EP1685241A2 - Procede pour cultiver des micro-organismes de l'ordre des i thraustochytriales /i dans un milieu faiblement salin optimise - Google Patents

Procede pour cultiver des micro-organismes de l'ordre des i thraustochytriales /i dans un milieu faiblement salin optimise

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Publication number
EP1685241A2
EP1685241A2 EP04818134A EP04818134A EP1685241A2 EP 1685241 A2 EP1685241 A2 EP 1685241A2 EP 04818134 A EP04818134 A EP 04818134A EP 04818134 A EP04818134 A EP 04818134A EP 1685241 A2 EP1685241 A2 EP 1685241A2
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Prior art keywords
medium
biomass
microorganisms
content
salt
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English (en)
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Matthias RÜSING
Markus Luy
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Lonza AG
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Nutrinova Nutrition Specialties and Food Ingredients GmbH
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Priority to EP20140002902 priority Critical patent/EP2816104A1/fr
Publication of EP1685241A2 publication Critical patent/EP1685241A2/fr
Withdrawn legal-status Critical Current

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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
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
    • C12N1/14—Fungi; Culture media therefor
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23K—FODDER
    • A23K10/00—Animal feeding-stuffs
    • A23K10/30—Animal feeding-stuffs from material of plant origin, e.g. roots, seeds or hay; from material of fungal origin, e.g. mushrooms
    • A23K10/37—Animal feeding-stuffs from material of plant origin, e.g. roots, seeds or hay; from material of fungal origin, e.g. mushrooms from waste material
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L33/00—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
    • A23L33/10—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
    • A23L33/115—Fatty acids or derivatives thereof; Fats or oils
    • A23L33/12—Fatty acids or derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
    • C12N1/12—Unicellular algae; Culture media therefor
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P7/00—Preparation of oxygen-containing organic compounds
    • C12P7/64—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
    • 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
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
    • A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs

