Classifications

• • 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
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
  • C07K14/37—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from fungi
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
  • C11B1/00—Production of fats or fatty oils from raw materials
  • C11B1/02—Pretreatment
  • C11B1/025—Pretreatment by enzymes or microorganisms, living or dead
• • 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
  • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
  • C12N9/14—Hydrolases (3)
  • C12N9/24—Hydrolases (3) acting on glycosyl compounds (3.2)
  • C12N9/2402—Hydrolases (3) acting on glycosyl compounds (3.2) hydrolysing O- and S- glycosyl compounds (3.2.1)
  • C12N9/2405—Glucanases
  • C12N9/2408—Glucanases acting on alpha -1,4-glucosidic bonds
  • C12N9/2411—Amylases
  • C12N9/2414—Alpha-amylase (3.2.1.1.)
• • 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
  • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
  • C12N9/14—Hydrolases (3)
  • C12N9/24—Hydrolases (3) acting on glycosyl compounds (3.2)
  • C12N9/2402—Hydrolases (3) acting on glycosyl compounds (3.2) hydrolysing O- and S- glycosyl compounds (3.2.1)
  • C12N9/2405—Glucanases
  • C12N9/2408—Glucanases acting on alpha -1,4-glucosidic bonds
  • C12N9/2411—Amylases
  • C12N9/2414—Alpha-amylase (3.2.1.1.)
  • C12N9/2417—Alpha-amylase (3.2.1.1.) from microbiological source
  • C12N9/242—Fungal source
• • 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
  • C12P19/00—Preparation of compounds containing saccharide radicals
  • C12P19/14—Preparation of compounds containing saccharide radicals produced by the action of a carbohydrase (EC 3.2.x), e.g. by alpha-amylase, e.g. by cellulase, hemicellulase
• • 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
  • C12P19/00—Preparation of compounds containing saccharide radicals
  • C12P19/20—Preparation of compounds containing saccharide radicals produced by the action of an exo-1,4 alpha-glucosidase, e.g. dextrose
• • C—CHEMISTRY; METALLURGY
  • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
  • C12Y—ENZYMES
  • C12Y302/00—Hydrolases acting on glycosyl compounds, i.e. glycosylases (3.2)
  • C12Y302/01—Glycosidases, i.e. enzymes hydrolysing O- and S-glycosyl compounds (3.2.1)
  • C12Y302/01001—Alpha-amylase (3.2.1.1)
• • 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

• the present invention relates to methods for enhancing the yield of oil and/or the quality of by-products from fermentation processes to produce fermentation products.
• Processes for producing fermentation products, such as ethanol, from a starch or lignocellulose containing material are well known in the art.
• the preparation of the starch-containing material such as corn for utilization in such fermentation processes typically begins with grinding the corn in a dry-grind or wet-milling process.
• Wet-milling processes involve fractionating the corn into different components where only the starch fraction enters into the fermentation process.
• Dry-grind processes involve grinding the corn kernels into meal and mixing the meal with water and enzymes. Generally two different kinds of dry-grind processes are used.
• the most commonly used process includes grinding the starch-containing material and then liquefying gelatinized starch at a high temperature using typically a bacterial alpha-amylase, followed by simultaneous saccharification and fermentation (SSF) carried out in the presence of a glucoamylase and a fermentation organism.
• SSF simultaneous saccharification and fermentation
• Another well known process often referred to as a “raw starch hydrolysis” process (RSH process) includes grinding the starch-containing material and then simultaneously saccharifying and fermenting granular starch below the initial gelatinization temperature typically in the presence of an acid fungal alpha-amylase and a glucoamylase.
• a process for producing ethanol from corn following SSF or the RSH process the ethanol is distilled from the whole mash after fermentation.
• the resulting ethanol-free slurry usually referred to as whole stillage, is separated into solid and liquid fractions (i.e., wet cake and thin stillage containing about 35 and 7% solids, respectively).
• the thin stillage is often condensed by evaporation into a thick stillage or syrup and recombined with the wet cake and further dried into distillers' dried grains with solubles distillers' dried grain with solubles (DDGS) for use in animal feed.
• DDGS solubles
• the oil content of DDGS is sometimes higher than desired and methods of recovering more oil as a separate by-product for use in biodiesel production or other biorenewable products are sought.
• U.S. Pat. No. 6,433,146 discloses extracting oil and zein from corn or corn processing by-products using ethanol.
• U.S. Pat. No. 7,601,858 discloses a method for recovering oil from a concentrated byproduct, such as thin stillage formed during a dry milling process used for producing ethanol.
• the method includes forming a concentrate from the byproduct, e.g., by evaporating the by-product, and recovering oil from the concentrate.
• U.S. Pat. No. 7,608,729 discloses a method of freeing the bound oil present in whole stillage and thin stillage by heating the stillage to a temperature sufficient to at least partially separate, or bind, the oil from the stillage.
• U.S. Application Publication No. 2010/0058649 discloses a method of separating an oil fraction from a fermentation product, adjusting the pH of the oil fraction, and recovering the oil from the oil fraction.
• the present invention relates to a process of fermenting a starch-containing material into a fermentation product comprising a fermentation step in the presence of a hemicellulase(s) and/or an endoglucanase(s).
• the present invention also relates to a method of increasing the amount of oil recovered from a process for producing a fermentation product.
• the present invention also relates to a method of dewatering stillage obtained from a process for producing a fermentation product.
• the present invention also relates to a method of decreasing the amount of fat or oil in the distillers' dried grains with solubles (DDGS) produced in a process for producing a fermentation product.
• DDGS distillers' dried grains with solubles
• the present invention also relates to a method of increasing the amount of oil partitioned into the thin stillage produced by a process for producing a fermentation product.
• the present invention also relates to a method of dewatering the whole stillage produced by a process for producing a fermentation product.
• Acetylxylan esterase means a carboxylesterase (EC 3.1.1.72) that catalyzes the hydrolysis of acetyl groups from polymeric xylan, acetylated xylose, acetylated glucose, alpha-napthyl acetate, and p-nitrophenyl acetate.
• acetylxylan esterase activity is determined using 0.5 mM p-nitrophenylacetate as substrate in 50 mM sodium acetate pH 5.0 containing 0.01% TWEENTM 20.
• One unit of acetylxylan esterase is defined as the amount of enzyme capable of releasing 1 micromole of p-nitrophenolate anion per minute at pH 5, 25° C.
• Alpha-Amylases means an alpha-1,4-glucan-4-glucanohydrolase (E.C. 3.2.1.1) that catalyzes the hydrolysis of starch and other linear and branched 1,4-glucosidic oligo- and polysaccharides.
• Alpha-L-arabinofuranosidase means an alpha-L-arabinofuranoside arabinofuranohydrolase (EC 3.2.1.55) that catalyzes the hydrolysis of terminal non-reducing alpha-L-arabinofuranoside residues in alpha-L-arabinosides.
• the enzyme acts on alpha-L-arabinofuranosides, alpha-L-arabinans containing (1,3)- and/or (1,5)-linkages, arabinoxylans, and arabinogalactans.
• Alpha-L-arabinofuranosidase is also known as arabinosidase, alpha-arabinosidase, alpha-L-arabinosidase, alpha-arabinofuranosidase, polysaccharide alpha-L-arabinofuranosidase, alpha-L-arabinofuranoside hydrolase, L-arabinosidase, or alpha-L-arabinanase.
• alpha-L-arabinofuranosidase activity is determined using 5 mg of medium viscosity wheat arabinoxylan (Megazyme International Ireland, Ltd., Bray, Co.
• Alpha-glucuronidase means an alpha-D-glucosiduronate glucuronohydrolase (EC 3.2.1.139) that catalyzes the hydrolysis of an alpha-D-glucuronoside to D-glucuronate and an alcohol.
• alpha-glucuronidase activity is determined according to de Vries, 1998 , J. Bacteriol. 180: 243-249.
• One unit of alpha-glucuronidase equals the amount of enzyme capable of releasing 1 micromole of glucuronic or 4-O-methylglucuronic acid per minute at pH 5, 40° C.
• Beta-glucosidase means a beta-D-glucoside glucohydrolase (E.C. 3.2.1.21), which catalyzes the hydrolysis of terminal non-reducing beta-D-glucose residues with the release of beta-D-glucose.
• beta-glucosidase activity is determined according to the basic procedure described by Venturi et al., 2002, Extracellular beta-D-glucosidase from Chaetomium thermophilum var. coprophilum : production, purification and some biochemical properties, J. Basic Microbiol. 42: 55-66.
• beta-glucosidase is defined as 1.0 micromole of p-nitrophenolate anion produced per minute at 25° C., pH 4.8 from 1 mM p-nitrophenyl-beta-D-glucopyranoside as substrate in 50 mM sodium citrate containing 0.01% TWEEN® 20.
• Beta-xylosidase means a beta-D-xyloside xylohydrolase (E.C. 3.2.1.37) that catalyzes the exo-hydrolysis of short beta (1 ⁇ 4)-xylooligosaccharides, to remove successive D-xylose residues from the non-reducing termini.
• one unit of beta-xylosidase is defined as 1.0 micromole of p-nitrophenolate anion produced per minute at 40° C., pH 5 from 1 mM p-nitrophenyl-beta-D-xyloside as substrate in 100 mM sodium citrate containing 0.01% TWEEN® 20.
• Cellobiohydrolase means a 1,4-beta-D-glucan cellobiohydrolase (E.C. 3.2.1.91) that catalyzes the hydrolysis of 1,4-beta-D-glucosidic linkages in cellulose, cellooligosaccharides, or any beta-1,4-linked glucose containing polymer, releasing cellobiose from the reducing or non-reducing ends of the chain (Teeri, 1997, Crystalline cellulose degradation: New insight into the function of cellobiohydrolases, Trends in Biotechnology 15: 160-167; Teeri et al., 1998, Trichoderma reesei cellobiohydrolases: why so efficient on crystalline cellulose?, Biochem.
• E.C. 3.2.1.91 1,4-beta-D-glucan cellobiohydrolase
• Cellulosic material means any material containing cellulose.
• the predominant polysaccharide in the primary cell wall of biomass is cellulose, the second most abundant is hemicellulose, and the third is pectin.
• the secondary cell wall, produced after the cell has stopped growing, also contains polysaccharides and is strengthened by polymeric lignin covalently cross-linked to hemicellulose.
• Cellulose is a homopolymer of anhydrocellobiose and thus a linear beta-(1-4)-D-glucan, while hemicelluloses include a variety of compounds, such as xylans, xyloglucans, arabinoxylans, and mannans in complex branched structures with a spectrum of substituents.
• cellulose is found in plant tissue primarily as an insoluble crystalline matrix of parallel glucan chains. Hemicelluloses usually hydrogen bond to cellulose, as well as to other hemicelluloses, which help stabilize the cell wall matrix.
• Cellulose is generally found, for example, in the stems, leaves, hulls, husks, and cobs of plants or leaves, branches, and wood of trees.
• the cellulosic material can be, but is not limited to, herbaceous material (including energy crops), agricultural residue, wood (including forestry residue), municipal solid waste, waste paper, and pulp and paper mill residue (see, for example, Wiselogel et al., 1995, in Handbook on Bioethanol (Charles E. Wyman, editor), pp.
• the cellulose may be in the form of lignocellulose, a plant cell wall material containing lignin, cellulose, and hemicellulose in a mixed matrix.
• the cellulosic material is any biomass material.
• the cellulosic material is lignocellulose, which comprises cellulose, hemicelluloses, and lignin.
• the cellulosic material is herbaceous material (including energy crops). In another aspect, the cellulosic material is agricultural residue. In another aspect, the cellulosic material is wood (including forestry residue). In another aspect, the cellulosic material is municipal solid waste. In another aspect, the cellulosic material is waste paper. In another aspect, the cellulosic material is pulp and paper mill residue.
• the cellulosic material is corn stover. In another aspect, the cellulosic material is wheat straw. In another aspect, the cellulosic material is bagasse. In another aspect, the cellulosic material is corn cob. In another aspect, the cellulosic material is switchgrass. In another aspect, the cellulosic material is corn fiber. In another aspect, the cellulosic material is rice straw. In another aspect, the cellulosic material is miscanthus. In another aspect, the cellulosic material is orange peel. In another aspect, the cellulosic material is poplar. In another aspect, the cellulosic material is pine. In another aspect, the cellulosic material is willow. In another aspect, the cellulosic material is eucalyptus.
• the cellulosic material is microcrystalline cellulose. In another aspect, the cellulosic material is bacterial cellulose. In another aspect, the cellulosic material is algal cellulose. In another aspect, the cellulosic material is cotton linter. In another aspect, the cellulosic material is amorphous phosphoric-acid treated cellulose. In another aspect, the cellulosic material is filter paper.
• the cellulosic material is an aquatic biomass.
• aquatic biomass means biomass produced in an aquatic environment by a photosynthesis process.
• the aquatic biomass can be algae; submerged plants; emergent plants; and floating-leaf plants.
• the cellulosic material may be used as is or may be subjected to pretreatment, using conventional methods known in the art, as described herein. In a preferred aspect, the cellulosic material is pretreated.
• Cellulolytic enzyme or cellulase means one or more (e.g., several) enzymes that hydrolyze a cellulosic material. Such enzymes include endoglucanase(s), cellobiohydrolase(s), beta-glucosidase(s), or combinations thereof.
• the two basic approaches for measuring cellulolytic activity include: (1) measuring the total cellulolytic activity, and (2) measuring the individual cellulolytic activities (endoglucanases, cellobiohydrolases, and beta-glucosidases) as reviewed in Zhang et al., Outlook for cellulase improvement: Screening and selection strategies, 2006 , Biotechnology Advances 24: 452-481.
• Total cellulolytic activity is usually measured using insoluble substrates, including Whatman No. 1 filter paper, microcrystalline cellulose, bacterial cellulose, algal cellulose, cotton, pretreated lignocellulose, etc.
• the most common total cellulolytic activity assay is the filter paper assay using Whatman No. 1 filter paper as the substrate.
• the assay was established by the International Union of Pure and Applied Chemistry (IUPAC) (Ghose, 1987, Measurement of cellulase activities, Pure Appl. Chem. 59: 257-68).
• cellulolytic enzyme activity is determined by measuring the increase in hydrolysis of a cellulosic material by cellulolytic enzyme(s) under the following conditions: 1-20 mg of cellulolytic enzyme protein/g of cellulose in PCS for 3-7 days at a suitable temperature, e.g., 50° C., 55° C., or 60° C., compared to a control hydrolysis without addition of cellulolytic enzyme protein.
• Typical conditions are 1 ml reactions, washed or unwashed PCS, 5% insoluble solids, 50 mM sodium acetate pH 5, 1 mM MnSO 4 , 50° C., 55° C., or 60° C., 72 hours, sugar analysis by AMINEX® HPX-87H column (Bio-Rad Laboratories, Inc., Hercules, Calif., USA).
• Coding sequence means a polynucleotide, which directly specifies the amino acid sequence of its polypeptide product.
• the boundaries of the coding sequence are generally determined by an open reading frame, which usually begins with the ATG start codon or alternative start codons such as GTG and TTG and ends with a stop codon such as TAA, TAG, and TGA.
• the coding sequence may be a DNA, cDNA, synthetic, or recombinant polynucleotide.
• control sequence means all components necessary for the expression of a polynucleotide encoding an alpha-amylase of the present invention.
• Each control sequence may be native or foreign to the polynucleotide encoding the alpha-amylase or native or foreign to each other.
• control sequences include, but are not limited to, a leader, polyadenylation sequence, propeptide sequence, promoter, signal peptide sequence, and transcription terminator.
• the control sequences include a promoter, and transcriptional and translational stop signals.
• the control sequences may be provided with linkers for the purpose of introducing specific restriction sites facilitating ligation of the control sequences with the coding region of the polynucleotide encoding an alpha-amylase.
• Endoglucanase means an endo-1,4-(1,3; 1,4)-beta-D-glucan 4-glucanohydrolase (E.C. 3.2.1.4), which catalyzes endohydrolysis of 1,4-beta-D-glycosidic linkages in cellulose, cellulose derivatives (such as carboxymethyl cellulose and hydroxyethyl cellulose), lichenin, beta-1,4 bonds in mixed beta-1,3 glucans such as cereal beta-D-glucans or xyloglucans, and other plant material containing cellulosic components.
• Endoglucanase activity can be determined by measuring reduction in substrate viscosity or increase in reducing ends determined by a reducing sugar assay (Zhang et al., 2006 , Biotechnology Advances 24: 452-481). For purposes of the present invention, endoglucanase activity is determined using carboxymethyl cellulose (CMC) as substrate according to the procedure of Ghose, 1987 , Pure and Appl. Chem. 59: 257-268, at pH 5, 40° C.
• CMC carboxymethyl cellulose
• expression includes any step involved in the production of the polypeptide including, but not limited to, transcription, post-transcriptional modification, translation, post-translational modification, and secretion.
• Expression vector means a linear or circular DNA molecule that comprises a polynucleotide encoding a polypeptide of the present invention and is operably linked to additional nucleotides that provide for its expression.
