US20150337345A1 - Methods of oil production in microorganisms - Google Patents
Methods of oil production in microorganisms Download PDFInfo
- Publication number
- US20150337345A1 US20150337345A1 US14/719,183 US201514719183A US2015337345A1 US 20150337345 A1 US20150337345 A1 US 20150337345A1 US 201514719183 A US201514719183 A US 201514719183A US 2015337345 A1 US2015337345 A1 US 2015337345A1
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- United States
- Prior art keywords
- medium
- concentration
- carbon sources
- microorganisms
- carbon
- Prior art date
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- Abandoned
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Images
Classifications
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- 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
- C12P7/64—Fats; Fatty oils; Ester-type waxes; Higher fatty acids, i.e. having at least seven carbon atoms in an unbroken chain bound to a carboxyl group; Oxidised oils or fats
- C12P7/6409—Fatty acids
- C12P7/6427—Polyunsaturated fatty acids [PUFA], i.e. having two or more double bonds in their backbone
- C12P7/6434—Docosahexenoic acids [DHA]
-
- 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
- C12P7/64—Fats; Fatty oils; Ester-type waxes; Higher fatty acids, i.e. having at least seven carbon atoms in an unbroken chain bound to a carboxyl group; Oxidised oils or fats
- C12P7/6409—Fatty acids
- C12P7/6427—Polyunsaturated fatty acids [PUFA], i.e. having two or more double bonds in their backbone
-
- 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
- C12P7/64—Fats; Fatty oils; Ester-type waxes; Higher fatty acids, i.e. having at least seven carbon atoms in an unbroken chain bound to a carboxyl group; Oxidised oils or fats
- C12P7/6436—Fatty acid esters
- C12P7/6445—Glycerides
- C12P7/6463—Glycerides obtained from glyceride producing microorganisms, e.g. single cell oil
-
- 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
- C12P7/64—Fats; Fatty oils; Ester-type waxes; Higher fatty acids, i.e. having at least seven carbon atoms in an unbroken chain bound to a carboxyl group; Oxidised oils or fats
- C12P7/6436—Fatty acid esters
- C12P7/6445—Glycerides
- C12P7/6472—Glycerides containing polyunsaturated fatty acid [PUFA] residues, i.e. having two or more double bonds in their backbone
Definitions
- fed-batch fermentation in which the main substrates (mainly the carbon sources) are added in increments to maintain a continuous supply while avoiding high concentrations of the substrates in the fermentation medium.
- fed-batch fermentation usually requires careful planning of the substrate feeding regime and intensive real-time fermentation monitoring and control, which demands extensive man power and may lead to a high failure rate of the fermentation operation.
- Another significant cost related to fermentation on an industrial scale includes procedures related to sterilization. These costs include expensive pressure vessel fermenters and steam-in-place systems as well as the associated operating costs for generating the steam.
- the methods include the steps of providing a microorganism capable of producing polyunsaturated fatty acids, providing a medium comprising a high concentration of one or more carbon sources, low pH, or both, and culturing the microorganism in the medium under sufficient conditions to produce the one or more polyunsaturated fatty acids.
- the methods include culturing the microorganisms (i) in the presence of a high concentration of one or more carbon sources, (ii) under conditions of low pH, or (iii) a combination thereof, wherein the culturing reduces contamination of the non-sterile culture comprising the microorganisms.
- the methods include culturing the microorganisms in a medium comprising a first amount of one or more carbon sources at a first concentration level, monitoring a carbon source concentration until the carbon source concentration is reduced below the first concentration level, and adding to the medium a second amount of one or more carbon sources to increase the carbon source concentration to a second concentration level.
- FIG. 1 is a graph showing the time profile of ONC-T18 cell concentration (biomass (“X”)) and total fatty acid content (TFA %) during a 2 liter (L) fermentation.
- FIG. 2 is a graph showing the time profile of ONC-T18 cell concentration (biomass (“X”)) and total fatty acid content (TFA %) during a 5 L fermentation.
- FIG. 3 is a graph showing the time profile of ONC-T18 cell concentration (biomass (“X”)) and total fatty acid content (TFA %) during a 30 L fermentation.
- FIG. 4 is a graph showing the time profile of ONC-T18 and ATCC20888 cell concentration during parallel high glucose fermentations using the same fermentation medium formula (ONC formula).
- FIG. 5 is a graph showing the time profile of ONC-T18 and ATCC20888 cell concentration during parallel high glucose fermentations using the ONC fermentation medium formula for ONC-T18 and a different fermentation medium formula for ATCC20888.