Definitions

  • PUFAs polyunsaturated fatty acids
  • omega-3 fatty acids n3 fatty acids
  • Sources for the production of PUFAs and in particular n3 fatty acids are primarily marine cold water fish and oils derived from them, but also marine microorganisms, which have the advantage over fish that they can be used in fermenters to produce PUFAs under inexpensive and controlled conditions.
  • fermentative production there is no risk of contamination, as is often described for fish or fish oils obtained from them (Olsen SF. Int J Epidemiol. 2001: 1279-80).
  • the composition of the oils obtained can be positively influenced by the selection of the organism and the culture conditions and is not subject to seasonal fluctuations, as is also described for fish and fish products (Gamez-Meza et al. Lipids 1999: 639-42).
  • Microorganisms that are suitable for the production of n3-PUFA can be found, for example, in the bacteria under the Vibrio genus (e.g. Vibrio marinus) or under the Dinoflageliaten (Dinophyta), there in particular the genus Crypthecodinium, such as C. cohnii or among the stramenopiles, such as the Pinguiophyceae such as Glossomastix, Phaeomonas, Pinguiochrysis, Pingiüococcus and Polydochrysis.
  • Vibrio genus e.g. Vibrio marinus
  • Dinoflageliaten Dinoflageliaten
  • the genus Crypthecodinium such as C. cohnii or among the stramenopiles
  • Pinguiophyceae such as Glossomastix, Phaeomonas, Pinguiochrysis, Pingiüococcus and Polydochrysis.
  • Preferred microorganisms for the fermentative production of PUFA belong to the stramenopiles (or labyrinthulomycota), in particular to the order Thraustochytriales, (Thraustchytriideä) and there again in particular to the genera Japonochytrium, Schizochytrium, Thraustochytrium, Althornia, and Labyrintrochoidium.
  • WO 91/11918 AI discloses the production of PUFAs with Crypthecodinium cohnii
  • WO 96/33263 AI and the corresponding European patent application EP 0 823 475 AI describe the production of PUFAs with microorganisms of the genus Schizochytrium
  • patent application WO 98/03671 describes the production of PUFAs with microorganisms of the genus Ulkenia are disclosed.
  • the natural habitat of the described microorganisms and especially the labyrinthulomycota are marine habitats. Conventionally, these microorganisms are therefore cultivated in correspondingly saline media, the salinity of seawater for the purposes of the present invention being defined as 32-35 g / L and a proportion of 90-95% of sodium and chloride.
  • Typical media for the cultivation of marine microorganisms such as Thraustochytrium or Schizochytrium are based on sea water (e.g. ATCC (American Type ' Culture Collection) 790 By + Medium [yeast extract 1.0 g, peptone 1.0 g, D + glucose 5.0 g, sea water 1 L]).
  • struryopile or labyrinthulomycota
  • euryhaline microorganisms can produce larger amounts of PUFA in fermentation media containing a reduced content of sodium ions (60% of sea water)
  • U.S. Pat. No. 6,451,567 Also described is the use of low chloride culture media to reduce the corrosive effects of chloride on fermentation equipment (U.S. Pat. No. 6,410,281). This has been shown, for example, for microorganisms of the genera Thraustochytrium and Schizochytrium with fermentation media which contain chloride in a concentration of not more than 3 g / L (US Pat. No. 5,340,742, US Pat. No. 6,451,567, US Pat. No.
  • oils formed can in some cases have fatty acid spectra which do not necessarily correspond to the desired products, but which first have to be changed in terms of process technology. Due to the sometimes low content of product per biomass, processing is often considerably complicated, since relatively large amounts of the biomass have to be processed in order to obtain relatively small amounts of product. Furthermore, all the processes described so far have their own relatively high total salt contents in the culture media. This not only leads to massive problems in the processing of the products, but is also extremely disadvantageous from an environmental point of view, since not only large amounts of biomass are produced, but also very saline wastewater that has to be disposed of.
  • An advantageous method for the cultivation of Thraustochytriales is provided by the method defined in claim 1.
  • This method involves culturing microorganisms of the order Thraustochytriales in a low salt medium without the addition of sodium or chloride ions in solid or dissolved form, with a total salt content of less than 10% based on sea water, i.e. less than approx. 3.5 g / L total salts.
  • the invention further comprises a method for producing high-purity PUFAs.
  • Preferred PUFAs according to the invention are DHA, DPA and EPA.
  • the microorganisms cultured in the abovementioned process have a production of more than 10%, preferably more than 14%, and very particularly preferably more than 18% o DHA per dry biomass.
  • the microorganisms cultured in the abovementioned process show a production of more than 5%, preferably more than 7%, and very particularly preferably more than 10%> DPA per dry biomass.
  • the PUFAs By isolating the PUFAs from the microorganisms (biomass) and / or the culture medium following the cultivation, the PUFAs can be obtained in high yield and purity.
  • the present invention also includes a method for producing biomass, the biomass being made available by the cultivation method according to the invention.
  • This biomass can be used in all conceivable ways.
  • this biomass e.g. in the dried state (dry organic matter), used directly as food or as feed.