• Family 61 glycoside hydrolase The term “Family 61 glycoside hydrolase” or “Family GH61” or “GH61” means a polypeptide falling into the glycoside hydrolase Family 61 according to Henrissat, 1991, A classification of glycosyl hydrolases based on amino-acid sequence similarities, Biochem. J. 280: 309-316, and Henrissat and Bairoch, 1996, Updating the sequence-based classification of glycosyl hydrolases, Biochem. J. 316: 695-696. The enzymes in this family were originally classified as a glycoside hydrolase family based on measurement of very weak endo-1,4-beta-D-glucanase activity in one family member.
• Ferulic acid esterase or feruloyl esterase means a 4-hydroxy-3-methoxycinnamoyl-sugar hydrolase (EC 3.1.1.73) that catalyzes the hydrolysis of the 4-hydroxy-3-methoxycinnamoyl (feruloyl) group from an esterified sugar, which is usually arabinose in “natural” substrates, to produce ferulate (4-hydroxy-3-methoxycinnamate).
• Feruloyl esterase is also known as ferulic acid esterase, hydroxycinnamoyl esterase, FAE-III, cinnamoyl ester hydrolase, FAEA, cinnAE, FAE-I, or FAE-II.
• feruloyl esterase activity is determined using 0.5 mM p-nitrophenylferulate as substrate in 50 mM sodium acetate pH 5.0.
• One unit of feruloyl esterase equals the amount of enzyme capable of releasing 1 micromole of p-nitrophenolate anion per minute at pH 5, 25° C.
• Hemicellulolytic enzyme or hemicellulase means one or more (e.g., several) enzymes that hydrolyze a hemicellulosic material. See, for example, Shallom and Shoham, 2003, Microbial hemicellulases, Current Opinion In Microbiology 6(3): 219-228. Hemicellulases are key components in the degradation of plant biomass.
• hemicellulases include, but are not limited to, an acetylmannan esterase, an acetyxylan esterase, an arabinanase, an arabinofuranosidase, a coumaric acid esterase, a feruloyl esterase, a galactosidase, a glucuronidase, a glucuronoyl esterase, a mannanase, a mannosidase, a xylanase, and a xylosidase.
• the substrates of these enzymes are a heterogeneous group of branched and linear polysaccharides that are bound via hydrogen bonds to the cellulose microfibrils in the plant cell wall, crosslinking them into a robust network. Hemicelluloses are also covalently attached to lignin, forming together with cellulose a highly complex structure. The variable structure and organization of hemicelluloses require the concerted action of many enzymes for its complete degradation.
• the catalytic modules of hemicellulases are either glycoside hydrolases (GHs) that hydrolyze glycosidic bonds, or carbohydrate esterases (CEs), which hydrolyze ester linkages of acetate or ferulic acid side groups.
• GHs glycoside hydrolases
• CEs carbohydrate esterases
• catalytic modules based on homology of their primary sequence, can be assigned into GH and CE families marked by numbers. Some families, with overall similar fold, can be further grouped into clans, marked alphabetically (e.g., GH-A).
• GH-A GH-A
• a most informative and updated classification of these and other carbohydrate active enzymes is available on the Carbohydrate-Active Enzymes (CAZy) database. Hemicellulolytic enzyme activities can be measured according to Ghose and Bisaria, 1987 , Pure & Appl. Chem. 59: 1739-1752, at a suitable temperature, e.g., 50° C., 55° C., or 60° C.
• host cell means any cell type that is susceptible to transformation, transfection, transduction, and the like with a nucleic acid construct or expression vector comprising a polynucleotide of the present invention.
• host cell encompasses any progeny of a parent cell that is not identical to the parent cell due to mutations that occur during replication.
• nucleic acid construct means a nucleic acid molecule, either single- or double-stranded, which is isolated from a naturally occurring gene or is modified to contain segments of nucleic acids in a manner that would not otherwise exist in nature or which is synthetic.
• nucleic acid construct is synonymous with the term “expression cassette” when the nucleic acid construct contains the control sequences required for expression of a coding sequence.
• operably linked means a configuration in which a control sequence is placed at an appropriate position relative to the coding sequence of the polynucleotide sequence such that the control sequence directs the expression of the coding sequence of a polypeptide.
• Polypeptide fragment means a polypeptide having one or more (several) amino acids deleted from the amino and/or carboxyl terminus of a mature polypeptide; wherein the fragment has enzyme activity.
• Polypeptide having cellulolytic enhancing activity means a GH61 polypeptide that catalyzes the enhancement of the hydrolysis of a cellulosic material by enzyme having cellulolytic activity.
• cellulolytic enhancing activity is determined by measuring the increase in reducing sugars or the increase of the total of cellobiose and glucose from the hydrolysis of a cellulosic material by cellulolytic enzyme under the following conditions: 1-50 mg of total protein/g of cellulose in PCS, wherein total protein is comprised of 50-99.5% w/w cellulolytic enzyme protein and 0.5-50% w/w protein of a GH61 polypeptide having cellulolytic enhancing activity for 1-7 days at a suitable temperature, e.g., 50° C., 55° C., or 60° C., compared to a control hydrolysis with equal total protein loading without cellulolytic enhancing activity (1-50 mg of cellulolytic protein/g of cellulose in PCS).
• a suitable temperature e.g., 50° C., 55° C., or 60° C.
• a mixture of CELLUCLAST® 1.5 L (Novozymes A/S, Bagsv ⁇ rd, Denmark) in the presence of 2-3% of total protein weight Aspergillus oryzae beta-glucosidase (recombinantly produced in Aspergillus oryzae according to WO 02/095014) or 2-3% of total protein weight Aspergillus fumigatus beta-glucosidase (recombinantly produced in Aspergillus oryzae as described in WO 2002/095014) of cellulase protein loading is used as the source of the cellulolytic activity.
• the GH61 polypeptides having cellulolytic enhancing activity enhance the hydrolysis of a cellulosic material catalyzed by enzyme having cellulolytic activity by reducing the amount of cellulolytic enzyme required to reach the same degree of hydrolysis preferably at least 1.01-fold, more preferably at least 1.05-fold, more preferably at least 1.10-fold, more preferably at least 1.25-fold, more preferably at least 1.5-fold, more preferably at least 2-fold, more preferably at least 3-fold, more preferably at least 4-fold, more preferably at least 5-fold, even more preferably at least 10-fold, and most preferably at least 20-fold.
• PCS Pretreated Corn stover
• Pretreated Corn Stover means a cellulosic material derived from corn stover by treatment with heat and dilute sulfuric acid.
• Sequence Identity The relatedness between two amino acid sequences or between two nucleotide sequences is described by the parameter “sequence identity”.
• the degree of sequence identity between two amino acid sequences is determined using the Needleman-Wunsch algorithm (Needleman and Wunsch, 1970 , J. Mol. Biol. 48: 443-453) as implemented in the Needle program of the EMBOSS package (EMBOSS: The European Molecular Biology Open Software Suite, Rice et al., 2000 , Trends Genet. 16: 276-277), preferably version 3.0.0 or later.
• the optional parameters used are gap open penalty of 10, gap extension penalty of 0.5, and the EBLOSUM62 (EMBOSS version of BLOSUM62) substitution matrix.
• the output of Needle labeled “longest identity” (obtained using the ⁇ nobrief option) is used as the percent identity and is calculated as follows:
• the degree of sequence identity between two deoxyribonucleotide sequences is determined using the Needleman-Wunsch algorithm (Needleman and Wunsch, 1970, supra) as implemented in the Needle program of the EMBOSS package (EMBOSS: The European Molecular Biology Open Software Suite, Rice et al., 2000, supra), preferably version 3.0.0 or later.
• the optional parameters used are gap open penalty of 10, gap extension penalty of 0.5, and the EDNAFULL (EMBOSS version of NCBI NUC4.4) substitution matrix.
• the output of Needle labeled “longest identity” (obtained using the ⁇ nobrief option) is used as the percent identity and is calculated as follows:
• xylan-containing material means any material comprising a plant cell wall polysaccharide containing a backbone of beta-(1-4)-linked xylose residues.
• Xylans of terrestrial plants are heteropolymers possessing a beta-(1-4)-D-xylopyranose backbone, which is branched by short carbohydrate chains. They comprise D-glucuronic acid or its 4-O-methyl ether, L-arabinose, and/or various oligosaccharides, composed of D-xylose, L-arabinose, D- or L-galactose, and D-glucose.
• Xylan-type polysaccharides can be divided into homoxylans and heteroxylans, which include glucuronoxylans, (arabino)glucuronoxylans, (glucurono)arabinoxylans, arabinoxylans, and complex heteroxylans. See, for example, Ebringerova et al., 2005 , Adv. Polym. Sci. 186: 1-67.
• any material containing xylan may be used.
• the xylan-containing material is lignocellulose.
• xylan degrading activity or xylanolytic activity means a biological activity that hydrolyzes xylan-containing material.
• the two basic approaches for measuring xylanolytic activity include: (1) measuring the total xylanolytic activity, and (2) measuring the individual xylanolytic activities (e.g., acetylxylan esterases, alpha-glucuronyl esterases, alpha-glucuronidases, arabinofuranosidases, beta-xylosidases, endoxylanases, and feruloyl esterases).
• Total xylan degrading activity can be measured by determining the reducing sugars formed from various types of xylan, including, for example, oat spelt, beechwood, and larchwood xylans, or by photometric determination of dyed xylan fragments released from various covalently dyed xylans.
• the most common total xylanolytic activity assay is based on production of reducing sugars from polymeric 4-O-methyl glucuronoxylan as described in Bailey, Biely, Poutanen, 1992, Interlaboratory testing of methods for assay of xylanase activity, Journal of Biotechnology 23(3): 257-270.
• Xylanase activity can also be determined with 0.2% AZCL-arabinoxylan as substrate in 0.01% TRITON® X-100 and 200 mM sodium phosphate buffer pH 6 at 37° C.
• One unit of xylanase activity is defined as 1.0 micromole of azurine produced per minute at 37° C., pH 6 from 0.2% AZCL-arabinoxylan as substrate in 200 mM sodium phosphate pH 6 buffer.
• xylan degrading activity is determined by measuring the increase in hydrolysis of birchwood xylan (Sigma Chemical Co., Inc., St. Louis, Mo., USA) by xylan-degrading enzyme(s) under the following typical conditions: 1 ml reactions, 5 mg/ml substrate (total solids), 5 mg of xylanolytic protein/g of substrate, 50 mM sodium acetate pH 5, 50° C., 24 hours, sugar analysis using p-hydroxybenzoic acid hydrazide (PHBAH) assay as described by Lever, 1972, A new reaction for colorimetric determination of carbohydrates, Anal. Biochem 47: 273-279.
• PBAH p-hydroxybenzoic acid hydrazide
• xylanase means a 1,4-beta-D-xylan-xylohydrolase (E.C. 3.2.1.8) that catalyzes the endohydrolysis of 1,4-beta-D-xylosidic linkages in xylans.
• xylanase activity is determined with 0.2% AZCL-arabinoxylan as substrate in 0.01% TRITON® X-100 and 200 mM sodium phosphate buffer pH 6 at 37° C.
• One unit of xylanase activity is defined as 1.0 micromole of azurine produced per minute at 37° C., pH 6 from 0.2% AZCL-arabinoxylan as substrate in 200 mM sodium phosphate pH 6 buffer.
• One aspect of the present invention relates to a process of producing a fermentation product from a starch-containing material or a lignocellulosic material comprising a fermentation step in the presence of a hemicellulase(s).
• the present invention relates to a process of producing a fermentation product from a starch-containing material or a lignocellulosic material comprising a fermentation step in the presence of a hemicellulase(s) and an endoglucanase(s).
• the present invention relates to a process of producing a fermentation product from a starch-containing material or a lignocellulosic material comprising a fermentation step in the presence of a hemicellulase(s), an endoglucanase(s), and a GH61 polypeptide(s).
• the present invention relates to a process of producing a fermentation product from a starch-containing material or a lignocellulosic material comprising a fermentation step in the presence of an endoglucanase(s) and a beta-glucanase(s).
• the methods of the invention can be used in conventional as well as raw starch hydrolysis processes, as well as in a biomass process.
• hemicellulase(s) can enhance dewatering of whole stillage and oil extraction from thin stillage or syrup following fermentation, which can be used in biodiesel or other biorenewable product production.
• other enzymes e.g., endoglucanase(s)
• hemicellulase(s) can enhance dewatering of whole stillage and oil extraction from thin stillage or syrup following fermentation, which can be used in biodiesel or other biorenewable product production.
• other enzymes e.g., endoglucanase(s)
• hemicellulase(s) alone or in combination with other enzyme activities, to the fermentation medium during the fermentation step of a process for producing fermentation products may release bound oil in the starch-containing material. Forming more “unbound” oil may allow for the oil to be partitioned into the aqueous phase of the whole stillage following solid/liquid separation into the wet cake and thin stillage. Such oil can then be recovered from the thin stillage or “aque
• the endoglucanase(s) is added in an amount of 0.01-1.0, e.g., 0.02-0.08, 0.025-0.06, 0.025-0.05, or 0.03-0.04 EGU/g dry solids.
• the endoglucanase(s) is added in an amount of 1-30, e.g., 5-30 7-25, 10-20, 10-17, or 12-15 micrograms/g dry solids.
• the hemicellulase(s) is added in an amount of 0.01-1.0, e.g., 0.015-0.08, 0.015-0.06, 0.015-0.04, or 0.02-0.03 FXU/g dry solids.
• the hemicellulase(s) is added in an amount of 1-30, e.g., 5-30, 7-25, 10-20, 10-17, or 12-15 micrograms/g dry solids.
• the instant invention also leads to the enhancement of DDGS by decreasing the fat or oil content in the DDGS thus producing a higher quality DDGS.
• the present invention relates to a process for producing a fermentation product comprising:
• step (b) saccharifying the liquefied material obtained in step (a) using a carbohydrate-source generating enzyme
• the present invention relates to a process for producing a fermentation product comprising the steps of:
• step (b) saccharifying the liquefied material obtained in step (a) using a carbohydrate-source generating enzyme
• the saccharification and fermentation steps may be carried out either sequentially or simultaneously.
• the hemicellulase(s) and/or endoglucanase(s) may be added during saccharification and/or fermentation when the process is carried out as a sequential saccharification and fermentation process and before or during fermentation when steps (b) and (c) are carried out simultaneously (SSF process).
• the liquefaction is preferably carried out in the presence of an alpha-amylase, preferably a bacterial alpha-amylase or acid fungal alpha-amylase.
• an alpha-amylase preferably a bacterial alpha-amylase or acid fungal alpha-amylase.
• a pullulanase, isoamylase, and/or phytase is added during liquefaction.
• the fermenting organism is preferably a yeast, e.g., a strain of Saccharomyces cerevisiae . Suitable fermenting organisms are listed in the “Fermenting Organisms” section below.
• Liquefaction may be carried out as a three-step hot slurry process.
• the slurry is heated to between 60-95° C., preferably 80-85° C., and an alpha-amylase is added to initiate liquefaction (thinning).
• the slurry may be jet-cooked at a temperature between 95-140° C., preferably 105-125° C., for about 1-15 minutes, preferably for about 3-10 minutes, especially around about 5 minutes.
• the slurry is cooled to 60-95° C. and more alpha-amylase is added to complete the hydrolysis (secondary liquefaction).
• the liquefaction process is usually carried out at a pH of 4.0 to 6.5, in particular at a pH of 4.5 to 6.
• Saccharification may be carried out using conditions well known in the art with a saccharifying enzyme, e.g., beta-amylase, glucoamylase or maltogenic amylase, and optionally a debranching enzyme, such as an isoamylase or a pullulanase.
• a full saccharification process may last up to from about 24 to about 72 hours, however, it is common to do a pre-saccharification for typically 40-90 minutes at a temperature between 30-65° C., typically about 60° C., followed by complete saccharification during fermentation in a simultaneous saccharification and fermentation process (SSF process). Saccharification is typically carried out at a temperature from 20-75° C., preferably from 40-70° C., typically around 60° C., and at a pH between 4 and 5, normally at about pH 4.5.
• a saccharifying enzyme e.g., beta-amylase, glucoamylase or maltogenic amylase
• a debranching enzyme
• SSF simultaneous saccharification and fermentation
• a fermenting organism such as a yeast
• enzyme(s) including the hemicellulase(s) and/or endoglucanase(s)
• SSF is typically carried out at a temperature from 25° C. to 40° C., such as from 28° C. to 35° C., from 30° C. to 34° C., preferably around about 32° C.
• fermentation is ongoing for 6 to 120 hours, in particular 24 to 96 hours.
• the process of the invention further comprises, prior to step (a), the steps of:
• the aqueous slurry may contain from 10-55 w/w % dry solids (DS), preferably 25-45 w/w % dry solids (DS), more preferably 30-40 w/w % dry solids (DS) of the starch-containing material.
• the slurry is heated to above the gelatinization temperature and an alpha-amylase, preferably a bacterial and/or acid fungal alpha-amylase, may be added to initiate liquefaction (thinning).
• the slurry may be jet-cooked to further gelatinize the slurry before being subjected to an alpha-amylase in step (a).
• the invention relates to processes for producing a fermentation product from a starch-containing material without gelatinization (i.e., without cooking) of the starch-containing material in the presence of a hemicellulase(s).