- FIG. 6 is a graph showing the time profile of ONC-T18 cell concentration (biomass (“X”)) and glucose concentration during a 30 L high glucose multi-batch fermentation.
- FIG. 6 and FIG. 3 show data from the same 30 L fermentation.
- FIG. 7 is a graph showing the effect of pH on the growth of ONC-T18 under high glucose multi-batch fermentation conditions.
- FIG. 8 is a graph showing the fatty acid profiles of ONC-T18 grown under different pH conditions and using high glucose multi-batch fermentation.
- FIG. 9 is a graph showing reduced contamination of an ONC-T18 culture under low pH conditions.
- the methods include providing a microorganism capable of producing polyunsaturated fatty acids, providing a medium comprising a high concentration of one or more carbon sources, low pH, or both, and culturing the microorganism in the medium under sufficient conditions to produce the one or more polyunsaturated fatty acids.
- the medium has a low pH.
- the medium has a high concentration of one or more carbon sources.
- the medium has a low pH and a high concentration of one or more carbon sources.
- the method includes culturing the microorganisms (i) in the presence of a high concentration of one or more carbon sources, (ii) under conditions of low pH, or (iii) a combination thereof, wherein the culturing reduces contamination of the non-sterile culture comprising the microorganisms.
- the method comprises culturing the microorganisms in an open vessel.
- the culturing comprises culturing the microorganisms in the presence of a high concentration of one or more carbon sources.
- the culturing comprises culturing the microorganisms under conditions of low pH.
- the culturing comprises culturing the microorganisms in the presence of a high concentration of one or more carbon sources and under conditions of low pH.
- low pH or “reduced pH” refers to a pH value lower than neutral pH.
- the term “low pH” generally refers to a pH value lower than 4.5.
- low pH refers to a value of 2 to 4.5, inclusive, or any value between 2 and 4.5.
- the pH is 3 to 3.5. It is understood that the pH of a culture may change over time, i.e., over the course of the fermentation process.
- culturing the microorganism under conditions of low pH means that the pH of the culture or medium is monitored and adjusted over time to maintain the pH of the culture at low pH.
- the phrase “high concentration of a carbon source” refers to an amount of the carbon source of at least 200 g/L.
- the concentration of the one or more carbon sources can be at least 200 g/L or greater than 200 g/L.
- the concentration of the one or more carbon sources is 200 to 300 g/L.
- the concentration of the one or more carbon sources is 200 to 250 g/L. It is understood that the concentration of a carbon source may change over time, i.e., over the course of the fermentation process.
- a medium containing a high concentration of a carbon source means that the medium contains at least 200 g/L of the carbon source.
- culturing the microorganism in a high concentration of a carbon source means that the initial concentration of the carbon source in the culture or medium is at least 200 g/L.
- the carbon source concentration can be monitored over time one or more times and once it reaches a certain threshold an additional amount of a carbon source can be added to the culture or medium.
- the additional amount of the carbon source is a high concentration of a carbon source, i.e., at least 200 g/L of the carbon source.
- the methods include culturing the microorganisms in a medium comprising a first amount of one or more carbon sources at a first concentration level, monitoring a carbon source concentration until the carbon source concentration is reduced below the first concentration level, and adding to the medium a second amount of one or more carbon sources to increase the carbon source concentration to a second concentration level.
- the first and/or second concentration levels of the one or more carbon sources are greater than 200 g/L.
- the second amount of the one or more carbon sources is added to the medium when the carbon source concentration level is reduced to 0 to 20 g/L.
- the provided methods can include repeated rounds of monitoring and additions of carbon sources as desired.
- the provided methods can include, after addition of the second amount of the one or more carbon sources, (a) culturing the microorganisms until the carbon source concentration of the one or more carbon sources is reduced below the second concentration level and (b) adding to the medium a third amount of one or more carbon sources to increase the carbon source concentration to a third concentration level.
- the third concentration level of the one or more carbon sources is greater than 200 g/L.
- the third amount of the one or more carbon sources is added to the medium when the carbon source concentration is reduced to 0 to 20 g/L.
- the methods include, after addition of the third amount of the one or more carbon sources, (a) culturing the microorganisms until the carbon source concentration of the one or more carbon sources is reduced below the third concentration level and (b) adding to the medium a fourth amount of one or more carbon sources to increase the carbon source concentration to a fourth concentration level.
- the fourth concentration level of the one or more carbon sources is greater than 200 g/L.
