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CN103725617A - Aurantiochytrium sp. rich in glyceride type DHA (Docosahexaenoic Acid) and application thereof - Google Patents

Aurantiochytrium sp. rich in glyceride type DHA (Docosahexaenoic Acid) and application thereof Download PDF

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Publication number
CN103725617A
CN103725617A CN201410000036.XA CN201410000036A CN103725617A CN 103725617 A CN103725617 A CN 103725617A CN 201410000036 A CN201410000036 A CN 201410000036A CN 103725617 A CN103725617 A CN 103725617A
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China
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dha
aurantiochytrium
cgmcc
lipids
thraustochytrium
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CN201410000036.XA
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刘瑛
李晶晶
张善发
成家杨
温志友
袁文桥
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Peking University Shenzhen Graduate School
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Peking University Shenzhen Graduate School
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Abstract

The invention relates to an aurantiochytrium (i) sp. which is bred and is used for producing glyceride type DHA (Docosahexaenoic Acid), and an application thereof. The aurantiochytrium sp. is separated from coastal waters of Shenzhen of China and is preserved in China General Microbiological Culture Collection Center (CGMCC) on December 13, 2013; the preservation number is CGMCC No.8575. The content of non-polar lipids of an aurantiochytrium sp. strain in total lipids is high and the aurantiochytrium sp. is the strain rich in the glyceride type DHA and can be applied to industrially producing the glyceride type DHA.