• the invention relates to processes for producing a fermentation product from a starch-containing material without gelatinization (i.e., without cooking) of the starch-containing material wherein an endoglucanase(s) and a hemicellulase(s) are present during the raw starch hydrolysis process, wherein the endoglucanase(s) is present in an amount of 0.01-1.0 EGU/g dry solids and in an amount of 1-30 micrograms/g dry solids, the hemicellulase(s) is present in an amount of 0.01-1.0 FXU/g dry solids and in an amount of 1-30 micrograms/g dry solids.
• the desired fermentation product such as ethanol
• the desired fermentation product is produced from an ungelatinized starch containing material.
• the process comprises simultaneously saccharifying and fermenting a starch-containing material, e.g., granular starch, using an alpha-amylase, a carbohydrate-source generating enzyme, and a fermenting organism at a temperature below the initial gelatinization temperature of the starch-containing material, in the presence of the endogluanase(s) and/or hemicellulase(s).
• initial gelatinization temperature means the lowest temperature at which starch gelatinization commences.
• starch heated in water begins to gelatinize between about 50° C. and 75° C.; the exact temperature of gelatinization depends on the specific starch and can readily be determined by the skilled artisan.
• the initial gelatinization temperature may vary according to the plant species, to the particular variety of the plant species as well as with the growth conditions.
• the initial gelatinization temperature of a given starch-containing material may be determined as the temperature at which birefringence is lost in 5% of the starch granules using the method described by Gorinstein and Lii, 1992 , Starch/Starke 44(12): 461-466.
• An RSH process is conducted at a temperature below the initial gelatinization temperature, which means that the temperature typically lies in the range between 30-75° C., preferably between 45-60° C.
• the process is carried out at a temperature from 25° C. to 40° C., such as from 28° C. to 35° C., such as from 30° C. to 34° C., preferably around 32° C.
• a slurry of a starch-containing material such as granular starch, having 10-55 w/w % dry solids (DS), preferably 25-45 w/w % dry solids, more preferably 30-40 w/w % dry solids of the starch-containing material may be prepared.
• the slurry may include water and/or process waters, such as stillage (backset), scrubber water, evaporator condensate or distillate, side-stripper water from distillation, or process water from other fermentation product plants. Because the RSH process of the invention is carried out below the initial gelatinization temperature, and thus no significant viscosity increase takes place, high levels of stillage may be used if desired.
• the aqueous slurry contains from about 1 to about 70 vol. %, preferably 15-60 vol. %, especially from about 30 to 50 vol. % water and/or process waters, such as stillage (backset), scrubber water, evaporator condensate or distillate, side-stripper water from distillation, or process water from other fermentation product plants, or combinations thereof, or the like.
• process waters such as stillage (backset), scrubber water, evaporator condensate or distillate, side-stripper water from distillation, or process water from other fermentation product plants, or combinations thereof, or the like.
• the starch-containing material may be prepared by reducing the particle size, preferably by dry or wet milling, to 0.05 to 3.0 mm, preferably 0.1-0.5 mm. After being subjected to a process of the invention at least 85%, at least 86%, at least 87%, at least 88%, at least 89%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, or preferably at least 99% of the dry solids in the starch-containing material are converted into a soluble starch hydrolyzate.
• the present invention also relates to processes of producing a fermentation product, comprising the steps of:
• the present invention also relates to processes of producing a fermentation product, comprising the steps of:
• Steps (b) and (c) may be performed separately or simultaneously.
• step (b) may be initiated followed by the continuation of step (b) with step (c), otherwise known as a hybrid hydrolysis and fermentation process.
• the lignocellulose-containing material may be pre-treated before being hydrolyzed and fermented.
• the goal of pre-treatment is to separate and/or release cellulose, hemicellulose and/or lignin and this way improve the rate of enzymatic hydrolysis.
• the lignocellulose-containing material may be present in an amount between 10-80 wt. %, e.g., between 20-50 wt. %.
• the lignocellulose-containing material may be chemically, mechanically and/or biologically pre-treated before hydrolysis and/or fermentation.
• Mechanical treatment (often referred to as a physical pre-treatment) may be used alone or in combination with subsequent or simultaneous hydrolysis, especially enzymatic hydrolysis, to promote the separation and/or release of cellulose, hemicellulose and/or lignin.
• the chemical, mechanical and/or biological pre-treatment is carried out prior to the hydrolysis and/or fermentation.
• the chemical, mechanical and/or biological pre-treatment is carried out simultaneously with hydrolysis, such as simultaneously with addition of one or more cellulolytic enzymes, or other enzyme activities mentioned below, to release fermentable sugars, such as glucose and/or maltose.
• Chemical pre-treatment refers to any chemical treatment which promotes the separation and/or release of cellulose, hemicellulose and/or lignin.
• suitable chemical pre-treatment steps include treatment with, for example, dilute acid, lime, alkaline, organic solvent, ammonia, sulphur dioxide, carbon dioxide.
• wet oxidation and pH-controlled hydrothermolysis are also contemplated chemical pre-treatments.
• the chemical pre-treatment is acid treatment, more preferably, a continuous dilute and/or mild acid treatment, such as, treatment with sulfuric acid, or another organic acid, such as acetic acid, citric acid, tartaric acid, succinic acid, or a mixture thereof. Other acids may also be used.
• Mild acid treatment means in the context of the present invention that the treatment pH lies in the range from 1-5, preferably from pH 1-3. In a specific embodiment the acid concentration is in the range from 0.1 to 2.0 wt. % acid, preferably sulphuric acid.
• the acid may be mixed or contacted with the material to be fermented according to the invention and the mixture may be held at a temperature in the range of 160-220° C., such as 165-195° C., for periods ranging from minutes to seconds, e.g., 1-60 minutes, such as 2-30 minutes or 3-12 minutes.
• Addition of strong acids, such as sulphuric acid, may be applied to remove hemicellulose. This enhances the digestibility of cellulose.
• the pre-treatment may also be an alkaline chemical pre-treatment with base, e.g., NaOH, Na 2 CO 3 and/or ammonia or the like.
• base e.g., NaOH, Na 2 CO 3
• Pre-treatment methods using ammonia are described in, e.g., WO 2006/110891, WO 2006/110899, WO 2006/110900, WO 2006/110901, which are hereby incorporated by reference.
• oxidizing agents such as: sulphite based oxidizing agents or the like.
• solvent pre-treatments include treatment with DMSO (dimethyl sulfoxide) or the like.
• Chemical pre-treatment is generally carried out for 1 to 60 minutes, such as from 5 to 30 minutes, but may be carried out for shorter or longer periods of time dependent on the material to be pre-treated.
• Mechanical pre-treatment refers to any mechanical or physical pre-treatment which promotes the separation and/or release of cellulose, hemicellulose and/or lignin from lignocellulose-containing material.
• mechanical pre-treatment includes various types of milling, irradiation, steaming/steam explosion, and hydrothermolysis.
• Mechanical pre-treatment includes comminution (mechanical reduction of the particle size). Comminution includes dry milling, wet milling and vibratory ball milling. Mechanical pre-treatment may involve high pressure and/or high temperature (steam explosion).
• high pressure means pressure in the range from 300 to 600 psi, preferably 400 to 500 psi, such as around 450 psi.
• high temperature means temperatures in the range from about 100 to 300° C., preferably from about 140 to 235° C.
• mechanical pre-treatment is a batch-process, steam gun hydrolyzer system which uses high pressure and high temperature as defined above. A Sunds Hydrolyzer (available from Sunds Defibrator AB (Sweden) may be used for this.
• both chemical and mechanical pre-treatments are carried out involving, for example, both dilute or mild acid pretreatment and high temperature and pressure treatment.
• the chemical and mechanical pretreatment may be carried out sequentially or simultaneously, as desired.
• the lignocellulose-containing material is subjected to both chemical and mechanical pre-treatment to promote the separation and/or release of cellulose, hemicellulose and/or lignin.
• pre-treatment is carried out as a dilute and/or mild acid steam explosion step.
• pre-treatment is carried out as an ammonia fiber explosion step (or AFEX pretreatment step).
• Bio pre-treatment refers to any biological pre-treatment which promotes the separation and/or release of cellulose, hemicellulose, and/or lignin from the lignocellulose-containing material.
• Biological pre-treatment techniques can involve applying lignin-solubilizing microorganisms (see, for example, Hsu, T. A., 1996, Pretreatment of biomass, in Handbook on Bioethanol: Production and Utilization , Wyman, C. E., ed., Taylor & Francis, Washington, D.C., 179-212; Ghosh and Singh, 1993, Physicochemical and biological treatments for enzymatic/microbial conversion of lignocellulosic biomass, Adv. Appl. Microbiol.
• the pre-treated material is hydrolyzed, preferably enzymatically, before and/or during fermentation.
• the pre-treated lignocellulose-containing material may be hydrolyzed in order to break the lignin seal and disrupt the crystalline structure of cellulose.
• hydrolysis is carried out enzymatically by one or more hydrolases (class E.C. 3 according to Enzyme Nomenclature), preferably one or more carbohydrases including cellulolytic enzymes and hemicellulolytic enzymes, or a combination thereof.
• alpha-amylase, glucoamylase, protease, and/or the like may be present during hydrolysis and/or fermentation as the lignocellulose-containing material may include some, e.g., starchy and/or proteinaceous material.
• the enzyme(s) used for hydrolysis are capable of directly or indirectly converting carbohydrate polymers into fermentable sugars, such as glucose and/or maltose, which can be fermented into a desired fermentation product, such as ethanol.
• the carbohydrase(s) has(have) cellulolytic (cellobiohydrolase, endoglucanase and beta-glucosidase) and/or hemicellulolytic (e.g., xylanase) activity.
• cellulolytic cellobiohydrolase, endoglucanase and beta-glucosidase
• hemicellulolytic e.g., xylanase
• hydrolysis is carried out using a cellulolytic enzyme preparation further comprising one or more polypeptides having cellulolytic enhancing activity.
• the polypeptide(s) having cellulolytic enhancing activity is(are) of family GH61A origin. Examples of suitable and preferred cellulolytic enzyme preparations and polypeptides having cellulolytic enhancing activity are described in the “Cellulolytic Enzymes” section and “Cellulolytic Enhancing Polypeptides” sections below.
• Hemicellulose polymers can be broken down by hemicellullolytic enzymes and/or acid hydrolysis to release its five and six carbon sugar components.
• the six carbon sugars such as arabinose, galactose, glucose, and mannose, can readily be fermented to fermentation products such as acetone, butanol, citric acid, ethanol, fumaric acid, glycerol, etc. by suitable fermenting organisms including yeast.
• Yeast is the preferred fermenting organism for ethanol fermentation.
• Preferred are strains of Saccharomyces , especially strains of Saccharomyces cerevisiae , preferably strains which are resistant towards high levels of ethanol, i.e., up to, e.g., about 10, 12, 15 or 20 vol. % or more ethanol.
• Enzymatic hydrolysis is preferably carried out in a suitable aqueous environment under conditions which can readily be determined by one skilled in the art. In a preferred embodiment hydrolysis is carried out at suitable, preferably optimal, conditions for the enzyme(s) in question.
• Suitable process time, temperature and pH conditions can readily be determined by one skilled in the art.
• hydrolysis is carried out at a temperature between 25 and 70° C., e.g., between 40 and 60° C., especially around 50° C.
• the step is preferably carried out at a pH in the range from 3-8, e.g., pH 4-6.
• Hydrolysis is typically carried out for between 12 and 96 hours, e.g., between 16 to 72 hours, in particular between 24 and 48 hours.
• the pre-treated lignocellulose-containing material is washed and/or detoxified before or after hydrolysis step (b). This may improve the fermentability of, e.g., dilute-acid hydrolyzed lignocellulose-containing material, such as corn stover. Detoxification may be carried out in any suitable way, e.g., by steam stripping, evaporation, ion exchange, resin or charcoal treatment of the liquid fraction or by washing the pre-treated material.
• “Fermentation media” or “fermentation medium” refers to the environment in which fermentation is carried out and which includes the fermentation substrate, that is, the carbohydrate source that is metabolized by the fermenting organism.
• the fermentation medium may comprise nutrients and growth stimulator(s) for the fermenting organism(s).
• Nutrient and growth stimulators are widely used in the art of fermentation and include nitrogen sources, such as ammonia; urea, vitamins and minerals, or combinations thereof.
• the fermentation medium may also include enzymes such as amylases and/or other carbohydrate source generating enzymes, especially wherein the process of the invention is carried out as a simultaneous saccharification and fermentation process or an RSH process.
• fermenting organism refers to any organism, including bacterial and fungal organisms, suitable for use in a fermentation process and capable of producing a desired fermentation product.
• the fermenting organism may be a C6 or C5 fermenting organism, or a combination thereof. Both C5 and C6 fermenting organisms are well known in the art.
• Suitable fermenting organisms are able to ferment, i.e., convert, fermentable sugars, such as arabinose, fructose, galactose, glucose, maltose, mannose, and/or xylose, directly or indirectly into the desired fermentation product.
• fermentable sugars such as arabinose, fructose, galactose, glucose, maltose, mannose, and/or xylose
• fermenting organisms include fungal organisms such as yeast.
• Preferred yeast includes strains of Saccharomyces , in particular strains of Saccharomyces cerevisiae or Saccharomyces uvarum ; a strain of Pichia , preferably Pichia stipitis such as Pichia stipitis CBS 5773 or Pichia pastoris ; a strain of Candida , in particular a strain of Candida utilis, Candida arabinofermentans, Candida diddensii, Candida sonorensis, Candida shehatae, Candida tropicalis , or Candida boidinii .
• Other fermenting organisms include strains of Hansenula , in particular Hansenula polymorpha or Hansenula anomala; Kluyveromyces , in particular Kluyveromyces fragilis or Kluyveromyces marxianus ; and Schizosaccharomyces , in particular Schizosaccharomyces pombe.
• yeast includes, e.g., RED STARTM and ETHANOL REDTM yeast (available from Fermentis/Lesaffre, USA), FALI (available from Fleischmann's Yeast, USA), SUPERSTART and THERMOSACCTM fresh yeast (available from Ethanol Technology, Wis., USA), BIOFERM AFT and XR (available from NABC—North American Bioproducts Corporation, GA, USA), GERT STRAND (available from Gert Strand AB, Sweden), and FERMIOL (available from DSM Specialties).
• RED STARTM and ETHANOL REDTM yeast available from Fermentis/Lesaffre, USA
• FALI available from Fleischmann's Yeast, USA
• SUPERSTART and THERMOSACCTM fresh yeast available from Ethanol Technology, Wis., USA
• BIOFERM AFT and XR available from NABC—North American Bioproducts Corporation, GA, USA
• GERT STRAND available from Gert Strand AB, Sweden
• FERMIOL available from DSM Specialties
• Preferred bacterial fermenting organisms include strains of Escherichia , in particular Escherichia coli , strains of Zymomonas , in particular Zymomonas mobilis , strains of Zymobacter , in particular Zymobactor palmae , strains of Klebsiella in particular Klebsiella oxytoca , strains of Leuconostoc , in particular Leuconostoc mesenteroides , strains of Clostridium , in particular Clostridium butyricum , strains of Enterobacter , in particular Enterobacter aerogenes and strains of Thermoanaerobacter , in particular Thermoanaerobacter BG1L1 ( Appl.
• Thermoanaerobacter ethanolicus Thermoanaerobacter thermosaccharolyticum , or Thermoanaerobacter mathranii .
• Strains of Lactobacillus are also envisioned as are strains of Corynebacterium glutamicum R, Bacillus thermoglucosidaisus , and Geobacillus thermoglucosidasius.
• the fermenting organism is a C6 sugar fermenting organism, such as a strain of, e.g., Saccharomyces cerevisiae.
• C5 sugar fermenting organisms may be used. Most C5 sugar fermenting organisms also ferment C6 sugars. Examples of C5 sugar fermenting organisms include strains of Pichia , such as of the species Pichia stipitis . C5 sugar fermenting bacteria are also known. Also some Saccharomyces cerevisae strains ferment C5 (and C6) sugars. Examples are genetically modified strains of Saccharomyces spp.
• the fermentative performance of certain fermenting organisms may be inhibited by the presence of inhibitors in the fermentation media and thus reduce ethanol production capacity.
• Compounds in biomass hydrozylates and high concentrations of ethanol are known to inhibit the fermentative capacity of certain yeast cells.
• Pre-adaptation or adaptation methods may reduce this inhibitory effect.
• pre-adaptation or adaptation of yeast cells involves sequentially growing yeast cells, prior to fermentation, to increase the fermentative performance of the yeast and increase ethanol production. Methods of yeast pre-adaptation and adaptation are known in the art.
• Such methods may include, for example, growing the yeast cells in the presence of crude biomass hydrolyzates; growing yeast cells in the presence of inhibitors such as phenolic compounds, furaldehydes and organic acids; growing yeast cells in the presence of non-inhibiting amounts of ethanol; and supplementing the yeast cultures with acetaldehyde.
• the fermenting organism is a yeast strain subject to one or more pre-adaptation or adaptation methods prior to fermentation.
• the fermenting organism is preferably grown under precise conditions at a particular growth rate.
• the inoculated fermenting organism pass through a number of stages. Initially growth does not occur. This period is referred to as the “lag phase” and may be considered a period of adaptation.