- the fourth amount of the one or more carbon sources is added to the medium when the carbon source concentration is reduced to 0 to 20 g/L.
- the one or more carbon sources in the first, second, third, and fourth amounts are the same.
- the carbon source concentration can be monitored one or more times.
- the carbon source concentration can be monitored continuously (e.g., using a device that continuously monitors carbon source (e.g., glucose) concentrations in a medium) or periodically (e.g., by removing a sample of medium and testing carbon source concentration in the sample).
- the carbon source concentration is monitored or determined before and/or after addition of an amount of the one or more carbon sources.
- the provided methods can include monitoring the carbon source concentration one or more times between additions of the amounts of the one or more carbon sources.
- the provided methods include monitoring or determining the carbon source concentration before addition of an amount of one or more carbon sources, after addition of an amount of one or more carbon sources and one or more times prior to addition of a further amount of one or more carbon sources.
- the provided methods can include monitoring the carbon source concentration after addition of a first amount of the one or more carbon sources and, optionally, one or more times prior to addition of a second amount of the one or more carbon sources.
- the provided methods can include monitoring the carbon source concentration after addition of the second amount of the one or more carbon sources and, optionally, one or more times prior to addition of a third amount of the one or more carbon sources.
- the provided methods can include monitoring the carbon source concentration after addition of the third amount of the one or more carbon sources and, optionally, one or more times prior to addition of a fourth amount of the one or more carbon sources.
- the carbon source concentration is monitored once between each addition of the amounts of the one or more carbon sources.
- the carbon source concentration is monitored after addition of the first amount of the one or more carbon sources and prior to addition of the second amount of the one or more carbon sources one time.
- the carbon source concentration can be monitored after addition of the second amount of the one or more carbon sources and prior to addition of the third amount of the one or more carbon sources one time.
- the carbon source concentration is monitored one time prior to addition of the second amount of the one or more carbon sources regardless of the number of further additions of amounts of the one or more carbon sources.
- Carbon source concentration or levels can be monitored directly or indirectly by any means known to those of skill in the art.
- the carbon source concentration is monitored by measuring dissolved oxygen levels, e.g., in the medium or in a sample from the medium.
- the monitoring includes obtaining a sample of the medium and determining the carbon source concentration in the sample.
- the step of determining the carbon source concentration comprises a colorimetric, enzyme-based, or fluorescence assay.
- the step of determining carbon source concentration includes high pressure liquid chromatograph (HPLC).
- the methods described herein include extracting lipids from a population of microorganisms.
- the population of microorganisms described herein can be algae (e.g., microalgae), fungi (including yeast), bacteria, or protists.
- the microorganism includes Thraustochytrids of the order Thraustochytriales, more specifically Thraustochytriales of the genus Thraustochytrium .
- the population of microorganisms includes Thraustochytriales as described in U.S. Pat. Nos. 5,340,594 and 5,340,742, which are incorporated herein by reference in their entireties.
- the microorganism can be a Thraustochytrium species, such as the Thraustochytrium species deposited as ATCC Accession No. PTA-6245 (i.e., ONC-T18) as described in U.S. Pat. No. 8,163,515, which is incorporated by reference herein in its entirety.
- the microorganism can have an 18s rRNA sequence that is at least 95%, 96%, 97%, 98%, 99%, 99.1%, 99.2%, 99.3%, 99.4%, 99.5%, 99.6%, 99.7%, 99.8%, 99.9% or more (e.g., including 100%) identical to SEQ ID NO:1.
- lipid includes phospholipids, free fatty acids, esters of fatty acids, triacylglycerols, sterols and sterol esters, carotenoids, xanthophyll (e.g., oxycarotenoids), hydrocarbons, and other lipids known to one of ordinary skill in the art.
- the lipid compounds include unsaturated lipids.
- the unsaturated lipids can include polyunsaturated lipids (i.e., lipids containing at least 2 unsaturated carbon-carbon bonds, e.g., double bonds) or highly unsaturated lipids (i.e., lipids containing 4 or more unsaturated carbon-carbon bonds).
- unsaturated lipids include omega-3 and/or omega-6 polyunsaturated fatty acids, such as docosahexaenoic acid (i.e., DHA), eicosapentaenoic acid (i.e., EPA), and other naturally occurring unsaturated, polyunsaturated and highly unsaturated compounds.
- the provided methods include or can be used in conjunction with additional steps for culturing microorganisms according to methods known in the art.
- a Thraustochytrid e.g., a Thraustochytrium sp.