  • the invention also includes an oil which is obtained in that the invention. Cultivation process is carried out, and the oil is isolated from the microorganisms (biomass) and / or the culture medium.
  • the microorganisms show a production of more than 30% by weight of oil, preferably of more than 35% by weight of oil, per unit weight of dry organic matter under the conditions according to the invention.
  • oil is understood to mean a proportion of at least 70% neutral lipids and at least 2% phospholipids, which corresponds to the normal fatty acid spectrum of Thraustochytriales known to the person skilled in the art.
  • the neutral lipids consist of at least 80%> triglycerides and other compounds such as diacylglycerides, sterols etc.
  • the weight fraction of the triglycerides consists of approximately 95% fatty acids and 5% glycerin.
  • PUFAs are polyunsaturated long-chain fatty acids with a chain length> C12 with at least two double bonds.
  • PUFAs which can be produced by the process according to the invention are in particular n3 fatty acids and n6 fatty acids.
  • n3 fatty acids in the sense of the invention are understood to be polyunsaturated long-chain fatty acids with a chain length> C12 with at least two or more double bonds, the first of the double bonds between the carbon atoms C3 and C4 being constituted starting from the alkyl end , Accordingly, with n6 fatty acids, the first double bond is between the carbon atoms C6 and C7 starting from the alkyl end.
  • Microorganisms from the group of the labyrinthulomycota can be used for the production of the PUFAs by the process according to the invention.
  • Microorganisms of the order Thraustochytriales are preferred (Lewis, TE, Nichols, PD, McMeekin, TA, The Biotechnological Potential of Thraustochytrids, Marine Biotechnology, 1999, pp. 580-587 and Porter, D.
  • Microorganisms of the genera Japonochytrium, Labyrinthuloides, Aplanochytrium Althomia, Schizochytrium, Thraustochytrium and Ulkenia are particularly preferred. Of these, Schizochytrium, Thraustochytrium and 'Ulkenia are very particularly preferred. The following are particularly preferred: Japonochytrium sp. ATCC 28207, Thraustochytrium aureum (in particular ATCC 28211 or ATTC 34304), Thraustochytrium roseum ATCC 28210 Thraustochytrium sp.
  • ATCC 20890 ATTC 20891, ATTC 20892 and ATTC 26185, Schizochytrium aggregatum ATTC 28209, Schizochytrium sp. ATCC 20888 and ATTC 20889, Schizochytrium SR21, and Ulkenia spec. SAM 2179 and SAM 2180.
  • Microorganisms suitable for the process according to the invention are both wild-type forms and also mutants and strains derived therefrom and recombinant strains of the corresponding organisms.
  • the present invention particularly includes mutants or recombinant strains for increasing the production of PUFA.
  • microorganisms in the sense of the present invention are cultivated by inoculating a liquid or a solid medium with a preculture of these organisms.
  • Culture techniques suitable for microorganisms of the Thraustochytriales order are well known to those skilled in the art. Typically, but not exclusively, the culture is carried out by means of aqueous fermentation in an appropriate container. 'Examples for a typical vessel for such fermentation include shaker flasks or bioreactors, such as STRs (stirred tank reactors), or bubble columns. " The culture is typically carried out at temperatures between 10.degree. C. and 40.degree. C., preferably between 20.degree. C. and 35.degree. C., particularly preferably between 25.degree. C. and 30.degree. C., very particularly preferably between 27.degree. C. and 29.degree and especially at 28 ° C.
  • the low salt medium comprises less than 1.5 g / L total salts.
  • the total salt content of the low salt medium corresponds to a value ⁇ 15% of the salt content of Sea water, preferably ⁇ 12% and particularly preferably ⁇ 10%>.
  • a total salt content of ⁇ 8% of the salt content of sea water is very particularly preferred.
  • addition is understood to mean addition both in dissolved and in solid form.
  • the addition of sea water even in the smallest amounts, would be an addition of sodium or chloride salts according to the invention.
  • the addition of unusual media components to the 'medium of the invention must, if unusual .Medien entertainer corresponding sodium or chloride ions, to be understood as addition of these salts.
  • the usual (and mostly necessary, ie indispensable) media components are water (tap water), yeast extract, corn steep liquor and the like. ⁇ . Have a very low, unavoidable proportion of sodium and chloride. The addition of such customary media components is therefore not to be understood according to the invention as the addition of sodium or chloride salts.
  • yeast extract contains less than 2% by weight NaCl. Therefore, yeast extract is added to the medium in the usual way, i.e. between 10 and 20 g / L, the NaCl content increases by less than 0.2 g / L. According to the invention, this is not understood to be the addition of NaCl.
  • this medium is therefore free of sodium and / or chloride salt additives.
  • the total sodium content of the low salt medium is very particularly preferably below 2 g / L, preferably below 500 mg / L and very particularly preferably below 150 mg / L.
  • the total chloride content of the low salt medium is preferably below 2 g / L, preferably below 500 mg / L and very particularly preferably below 250 mg / L.
  • the sum of the proportions by weight of Na and Cl ions is particularly preferably less than 1.75 g / L.