• the growth rate gradually increases. After a period of maximum growth the rate ceases and the fermenting organism enters “stationary phase”. After a further period of time the fermenting organism enters the “death phase” where the number of viable cells declines.
• the fermenting organism is added to the fermentation medium so that the viable fermenting organism count per mL of fermentation medium is in the range from 10 5 to 10 12 , preferably from 10 7 to 10 10 , especially about 5 ⁇ 10 7 .
• starch-containing material Any suitable starch-containing material may be used in the present invention.
• the starting material is generally selected based on the desired fermentation product.
• starch-containing materials include whole grains, barley, beans, cassava, corn, milo, peas, rice, rye, sago, sorghum, sweet potatoes, tapioca, wheat, or mixtures thereof or starches derived therefrom, or cereals. Contemplated are also waxy and non-waxy types of corn and barley.
• granular starch means raw uncooked starch, i.e., starch in its natural form found in cereal, tubers or grains. Starch is formed within plant cells as tiny granules insoluble in water. When put in cold water, the starch granules may absorb a small amount of the liquid and swell. At temperatures up to 50° C. to 75° C. the swelling may be reversible. However, at higher temperatures an irreversible swelling called “gelatinization” begins.
• Granular starch to be processed may be a highly refined starch quality, preferably at least 90%, at least 95%, at least 97% or at least 99.5% pure or it may be a more crude starch-containing material comprising (e.g., milled) whole grains including non-starch fractions such as germ residues and fibers.
• the raw material, such as whole grains may be reduced in particle size, e.g., by milling, in order to open up the structure and allow for further processing.
• Two processes are preferred according to the invention: wet and dry milling. In dry milling whole kernels are milled and used.
• the particle size is reduced to between 0.05 to 3.0 mm, preferably 0.1-0.5 mm, or so that at least 30%, preferably at least 50%, more preferably at least 70%, even more preferably at least 90% of the starch-containing material fits through a sieve with a 0.05 to 3.0 mm screen, preferably 0.1-0.5 mm screen.
• Lignocellulose-containing material may be any material containing lignocellulose.
• the lignocellulose-containing material contains at least 50 wt. %, preferably at least 70 wt. %, more preferably at least 90 wt. % lignocellulose.
• the lignocellulose-containing material may also comprise other constituents such as cellulosic material, such as cellulose, hemicellulose and may also comprise constituents such as sugars, such as fermentable sugars and/or un-fermentable sugars.
• Lignocellulose-containing material is generally found, for example, in the stems, leaves, hulls, husks, and cobs of plants or leaves, branches, and wood of trees.
• Lignocellulosic material can also be, but is not limited to, herbaceous material, agricultural residues, forestry residues, municipal solid wastes, waste paper, and pulp and paper mill residues. It is understood herein that lignocellulose-containing material may be in the form of plant cell wall material containing lignin, cellulose, and hemi-cellulose in a mixed matrix.
• the lignocellulose-containing material is selected from one or more of corn fiber, rice straw, pine wood, wood chips, poplar, bagasse, and paper and pulp processing waste.
• Suitable lignocellulose-containing material include corn stover, corn cobs, hard wood such as poplar and birch, soft wood, cereal straw such as wheat straw, switch grass, Miscanthus, rice hulls, municipal solid waste (MSW), industrial organic waste, office paper, or mixtures thereof.
• the lignocellulose-containing material is corn stover or corn cobs. In another embodiment, the lignocellulose-containing material is corn fiber. In another embodiment, the lignocellulose-containing material is switch grass. In another embodiment, the lignocellulose-containing material is bagasse.
• Fermentation product means a product produced by a process including a fermentation step using a fermenting organism. Fermentation products include alcohols (e.g., arabinitol, n-butanol, isobutanol, ethanol, glycerol, methanol, ethylene glycol, 1,3-propanediol [propylene glycol], butanediol, glycerin, sorbitol, and xylitol); organic acids (e.g., acetic acid, acetonic acid, adipic acid, ascorbic acid, citric acid, 2,5-diketo-D-gluconic acid, formic acid, fumaric acid, glucaric acid, gluconic acid, glucuronic acid, glutaric acid, 3-hydroxypropionic acid, itaconic acid, lactic acid, malic acid, malonic acid, oxalic acid, oxaloacetic acid, propionic acid, succinic
• pentene, hexene, heptene, and octene ); isoprene; polyketide; gases (e.g., methane, hydrogen (H 2 ), carbon dioxide (CO 2 ), and carbon monoxide (CO)); antibiotics (e.g., penicillin and tetracycline); enzymes; vitamins (e.g., riboflavin, B 12 , beta-carotene); and hormones.
• gases e.g., methane, hydrogen (H 2 ), carbon dioxide (CO 2 ), and carbon monoxide (CO)
• antibiotics e.g., penicillin and tetracycline
• enzymes e.g., penicillin and tetracycline
• vitamins e.g., riboflavin, B 12 , beta-carotene
• the fermentation product is ethanol, e.g., fuel ethanol; drinking ethanol, i.e., potable neutral spirits; or industrial ethanol or products used in the consumable alcohol industry (e.g., beer and wine), dairy industry (e.g., fermented dairy products), leather industry and tobacco industry.
• Preferred beer types comprise ales, stouts, porters, lagers, bitters, malt liquors, happoushu, high-alcohol beer, low-alcohol beer, low-calorie beer or light beer.
• Preferred fermentation processes include alcohol fermentation processes.
• the fermentation product is ethanol, which may be used as fuel ethanol or as potable ethanol.
• the fermentation product may be separated from the fermentation medium.
• the slurry may be distilled to extract the desired fermentation product or the desired fermentation product from the fermentation medium by micro or membrane filtration techniques.
• the fermentation product may be recovered by stripping. Methods for recovering fermentation products are well known in the art.
• the fermentation product e.g., ethanol, with a purity of up to, e.g., about 96 vol. % ethanol is obtained.
• the term “whole stillage” includes the material that remains at the end of the fermentation process both before and after recovery of the fermentation product, e.g., ethanol.
• the fermentation product can optionally be recovered by any method known in the art.
• the whole stillage is separated or partitioned into a solid and liquid phase by one or more methods for separating the thin stillage from the wet cake. Such methods include, for example, centrifugation and decanting.
• the fermentation product can be optionally recovered before or after the whole stillage is separated into a solid and liquid phase.
• the method of the invention further comprises distillation to obtain the fermentation product, e.g., ethanol.
• the fermentation and the distillation may be carried out simultaneously and/or separately/sequentially; optionally followed by one or more process steps for further refinement of the fermentation product.
• the aqueous by-product (whole stillage) from the distillation process is separated into two fractions, e.g., by centrifugation: wet grain (solid phase), and thin stillage (supernatant).
• the method of the invention further comprises separation of the whole stillage produced by distillation into wet grain and thin stillage; and recycling thin stillage to the starch containing material prior to liquefaction.
• the thin stillage is recycled to the milled whole grain slurry.
• the wet grain fraction may be dried, typically in a drum dryer.
• the dried product is referred to as distillers dried grains, and can be used, e.g., as animal feed.
• the thin stillage fraction may be evaporated providing two fractions (see FIG. 1):
• a syrup fraction mainly consisting of limit dextrins and non fermentable sugars, which may be introduced into a dryer together with the wet grains (from the whole stillage separation step) to provide a product referred to as distillers dried grain with solubles, which also can be used as animal feed.
• Thin stillage is the term used for the supernatant of the centrifugation of the whole stillage.
• the thin stillage contains 4-6% DS (mainly starch and proteins) and has a temperature of about 60-90° C.
• the thin stillage is not recycled, but the condensate stream of evaporated thin stillage is recycled to the slurry containing the milled whole grain to be jet cooked.
• stillage is the product which remains after the mash has been converted to sugar, fermented and distilled into ethanol. Stillage can be separated into two fractions, such as, by centrifugation or screening: (1) wet cake (solid phase) and (2) the thin stillage (supernatant).
• the solid fraction or distillers' wet grain (DWG) can be pressed to remove excess moisture and then dried to produce distillers' dried grains (DDG). After ethanol has been removed from the liquid fraction, the remaining liquid can be evaporated to concentrate the soluble material into condensed distillers' solubles (DS) or dried and ground to create distillers' dried solubles (DDS). DDS is often mixed with DDG to form distillers' dried grain with solubles (DDGS). DDG, DDGS, and DWG are collectively referred to as distillers' grain(s).
• DDGS following an ethanol production process from corn typically contains about 13% oil, 31% protein and 56% carbohydrates and other components. Removal of some of the oil from the DDGS will improve the quality of the DDGS for the feed market as many feed producers prefer less oil and fat in the DDGS to make high quality feed.
• Methods for dewatering stillage and for extracting oil from a fermentation product are known in the art. These methods include decanting or otherwise separating the whole stillage into wet cake and thin stillage. See, e.g., U.S. Pat. Nos. 6,433,146, 7,601,858, and 7,608,729, and U.S. Application Publication No. 2010/0058649.
• the thin stillage can be evaporated or condensed into syrup or thick stillage from which the oil can be extracted utilizing centrifugation, filtering, heat, high temperature, increased pressure, or a combination of the same.
• Another way to extract oil is to lower the pH of the thin stillage or syrup.
• surfactants to break emulsions also enhances oil extraction. Presses can also be used for dewatering.
• the presence of hemicellulase(s) and/or endoglucanase(s) during fermentation in the processes of the invention increases the amount of oil in the thin stillage and further the syrup or thick stillage as compared to the amount of oil in the thin stillage, syrup or thick stillage when a hemicellulase and/or an endoglucanase are not added to the fermentation process.
• the fermentation product(s) can be optionally recovered from the fermentation medium using any method known in the art including, but not limited to, chromatography, electrophoretic procedures, differential solubility, distillation, or extraction.
• alcohol is separated from the fermented cellulosic material and purified by conventional methods of distillation. Ethanol with a purity of up to about 96 vol. % can be obtained, which can be used as, for example, fuel ethanol, drinking ethanol, i.e., potable neutral spirits, or industrial ethanol.
• Hemicellulose can be broken down by hemicellulases and/or acid hydrolysis to release its five and six carbon sugar components.
• hemicellulase suitable for use in hydrolyzing hemicellulose, preferably into xylose may be used.
• Preferred hemicellulases include acetylxylan esterases, endo-arabinases, exo-arabinases, arabinofuranosidases, feruloyl esterase, endo-galactanases, exo-galactanases, glucuronidases, mannases, xylanases, and mixtures of two or more thereof.
• the hemicellulase for use in the present invention is an exo-acting hemicellulase, and more preferably, the hemicellulase is an exo-acting hemicellulase which has the ability to hydrolyze hemicellulose under acidic conditions of below pH 7, preferably pH 3-7.
• the hemicellulase(s) comprises a commercial hemicellulolytic enzyme preparation.
• commercial hemicellulolytic enzyme preparations suitable for use in the present invention include, for example, SHEARZYMETM (Novozymes A/S), CELLICTM HTec (Novozymes A/S), CELLICTM HTec2 (Novozymes A/S), VISCOZYME® (Novozymes A/S), ULTRAFLO® (Novozymes A/S), PULPZYME® HC (Novozymes A/S), MULTIFECT® Xylanase (Genencor), ACCELLERASE® XY (Genencor), ACCELLERASE® XC (Genencor), ECOPULP® TX-200A (AB Enzymes), HSP 6000 Xylanase (DSM), DEPOLTM 333P (Biocatalysts Limit, Wales, UK), DEPOLTM 740L.
• the hemicellulase is a xylanase.
• the xylanase may preferably be of microbial origin, such as of fungal origin (e.g., Aspergillus, Fusarium, Humicola, Meripilus, Trichoderma ) or from a bacterium (e.g., Bacillus ).
• the xylanase is derived from a filamentous fungus, preferably derived from a strain of Aspergillus , such as Aspergillus aculeatus ; or a strain of Humicola , preferably Humicola lanuginosa .
• xylanases useful in the methods of the present invention include, but are not limited to, Aspergillus aculeatus xylanase (GeneSeqP:AAR63790; WO 94/21785), Aspergillus fumigatus xylanases (WO 2006/078256), and Thielavia terrestris NRRL 8126 xylanases (WO 2009/079210).
• the xylanase may preferably be an endo-1,4-beta-xylanase, more preferably an endo-1,4-beta-xylanase of GH 10 or GH 11.
• Examples of commercial xylanases include SHEARZYMETM, BIOFEED WHEATTM, HTec and HTec2 from Novozymes A/S, Denmark.
• beta-xylosidases useful in the methods of the present invention include, but are not limited to, Trichoderma reesei beta-xylosidase (UniProtKB/TrEMBL accession number Q92458), Talaromyces emersonii (SwissProt accession number Q8X212), and Neurospora crassa (SwissProt accession number Q7SOW4).
• acetylxylan esterases useful in the methods of the present invention include, but are not limited to, Hypocrea jecorina acetylxylan esterase (WO 2005/001036), Neurospora crassa acetylxylan esterase (UniProt accession number q7s259), Thielavia terrestris NRRL 8126 acetylxylan esterase (WO 2009/042846), Chaetomium globosum acetylxylan esterase (Uniprot accession number Q2GWX4), Chaetomium gracile acetylxylan esterase (GeneSeqP accession number AAB82124), Phaeosphaeria nodorum acetylxylan esterase (Uniprot accession number QOUHJ1), and Humicola insolens DSM 1800 acetylxylan esterase (WO 2009/073709).
• arabinofuranosidases useful in the methods of the present invention include, but are not limited to, Humicola insolens DSM 1800 arabinofuranosidase (WO 2009/073383) and Aspergillus niger arabinofuranosidase (GeneSeqP accession number AAR94170).
• alpha-glucuronidases useful in the methods of the present invention include, but are not limited to, Aspergillus clavatus alpha-glucuronidase (UniProt accession number alcc12), Trichoderma reesei alpha-glucuronidase (Uniprot accession number Q99024), Talaromyces emersonii alpha-glucuronidase (UniProt accession number Q8 ⁇ 211), Aspergillus niger alpha-glucuronidase (Uniprot accession number Q96WX9), Aspergillus terreus alpha-glucuronidase (SwissProt accession number Q0CJP9), and Aspergillus fumigatus alpha-glucuronidase (SwissProt accession number Q4WW45).
• Aspergillus clavatus alpha-glucuronidase UniProt accession number alcc12
• endo-1,4-(1,3; 1,4)-beta-D-glucan 4-glucanohydrolase (E.C. No. 3.2.1.4), which catalyzes endo-hydrolysis of 1,4-beta-D-glycosidic linkages in cellulose, cellulose derivatives (such as carboxymethyl cellulose and hydroxyethyl cellulose), lichenin, beta-1,4 bonds in mixed beta-1,3 glucans such as cereal beta-D-glucans or xyloglucans, and other plant material containing cellulosic components.
• Endoglucanase activity may be determined using carboxymethyl cellulose (CMC) hydrolysis according to the procedure of Ghose, 1987 , Pure and Appl. Chem. 59: 257-268.
• endoglucanases may be derived from a strain of Trichoderma , such as a strain of Trichoderma reesei ; a strain of Humicola , such as a strain of Humicola insolens ; or a strain of Chrysosporium , such as a strain of Chrysosporium lucknowense.
• Any of the hemicellulases described above can be used for hydrolyzing a lignocelluloses-containing material.
• the hemicellulase may be added in an amount effective to hydrolyze hemicellulose, such as, in an amount from about 0.001 to 0.5 wt. % of total solids (TS), more preferably from about 0.05 to 0.5 wt. % of TS.
• TS total solids
• Xylanases may be added in an amount of 0.001-1.0 g/kg DM (dry matter) substrate, preferably in the amount of 0.005-0.5 g/kg DM substrate, and most preferably from 0.05-0.10 g/kg DM substrate.
• cellulolytic activity includes enzymes having cellobiohydrolase activity (EC 3.2.1.91), e.g., cellobiohydrolase I and cellobiohydrolase II, endoglucanase activity (EC 3.2.1.4) and/or beta-glucosidase activity (EC 3.2.1.21).
• At least three categories of enzymes are important for converting cellulose into fermentable sugars: endoglucanases (EC 3.2.1.4) that cut the cellulose chains at random; cellobiohydrolases (EC 3.2.1.91) which cleave cellobiosyl units from the cellulose chain ends and beta-glucosidases (EC 3.2.1.21) that convert cellobiose and soluble cellodextrins into glucose.
• endoglucanases EC 3.2.1.4
• cellobiohydrolases EC 3.2.1.91
• beta-glucosidases EC 3.2.1.21
• cellobiohydrolases seems to be the key enzymes for degrading native crystalline cellulose.
• the cellulolytic activity may, in a preferred embodiment, be in the form of a preparation of enzymes of fungal origin, such as from a strain of Trichoderma , preferably a strain of Trichoderma reesei ; a strain of Humicola , such as a strain of Humicola insolens ; or a strain of Chrysosporium , preferably a strain of Chrysosporium lucknowense.
• the cellulolytic enzyme preparation contains one or more of the following activities: cellulase, hemicellulase, cellulolytic enzyme enhancing activity, beta-glucosidase, endoglucanase, cellubiohydrolase, or xylose isomerase.
