at a dosing of about 5%> of total dry solids (wt/wt).
- the solution was kept at about 50°C, a pH of about 5.0 and at constant agitation for about 72 hours.
- the solids were then separated from the liquid stream via filtration to produce the C6 Lignin Stream at about 20% solids.
- the liquid stream at this point is enriched for C6 monosaccharides.
- the liquid stream was then concentrated via evaporation and vacuum to the desired saccharide levels to produce the C6 Saccharide Stream.
- the C6 Saccharide Stream contained about 25.1% C6 saccharides and about 2.6% C5 Sugars.
- yeast fermentations are performed using 80:20 blends of corn mash and a C6 Saccharide Stream produced from corn stover or an equivalent amount of pure sugars.
- the corn mash was prepared according as in Example 10 and had a glucose concentration of about 30% (w/v).
- the post-treated material which comprised about 25%o to about 30%> solids [wt/v] was subjected to a water washing step to separate solubilized C5 saccharides from C6 Saccharides (the C5 saccharide stream includes some amount of C6 from glycan hydrolysis "impurity").
- the washing was performed in two steps; in the first step, the post- treated feedstock was separated by filter press to separate the solids from the liquid stream containing the C5 saccharides.
- the solid material was further suspended in water to recover additional C5 saccharides which may have remained in the separated solids portion.
- the remaining solids contained the cellulose (C6 saccharides).
- the liquid stream was then retained and kept separate from the solids.
- the separated solids were placed into a mixing tank. Once inside the mixing tank, the solids were adjusted to a pH of about 5 using 0.1 N Sodium Hydroxide. The solids were then diluted with water to about 10% solids. An enzyme cocktail (CELLIC CTech 2, Novozymes) was then added to the solid slurry. The amount of the enzyme added to the mixture was 2%> loading (v/wt) based on the dry weight of the solids. The slurry was mixed at 50°C continuously for 72 hours. [00310] Once enzymatic hydrolysis was complete, the liquid slurry was separated by centrifugation or micro filtration; or, alternatively, the solids can remain in the broth.
- An enzyme cocktail CELLIC CTech 2, Novozymes
- the solids were separated from the broth using evaporation.
- a lab-scale evaporation set up in Buchi R220SE evaporator was used.
- About 30 L of the resultant C6- rich liquid slurry was concentrated by simple evaporation at a temperature of 60 degrees C until the sugar content of the Corn Stover hydro lysate (C6 Saccharide Stream) was raised from about 5% to about 25% w/v.
- the resulting composition had a C6 saccharide: C5 saccharide ratio of about 90: 10.
- Each flask contained a total of 275 g of fermentation substrate made up of 220 g of corn mash and 55 g of the C6 Saccharide Stream containing 25.4% glucose & 4.3% xylose or a stock solution of the same sugar concentrations.
- Additional fermentation additives included 0.5 mL of a 40% urea solution, 0.305 mL of a 1 : 10 dilution of Spirozym Ultra XHS delivered at 0.036%) w/w, 0.245 mL of a 1 : 100 dilution of protease, 0.1 mL of a 1 : 100 dilution of phytase, and a scoop ofV50.
- yeast fermentations are performed using 80:20 blends of corn mash C6 Saccharide Stream produced from corn stover or an equivalent amount of pure sugars.
- the corn mash and C6 Saccharide Streams were prepared as in Example 12.
- Each flask contained a total of 275 g of fermentation substrate made up of 220 g of corn mash and 55 g of the C6 Saccharide Stream containing 25.4% glucose & 4.3% xylose or a stock solution of the same sugar concentrations.
- Additional fermentation additives included 0.5 mL of a 40% urea solution, 0.305 mL of a 1 : 10 dilution of Spirozym Ultra XHS delivered at 0.036%) w/w, 0.245 mL of a 1 : 100 dilution of protease, 0.1 mL of a 1 : 100 dilution of phytase, and a scoop ofV50.
- Blank cells represent machine errors and are excluded from the average values.
- yeast fermentations are performed to compare a corn mash only fermentation with a 70:30 blend of corn mash and a C6 Saccharide Stream produced from corn stover.
- the corn mash and C6 Saccharide Stream were produced as in Example 12.