  • the low salt medium further preferably comprises one or more carbon sources, as well as one or more nitrogen sources.
  • Substances which can be used as sources of carbon and nitrogen are well known to the person skilled in the art for the cultivation of microorganisms of the order Thraustochytriales.
  • Carbon sources that can be used are, for example, carbohydrates such as glucose, fructose, xylose, sucrose, maltose, soluble starch, fucose, glucosamine, dextran, glutamic acid, molasses, glycerin or mannitol or fats and oils or vegetable hydrolysates.
  • Usable natural nitrogen sources are, for example, peptone, yeast extract, malt extract, meat extract, casamino acids, corn steep liquor or soybeans
  • usable organic nitrogen sources are, for example, glutamate and urea
  • inorganic nitrogen sources such as, for example, ammonium acetate, ammonium hydrogen carbonate, ammonium sulfate or ammonium nitrate can be used as the nitrogen source.
  • the low salt medium can contain all further components which are beneficial to the person skilled in the art for the cultivation of microorganisms of the order Thraustochytriales, in particular inorganic salts of, for example, Ca, Mg, K, Fe, Ni, Co, Cu, Mn, Mo or Zn.
  • inorganic salts of, for example, Ca, Mg, K, Fe, Ni, Co, Cu, Mn, Mo or Zn.
  • examples include phosphates such as potassium dihydrogen phosphate or Carbonates such as calcium carbonate, sulfates such as ammonium sulfate, magnesium sulfate, iron sulfate or copper sulfate.
  • Other inorganic salts that can be used are, for example, halides, such as potassium bromide or potassium iodide.
  • the medium may include additional macro or micronutrients such as amino acids, purines, pyrimidme, com steep liquor, protein hydrolyzates, vitamins (water soluble and / or water insoluble) and other media components well known to those skilled in the art. Anti-foaming agents can be added if necessary.
  • the medium can contain complex components or be chemically defined.
  • the amount of the individual components can vary as long as there is no negative effect on the growth or productivity of the microorganisms.
  • the person skilled in the art can easily determine the composition according to the needs of the microorganism in the individual case.
  • the carbon source is added in a concentration of 50 to 300 g / L and the nitrogen source in a concentration of 1 to 30 g / L.
  • the nitrogen content is preferably made dependent on the carbon content of the medium.
  • a particularly preferred low salt medium optionally comprises, in addition to further constituents such as, for example, nutritional constituents, at least one salt selected from the group consisting of magnesium sulfate, calcium carbonate and potassium phosphate, where the salt (s) are preferably added at a maximum of 3 g / L each, particularly preferably at a maximum of 1 g / L each, without the total salt content according to the invention being exceeded. It is particularly preferred if magnesium sulfate, calcium carbonate and potassium phosphate are added to the medium.
  • Preferred nutritive components are glucose, yeast extract and / or corn steep liquor (Com Steep Liqour [CSL]) in the usual amounts and other nutritional components familiar to the person skilled in the art.
  • CSL Corn steep liquor
  • the pH of the medium is adjusted to a range from 3 to 10, preferably 4 to 8, particularly preferably 5 to 7 and very particularly preferably 6 by adding an appropriate acid or alkali.
  • the medium is then sterilized.
  • Techniques for sterilizing media are well known to the person skilled in the art, for example autoclaving and sterile filtration.
  • the cultivation can take place in batch, fed-batch or in a continuous manner, as is generally known to the person skilled in the art.
  • Batch or fed-batch cultivation is usually carried out over 1 to 12 days, preferably 2-10 days, particularly preferably for 3-9 days.
  • the media components can be added to the low salt medium individually or as a mixture, and a pre-prepared mixture is also conceivable.
  • the components in particular the carbon and nitrogen source (s) or certain medium additives, can be added before or during the cultivation. The addition can be repeated one or more times or continuously.
  • the PUFAs produced are generally in the form of neutral fats, for example as triacylglycerides or polar lipids such as, for example, phosphatidylcholine, phosphatidylethanolamine or phosphatidylinositol.
  • the terms PUFA, n3 fatty acid or n3 active substances are understood to mean all possible forms in which the corresponding fatty acids can be present, ie both as free fatty acids, esters, triglycerides, phospholipids or other derivatives. All these substances are summarized below and the terms are used synonymously.
  • the PUFAs can be converted and enriched by chemical or biocatalytic transesterification, for example with the aid of suitable enzymes (lipases), before or after isolation from the culture.
  • FIG. 1 shows the product formation of DHA as a function of the salt concentration. The maximum can be clearly seen in the area according to the invention (data from Example 1)
  • Figure 2 shows biomass and DHA content depending on the salt concentration. The maximum in the range according to the invention can also be clearly seen here (data from Example 1).
  • the fermentation medium on which the process according to the invention is based is described below with the aid of a few examples. However, the fermentation medium and the invention are not restricted to these examples.