• the cellulase may be a composition as defined in PCT/US2008/065417, which is hereby incorporated by reference.
• the cellulolytic enzyme preparation comprises a polypeptide having cellulolytic enhancing activity, preferably a family GH61A polypeptide, preferably the one disclosed in WO 2005/074656 (Novozymes).
• the cellulolytic enzyme preparation may further comprise a beta-glucosidase, such as a beta-glucosidase derived from a strain of Aspergillus, Penicillium , or Trichoderma , including the fusion protein having beta-glucosidase activity disclosed in WO 2008/057637.
• the cellulolytic enzyme preparation may also comprises a CBH II enzyme, preferably Thielavia terrestris cellobiohydrolase II CEL6A.
• the cellulolytic enzyme preparation may also comprise cellulolytic enzymes, preferably derived from Trichoderma reesei or Humicola insolens.
• the cellulolytic enzyme preparation may also comprise a polypeptide having cellulolytic enhancing activity (GH61A) disclosed in WO 2005/074656; a beta-glucosidase (fusion protein disclosed in WO 2008/057637); and cellulolytic enzymes derived from Trichoderma reesei.
• G61A cellulolytic enhancing activity
• beta-glucosidase fusion protein disclosed in WO 2008/057637
• cellulolytic enzymes derived from Trichoderma reesei may also comprise a polypeptide having cellulolytic enhancing activity (GH61A) disclosed in WO 2005/074656; a beta-glucosidase (fusion protein disclosed in WO 2008/057637); and cellulolytic enzymes derived from Trichoderma reesei.
• the cellulolytic enzyme is the commercially available product CELLUCLAST® 1.5 L, CELLUZYMETM, CTEC or CTEC2 available from Novozymes A/S, Denmark or ACCELERASETM 1000 (from Genencor Inc., USA).
• a cellulolytic enzyme may be added during fermentation.
• the cellulolytic enzyme may be dosed in the range from 0.1-100 FPU per gram total solids (TS), preferably 0.5-50 FPU per gram TS, especially 1-20 FPU per gram TS.
• TS FPU per gram total solids
• at least 0.1 mg cellulolytic enzyme per gram total solids (TS) preferably at least 3 mg cellulolytic enzyme per gram TS, such as between 5 and 10 mg cellulolytic enzyme(s) per gram TS is(are) used for hydrolysis.
• Any endoglucanase described above can be used for hydrolyzing a lignocellulosic material.
• cellobiohydrolase means a 1,4-beta-D-glucan cellobiohydrolase (E.C. 3.2.1.91), which catalyzes the hydrolysis of 1,4-beta-D-glucosidic linkages in cellulose, cellooligosaccharides, or any beta-1,4-linked glucose containing polymer, releasing cellobiose from the reducing or non-reducing ends of the chain.
• cellobiohydroloses examples include CBH I and CBH II from Trichoderma reseei; Humicola insolens and CBH II from Thielavia terrestris cellobiohydrolase (CELL6A).
• Cellobiohydrolase activity may be determined according to the procedures described by Lever et al., 1972 , Anal. Biochem. 47: 273-279 and by van Tilbeurgh et al., 1982 , FEBS Letters 149: 152-156; van Tilbeurgh and Claeyssens, 1985 , FEBS Letters 187: 283-288.
• the Lever et al. method is suitable for assessing hydrolysis of cellulose in corn stover and the method of van Tilbeurgh et al. is suitable for determining the cellobiohydrolase activity on a fluorescent disaccharide derivative.
• beta-glucosidase means a beta-D-glucoside glucohydrolase (E.C. 3.2.1.21), which catalyzes the hydrolysis of terminal non-reducing beta-D-glucose residues with the release of beta-D-glucose.
• beta-glucosidase activity is determined according to the basic procedure described by Venturi et al., 2002 , J. Basic Microbiol. 42: 55-66, except different conditions were employed as described herein.
• beta-glucosidase activity is defined as 1.0 micro-mole of p-nitrophenol produced per minute at 50° C., pH 5 from 4 mM p-nitrophenyl-beta-D-glucopyranoside as substrate in 100 mM sodium citrate, 0.01% TWEEN® 20.
• beta-glucosidase is of fungal origin, such as a strain of Aspergillus, Penicillium , or Trichoderma .
• the beta-glucosidase is a derived from Trichoderma reesei , such as the beta-glucosidase encoded by the bgl1 gene (see FIG. 1 of EP 562003).
• beta-glucosidase is derived from Aspergillus oryzae (recombinantly produced in Aspergillus oryzae according to WO 2002/095014), Aspergillus fumigatus (recombinantly produced in Aspergillus oryzae according to Example 22 of WO 2002/095014) or Aspergillus niger (1981 , J. Appl. 3: 157-163).
• Xylose isomerases (D-xylose ketoisomerase) (E.C. 5.3.1.5) are enzymes that catalyze the reversible isomerization reaction of D-xylose to D-xylulose. Some xylose isomerases also convert the reversible isomerization of D-glucose to D-fructose. Therefore, xylose isomarase is sometimes referred to as “glucose isomerase.”
• a xylose isomerase used in a method or process of the invention may be any enzyme having xylose isomerase activity and may be derived from any source, preferably bacterial or fungal origin, such as filamentous fungi or yeast.
• bacterial xylose isomerases include the ones belonging to Actinoplanes, Bacillus, Flavobacterium, Streptomyces , and Thermotoga , including T. neapolitana (Vieille et al., 1995 , Appl. Environ. Microbiol. 61(5): 1867-1875) and T. maritime.
• fungal xylose isomerases are derived from Basidiomycetes.
• a preferred xylose isomerase is derived from a strain of Candida , preferably a strain of Candida boidinii , especially the Candida boidinii xylose isomerase disclosed by, e.g., Vongsuvanlert et al., 1988 , Agric. Biol. Chem. 52(7): 1817-1824.
• the xylose isomerase may be derived from a strain of Candida boidinii ( Kloeckera 2201), deposited as DSM 70034 and ATCC 48180, disclosed in Ogata et al., Agric. Biol. Chem. 33: 1519-1520 or Vongsuvanlert et al., 1988 , Agric. Biol. Chem. 52(2): 1519-1520.
• the xylose isomerase is derived from a strain of Streptomyces , e.g., derived from a strain of Streptomyces murinus (U.S. Pat. No. 4,687,742); S. flavovirens, S. albus, S. achromogenus, S. echinatus, S. wedmorensis all disclosed in U.S. Pat. No. 3,616,221.
• Other xylose isomerases are disclosed in U.S. Pat. No. 3,622,463, U.S. Pat. No. 4,351,903, U.S. Pat. No. 4,137,126, U.S. Pat. No. 3,625,828, HU patent no. 12,415, DE patent no. 2,417,642, JP patent no. 69,28,473, and WO 2004/044129 each incorporated by reference herein.
• the xylose isomerase may be either in immobilized or liquid form. Liquid form is preferred.
• SWEETZYMETM T from Novozymes A/S, Denmark.
• the xylose isomerase is added to provide an activity level in the range from 0.01-100 IGIU per gram total solids.
• any GH61 polypeptide can be used.
• the GH61 polypeptide comprises the following motifs:
• the GH61 polypeptide comprising the above-noted motifs may further comprise:
• X is any amino acid
• X(1,2) is any one or two contiguous amino acids
• X(3) is any three contiguous amino acids
• X(2) is any two contiguous amino acids.
• the GH61 polypeptide further comprises H-X(1,2)-G-P-X(3)-[YW]-[AILMV]. In another preferred aspect, the GH61 polypeptide further comprises [EQ]-X-Y-X(2)-C-X-[EHQN]-[FILV]-X-[ILV]. In another preferred aspect, the GH61 polypeptide further comprises H-X(1,2)-G-P-X(3)-[YW]-[AILMV] and [EQ]-X-Y-X(2)-C-X-[EHQN]-[FILV]-X-[ILV].
• the GH61 polypeptide comprises the following motif:
• the GH61 polypeptide comprises an amino acid sequence that has a degree of identity to the mature polypeptide of SEQ ID NO: 1 ( Thielavia terrestris ), SEQ ID NO: 2 ( Thielavia terrestris ), SEQ ID NO: 3 ( Thielavia terrestris ), SEQ ID NO: 4 ( Thielavia terrestris ), SEQ ID NO: 5 ( Thielavia terrestris ), SEQ ID NO: 6 ( Thielavia terrestris ), SEQ ID NO: 7 ( Thermoascus aurantiacus ), SEQ ID NO: 8 ( Trichoderma reesei ), SEQ ID NO: 9 ( Myceliophthora thermophila ), SEQ ID NO: 10 ( Myceliophthora thermophila ), SEQ ID NO: 11 ( Myceliophthora thermophila ), SEQ ID NO: 12 ( Myceliophthora thermophila ), SEQ ID NO: 13 ( Myceliophthora
• the GH61 polypeptide is an artificial variant comprising a substitution, deletion, and/or insertion of one or more (or several) amino acids of the mature polypeptide of SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11, SEQ ID NO: 12, SEQ ID NO: 13, SEQ ID NO: 14, SEQ ID NO: 15, SEQ ID NO: 16, SEQ ID NO: 17, SEQ ID NO: 18, SEQ ID NO: 19, SEQ ID NO: 20, SEQ ID NO: 21, SEQ ID NO: 22, SEQ ID NO: 23, SEQ ID NO: 24, SEQ ID NO: 25, SEQ ID NO: 26, SEQ ID NO: 27, SEQ ID NO: 28, SEQ ID NO: 29, SEQ ID NO: 30, SEQ ID NO: 31, or SEQ ID NO: 32; or a homologous sequence thereof.
• amino acid changes are of a minor nature, that is conservative amino acid substitutions or insertions that do not significantly affect the folding and/or activity of the protein; small deletions, typically of one to about 30 amino acids; small amino- or carboxyl-terminal extensions, such as an amino-terminal methionine residue; a small linker peptide of up to about 20-25 residues; or a small extension that facilitates purification by changing net charge or another function, such as a poly-histidine tract, an antigenic epitope or a binding domain.
• conservative substitutions are within the group of basic amino acids (arginine, lysine and histidine), acidic amino acids (glutamic acid and aspartic acid), polar amino acids (glutamine and asparagine), hydrophobic amino acids (leucine, isoleucine and valine), aromatic amino acids (phenylalanine, tryptophan and tyrosine), and small amino acids (glycine, alanine, serine, threonine and methionine).
• Amino acid substitutions that do not generally alter specific activity are known in the art and are described, for example, by H. Neurath and R. L. Hill, 1979 , In, The Proteins , Academic Press, New York.
• the most commonly occurring exchanges are Ala/Ser, Val/Ile, Asp/Glu, Thr/Ser, Ala/Gly, Ala/Thr, Ser/Asn, Ala/Val, Ser/Gly, Tyr/Phe, Ala/Pro, Lys/Arg, Asp/Asn, Leu/Ile, Leu/Val, Ala/Glu, and Asp/Gly.
• amino acid changes are of such a nature that the physico-chemical properties of the polypeptides are altered.
• amino acid changes may improve the thermal stability of the polypeptide, alter the substrate specificity, change the pH optimum, and the like.
• Essential amino acids in a parent polypeptide can be identified according to procedures known in the art, such as site-directed mutagenesis or alanine-scanning mutagenesis (Cunningham and Wells, 1989 , Science 244: 1081-1085). In the latter technique, single alanine mutations are introduced at every residue in the molecule, and the resultant mutant molecules are tested for cellulolytic enhancing activity to identify amino acid residues that are critical to the activity of the molecule. See also, Hilton et al., 1996 , J. Biol. Chem. 271: 4699-4708.
• the active site of the enzyme or other biological interaction can also be determined by physical analysis of structure, as determined by such techniques as nuclear magnetic resonance, crystallography, electron diffraction, or photoaffinity labeling, in conjunction with mutation of putative contact site amino acids. See, for example, de Vos et al., 1992 , Science 255: 306-312; Smith et al., 1992 , J. Mol. Biol. 224: 899-904; Wlodaver et al., 1992 , FEBS Lett. 309: 59-64.
• the identities of essential amino acids can also be inferred from analysis of identities with polypeptides that are related to the parent polypeptide.
• Single or multiple amino acid substitutions, deletions, and/or insertions can be made and tested using known methods of mutagenesis, recombination, and/or shuffling, followed by a relevant screening procedure, such as those disclosed by Reidhaar-Olson and Sauer, 1988 , Science 241: 53-57; Bowie and Sauer, 1989 , Proc. Natl. Acad. Sci. USA 86: 2152-2156; WO 95/17413; or WO 95/22625.
• Other methods that can be used include error-prone PCR, phage display (e.g., Lowman et al., 1991 , Biochemistry 30: 10832-10837; U.S. Pat. No. 5,223,409; WO 92/06204), and region-directed mutagenesis (Derbyshire et al., 1986 , Gene 46: 145; Ner et al., 1988 , DNA 7: 127).
• Mutagenesis/shuffling methods can be combined with high-throughput, automated screening methods to detect activity of cloned, mutagenized polypeptides expressed by host cells (Ness et al., 1999 , Nature Biotechnology 17: 893-896). Mutagenized DNA molecules that encode active polypeptides can be recovered from the host cells and rapidly sequenced using standard methods in the art. These methods allow the rapid determination of the importance of individual amino acid residues in a polypeptide.
• the total number of amino acid substitutions, deletions and/or insertions of the mature GH61 polypeptide of SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11, SEQ ID NO: 12, SEQ ID NO: 13, SEQ ID NO: 14, SEQ ID NO: 15, SEQ ID NO: 16, SEQ ID NO: 17, SEQ ID NO: 18, SEQ ID NO: 19, SEQ ID NO: 20, SEQ ID NO: 21, SEQ ID NO: 22, SEQ ID NO: 23, SEQ ID NO: 24, SEQ ID NO: 25, SEQ ID NO: 26, SEQ ID NO: 27, SEQ ID NO: 28, SEQ ID NO: 29, SEQ ID NO: 30, SEQ ID NO: 31, or SEQ ID NO: 32 is not more than 4, e.g., 1, 2, 3, or 4.
• the GH61 polypeptide is used in the presence of a soluble activating divalent metal cation described in WO 2008/151043, e.g., manganese sulfate.
• the GH61 polypeptide is used in the presence of a dioxy compound, a bicylic compound, a heterocyclic compound, a nitrogen-containing compound, or a sulfur-containing compound.
• the dioxy compound may include any suitable compound containing two or more oxygen atoms.
• the dioxy compounds contain a substituted aryl moiety as described herein.
• the dioxy compounds may comprise one or more (several) hydroxyl and/or hydroxyl derivatives, but also include substituted aryl moieties lacking hydroxyl and hydroxyl derivatives.
• Non-limiting examples of dioxy compounds include pyrocatechol or catechol; caffeic acid; 3,4-dihydroxybenzoic acid; 4-tert-butyl-5-methoxy-1,2-benzenediol; pyrogallol; gallic acid; methyl-3,4,5-trihydroxybenzoate; 2,3,4-trihydroxybenzophenone; 2,6-dimethoxyphenol; sinapinic acid; 3,5-dihydroxybenzoic acid; 4-chloro-1,2-benzenediol; 4-nitro-1,2-benzenediol; tannic acid; ethyl gallate; methyl glycolate; dihydroxyfumaric acid; 2-butyne-1,4-diol; (croconic acid; 1,3-propanediol; tartaric acid; 2,4-pentanediol; 3-ethyoxy-1,2-propanediol; 2,4,4′-trihydroxybenzophenone; cis-2-butene-1,4-di
• the bicyclic compound may include any suitable substituted fused ring system as described herein.
• the compounds may comprise one or more (several) additional rings, and are not limited to a specific number of rings unless otherwise stated.
• the bicyclic compound is a flavonoid.
• the bicyclic compound is an optionally substituted isoflavonoid.
• the bicyclic compound is an optionally substituted flavylium ion, such as an optionally substituted anthocyanidin or optionally substituted anthocyanin, or derivative thereof.
• Non-limiting examples of bicyclic compounds include epicatechin; quercetin; myricetin; taxifolin; kaempferol; morin; acacetin; naringenin; isorhamnetin; apigenin; cyanidin; cyanin; kuromanin; (keracyanin; or a salt or solvate thereof.
• the heterocyclic compound may be any suitable compound, such as an optionally substituted aromatic or non-aromatic ring comprising a heteroatom, as described herein.
• the heterocyclic is a compound comprising an optionally substituted heterocycloalkyl moiety or an optionally substituted heteroaryl moiety.
• the optionally substituted heterocycloalkyl moiety or optionally substituted heteroaryl moiety is an optionally substituted 5-membered heterocycloalkyl or an optionally substituted 5-membered heteroaryl moiety.
• the optionally substituted heterocycloalkyl or optionally substituted heteroaryl moiety is an optionally substituted moiety selected from pyrazolyl, furanyl, imidazolyl, isoxazolyl, oxadiazolyl, oxazolyl, pyrrolyl, pyridyl, pyrimidyl, pyridazinyl, thiazolyl, triazolyl, thienyl, dihydrothieno-pyrazolyl, thianaphthenyl, carbazolyl, benzimidazolyl, benzothienyl, benzofuranyl, indolyl, quinolinyl, benzotriazolyl, benzothiazolyl, benzooxazolyl, benzimidazolyl, isoquinolinyl, isoindolyl, acridinyl, benzoisazolyl, dimethylhydantoin, pyrazinyl,
• the optionally substituted heterocycloalkyl moiety or optionally substituted heteroaryl moiety is an optionally substituted furanyl.