- a Thraustochytrid can be cultivated according to methods described in U.S. Patent Publication US 2009/0117194 or US 2012/0244584, which are herein incorporated by reference in their entireties.
- Microorganisms are grown in a growth medium (also known as “culture medium”). Any of a variety of medium can be suitable for use in culturing the microorganisms described herein.
- the medium supplies various nutritional components, including a carbon source and a nitrogen source, for the microorganism.
- Medium for Thraustochytrid culture can include any of a variety of carbon sources.
- carbon sources include fatty acids, lipids, glycerols, triglycerols, carbohydrates, polyols, amino sugars, and any kind of biomass or waste stream.
- Fatty acids include, for example, oleic acid.
- Carbohydrates include, but are not limited to, glucose, celluloses, hemicelluloses, fructose, dextrose, xylose, lactulose, galactose, maltotriose, maltose, lactose, glycogen, gelatin, starch (corn or wheat), acetate, m-inositol (e.g., derived from corn steep liquor), galacturonic acid (e.g., derived from pectin), L-fucose (e.g., derived from galactose), gentiobiose, glucosamine, alpha-D-glucose-1-phosphate (e.g., derived from glucose), cellobiose, dextrin, alpha-cyclodextrin (e.g., derived from starch), and sucrose (e.g., from molasses).
- Polyols include, but are not limited to, maltitol, erythritol, and adonitol.
- Amino sugars include, but are not limited to, N-acetyl-D-galactosamine, N-acetyl-D-glucosamine, and N-acetyl-beta-D-mannosamine.
- the carbon source is glucose.
- the carbon source is provided at a high concentration, e.g., at least 200 g/L.
- the microorganisms provided herein are cultivated under conditions that increase biomass and/or production of a compound of interest (e.g., oil or total fatty acid (TFA) content).
- Thraustochytrids for example, are typically cultured in saline medium.
- Thraustochytrids can be cultured in medium having a salt concentration from about 2.0 g/L to about 50.0 g/L.
- Thraustochytrids are cultured in medium having a salt concentration from about 2 g/L to about 35 g/L (e.g., from about 18 g/L to about 35 g/L).
- the Thraustochytrids described herein can be grown in low salt conditions.
- the Thraustochytrids can be cultured in a medium having a salt concentration from about 5 g/L to about 20 g/L (e.g., from about 5 g/L to about 15 g/L).
- the culture medium optionally include NaCl.
- the medium include natural or artificial sea salt and/or artificial seawater.
- the culture medium can include non-chloride-containing sodium salts (e.g., sodium sulfate) as a source of sodium.
- non-chloride-containing sodium salts e.g., sodium sulfate
- a significant portion of the total sodium can be supplied by non-chloride salts such that less than about 100%, 75%, 50%, or 25% of the total sodium in culture medium is supplied by sodium chloride.
- the culture medium have chloride concentrations of less than about 3 g/L, 500 mg/L, 250 mg/L, or 120 mg/L.
- culture medium for use in the provided methods can have chloride concentrations of between and including about 60 mg/L and 120 mg/L.
- non-chloride sodium salts suitable for use in accordance with the present methods include, but are not limited to, soda ash (a mixture of sodium carbonate and sodium oxide), sodium carbonate, sodium bicarbonate, sodium sulfate, and mixtures thereof. See, e.g., U.S. Pat. Nos. 5,340,742 and 6,607,900, the entire contents of each of which are incorporated by reference herein.
- Medium for Thraustochytrids culture can include any of a variety of nitrogen sources.
- Exemplary nitrogen sources include ammonium solutions (e.g., NH 4 in H 2 O), ammonium or amine salts (e.g., (NH 4 ) 2 SO 4 , (NH 4 ) 3 PO 4 , NH 4 NO 3 , NH 4 OOCH 2 CH 3 (NH 4 Ac)), peptone, tryptone, yeast extract, malt extract, fish meal, sodium glutamate, soy extract, casamino acids and distiller grains. Concentrations of nitrogen sources in suitable medium typically range between and including about 1 g/L and about 25 g/L.
- the medium optionally include a phosphate, such as potassium phosphate or sodium-phosphate.
- a phosphate such as potassium phosphate or sodium-phosphate.
- Inorganic salts and trace nutrients in medium can include ammonium sulfate, sodium bicarbonate, sodium orthovanadate, potassium chromate, sodium molybdate, selenous acid, nickel sulfate, copper sulfate, zinc sulfate, cobalt chloride, iron chloride, manganese chloride calcium chloride, and EDTA.