  • Example 1 Influence of different amounts of salt in the medium on the production of PUFA by Ulkenia sp. SAM 2179.
  • Strain SAM 2179 (Ulkenia spec BP-5601; WO9803671) was cultivated in 300 ml Erlenmeyer flasks with a chicane in 50 ml medium (temperature: 28 ° C, shaking rate: 150 rpm).
  • Yeast extract (g / L): 12.5 [Difco] pH adjusted to 6.0 with HC1
  • the salts of Medium 1 were used in the following concentrations: IX (Medium 1), 0.75X (Medium 1.1), 0.5X (Medium 1.2), 0.25X (Medium 1.3) and 0.1X (Medium 1.4).
  • the cells were harvested after 48 h of cultivation by centrifugation. The cells were then freeze-dried and the dry biomass was determined. The cells were disrupted and the fatty acids were determined by heat treatment for 2 hours in 10% strength methanolic hydrochloric acid at 60 ° C. (with stirring). The esters were then analyzed in a gas chromatograph to determine the fatty acid composition (Wanasundara, UN, Wanasundara, J., Shahidi, F., Omega-3 fatty acid concentrates: a review of production technologies, Seafoods - Quality, Technology and Nutraceutical Applications, 2002, Pp. 157-174).
  • BTM dry organic matter
  • DHA / BTM % by weight DHA (docosahexaenoic acid) per unit weight BTM; g / Lxd space-time yield in grams per liter per day; left: hour; VB: comparative example.
  • Example 2 Production of PUFA by Ulkenia sp. SAM 2179 in various fermentation media.
  • Strain SAM 2179 was cultivated in 300 ml Erlerrmeyer flasks with a chicane in 50 ml medium (temperature: 28 ° C, shaking rate: 150 rpm).
  • DH2 medium (without salt): glucose monohydrate (g / L): 56.25 yeast extract (g / L): 12.5 [Difco] pH adjusted to 6.0 with HC1
  • DH3 medium (with salt supplement without sodium and without chloride addition):
  • the cells were harvested after 48 h of cultivation by centrifugation. The cells were then freeze-dried and the dry biomass was determined. Disruption of the cells and The fatty acids were determined by heat treatment for 2 hours in 10% strength methanolic hydrochloric acid at 60 ° C. (with stirring). The esters were then analyzed in a gas chromatograph to determine the fatty acid composition.
  • the low salt medium according to the invention without sodium and chloride addition was first used in the fermentation in a concentration of about 10% of the sea water salt content (medium 3).
  • the biomass obtained is somewhat lower than that of fermentations with about 50% sea water salt content, but the DHA content per dry biomass is larger and surprisingly leads to a total. same or even increased space-time yields (see Table 3). This is of great advantage for later processing of the biomass for the production of DHA.
  • the addition of sodium and / or chloride (the main salts of sea water) can advantageously be completely dispensed with for the fermentation.
  • Example 3 Influence of different amounts of salt in the medium without sodium and chloride salt addition on the production of PUFA by Ulkenia sp. SAM 2179.
  • Strain SAM 2179 was cultivated in 300 ml Erlenmeyer flasks with a chicane in 50 ml medium (temperature: 28 ° C, shaking rate: 150 rpm).
  • Medium 3 DH3 medium (with salt supplement without sodium and without chloride addition) glucose monohydrate (g / L): 56.25
  • Yeast extract (g / L): 12.5 [Difco] magnesium sulfate (g / L): 1 calcium carbonate (g / L) 1.
  • IX salts of potassium phosphate (g / L) 1 pH adjusted to 6.0 with H 2 SO 4
  • the salts of medium 3 were used in the following concentrations: 10X with 10 g / L each, 2X with 2 g / L each, IX with 1 g / L each, 0.5X with 0.5 g / L each or 0.25X with 0 each, 25g / L.
  • the cells were harvested after 48 hours of cultivation by centrifugation. The cells were then freeze-dried and the dry biomass was determined. The cells were disrupted and the fatty acids were determined by heat treatment for 2 hours in 10% strength methanolic hydrochloric acid at 60 ° C. (with stirring). The esters were then analyzed in gas chromatograph to determine the fatty acid composition.
  • the microorganism Ulkenia spec. was used to determine the optimum salt concentration of the fermentation medium without the addition of sodium or chloride.
  • the productivity in terms of space-time yield is also at an optimal value at this salinity (see Table 4).
  • Example 4 Production of PUFA by Schizochytrium strain SR21 (Schizochytrium spec, MYA-1381; EP0823475) in different fermentation media:
  • Schizochytrium strain SR21 was cultivated in 300 ml Erlenmeyer flasks with a chicane in 50 ml medium (temperature: 28 ° C, shaking rate: 150 rpr ⁇ ).
  • DH2 medium (without salt) glucose monohydrate (g / L): 56.25 yeast extract (g / L): 12.5 [Difco] pH adjusted to 6.0 with HC1
  • the low salt medium described in the invention also leads to an optimization of the production of PUFA in other labyrinthulomycota organisms.
  • the microorganism Schizochytrium spec. Strain SR21 can be fermented in low salt medium without sodium or chloride addition.
  • the DHA content based on the dry matter also has an optimum in this case with a salt content of 10% of the sea water.
  • there is an even stronger effect on the space-time yield of DHA and thus on the productivity of the fermentation see Table 5
  • the DHA content based on the entire fatty acid spectrum is also somewhat lower in this case (see Table 6), but this does not harm a surprisingly high space-time yield of DHA (see Table 5).
  • the optimized low salt medium on which the invention is based leads to a general increase in the production of PUFAs in various members of the labyrinthulomycota.