• heterocyclic compounds include (1,2-dihydroxyethyl)-3,4-dihydroxyfuran-2(5H)-one; 4-hydroxy-5-methyl-3-furanone; 5-hydroxy-2(5H)-furanone; [1,2-dihydroxyethyl]furan-2,3,4(5H)-trione; ⁇ -hydroxy- ⁇ -butyrolactone; ribonic ⁇ -lactone; aldohexuronicaldohexuronic acid ⁇ -lactone; gluconic acid ⁇ -lactone; 4-hydroxycoumarin; dihydrobenzofuran; 5-(hydroxymethyl)furfural; furoin; 2(5H)-furanone; 5,6-dihydro-2H-pyran-2-one; and 5,6-dihydro-4-hydroxy-6-methyl-2H-pyran-2-one; or a
• the nitrogen-containing compound may be any suitable compound with one or more nitrogen atoms.
• the nitrogen-containing compound comprises an amine, imine, hydroxylamine, or nitroxide moiety.
• nitrogen-containing compounds include acetone oxime; violuric acid; pyridine-2-aldoxime; 2-aminophenol; 1,2-benzenediamine; 2,2,6,6-tetramethyl-1-piperidinyloxy; 5,6,7,8-tetrahydrobiopterin; 6,7-dimethyl-5,6,7,8-tetrahydropterine; and maleamic acid; or a salt or solvate thereof.
• the quinone compound may be any suitable compound comprising a quinone moiety as described herein.
• suitable compounds include 1,4-benzoquinone; 1,4-naphthoquinone; 2-hydroxy-1,4-naphthoquinone; 2,3-dimethoxy-5-methyl-1,4-benzoquinone or coenzyme Q 0 ; 2,3,5,6-tetramethyl-1,4-benzoquinone or duroquinone; 1,4-dihydroxyanthraquinone; 3-hydroxy-1-methyl-5,6-indolinedione or adrenochrome; 4-tert-butyl-5-methoxy-1,2-benzoquinone; pyrroloquinoline quinone; or a salt or solvate thereof.
• the sulfur-containing compound may be any suitable compound comprising one or more sulfur atoms.
• the sulfur-containing comprises a moiety selected from thionyl, thioether, sulfinyl, sulfonyl, sulfamide, sulfonamide, sulfonic acid, and sulfonic ester.
• Non-limiting examples of sulfur-containing compounds include ethanethiol; 2-propanethiol; 2-propene-1-thiol; 2-mercaptoethanesulfonic acid; benzenethiol; benzene-1,2-dithiol; cysteine; methionine; glutathione; cystine; or a salt or solvate thereof.
• the GH61 polypeptide is present in the amount of 2-1000 micrograms/g dry solids (DS), e.g., 5-100, 10-40, or 20-40 micrograms/g DS.
• DS dry solids
• alpha-amylase may be used to convert a starch-containing material to dextrins.
• Preferred alpha-amylases are of microbial, such as bacterial or fungal origin. The most suitable alpha-amylase depends on the process conditions but can easily be determined by one skilled in the art.
• the preferred alpha-amylase is an acid alpha-amylase, e.g., fungal acid alpha-amylase or bacterial acid alpha-amylase.
• the phrase “acid alpha-amylase” means an alpha-amylase (E.C. 3.2.1.1) which has optimum activity at a pH in the range of 3 to 7, preferably from 3.5 to 6, or more preferably from 4-5.
• the alpha-amylase is of Bacillus origin.
• the Bacillus alpha-amylase may preferably be derived from a strain of B. amyloliquefaciens, B. licheniformis, B. stearothermophilus , or B. subtilis , but may also be derived from other Bacillus sp.
• contemplated alpha-amylases include the Bacillus licheniformis alpha-amylase shown in SEQ ID NO: 4 in WO 99/19467, the Bacillus amyloliquefaciens alpha-amylase SEQ ID NO: 5 in WO 99/19467 and the Bacillus stearothermophilus alpha-amylase shown in SEQ ID NO: 3 in WO 99/19467 (all sequences are hereby incorporated by reference).
• the alpha-amylase may be an enzyme having a degree of identity of at least 60%, preferably at least 70%, more preferred at least 80%, even more preferred at least 90%, such as at least 95%, at least 96%, at least 97%, at least 98% or at least 99% to any of the sequences shown in SEQ ID NO: 3, 4 or 5, respectively, in WO 99/19467.
• the Bacillus alpha-amylase may also be a variant and/or hybrid, especially one described in any of WO 96/23873, WO 96/23874, WO 97/41213, WO 99/19467, WO 00/60059, and WO 02/10355 (all documents are hereby incorporated by reference). Specifically contemplated alpha-amylase variants are disclosed in U.S. Pat. No.
• BSG alpha-amylase Bacillus stearothermophilus alpha-amylase (BSG alpha-amylase) variants having a deletion of one or two amino acids in positions R179 to G182, preferably a double deletion disclosed in WO 96/23873-see e.g., page 20, lines 1-10 (hereby incorporated by reference), preferably corresponding to delta(181-182) compared to the wild-type BSG alpha-amylase amino acid sequence set forth in SEQ ID NO: 3 disclosed in WO 99/19467 or deletion of amino acids R179 and G180 using SEQ ID NO: 3 in WO 99/19467 for numbering (which reference is hereby incorporated by reference).
• BSG alpha-amylase Bacillus stearothermophilus alpha-amylase
• Bacillus alpha-amylases especially Bacillus stearothermophilus alpha-amylase, which have a double deletion corresponding to delta(181-182) and further comprise a N193F substitution (also denoted 1181*+G182*+N193F) compared to the wild-type BSG alpha-amylase amino acid sequence set forth in SEQ ID NO: 3 disclosed in WO 99/19467.
• a hybrid alpha-amylase specifically contemplated comprises 445 C-terminal amino acid residues of the Bacillus licheniformis alpha-amylase (shown in SEQ ID NO: 4 of WO 1999/19467) and the 37 N-terminal amino acid residues of the alpha-amylase derived from Bacillus amyloliquefaciens (shown in SEQ ID NO: 5 of WO 99/19467), with one or more, especially all, of the following substitutions: G48A+T49I+G107A+H156Y+A181T+N190F+1201F+A209V+Q264S (using the Bacillus licheniformis numbering in SEQ ID NO: 4 of WO 99/19467).
• variants having one or more of the following mutations (or corresponding mutations in other Bacillus alpha-amylase backbones): H154Y, A181T, N190F, A209V and Q264S and/or a deletion of two residues between positions 176 and 179, preferably a deletion of E178 and G179 (using the SEQ ID NO: 5 numbering of WO 99/19467).
• Fungal alpha-amylases include alpha-amylases derived from a strain of Aspergillus , such as, Aspergillis kawachii, Aspergillus niger , and Aspergillus oryzae.
• a preferred acidic fungal alpha-amylase is a Fungamyl-like alpha-amylase which is derived from a strain of Aspergillus oryzae .
• the phrase “Fungamyl-like alpha-amylase” indicates an alpha-amylase which exhibits a high identity, i.e., more than 70%, more than 75%, more than 80%, more than 85% more than 90%, more than 95%, more than 96%, more than 97%, more than 98%, more than 99% or even 100% identity to the mature part of the amino acid sequence shown in SEQ ID NO: 10 in WO 96/23874.
• Another preferred acidic alpha-amylase is derived from a strain of Aspergillus niger .
• the acid fungal alpha-amylase is the one from A. niger disclosed as “AMYA_ASPNG” in the Swiss-prot/TeEMBL database under the primary accession no. P56271 and described in WO 89/01969 (Example 3).
• a commercially available acid fungal alpha-amylase derived from Aspergillus niger is SP288 (available from Novozymes A/S, Denmark).
• wild-type alpha-amylases include those derived from a strain of the genera Rhizomucor and Meripilus , preferably a strain of Rhizomucor pusillus (WO 2004/055178 incorporated by reference) or Meripilus giganteus.
• the alpha-amylase is derived from Aspergillus kawachii and disclosed by Kaneko et al., 1996 , J. Ferment. Bioeng. 81: 292-298, “Molecular-cloning and determination of the nucleotide-sequence of a gene encoding an acid-stable alpha-amylase from Aspergillus kawachii ”; and further as EMBL:#AB008370.
• the fungal alpha-amylase may also be a wild-type enzyme comprising a starch-binding domain (SBO) and an alpha-amylase catalytic domain (i.e., non-hybrid), or a variant thereof.
• SBO starch-binding domain
• alpha-amylase catalytic domain i.e., non-hybrid
• the wild-type alpha-amylase is derived from a strain of Aspergillus kawachii.
• the fungal acid alpha-amylase is a hybrid alpha-amylase.
• Preferred examples of fungal hybrid alpha-amylases include the ones disclosed in WO 2005/003311 or U.S. Application Publication No. 2005/0054071 (Novozymes) or U.S. application No. 60/638,614 (Novozymes), which are hereby incorporated by reference.
• a hybrid alpha-amylase may comprise an alpha-amylase catalytic domain (CO) and a carbohydrate-binding domain/module (CBM), such as a starch binding domain, and optionally a linker.
• CO alpha-amylase catalytic domain
• CBM carbohydrate-binding domain/module
• contemplated hybrid alpha-amylases include those disclosed in Tables 1 to 5 of the examples in U.S. patent application No. 60/638,614, including Fungamyl variant with catalytic domain JA118 and the Athelia rolfsii SBD (SEQ ID NO: 100 in U.S. application No. 60/638,614), Rhizomucor pusillus alpha-amylase with Athelia rolfsii AMG linker and SBD (SEQ ID NO: 101 in U.S. Application No.
• Rhizomucor pusillus alpha-amylase with Aspergillus niger glucoamylase linker and SBD which is disclosed in Table 5 as a combination of amino acid sequences SEQ ID NO: 20, SEQ ID NO: 72 and SEQ ID NO: 96 in U.S. application Ser. No. 11/316,535) or as V039 in Table 5 in WO 2006/069290, and Meripilus giganteus alpha-amylase with Athelia rolfsii glucoamylase linker and SBD (SEQ ID NO: 102 in U.S. application No. 60/638,614).
• Other specifically contemplated hybrid alpha-amylases are any of the ones listed in Tables 3, 4, 5, and 6 in Example 4 in U.S. application Ser. No. 11/316,535 and WO 2006/069290, each hereby incorporated by reference.
• contemplated hybrid alpha-amylases include those disclosed in U.S. application publication no. 2005/0054071, including those disclosed in Table 3 on page 15, such as Aspergillus niger alpha-amylase with Aspergillus kawachii linker and starch binding domain.
• alpha-amylases which exhibit a high identity to any of the above-mentioned alpha-amylases, i.e., more than 70%, more than 75%, more than 80%, more than 85%, more than 90%, more than 95%, more than 96%, more than 97%, more than 98%, more than 99% or even 100% identity to the mature enzyme sequences.
• An acid alpha-amylases may according to the invention be added in an amount of 0.1 to 10 AFAU/g DS, preferably 0.10 to 5 AFAU/g DS, especially 0.3 to 2 AFAU/g DS.
• Preferred commercial compositions comprising alpha-amylase include MYCOLASE from DSM, BANTM, TERMAMYLTM SC, FUNGAMYLTM, LIQUOZYMETM X, SANTM SUPER, and SANTM EXTRA L (Novozymes A/S) and CLARASETM L-40,000, DEX-LOTM, SPEZYMETM FRED, SPEZYMETM AA, SPEZYMETM, DELTA AA GC358 and Clearflow AA (Genencor Int.), and the acid fungal alpha-amylase sold under the trade name SP288 (available from Novozymes A/S, Denmark).
• SP288 available from Novozymes A/S, Denmark
• Phytases are enzymes that degrade phytates and/or phytic acid by specifically hydrolyzing the ester link between inositol and phosphorus. Phytase activity is credited with phosphorus and ion availability in many ingredients.
• the phytase is capable of liberating at least one inorganic phosphate from an inositol hexaphosphate (e.g., phytic acid).
• Phytases can be grouped according to their preference for a specific position of the phosphate ester group on the phytate molecule at which hydrolysis is initiated (e.g., 3-phytase (EC 3.1.3.8) or 6-phytase (EC 3.1.3.26)).
• 3-phytase EC 3.1.3.8
• 6-phytase EC 3.1.3.26
• An example of phytase is myo-inositol-hexakiphosphate-3-phosphohydrolase.
• Phytases can be obtained from microorganisms such as fungal and bacterial organisms.
• the phytase may be obtained from filamentous fungi such as Aspergillus (e.g., A. ficuum, A. fumigatus, A. niger , and A. terreus ), Cladospirum, Mucor (e.g., Mucor piriformis ), Myceliophthora (e.g., M. thermophila ), Penicillium (e.g., P. hordei (ATCC No. 22053)), P. piceum (ATCC No. 10519), or P. brevi - compactum (ATCC No. 48944), Talaromyces (e.g., T. thermophilus ), Thermomyces (WO 99/49740), and Trichoderma spp. (e.g., T. reesei ).
• filamentous fungi such as Aspergillus (e.
• the phytate-degrading enzyme is obtained from yeast (e.g., Arxula adeninivorans, Pichia anomala, Schwanniomyces occidentalis ), gram-negative bacteria (e.g., Escherichia coli, Klebsiella spp., Pseudomonas spp.), and gram-positive bacteria (e.g., Bacillus spp. such as Bacillus subtilis ).
• yeast e.g., Arxula adeninivorans, Pichia anomala, Schwanniomyces occidentalis
• gram-negative bacteria e.g., Escherichia coli, Klebsiella spp., Pseudomonas spp.
• gram-positive bacteria e.g., Bacillus spp. such as Bacillus subtilis
• the phytase also may be obtained from Citrobacter, Enterbacter , or Peniophora.
• the phytase is derived from Buttiauxiella spp. such as B. agrestis, B. brennerae, B. ferragutiase, B. gaviniae, B. izardii, B. noackiae , and B. warmboldiae .
• the phytase is a phytase disclosed in WO 2006/043178 or U.S. application Ser. No. 11/714,487.
• the phytase has at least 75%, at least 80%, at least 85%, at least 88%, at least 90%, at least 93%, at least 95%, at least 96%, at least 97%, at least 98% and at least 99% sequence identity to the amino acid sequence set forth in SEQ ID NO: 31 of U.S. application Ser. No. 12/263,886.
• phytases are NATUPHOS (BASF), RONOZYME P (Novozymes A/S), PHZYME (Danisco A/S, Diversa) and FINASE (AB Enzymes).
• BASF BASF
• RONOZYME P Novozymes A/S
• PHZYME Danisco A/S, Diversa
• FINASE AB Enzymes.
• the method for determining microbial phytase activity and the definition of a phytase unit is disclosed in Engelen et al., 1994 , Journal of AOAC International 77: 760-764.
• the phytase may be a wild-type phytase, an active variant or active fragment thereof.
• the pullulanase is a GH57 pullulanase, e.g., a pullulanase obtained from a strain of Thermococcus , including Thermococcus sp. AM4, Thermococcus sp.
• Thermococcus barophilus Thermococcus gammatolerans, Thermococcus hydrothermalis; Thermococcus kodakarensis, Thermococcus litoralis , and Thermococcus onnurineus ; or from a strain of Pyrococcus , such as Pyrococcus abyssi and Pyrococcus furiosus.
• carbohydrate-source generating enzyme includes glucoamylase (a glucose generator), beta-amylase and maltogenic amylase (both maltose generators) and also pullulanase and alpha-glucosidase.
• a carbohydrate-source generating enzyme is capable of producing a carbohydrate that can be used as an energy-source by the fermenting organism(s) in question, for instance, when used in a process for producing a fermentation product such as ethanol.
• the generated carbohydrate may be converted directly or indirectly to the desired fermentation product, preferably ethanol.
• a mixture of carbohydrate-source generating enzymes may be present.
• mixtures are mixtures of at least a glucoamylase and an alpha-amylase, especially an acid amylase, even more preferred an acid fungal alpha-amylase.
• the ratio between acidic fungal alpha-amylase activity (AFAU) per glucoamylase activity (AGU) (AFAU per AGU) may be at least 0.1, in particular at least 0.16, such as in the range from 0.12 to 0.50 or greater.
• a glucoamylase may be derived from any suitable source, e.g., derived from a microorganism or a plant.
• Preferred glucoamylases are of fungal or bacterial origin selected from the group consisting of Aspergillus glucoamylases, in particular A. niger G1 or G2 glucoamylase (Boel et al., 1984 , EMBO J. 3(5): 1097-1102), and variants thereof, such as those disclosed in WO 92/00381, WO 2000/104136 and WO 2001/04273 (from Novozymes, Denmark); the A. awamori glucoamylase disclosed in WO 84/02921, A.
• oryzae glucoamylase Agric. Biol. Chem. 55(4): 941-949 (1991)
• variants or fragments thereof Other Aspergillus glucoamylase variants include variants with enhanced thermal stability: G137A and G139A (Chen et al., 1996 , Prot. Eng. 9: 499-505); D257E and D293E/Q (Chen et al., 1995 , Prot. Eng. 8: 575-582); N182 (Chen et al., 1994 , Biochem. J.