- Vitamins such as pyridoxine hydrochloride, thiamine hydrochloride, calcium pantothenate, p-aminobenzoic acid, riboflavin, nicotinic acid, biotin, folic acid and vitamin B12 can be included.
- the pH of the medium can be adjusted to between and including 3.0 and 10.0 using acid or base, where appropriate, and/or using the nitrogen source.
- the medium is adjusted to a low pH as defined above.
- the medium can be sterilized.
- a medium used for culture of a microorganism is a liquid medium.
- the medium used for culture of a microorganism can be a solid medium.
- a solid medium can contain one or more components (e.g., agar or agarose) that provide structural support and/or allow the medium to be in solid form.
- Cells can be cultivated for anywhere from 1 day to 60 days.
- cultivation is carried out for 14 days or less, 13 days or less, 12 days or less, 11 days or less, 10 days or less, 9 days or less, 8 days or less, 7 days or less, 6 days or less, 5 days or less, 4 days or less, 3 days or less, 2 days or less, or 1 day or less.
- Cultivation is optionally carried out at temperatures from about 4° C. to about 30° C., e.g., from about 18° C. to about 28° C.
- Cultivation can include aeration-shaking culture, shaking culture, stationary culture, batch culture, semi-continuous culture, continuous culture, rolling batch culture, wave culture, or the like. Cultivation can be performed using a conventional agitation-fermenter, a bubble column fermenter (batch or continuous cultures), a wave fermenter, etc.
- Cultures can be aerated by one or more of a variety of methods, including shaking.
- shaking ranges from about 100 rpm to about 1000 rpm, e.g., from about 350 rpm to about 600 rpm or from about 100 to about 450 rpm.
- the cultures are aerated using different shaking speeds during biomass-producing phases and during lipid-producing phases.
- shaking speeds can vary depending on the type of culture vessel (e.g., shape or size of flask).
- the level of dissolved oxygen is higher during the biomass production phase than it is during the lipid production phase.
- DO levels are reduced during the lipid production phase (i.e., the DO levels are less than the amount of dissolved oxygen in biomass production phase).
- the level of dissolved oxygen is reduced below saturation.
- the level of dissolved oxygen can be reduced to a very low, or even undetectable, level.
- the production of desirable lipids can be enhanced by culturing cells according to methods that involve a shift of one or more culture conditions in order to obtain higher quantities of desirable compounds.
- cells are cultured first under conditions that maximize biomass, followed by a shift of one or more culture conditions to conditions that favor lipid productivity.
- Conditions that are shifted can include oxygen concentration, C:N ratio, temperature, and combinations thereof.
- a two-stage culture is performed in which a first stage favors biomass production (e.g., using conditions of high oxygen (e.g., generally or relative to the second stage), low C:N ratio, and ambient temperature), followed by a second stage that favors lipid production (e.g., in which oxygen is decreased, C:N ratio is increased, and temperature is decreased).
- the resulting biomass is pasteurized to inactivate undesirable substances present in the biomass.
- the biomass can be pasteurized to inactivate compound degrading substances.
- the biomass can be present in the fermentation medium or isolated from the fermentation medium for the pasteurization step.
- the pasteurization step can be performed by heating the biomass and/or fermentation medium to an elevated temperature.
- the biomass and/or fermentation medium can be heated to a temperature from about and including 50° C. to about and including 95° C. (e.g., from about and including 55° C. to about and including 90° C. or from about and including 65° C. to about and including 80° C.).
- the biomass and/or fermentation medium can be heated from about and including 30 minutes to about and including 120 minutes (e.g., from about and including 45 minutes to about and including 90 minutes, or from about and including 55 minutes to about and including 75 minutes).
- the pasteurization can be performed using a suitable heating means as known to those of skill in the art, such as by direct steam injection.
- a pasteurization step is not performed (i.e., the method lacks a pasteurization step.
- the biomass can be harvested according to methods known to those of skill in the art.
- the biomass can optionally be collected from the fermentation medium using various conventional methods, such as centrifugation (e.g., solid-ejecting centrifuges) or filtration (e.g., cross-flow filtration) and can also include the use of a precipitation agent for the accelerated collection of cellular biomass (e.g., sodium phosphate or calcium chloride).
- centrifugation e.g., solid-ejecting centrifuges
- filtration e.g., cross-flow filtration
- a precipitation agent for the accelerated collection of cellular biomass (e.g., sodium phosphate or calcium chloride).