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NZ628790A NZ628790A (en) | 2012-02-10 | 2013-02-08 | Enhancing fermentation of starch-and sugar-based feedstocks |
AU2013216823A AU2013216823B2 (en) | 2012-02-10 | 2013-02-08 | Enhancing fermentation of starch-and sugar-based feedstocks |
EP13747149.6A EP2812437A4 (en) | 2012-02-10 | 2013-02-08 | Enhancing fermentation of starch-and sugar-based feedstocks |
BR112014019356A BR112014019356A8 (en) | 2012-02-10 | 2013-02-08 | METHOD FOR PRODUCING ONE OR MORE FINAL FERMENTATION PRODUCTS AND FINAL FERMENTATION PRODUCT |
CA2864144A CA2864144A1 (en) | 2012-02-10 | 2013-02-08 | Enhancing fermentation of starch-and sugar-based feedstocks |
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US61/648,567 | 2012-05-17 | ||
US201261662339P | 2012-06-20 | 2012-06-20 | |
US61/662,339 | 2012-06-20 | ||
US13/731,633 | 2012-12-31 | ||
US13/731,633 US8765430B2 (en) | 2012-02-10 | 2012-12-31 | Enhancing fermentation of starch- and sugar-based feedstocks |
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Cited By (5)
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US10844413B2 (en) | 2014-12-09 | 2020-11-24 | Sweetwater Energy, Inc. | Rapid pretreatment |
RU2779866C2 (en) * | 2016-12-23 | 2022-09-14 | Роквул Интернэшнл А/С | Compact body |
CN115678920A (en) * | 2022-12-05 | 2023-02-03 | 华南农业大学 | Method for fermenting ethanol by using high-solid-content cellulose |
US11692000B2 (en) | 2019-12-22 | 2023-07-04 | Apalta Patents OÜ | Methods of making specialized lignin and lignin products from biomass |
US11821047B2 (en) | 2017-02-16 | 2023-11-21 | Apalta Patent OÜ | High pressure zone formation for pretreatment |
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RU2432368C2 (en) * | 2005-07-19 | 2011-10-27 | Инбикон А/С | Method of converting cellulose material to ethanol |
BRPI0812427A2 (en) * | 2007-06-08 | 2014-12-30 | Novozymes North America Inc | METHOD FOR PARODUCTING A MATERIAL FERMENTATION PRODUCT CONTAINING LIGNOCELLULOSIS, AND PROCESS TO PRODUCE A FERMENTATION PRODUCT OF A COMBINATION OF STARK CONTAINING MATERIAL AND MATERIAL CONTAINING LIGNOCELLULOSIS. |
-
2013
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- 2013-02-08 BR BR112014019356A patent/BR112014019356A8/en not_active IP Right Cessation
- 2013-02-08 NZ NZ628790A patent/NZ628790A/en not_active IP Right Cessation
- 2013-02-08 WO PCT/US2013/025457 patent/WO2013120035A1/en active Application Filing
- 2013-02-08 EP EP13747149.6A patent/EP2812437A4/en not_active Withdrawn
- 2013-02-08 CA CA2864144A patent/CA2864144A1/en not_active Abandoned
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US20050272134A1 (en) * | 2002-08-05 | 2005-12-08 | Jonathan Hughes | Production of a fermentation product |
JP2006149343A (en) * | 2004-11-26 | 2006-06-15 | Daitoo Fujitekku:Kk | Glucose product from wood-based biomass and method for producing glucose product |
US20090098617A1 (en) * | 2007-10-10 | 2009-04-16 | Murray Burke | Enzymatic treatment under vacuum of lignocellulosic materials |
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US10844413B2 (en) | 2014-12-09 | 2020-11-24 | Sweetwater Energy, Inc. | Rapid pretreatment |
RU2779866C2 (en) * | 2016-12-23 | 2022-09-14 | Роквул Интернэшнл А/С | Compact body |
US11821047B2 (en) | 2017-02-16 | 2023-11-21 | Apalta Patent OÜ | High pressure zone formation for pretreatment |
US11692000B2 (en) | 2019-12-22 | 2023-07-04 | Apalta Patents OÜ | Methods of making specialized lignin and lignin products from biomass |
CN115678920A (en) * | 2022-12-05 | 2023-02-03 | 华南农业大学 | Method for fermenting ethanol by using high-solid-content cellulose |
CN115678920B (en) * | 2022-12-05 | 2023-09-26 | 华南农业大学 | Method for fermenting ethanol by high-solid-content cellulose |
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BR112014019356A8 (en) | 2017-07-11 |
AU2013216823B2 (en) | 2017-05-18 |
BR112014019356A2 (en) | 2017-06-20 |
NZ628790A (en) | 2016-11-25 |
EP2812437A4 (en) | 2015-10-28 |
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AU2013216823A1 (en) | 2014-09-04 |
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