• glucoamylases include Athelia rolfsii (previously denoted Corticium rolfsii ) glucoamylase (see U.S. Pat. No. 4,727,026 and Nagasaka et al., 1998, “Purification and properties of the raw-starch-degrading glucoamylases from Corticium rolfsii, Appl. Microbiol. Biotechnol. 50:323-330), Talaromyces glucoamylases , in particular derived from Talaromyces emersonii (WO 99/28448), Talaromyces leycettanus (U.S. Pat. No. Re. 32,153), Talaromyces duponti , and Talaromyces thermophilus (U.S. Pat. No. 4,587,215).
• Bacterial glucoamylases include glucoamylases from Clostridium , in particular C. thermoamylolyticum (EP 135,138), and C. thermohydrosulfuricum (WO 86/01831) and Trametes cingulata disclosed in WO 2006/069289 (which are hereby incorporated by reference).
• Hybrid glucoamylases may also be used in a process of the invention.
• Examples of hybrid glucoamylases are disclosed in WO 2005/045018. Specific examples include the hybrid glucoamylase disclosed in Tables 1 and 4 of Example 1 of WO 2005/045018, which is hereby incorporated by reference to the extent it teaches hybrid glucoamylases.
• glucoamylases which exhibit a high identity to any of above-mentioned glucoamylases, i.e., more than 70%, more than 75%, more than 80%, more than 85%, more than 90%, more than 95%, more than 96%, more than 97%, more than 98%, more than 99% or even 100% identity to the mature enzymes sequences.
• compositions comprising glucoamylase include AMG 200L; AMG L; SANTM SUPER, SANTM EXTRA L, SPIRIZYMETM PLUS, SPIRIZYMETM FUEL, SPIRIZYMETM B4U and AMGTM E (from Novozymes A/S); OPTIDEXTM 300 (from Genencor Int.); AMIGASETM and AMIGASETM PLUS (from DSM); G-ZYMETM G900, G-ZYMETM, GC480, GC148, GC019 and G990 ZR (from Genencor Int.).
• Glucoamylases may be added in an amount of 0.02-20 AGU/g DS, preferably 0.1-10 AGU/g DS, especially between 1-5 AGU/g DS, such as 0.5 AGU/g DS.
• beta-amylase (E.C. 3.2.1.2) is the name traditionally given to exo-acting maltogenic amylases, which catalyze the hydrolysis of 1,4-alpha-glucosidic linkages in amylose, amylopectin and related glucose polymers. Maltose units are successively removed from the non-reducing chain ends in a step-wise manner until the molecule is degraded or, in the case of amylopectin, until a branch point is reached. The maltose released has the beta anomeric configuration, hence the name beta-amylase.
• Beta-amylases have been isolated from various plants and microorganisms (Fogarty and Kelly, 1979 , Progress in Industrial Microbiology 15: 112-115). These beta-amylases are characterized by having optimum temperatures in the range from 40° C. to 65° C. and optimum pH in the range from 4.5 to 7.
• a commercially available beta-amylase from barley is NOVOZYMTM WBA from Novozymes A/S, Denmark and SPEZYMETM BBA 1500 from Genencor Int., USA.
• the amylase may also be a maltogenic alpha-amylase.
• a maltogenic alpha-amylase (glucan 1,4-alpha-maltohydrolase, E.C. 3.2.1.133) is able to hydrolyze amylose and amylopectin to maltose in the alpha-configuration.
• a maltogenic amylase from Bacillus stearothermophilus strain NCIB 11837 is commercially available from Novozymes A/S. Maltogenic alpha-amylases are described in U.S. Pat. Nos. 4,598,048, 4,604,355 and 6,162,628, which are hereby incorporated by reference.
• the maltogenic amylase may be added in an amount of 0.05-5 mg total protein/gram DS or 0.05-5 MANU/g DS.
• a protease may be added during saccharification, fermentation, simultaneous saccharification and fermentation.
• the protease may be added to deflocculate the fermenting organism, especially yeast, during fermentation.
• the protease may be any protease.
• the protease is an acid protease of microbial origin, preferably of fungal or bacterial origin. An acid fungal protease is preferred, but also other proteases can be used.
• Suitable proteases include microbial proteases, such as fungal and bacterial proteases.
• Preferred proteases are acidic proteases, i.e., proteases characterized by the ability to hydrolyze proteins under acidic conditions below pH 7.
• Contemplated acid fungal proteases include fungal proteases derived from Aspergillus, Candida, Coriolus, Endothia, Enthomophtra, Irpex, Mucor, Penicillium, Rhizopus, Sclerotium and Torulopsis .
• proteases derived from Aspergillus niger see, e.g., Koaze et al., 1964 , Agr. Biol. Chem. Japan 28: 216), Aspergillus saitoi (see, e.g., Yoshida, 1954 , J. Agr. Chem. Soc.
• Japan 28: 66 Aspergillus awamori (Hayashida et al., 1977 , Agric. Biol. Chem. 42(5): 927-933), Aspergillus aculeatus (WO 95/02044), or Aspergillus oryzae , such as the pepA protease; and acidic proteases from Mucor pusillus or Mucor miehei.
• Contemplated are also neutral or alkaline proteases, such as a protease derived from a strain of Bacillus .
• a particular protease contemplated for the invention is derived from Bacillus amyloliquefaciens and has the sequence obtainable at Swissprot as Accession No. P06832.
• proteases having at least 90% identity to the amino acid sequence obtainable at Swissprot as Accession No. P06832 such as at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, or particularly at least 99% identity.
• proteases having at least 90% identity to amino acid sequence disclosed as SEQ ID NO:1 in WO 2003/048353 such as at 92%, at least 95%, at least 96%, at least 97%, at least 98%, or particularly at least 99% identity.
• papain-like proteases such as proteases within E.C. 3.4.22.* (cysteine protease), such as EC 3.4.22.2 (papain), EC 3.4.22.6 (chymopapain), EC 3.4.22.7 (asclepain), EC 3.4.22.14 (actinidain), EC 3.4.22.15 (cathepsin L), EC 3.4.22.25 (glycyl endopeptidase) and EC 3.4.22.30 (caricain).
• cyste protease such as EC 3.4.22.2 (papain), EC 3.4.22.6 (chymopapain), EC 3.4.22.7 (asclepain), EC 3.4.22.14 (actinidain), EC 3.4.22.15 (cathepsin L), EC 3.4.22.25 (glycyl endopeptidase) and EC 3.4.22.30 (caricain).
• the protease is a protease preparation derived from a strain of Aspergillus , such as Aspergillus oryzae .
• the protease is derived from a strain of Rhizomucor , preferably Rhizomucor meihei .
• the protease is a protease preparation, preferably a mixture of a proteolytic preparation derived from a strain of Aspergillus , such as Aspergillus oryzae , and a protease derived from a strain of Rhizomucor , preferably Rhizomucor meihei.
• Aspartic acid proteases are described in, for example, Handbook of Proteolytic Enzymes, Edited by A. J. Barrett, N. D. Rawlings and J. F. Woessner, Academic Press, San Diego, 1998, Chapter 270). Suitable examples of aspartic acid protease include, e.g., those disclosed in Berka et al., 1990 , Gene 96: 313; Berka et al., 1993 , Gene 125: 195-198; and Gomi et al., 1993 , Biosci. Biotech. Biochem. 57: 1095-1100, which are hereby incorporated by reference.
• the protease may be present in an amount of 0.0001-1 mg enzyme protein per 9 DS, preferably 0.001 to 0.1 mg enzyme protein per 9 DS.
• the protease may be present in an amount of 0.0001 to 1 LAPU/g DS, preferably 0.001 to 0.1 LAPU/g DS and/or 0.0001 to 1 mAU-RH/g DS, preferably 0.001 to 0.1 mAU-RH/g DS.
• a rolled filter paper strip (#1 Whatman; 1 ⁇ 6 cm; 50 mg) is added to the bottom of a test tube (13 ⁇ 100 mm). 2.2.2 To the tube is added 1.0 ml of 0.05 M sodium citrate buffer (pH 4.80). 2.2.3 The tubes containing filter paper and buffer are incubated 5 minutes at 50° C. ( ⁇ 0.1° C.) in a circulating water bath. 2.2.4 Following incubation, 0.5 ml of enzyme dilution in citrate buffer is added to the tube. Enzyme dilutions are designed to produce values slightly above and below the target value of 2.0 mg glucose. 2.2.5 The tube contents are mixed by gently vortexing for 3 seconds. 2.2.6 After vortexing, the tubes are incubated for 60 minutes at 50° C.
• a reagent blank is prepared by adding 1.5 ml of citrate buffer to a test tube.
• a substrate control is prepared by placing a rolled filter paper strip into the bottom of a test tube, and adding 1.5 ml of citrate buffer.
• Enzyme controls are prepared for each enzyme dilution by mixing 1.0 ml of citrate buffer with 0.5 ml of the appropriate enzyme dilution.
• the reagent blank, substrate control, and enzyme controls are assayed in the same manner as the enzyme assay tubes, and done along with them.
• Glucose standard tubes are prepared by adding 0.5 ml of each dilution to 1.0 ml of citrate buffer. 2.4.4 The glucose standard tubes are assayed in the same manner as the enzyme assay tubes, and done along with them.
• FPU/mL 0.37 enzyme dilution producing 2.0 mg glucose.
• Standard Dilution Obtain dilution ratio by dilution as: Concentration no. ratio Enzyme stock solution Diluent (EGU/mL) 1 0 0 1000 0.000 2 20 50 950 0.270 3 14 71 928 0.386 4 10 100 900 0.540 5 8 125 875 0.675 6 7 142 857 0.772 7 5 200 800 1.080
• the sample is prepared for the assay by allowing it to warm to room temperature.
• the sample is weighed out, diluted with 0.1 M phosphate pH 6.0 buffer and stirred for a minimum of 15 minutes with a maximum stir time of 30 minutes.
• the enzyme samples are diluted so that the activity of the final dilution is approximately in the middle of the curve. All weights and dilutions are recorded.
• Samples can be analyzed robotically using a ZYMATE II ROBOT (Zymark, USA), or manually according to the following specifications: A 0.375 ml volume of phosphate buffer is pipetted into a test tube. Next, 0.125 ml of the standard or sample is pipetted into the test tube with the phosphate buffer.
• Flask volume of solution flask (mL)
• BRIJ 35 working solution Two liters of 15% (w/v) BRIJ 35 working solution is prepared from a 30% (w/v) BRIJ 35 (Sigma B4184-1 L) stock solution by diluting with demineralized water.
• Five liters of sample diluents 50 mM ACES buffer with 225 mg BRIJ/L, pH 6.0) is prepared by weighing out 45.55 g ⁇ 0.005 g ACES and transferring the salt to a 5000 mL graduated flask. Approximately 4550 ml demineralized water is added and mixed with a magnetic stirrer for minimum 20 minutes or until dissolved. 7.50 ml of Brij 35 stock solution 15% (w/v) is pipetted into the solution. The pH is adjusted with sodium hydroxide to 6.00 ⁇ 0.03 at room temperature and the volume is adjusted to 5.0 I.
• 250 ml of 50 mM XYL-BUF/S: MES buffer, pH 6.0 is prepared by weighing out 2.441 g MES ⁇ 0.005 g and transferred to a 250 mL graduated flask. Approximately 240 ml demineralized water is added and mixed with a magnetic stirrer for minimum 20 minutes or until dissolved. The pH is adjusted with sodium hydroxide to 6.00 ⁇ 0.03 at room temperature and the volume is adjusted to 250 ml.
• XYL-SUB/S Substrate wheat arabinoxylan 5.60 g/l in MES buffer 50 mM, pH 6.0 is prepared by weighing out of 0.2800 g ⁇ 0.001 g of wheat arabinoxylan in a 100 ml beaker. The solution is stirred with heat in the beaker to approximately 55° C. for 30 minutes or until dissolved. After cooling, the pH is adjusted with sodium hydroxide to 6.00 ⁇ 0.03 at room temperature and the volume is adjusted to 50 ml. 50 ml of 500 mM NaOH is prepared by weighing 4 beads (pellets: fresh, not caked together) of NaOH (e.g., Merck 1.06498) to a 50 ml volumetric flask.
• NaOH e.g., Merck 1.06498
• the flask is filled up to 50*W+/ ⁇ 0.001 g weight with demineralized water and stirred with a magnetic stirrer for 5 minutes.
• PAHBAH/S PAHBAH/Bismuth/Tartrate solution is prepared by weighing out 0.1380 ⁇ 0.0001 g of Bismuth (III)-acetate (e.g., Aldrich 401587).
• PAHBAH PAHBAH
• a 1.2500 ⁇ 0,001 g quantity of potassium sodium tartrate, tetrahydrate is weighed out (Merck 1.08087, 282.2 g/mol).
• the powders are transferred to a 25 ml graduated flask. The flask is filled up to the mark with 500 mM NaOH and wrapped immediately in aluminium foil to protect from light or poured into a brown bottle. The sample is stirred for 15 minutes with a magnetic stirrer.
• An FXU standard is prepared by weighing out 0.4520 g ( ⁇ 0.0005 g) and dissolved in sample diluent in a 250 ml volumetric flask and stirred for 15 minutes.
• a standard curve is prepared with a 7 point curve with a factor 4.0 between lowest and highest standard point, the recommended volume 1200 microliters.
• the standard solutions are prepared by further diluting the stock solution with sample diluent on a diluter into the sample cups, according to the table below:
• a sample is weighed out and dissolved in sample diluent.
• the stock solution is stirred for 15 minutes.
• the working solution is diluted with the stock solution to lie within the range of the standard curve with sample diluent.
• the activity assay is carried out using a Konelab 30 analyzer (ThermoFischer Scientific). All reagents, standards and samples are placed in the analyzer.
• the enzyme activity of the diluted samples is read from the standard curve. The results can be calculated automatically. Calculation of activity of a sample in FXU/g is performed according to the formula:
• V Volume of the measuring flask used in mL
• Glucoamylase activity may be measured in AGI units or in Glucoamylase Units (AGU).
• AGI Glucoamylase activity
• Glucoamylase (equivalent to amyloglucosidase) converts starch into glucose.
• the amount of glucose is determined by the glucose oxidase method for the activity determination. The method described in the section 76-11 Starch-Glucoamylase Method with Subsequent Measurement of Glucose with Glucose Oxidase in “Approved methods of the American Association of Cereal Chemists”. Vol. 1-2 MCC, from American Association of Cereal Chemists, 2000; ISBN: 1-891127-12-8.
• AGI glucoamylase unit
• the starch should be Lintner starch, which is a thin-boiling starch used in the laboratory as a colorimetric indicator. Lintner starch is obtained by dilute hydrochloric acid treatment of native starch so that it retains the ability to color blue with iodine.
• the Novo Glucoamylase Unit is defined as the amount of enzyme, which hydrolyzes 1 micromole maltose per minute under the standard conditions 37° C., pH 4.3, substrate: 23.2 mM maltose, buffer: acetate 0.1 M, reaction time 5 minutes.
• An autoanalyzer system may be used. Mutarotase is added to the glucose dehydrogenase reagent so that any alpha-D-glucose present is turned into beta-D-glucose. Glucose dehydrogenase reacts specifically with beta-D-glucose in the reaction mentioned above, forming NADH which is determined using a photometer at 340 nm as a measure of the original glucose concentration.
• KNU Alpha-Amylase Activity
• the alpha-amylase activity may be determined using potato starch as substrate. This method is based on the degradation of modified potato starch by the enzyme, and the reaction is followed by mixing samples of the starch/enzyme solution with an iodine solution. Initially, a blackish-blue color is formed, but during the degradation of the starch the blue color gets weaker and gradually turns into a reddish-brown, which is compared to a colored glass standard.
• KNU Kilo Novo alpha-amylase Unit
• the activity of any acid alpha-amylase may be measured in AFAU (Acid Fungal Alpha-amylase Units).
• AFAU Acid Fungal Alpha-amylase Units
• AAU Acid Alpha-amylase Units
• AAU Acid Alpha-Amylase Units
• the acid alpha-amylase activity can be measured in AAU (Acid Alpha-amylase Units), which is an absolute method.
• AAU Acid Alpha-amylase Units
• One Acid Amylase Unit (AAU) is the quantity of enzyme converting 1 g of starch (100% of dry matter) per hour under standardized conditions into a product having a transmission at 620 nm after reaction with an iodine solution of known strength equal to the one of a color reference.
• Enzyme concentration 0.13-0.19 AAU/mL
• Enzyme working range 0.13-0.19 AAU/mL
• the starch should be Lintner starch. Further details can be found in EP 0140410, which is hereby incorporated by reference.
• Acid alpha-amylase activity may be measured in AFAU (Acid Fungal Alpha-amylase Units), which is determined relative to an enzyme standard.
• AFAU Acid Fungal Alpha-amylase Units
• One AFAU is defined as the amount of enzyme which degrades 5.260 mg starch dry matter per hour under the below mentioned standard conditions.