- the biomass is washed with water.
- the biomass can be concentrated up to about and including 20% solids.
- the biomass can be concentrated to about and including 5% to about and including 20% solids, from about and including 7.5% to about and including 15% solids, or from about and including 15% solids to about and including 20% solids, or any percentage within the recited ranges.
- the biomass can be concentrated to about 20% solids or less, about 19% solids or less, about 18% solids or less, about 17% solids or less, about 16% solids or less, about 15% solids or less, about 14% solids or less, about 13% solids or less, about 12% solids or less, about 11% solids or less, about 10% solids or less, about 9% solids or less, about 8% solids or less, about 7% solids or less, about 6% solids or less, about 5% solids or less, about 4% solids or less, about 3% solids or less, about 2% solids or less, or about 1% solids or less.
- the provided methods optionally, include isolating the polyunsaturated fatty acids from the biomass or microorganisms using methods known to those of skill in the art. For example, methods of isolating polyunsaturated fatty acids are described in U.S. Pat. No. 8,163,515, which is incorporated by reference herein in its entirety.
- the medium is not sterilized prior to isolation of the polyunsaturated fatty acids.
- sterilization comprises an increase in temperature.
- the polyunsaturated fatty acids produced by the microorganisms and isolated from the provided methods are medium chain fatty acids.
- the one or more polyunsaturated fatty acids are selected from the group consisting of alpha linolenic acid, arachidonic acid, docosahexanenoic acid, docosapentaenoic acid, eicosapentaenoic acid, gamma-linolenic acid, linoleic acid, linolenic acid, and combinations thereof.
- Polyunsaturated fatty acids (PUFAs) and other lipids produced according to the method described herein can be utilized in any of a variety of applications, for example, exploiting their biological or nutritional properties.
- the compounds can be used in pharmaceuticals, food supplements, animal feed additives, cosmetics, and the like.
- the PUFAs and other lipids are used to produce fuel, e.g., biofuel.
- Lipids produced according to the methods described herein can also be used as intermediates in the production of other compounds.
- the lipids produced according to the methods described herein can be incorporated into a final product (e.g., a food or feed supplement, an infant formula, a pharmaceutical, a fuel, etc.)
- a final product e.g., a food or feed supplement, an infant formula, a pharmaceutical, a fuel, etc.
- suitable food or feed supplements for incorporating the lipids described herein into include beverages such as milk, water, sports drinks, energy drinks, teas, and juices; confections such as jellies and biscuits; fat-containing foods and beverages such as dairy products; processed food products such as soft rice (or porridge); infant formulae; breakfast cereals; or the like.
- one or more produced lipids can be incorporated into a dietary supplement, such as, for example, a multivitamin.
- a lipid produced according to the method described herein can be included in a dietary supplement and optionally can be directly incorporated into a component of food or feed (e.g., a food supplement).
- feedstuffs into which lipids produced by the methods described herein can be incorporated include pet foods such as cat foods; dog foods and the like; feeds for aquarium fish, cultured fish or crustaceans, etc.; feed for farm-raised animals (including livestock and fish or crustaceans raised in aquaculture).
- Food or feed material into which the lipids produced according to the methods described herein can be incorporated is preferably palatable to the organism which is the intended recipient. This food or feed material can have any physical properties currently known for a food material (e.g., solid, liquid, soft).
- one or more of the produced compounds can be incorporated into a pharmaceutical.
- examples of such pharmaceuticals include various types of tablets, capsules, drinkable agents, etc.
- the pharmaceutical is suitable for topical application.
- Dosage forms can include, for example, capsules, oils, granula, granula subtilae, pulveres, tabellae, pilulae, trochisci, or the like.
- lipids produced according to the methods described herein can be incorporated into products as described herein by combinations with any of a variety of agents.
- such compounds can be combined with one or more binders or fillers.
- products can include one or more chelating agents, pigments, salts, surfactants, moisturizers, viscosity modifiers, thickeners, emollients, fragrances, preservatives, etc., and combinations thereof.
- any subset or combination of these is also specifically contemplated and disclosed. This concept applies to all aspects of this disclosure including, but not limited to, steps in methods using the disclosed compositions. Thus, if there are a variety of additional steps that can be performed, it is understood that each of these additional steps can be performed with any specific method steps or combination of method steps of the disclosed methods, and that each such combination or subset of combinations is specifically contemplated and should be considered disclosed.
- High glucose fermentations of ONC-T18 were carried out at different fermentor scales with the same medium composition and glucose supply strategy.