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Abstract

L'invention concerne un procédé optimisé pour cultiver des micro-organismes de l'ordre des Thraustochytriales, selon lequel les micro-organismes sont cultivés dans un milieu faiblement salin sans addition de sel de sodium ni de sel de chlorure, pour une teneur totale en sel inférieure à 3,5g/L (correspondant à moins de 10 % de la teneur en sel de l'eau de mer), les acides gras polyinsaturés (PUFA) étant ensuite isolés des micro-organismes et/ou du milieu. L'invention concerne en particulier de nouveaux milieux optimisés à teneur totale en sel et en NaCl sensiblement réduite. Selon l'invention, une nouvelle combinaison de différents sels en tant que composition d'un milieu contenant, dans la somme des pourcentages en poids, pas plus de 1,75 g/L d'ions Na<+> et d'ions Cl<->, permet de perfectionner et de simplifier notablement la production des PUFA. En outre, le milieu décrit est de préférence totalement exempt d'additions de sel de sodium et de sel de chlorure, ce qui contribue à éviter la pollution environnementale par des eaux usées salées.
EP04818134A 2003-11-10 2004-11-10 Procede pour cultiver des micro-organismes de l'ordre des i thraustochytriales /i dans un milieu faiblement salin optimise Withdrawn EP1685241A2 (fr)