• Acid alpha-amylase an endo-alpha-amylase (1,4-alpha-D-glucan-glucanohydrolase, E.C. 3.2.1.1) hydrolyzes alpha-1,4-glucosidic bonds in the inner regions of the starch molecule to form dextrins and oligosaccharides with different chain lengths.
• the intensity of color formed with iodine is directly proportional to the concentration of starch.
• Amylase activity is determined using reverse colorimetry as a reduction in the concentration of starch under the specified analytical conditions.
• Substrate Soluble starch, approx. 0.17 g/l Buffer: Citrate, approx. 0.03 M
• Enzyme concentration 0.025 AFAU/ml
• Enzyme working range 0.01-0.04 AFAU/ml
• IGIU Xylose/Glucose Isomerase Assay
• One IGIU is the amount of enzyme which converts glucose to fructose at an initial rate of 1 micromole per minute at standard analytical conditions.
• Glucose concentration 45% w/w pH: 7.5
• LAPU Protease Assay Method
• LAPU Leucine Amino Peptidase Unit
• the proteolytic activity may be determined with denatured hemoglobin as substrate.
• Anson-Hemoglobin method for the determination of proteolytic activity denatured hemoglobin is digested, and the undigested hemoglobin is precipitated with trichloroacetic acid (TCA).
• TCA trichloroacetic acid
• the amount of TCA soluble product is determined with phenol reagent, which gives a blue color with tyrosine and tryptophan.
• One Anson Unit is defined as the amount of enzyme which under standard conditions (i.e., 25° C., pH 5.5 and 10 minute reaction time) digests hemoglobin at an initial rate such that there is liberated per minute an amount of TCA soluble product which gives the same color with phenol reagent as one milliequivalent of tyrosine.
• One MANU may be defined as the amount of enzyme required to release one micromole of maltose per minute at a concentration of 10 mg of maltotriose (Sigma M 8378) substrate per ml of 0.1 M citrate buffer, pH 5.0 at 37° C. for 30 minutes.
• CELLICTM CTec Trichoderma reesei cellulase composition supplemented with GH61 polypeptide and beta-glucosidase fusion protein (Novozymes A/S, Denmark).
• CELLICTM HTec xylanase (Novozymes A/S, Denmark).
• CELLICTM CTec2 a blend of (a) a Trichoderma reesei cellulase composition supplemented with GH61 polypeptide and beta-glucosidase and (b) CELLICTM HTec2 (Novozymes A/S, Denmark). CELLICTM HTec2—xylanase (Novozymes A/S, Denmark).
• Glucoamylase A (AMG A): Glucoamylase derived from Trametes cingulata disclosed in SEQ ID NO: 2 in WO 2006/069289 (Novozymes A/S).
• Alpha-Amylase A (AAA): a hybrid alpha-amylase consisting of Rhizomucor pusillus alpha-amylase with Aspergillus niger glucoamylase linker and SBD disclosed as V039 in Table 5 in WO 2006/069290 (Novozymes A/S).
• Celluclast 1.5 L a Trichoderma reesei cellulase composition with xylanase activity.
• Ultraflo Humicola insolens beta-glucanase with ferulic acid esterase and xylanase activity.
• Shearzyme 2 ⁇ Alignillus aculeatus xylanase.
• Shearzyme Plus Aspergillus aculeatus xylanase.
• Unfermented corn mash was used to prepare fermentation samples. Urea and penicillin were added to a final concentration of 1000 ppm and 3 mg/L respectively. The pH of the mash was adjusted to pH 5. Approximately 620 g mash was placed into LR-2.5T 1 L reactor vessels (IKA, Wilmington, N.C.) which were held in a 32° C. water bath with constant mixing throughout the 54 hour fermentation.
• oil recovered was reported as a mass percent of the initial mash used in the treatment.
• the recorded initial mash weight was used for the calculation.
• the oil yield was calculated based on a percent weight basis of oil obtained to starting corn mash used (Table 1).
• Unfermented industrially produced mash was blended in a blender for 5 minutes. This served to increase available surface area for enzymatic activity and possibly to further disrupt the oil-containing germ.
• a 100 g sample of this corn mash was aliquoted into plastic 250 mL Erlenmeyer® flasks with filter-equipped caps. Saccharification was performed using AAA+ AMG A (10.5 AGU/FAU-F) at a dose of 0.04 wt. %.
• CELLICTM CTec2 was dosed at 12 mg product/g DS.
• Rehydrated RED STARTM yeast (Fermentis/Lesaffre, USA) was used in the fermentation, 3.3 g of yeast suspended in 50 mL of 32° C. tap water for 30 minutes before pitching 2 mL of this culture into each mash. SSF was allowed to proceed for 72 hours in a reciprocal/orbital shaking air incubator at 32° C. After 72 hours, the fermentations were stopped by adding 10 microliters of 40% (v/v) H 2 SO 4 /g mash.
• a hexanes-based extractive assay was developed.
• the fermented samples were decanted into two 50 mL conical centrifuge tubes.
• the wall of the fermentation flask was rinsed well with deionized water and decanted into a third 50 ml centrifuge tube. All tubes were centrifuged in an Allegra 6R benchtop centrifuge with rotor GH-3.8 (Beckmen Coulter, Brea, Calif.) at 1462 ⁇ g for 10 minutes.
• the supernatant was decanted into a fresh 250 mL volumetric flask.
• hexane 15 ml of hexane were added to the funnel and mixed thoroughly with venting, and then allowed to separate in order to decant the aqueous layer into a beaker.
• the hexane layer was transferred into a suitable vessel.
• the aqueous layer was added back to the funnel and washed with hexane and collected a second time.
• a third wash was performed in the funnel with hexane leaving the aqueous layer out and only washing the walls of the funnel. All of the hexane layers were poured back into the funnel for a fourth time and rinsed with 100 ml of hot tap water.
• the aqueous phase was decanted and the hexane layer was transferred into a preweighed round bottom flask.
• the organic layer was distilled off under vacuum at 240 rpm with a water bath set to 85° C. using an R-205 rotary evaporator (Buchi, Flawil, Switzerland) and the round bottom flask was re-weighed to obtain the final oil weight.
• oil recovered was reported as a mass percent of the initial mash used in the treatment.
• the recorded initial mash weight was used for the calculation.
• the oil yield was calculated based on a percent weight basis of oil obtained to starting corn mash used (Table 2).
• the dry solids content of the mash was measured on a halogen lamp moisture balance model HB43-S (Mettler-Toledo, Toledo, Ohio) with a resulting value of approximately 30% DS. Approximately 25 g of the industrial mash were added to 50 ml conical centrifuge tubes with screw caps. A total of 24 fermentations were run.
• Spirizyme Ultra was dosed at a final concentration of 0.056% (% w/w of corn).
• Celluclast 1.5 L, Shearzyme 2 ⁇ , CELLICTM Ctec2, CELLICTM Htec2, and Shearzyme Plus were each dosed as 10 or 100 micrograms enzyme protein/g DS.
• g ⁇ ⁇ ethanol / g ⁇ ⁇ DS g ⁇ ⁇ CO 2 ⁇ ⁇ weight ⁇ ⁇ loss ⁇ 1 ⁇ ⁇ mol ⁇ ⁇ CO 2 44.0098 ⁇ ⁇ g ⁇ ⁇ CO 2 ⁇ 46.094 ⁇ ⁇ g ⁇ ⁇ ethanol 1 ⁇ ⁇ mol ⁇ ⁇ ethanol ⁇ 1 ⁇ ⁇ mol ⁇ ⁇ ethanol 1 ⁇ ⁇ mol ⁇ CO 2 ⁇ g ⁇ ⁇ mash ⁇ ⁇ in ⁇ ⁇ tube ⁇ % ⁇ ⁇ DS
• % ⁇ ⁇ DS g ⁇ ⁇ drysample g ⁇ ⁇ wet ⁇ ⁇ sample * 100 ⁇ %
• Hexane was added to each whole stillage sample at a dose of 0.125 mL hexane/g starting material. Each tube was sealed to prevent sample leakage, and mixed thoroughly. Tubes were centrifuged at 3,000 ⁇ g for 10 minutes in an Avanti JE Series centrifuge with a JS-5.3 rotor. After centrifugation, the oil/hexane layer (supernatant) was removed using a positive displacement pipette, transferred to a pre-weighed 5 ml flip-top tube, and reweighed. The density of the sample was measured using a research analytical density meter model DDM 2911 (Rudolph Research Analytical, Hackettstown, N.J.). The density of the supernatant was then inserted into the standard curve equation to find the percent oil in the supernatant. From this value the total percent oil in the starting material was derived.
• Enz . ⁇ dose ⁇ ⁇ ( ml ) Final ⁇ ⁇ enz . ⁇ dose ⁇ ⁇ ( mg ⁇ ⁇ EP / g ⁇ ⁇ DS ) ⁇ Mash ⁇ ⁇ weight ⁇ ⁇ ( g ) ⁇ Solid ⁇ ⁇ content ⁇ ⁇ ( % ⁇ ⁇ DS ) Conc . ⁇ enzyme ⁇ ⁇ ( mg ⁇ ⁇ EP / ml )
• Enzyme Dose Units 1 Spirizyme Ultra (Control) 0.500 AGU/g DS 2 CELLIC TM CTEC2 100.000 micrograms EP/g DS 3 CELLIC TM CTEC2 1000.000 micrograms EP/g DS 4 Celluclast 1.5 L 100.000 micrograms EP/g DS 5 Shearzyme Plus 10.000 micrograms EP/g DS 6 Shearzyme Plus 100.000 micrograms EP/g DS
• g ⁇ ⁇ ethanol / g ⁇ ⁇ DS g ⁇ ⁇ CO 2 ⁇ ⁇ weight ⁇ ⁇ loss ⁇ 1 ⁇ ⁇ mol ⁇ ⁇ CO 2 44.0098 ⁇ ⁇ g ⁇ ⁇ CO 2 ⁇ 1 ⁇ ⁇ mol ⁇ ⁇ ethanol 1 ⁇ ⁇ mol ⁇ ⁇ CO 2 ⁇ 46.094 ⁇ ⁇ g ⁇ ⁇ ethanol 1 ⁇ ⁇ mol ⁇ ⁇ ethanol g ⁇ ⁇ mash ⁇ ⁇ in ⁇ ⁇ tube ⁇ % ⁇ ⁇ DS
• the method quantifies several analytes using calibration standards for dextrins (DP4+), maltotriose, maltose, glucose, fructose, acetic acid, lactic acid, glycerol and ethanol.
• a 4 point calibration including the origin is used.
• a portion of corn was milled dry using a Fitzpatrick Hammer mill with a screen no. 7.
• the dry matter content of the milled product was measured gravimetrically to 88.0% w/w.
• a mash containing 30% dry matter was made using 681.8 g of milled corn and 1318.2 g of city water.
• 0.11 g of Termamyl SC-L (alpha-amylase) was added in a dosage that was equivalent to 20 KNU/kg milled corn.
• the mash was heated from 55° C. to 90° C. during 60 minutes under stirring and then cooled to 32° C. and divided in 240 g portions for the simultaneous saccharification and fermentation trials that were carried in 500 ml blue cap flask with an air lock placed in the rubber stopper.
• Enzyme products and dosages Enzyme classes (% of corn dry matter) Glucoamylase Spirizyme Plus 0.1% Glucoamylase + cellulase complex with Spirizyme Plus 0.1% + xylanase activity (family GH3) Celluclast 1.5 L 1% Glucoamylase + cellulase complex with Spirizyme Plus 0.1% + xylanase activity (family GH3) + ferulic acid Celluclast 1.5 L esterase and beta-glucanase with xylanase 0.5% + Ultraflo L 0.5% activity (family GH3) Glucoamylase + ferulic acid esterase and Spirizyme Plus 0.1% + beta-glucanase with xylanase activity Ultraflo L 1% (family GH3)
• the oil from the supernatant was diluted in hexane and filtrated.
• the hexane was evaporated in a fume cupboard and the oil was weighed.
• Table 14 shows the actual oil recovery data and average yields of oil to the supernatant (stillage) is calculated as well as the extra yields obtained according to the invention.
• the yield calculation was based on an oil content of 10.50% w/w found in the milled corn product.
• a fine milling is recommended, either dry or wet at a suitable step in the process to further improve the yields.
• a process of recovering oil comprising
• a process of recovering oil comprising
• a process of recovering oil comprising
• a process of recovering oil comprising
• a process of recovering oil comprising
• a process of recovering oil comprising
• a process of recovering oil comprising
• a process of dewatering a whole stillage comprising
• a method for dewatering a whole stillage comprising:
• a process of dewatering a whole stillage comprising
• a method for dewatering a whole stillage comprising:
• a process of dewatering a whole stillage comprising
• a method for dewatering a whole stillage comprising:
• a process of dewatering a whole stillage comprising
• a method for dewatering a whole stillage comprising:
• a process of producing a feed co-product comprising
• a process of producing a feed co-product comprising
• a process of producing a feed co-product comprising
• a process of producing a feed co-product comprising
• a process of producing a feed co-product comprising
• a process of producing a feed co-product comprising
• a process of producing a feed co-product comprising
• a process of producing a feed co-product comprising
• any of paragraphs 1-6, 9-14, 17-22, and 25-28 wherein the hemicellulase(s) is selected from the group consisting of acetylxylan esterase, arabinofuranosidase, feruloyl esterase, glucuronidase, xylanase, and xylosidase.
• the hemicellulase(s) is a xylanase.
• the fermentation medium further comprises a cellobiohydrolase(s).
• the fermentation medium further comprises a beta-glucosidase(s). 33.
• the fermentation medium further comprises a protease(s). 34.
• the fermentation medium further comprises a GH61 polypeptide(s). 35.
• the fermentation medium further comprises a beta-glucanase(s). 36.
• the fermentation medium further comprises a ferulic acid esterase(s). 37.
• the enzyme composition comprises one or more enzymes selected from the group consisting of a cellulase, a GH61 polypeptide having cellulolytic enhancing activity, a hemicellulase, an expansin, an esterase, a laccase, a ligninolytic enzyme, a pectinase, a peroxidase, a protease, and a swollenin.
• the enzyme composition comprises an endoglucanase, a cellobiohydrolase, and a beta-glucosidase.
• the enzyme composition comprises one or more enzymes selected from the group consisting of acetyxylan esterase, arabinofuranosidase, feruloyl esterase, glucuronidase, xylanase, and xylosidase.
• the endoglucanase(s) is added in an amount of 0.01-1.0 EGU/g, e.g. 0.02-0.08, 0.025-0.06, 0.025-0.05, or 0.03-0.04 EGU/g dry solids. 42.
• the fermentation medium further comprises a hemicellulase(s) selected from the group consisting of acetyxylan esterase, arabinofuranosidase, feruloyl esterase, glucuronidase, xylanase, and xylosidase. 47. The process of paragraph 46, wherein the hemicellulase(s) is a xylanase. 48. The process of any of paragraphs 45-47, wherein the fermentation medium further comprises an endoglucanase. 49. The process of any of paragraphs 45-48, wherein the fermentation medium further comprises one or more cellobiohydrolases and/or beta-glucosidases. 50. The process of any of paragraphs 45-49, wherein the fermentation medium further comprises one or more proteases. 51. A process for recovering oil, comprising:
• the cellulosic material is pretreated.
• the enzyme composition comprises one or more enzymes selected from the group consisting of a cellulase, a GH61 polypeptide having cellulolytic enhancing activity, a hemicellulase, an expansin, an esterase, a laccase, a ligninolytic enzyme, a pectinase, a peroxidase, a protease, and a swollenin. 54.
• the cellulase is one or more enzymes selected from the group consisting of an endoglucanase, a cellobiohydrolase, and a beta-glucosidase.
• the hemicellulase is one or more enzymes selected from the group consisting of acetyxylan esterase, arabinofuranosidase, feruloyl esterase, glucuronidase, xylanase, and xylosidase.
• steps (a) and (b) are performed simultaneously in a simultaneous saccharification and fermentation.
• the cellulosic material is pretreated.
• the enzyme composition comprises one or more enzymes selected from the group consisting of a cellulase, a GH61 polypeptide having cellulolytic enhancing activity, a hemicellulase, an expansin, an esterase, a laccase, a ligninolytic enzyme, a pectinase, a peroxidase, a protease, and a swollenin. 66.
• cellulase is one or more enzymes selected from the group consisting of an endoglucanase, a cellobiohydrolase, and a beta-glucosidase.
• the hemicellulase is one or more enzymes selected from the group consisting of acetyxylan esterase, arabinofuranosidase, feruloyl esterase, glucuronidase, xylanase, and xylosidase. 68.
• the fermentation medium further comprises a cellulase(s) (cellobiohydrolase, endoglucanase, and/or beta-glucosidase) and a hemicellulase(s) (e.g., ferulic acid esterase and/or xylanase).
• a cellulase(s) cellobiohydrolase, endoglucanase, and/or beta-glucosidase
• a hemicellulase(s) e.g., ferulic acid esterase and/or xylanase.
• the feed co-product of paragraph 73 which is distillers' dry grains with solubles (DDGS).
• 76 The feed co-product of paragraph 73, which is distillers' dry soluble (DDS).
• 77 The feed co-product of paragraph 73, which is distillers' wet grains (DWG).
• 78 An animal feed comprising a feed co-product of any of paragraphs 73-77.

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