- the fermentors used were 2 liter (L), 5 L, and 30 L with working volume of about 1.7 L, 4 L, and 25 L, respectively.
- Medium composition and glucose supply strategy are detailed in Table 1 below.
- FIGS. 1 to 3 are graphs showing the time profile of ONC-T18 cell concentration (biomass) and total fatty acid production (TFA %), using different scales of fermentors. Contrary to what has been reported on various microorganisms under high carbon concentrations, ONC-T18 was able to grow very fast under these harsh growth conditions and its biomass could increase up to 230 g/L during four to five days of fermentation. Final total fat content could reach 70% at all scales of fermentation tested, meeting or exceeding those reported in the literature for single cell oil fermentations.
- the major difference between traditional fed-batch fermentation and the newly developed fermentation process was the high glucose concentration at the start and also during the course of the fermentation.
- the new process starts with about 200 g/L glucose (as compared to 60 g/L glucose of previous processes) and sufficient amounts of other nutrients (e.g., nitrogen in the form of ammonium sulfate, phosphorus in the form of potassium phosphate).
- nutrients e.g., nitrogen in the form of ammonium sulfate, phosphorus in the form of potassium phosphate.
- Such cycles of glucose addition and batch operation is repeated until the oil production reaches the physiological limits of the culture, or the growth/production is limited by other fermentation conditions, such as dissolved oxygen supply, which is determined by the design factors of a particular fermentation system.
- Such a carbon supply strategy greatly simplifies the monitoring and control of algal oil fermentation process. This is evidenced by Table 2 showing the validation of this process at 2 L to 10 L. As shown in Table 2, with a 4 to 6 day cycle the biomass can reach 200 to 230 g/L with a total fatty acid content hitting about 70%.
- Another advantage of such high-glucose fermentation is the competitive edge presented by the high osmotic pressure, which few microorganisms are able to withstand resulting in less contamination.
- additional glucose other than the initial 200 g/L glucose, was added in a non-sterile form. No contamination was observed.
- a significant cost to industrial scale fermentation includes those associated with sterilization.
- the costs include the expense of pressure vessel fermenters and steam-in-place systems as well as operating costs associated with generating steam.
- One way in which to reduce these costs is to ferment cultures under non-sterile conditions.
- non-sterile conditions are problematic for most microorganisms due to culture contamination, e.g., by bacteria.
- a medium without yeast extract or soya peptone was prepared. Table 3 lists the medium components. pH was controlled throughout the fermentation to 4.5 using sodium hydroxide (5N). The temperature was not controlled and a glucose feed of 75% was used during fermentation.
- Air was supplied by a silicone tube with no sparger.
- the impeller was a Lightnin A310 style hydrofoil (axial flow).
- the open top vessel was a bottle with the top removed.
- the pH was controlled by the Sartorius PH control system on the Biostat B (Sartorius Corporation, Bohemia, N.Y.). There was no temperature control.
- the rate of fat accumulation over the duration of the fermentation was 0.5 g/L/h and the rate of DHA accumulation was 0.23 g/L/h. The results are shown in Table 4.
- the bacteria was counted using a hemocytometer, and its concentration calculated to the unit of cell count per ml of media.
- the bacteria population ceased to increase when the pH was dropped to 3.3.
- the culture of ONC-T18 contained to grow as shown in FIG. 9 .
- the results are shown in Table 6. It is noted that if this experiment were started at pH 3.3 instead of pH 6.5, no bacterial contamination would have been observed.
- FIGS. 7 and 8 Fermentations for FIGS. 7 and 8 were carried out using high-glucose multi-batch feeding strategy as described in Example 1.
- ONC-T18 and similar microorganisms can be fermented or grown under high stress conditions, e.g., high glucose (and thus high osmotic pressure) and/or low pH in order to reduce costs of oil production and reduce contamination.
- high stress conditions e.g., high glucose (and thus high osmotic pressure) and/or low pH in order to reduce costs of oil production and reduce contamination.