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EP20140002902 EP2816104A1 (fr) 2003-11-10 2004-11-10 Procédé de culture de micro-organismes de la famille des thraustochytriales en utilisant un milieu optimisé à faible teneur en sel

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DE2003152838 DE10352838A1 (de) 2003-11-10 2003-11-10 Verfahren zur Kultivierung von Mikroorganismen der Gattung Thraustochytriales unter Verwendung eines optimierten Niedrigsalzmediums
PCT/EP2004/012718 WO2005045003A2 (fr) 2003-11-10 2004-11-10 Procede pour cultiver des micro-organismes de l'ordre des thraustochytriales dans un milieu faiblement salin optimise

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EP20140002902 Division EP2816104A1 (fr) 2003-11-10 2004-11-10 Procédé de culture de micro-organismes de la famille des thraustochytriales en utilisant un milieu optimisé à faible teneur en sel

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EP1685241A2 true EP1685241A2 (fr) 2006-08-02

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EP20140002902 Withdrawn EP2816104A1 (fr) 2003-11-10 2004-11-10 Procédé de culture de micro-organismes de la famille des thraustochytriales en utilisant un milieu optimisé à faible teneur en sel
EP04818134A Withdrawn EP1685241A2 (fr) 2003-11-10 2004-11-10 Procede pour cultiver des micro-organismes de l'ordre des i thraustochytriales /i dans un milieu faiblement salin optimise

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EP20140002902 Withdrawn EP2816104A1 (fr) 2003-11-10 2004-11-10 Procédé de culture de micro-organismes de la famille des thraustochytriales en utilisant un milieu optimisé à faible teneur en sel

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US (2) US8900831B2 (fr)
EP (2) EP2816104A1 (fr)
JP (1) JP4791367B2 (fr)
KR (1) KR101238613B1 (fr)
CN (2) CN1977038B (fr)
AU (1) AU2004287954B2 (fr)
BR (1) BRPI0416360A (fr)
CA (1) CA2545410A1 (fr)
DE (1) DE10352838A1 (fr)
EA (1) EA011858B1 (fr)
IL (1) IL175520A (fr)
SG (1) SG148157A1 (fr)
WO (1) WO2005045003A2 (fr)
ZA (1) ZA200603854B (fr)

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KR102027632B1 (ko) * 2016-12-06 2019-10-01 국립해양생물자원관 고온성 미생물 배양용 고체배지조성물 및 그 제조방법
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CA2545410A1 (fr) 2005-05-19
ZA200603854B (en) 2007-11-28
JP4791367B2 (ja) 2011-10-12
US20150104557A1 (en) 2015-04-16
EA011858B1 (ru) 2009-06-30
WO2005045003A3 (fr) 2005-08-04
CN1977038B (zh) 2014-12-24
IL175520A0 (en) 2006-09-05
IL175520A (en) 2014-08-31
BRPI0416360A (pt) 2007-05-08
US20070054384A1 (en) 2007-03-08
KR20070042115A (ko) 2007-04-20
DE10352838A1 (de) 2005-07-07
JP2007510422A (ja) 2007-04-26
EA200600947A1 (ru) 2007-02-27
SG148157A1 (en) 2008-12-31
AU2004287954A1 (en) 2005-05-19
CN104073442A (zh) 2014-10-01
WO2005045003A2 (fr) 2005-05-19
KR101238613B1 (ko) 2013-02-28
EP2816104A1 (fr) 2014-12-24
AU2004287954B2 (en) 2010-04-29
CN1977038A (zh) 2007-06-06
US8900831B2 (en) 2014-12-02

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