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CN106795539B (zh) | 2014-05-22 | 2021-06-22 | 玛拉可再生能源公司 | 在微生物中产生油的方法 |
US10851395B2 (en) | 2016-06-10 | 2020-12-01 | MARA Renewables Corporation | Method of making lipids with improved cold flow properties |
JP7495066B2 (ja) * | 2018-11-02 | 2024-06-04 | マラ リニューアブルズ コーポレーション | 栄養価が改善した藻類オイル |
CN112391292A (zh) * | 2020-11-23 | 2021-02-23 | 江南大学 | 一种中链脂肪酸碳链延长功能微生物及其富集方法和应用 |
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US20120244584A1 (en) * | 2011-03-07 | 2012-09-27 | Ocean Nutrition Canada Limited | Engineering microorganisms |
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US5340594A (en) | 1988-09-07 | 1994-08-23 | Omegatech Inc. | Food product having high concentrations of omega-3 highly unsaturated fatty acids |
US5340742A (en) | 1988-09-07 | 1994-08-23 | Omegatech Inc. | Process for growing thraustochytrium and schizochytrium using non-chloride salts to produce a microfloral biomass having omega-3-highly unsaturated fatty acids |
CZ301130B6 (cs) | 2000-01-28 | 2009-11-11 | Martek Biosciences Corporation | Zvýšená produkce lipidu obsahujících polyenové mastné kyseliny ve fermentorech kulturami mikrobu s vysokou hustotou ve fermentorech |
EP1359224A1 (fr) * | 2002-05-01 | 2003-11-05 | Ato B.V. | Procédé de production d'acides gras polyinsaturés par des microorganismes marins |
EP1660639A1 (fr) | 2003-09-01 | 2006-05-31 | Novozymes A/S | Procede d'augmentation du rendement de biomasse et/ou de constituants de biomasse a partir de micro-organismes marins |
KR101295390B1 (ko) | 2003-10-02 | 2013-09-17 | 마텍 바이오싸이언스스 코포레이션 | 변형량의 염소 및 칼륨을 사용하는 미세조류 중에 고농도 디에치에이의 생산 |
DE10352837A1 (de) * | 2003-11-10 | 2005-07-07 | Nutrinova Nutrition Specialties & Food Ingredients Gmbh | Prozess zur Kultivierung von Mikroorganismen der Gattung Thraustochytriales |
DE10352838A1 (de) * | 2003-11-10 | 2005-07-07 | Nutrinova Nutrition Specialties & Food Ingredients Gmbh | Verfahren zur Kultivierung von Mikroorganismen der Gattung Thraustochytriales unter Verwendung eines optimierten Niedrigsalzmediums |
CN101389749A (zh) * | 2005-06-07 | 2009-03-18 | 加拿大海洋营养食品有限公司 | 生产脂质和抗氧化剂的真核微生物 |
EP2447356B1 (fr) | 2005-06-07 | 2016-04-20 | DSM Nutritional Products AG | Micro-organismes eucaryotes pour produire des lipides et des antioxydants |
EP2194138A1 (fr) * | 2008-12-08 | 2010-06-09 | Marenutrica GmbH | Composés contenant de l'acide docosahexaénoïque et son procédé de production |
US20120202242A1 (en) | 2011-02-09 | 2012-08-09 | Hazlebeck David A | System and Method for Non-Sterile Heterotrophic Algae Growth |
EP2970926B1 (fr) * | 2013-03-13 | 2018-01-31 | DSM Nutritional Products AG | Modification génétique de micro-organismes |
CN106795539B (zh) | 2014-05-22 | 2021-06-22 | 玛拉可再生能源公司 | 在微生物中产生油的方法 |
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CA2953060C (fr) | 2022-09-20 |
EP3146060A2 (fr) | 2017-03-29 |
CN106795539A (zh) | 2017-05-31 |
BR112017002791B1 (pt) | 2024-03-05 |
KR102236782B1 (ko) | 2021-04-05 |
CA3159974C (fr) | 2024-06-11 |
IL249638A0 (en) | 2017-03-30 |
CA3159974A1 (fr) | 2015-11-26 |
WO2015177641A3 (fr) | 2016-01-21 |
PT3146060T (pt) | 2020-02-19 |
EP3146060A4 (fr) | 2017-12-20 |
EP3146060B1 (fr) | 2019-12-18 |
CN106795539B (zh) | 2021-06-22 |
CA2953060A1 (fr) | 2015-11-26 |
AU2015263044A1 (en) | 2017-01-12 |
ES2774452T3 (es) | 2020-07-21 |
KR20170020373A (ko) | 2017-02-22 |
DK3146060T3 (da) | 2020-02-10 |
BR112017002791A2 (pt) | 2023-02-07 |
AU2015263044B2 (en) | 2021-07-01 |
US20210363554A1 (en) | 2021-11-25 |
WO2015177641A2 (fr) | 2015-11-26 |
US11466297B2 (en) | 2022-10-11 |
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