Description

Thraustochytriale Aurantiochytrium sp. and the application thereof of glyceryl ester type DHA is rich in one strain
Technical field
The present invention relates to microorganism thraustochytriale aurantiochytriumsp. CGMCC No. 8575, and the main component of its lipid is non-polar lipid, and wherein to account for total lipid content high for DHA, can obtain the glyceryl ester type DHA of high yield, are applicable to the industrial production of glyceryl ester type DHA.
Background technology
Polyunsaturated fatty acid (polyunsaturated fatty acids, PUFAs) be to keep one of important nutritive ingredient of HUMAN HEALTH, particularly DHA and timnodonic acid (eicosapentaenoic acids, EPA) have very important medical applications and nutritive value.
In food service industry, glyceryl ester type DHA can be added in milk or milk powder, as functional nutrient material.
At present, the commercial source of DHA is mainly deep sea fish oil, and sardines, fin fish etc. contains higher fatty tissue, in a lot of countries, is all used to produce fish oil, and in fish oil, the content of DHA can reach 20-30%.But the fish oil of take has a lot of shortcomings as raw material production DHA, as unstable in fish oil output, containing having a fish like smell, may there is heavy metal contamination in complicated component.
In ocean environment, microorganism is only the original producer of DHA as marine microalgae, fungi etc.In these microorganisms, the relative content of DHA will be far above the content in fish oil.
Thraustochytriale is the Mycophyta protobiont of a class heterotrophism, in recent years because its wide biotechnology applications prospect receives much concern.Thraustochytriale can be used for producing extracellular enzyme, exocellular polysaccharide, carotenoid, omega-3 polyunsaturated fatty acids as DHA and EPA, and the biologically active substance of some other industrial application.
The lipid acid of thraustochytriale forms simply, culture condition cost is low, utilizes thraustochytriale to produce DHA, can effectively solve the problem that fish oil DHA exists.Therefore,, as the new production source of polyunsaturated fatty acid, thraustochytriale is to have the microorganism that potentiality are carried out suitability for industrialized production DHA.
Summary of the invention
The object of the present invention is to provide the high thraustochytriale of glyceryl ester type DHA content aurantiochytriumsp. CGMCC No. 8575, can be used for suitability for industrialized production DHA, make an addition in milk, milk powder or healthcare products.
According to the present invention, provide a kind of glyceryl ester type DHA output high, be preserved in China Committee for Culture Collection of Microorganisms's common micro-organisms center (China General Microbiological Culture Collection Center, CGMCC), deposit number is the thraustochytriale of CGMCC No. 8575.The Classification And Nomenclature of this bacterial strain is aurantiochytriumsp.; Depositary institution address is No. 3, Yard 1, BeiChen xi Road, Chaoyang District, Beijing City, Institute of Microorganism, Academia Sinica; Preservation date is on December 13rd, 2013.
This bacterial strain is in July, 2012, separated from Tai Pang Wan coastal waters, Shenzhen.The feature of separation method is: adopt different antibiotic combinations, utilize the Pollen Pini seed selection of fishing.When thraustochytriale is enriched in Pollen Pini edge, picking preserved egg powder, streak culture on agar plate, after 3-5 days, picking list bacterium colony is streak culture on new agar plate, to obtain purebred thraustochytriale.According to this separation method, from a sampling point, obtain altogether 8 strain thraustochytriales.
In the present invention, relate to extraction and the analysis of thraustochytriale lipid.Its feature is: utilize chloroform: the mixture of methyl alcohol=1:2 system, as extraction solvent, extracts intracellular TL, by chromatography of gases, result is analyzed, thereby is selected the bacterial strain that DHA content is high, aurantiochytriumsp. CGMCC No. 8575.
In the present invention, the isolation identification that also comprises thraustochytriale non-polar lipid.Utilize Nile red dyeing, at fluorescence microscopy Microscopic observation, show thraustochytriale aurantiochytriumsp. in CGMCC No. 8575 born of the same parents, non-polar lipid content is high, and quantitative analysis shows, the thraustochytriale of freeze-drying aurantiochytriumsp. CGMCC No. 8575 every gram comprise 0.65-0.85g lipid, wherein approximately have 75% for non-polar lipid, wherein glyceryl ester type DHA accounts for 73% of total DHA.
According to the present invention, thraustochytriale aurantiochytriumsp. in CGMCC No. 8575 cells, lipid acid is mainly DHA and hexadecanoic acid, the 80-90% that both sums are fatty acid content, and hexadecanoic acid content can reach 35-65%.The hexadecanoic acid of high-content illustrates that this bacterial strain is also applicable to the industrial production of biofuel.
Embodiment
The present invention found to be present in the thraustochytriale in China Shenzhen coastal waters, and selected the bacterial strain that glyceryl ester type DHA is rich in a strain.18S rRNA sequencing result shows that this thraustochytriale is aurantiochytriumsp., this bacterial strain is named as aurantiochytriumsp. PKU#SW7, is preserved in China Committee for Culture Collection of Microorganisms's common micro-organisms center (China General Microbiological Culture Collection Center, CGMCC), and deposit number is CGMCC No. 8575.
Thraustochytriale aurantiochytriumsp. CGMCC No. 8575 is preserved on agar plate.Nutrient agar is composed as follows: in every 100ml filtering sea, contain glucose 1g, peptone 0.15g, yeast extract 0.01g, agar 1g.By streak culture thraustochytriale aurantiochytriumsp. CGMCC No. 8575 is placed in room temperature preservation.
Can prepare inoculation culture liquid according to following scheme.
The well-grown bacterium colony of picking from the agar plate of preservation, cultivates in access 10-20ml sea water medium, as inoculation liquid.Inoculation liquid, after cultivating 2 days, is inoculated in fresh sea water medium to be greater than 5% ratio.Culture condition temperature is 25-30 ℃, and rotating speed is 160rpm, after cultivating 4 days, and biomass collection.
In culturing process, utilize Nile red dye to thraustochytriale aurantiochytriumsp. CGMCC No. 8575 cells dye, and in fluorescence microscopy Microscopic observation, its non-polar lipid content of the golden yellow fluorescence display in cell paste is high.
Take a certain amount of freeze-drying biomass samples, can utilize chloroform: the mixture of methyl alcohol=1:2 system, as extraction solvent, extracts intracellular TL.First, the dried biomass taking is placed in tool plug triangular flask, add after extraction solvent, chloroform is added in 160rpm vibration after 1 hour: methyl alcohol=1:1 system solvent, mix rear standing 1h, and migrate out chloroform layer, nitrogen blows the concentrated TL that obtains.The 65-85% that acquisition total lipid content is dry cell weight, i.e. every gram of thraustochytriale aurantiochytriumsp. the amount that CGMCC No. 8575 freeze drying cell contain lipid is 0.65-0.85g.
The TL extracting is carried out to column chromatography separation.Adopt sigma Discovery DSC-NH 2solid-phase extraction column, utilizes the aging pillar of normal hexane, with normal hexane: the system loading of chloroform: methyl alcohol=95:3:2.First non-polar lipid part obtains by chloroform wash-out, and polar lipid part obtains by two step wash-outs, and the first step adopts methyl alcohol: chloroform=6:1 wash-out, second step adopts 0.05M sodium acetate soln, and (solvent is methyl alcohol: chloroform=6:1) wash-out.Result shows that non-polar lipid accounts for 75% left and right of TL.
The non-polar lipid that coupled columns chromatographic separation obtains is carried out thin-layer chromatographic analysis.Adopt G type tlc silica gel plate, carry out two-dimentional chromatographic separation.In first direction, adopting normal hexane: ether=80:20 is developping agent, and second direction adopts normal hexane: ether: methyl alcohol=70:20:10 is developping agent.Result shows that the main component in non-polar lipid is triglyceride level.
TL, non-polar lipid and polar lipid are carried out respectively to transesterification.Adopt 4% sulfuric acid methanol solution, in 80 ℃ of transesterification reactions 1 hour, be cooled to after room temperature, use normal hexane extracting, for chromatography of gases analysis.Find that DHA accounts for the 28-35% of total lipid content, in non-polar lipid, the content of DHA is 20-25%, and glyceryl ester type DHA reaches 73% left and right of total DHA content, shows thraustochytriale aurantiochytriumsp. CGMCC No. 8575 is bacterial strains that a strain is highly suitable for producing glyceryl ester type DHA.

Claims (7)

1.一株富含甘油酯型DHA的破囊壶菌Aurantiochytrium sp. CGMCC No. 8575,其特征在于:保藏于中国微生物菌种保藏管理委员会普通微生物中心(China General Microbiological Culture Collection Center, CGMCC)。 1. A Thraustochytrium sp. CGMCC No. 8575 rich in glyceride-type DHA, characterized in that it is preserved in the China General Microbiological Culture Collection Center (CGMCC). 2.根据权利要求1,从深圳大鹏湾沿海水域分离出破囊壶菌,并从中挑选出了一株富含甘油酯型DHA的菌株,实验室编号为Aurantiochytrium sp. PKU#SW7,保藏编号为CGMCC No. 8575。 2. According to claim 1, Thraustochytrium was isolated from the coastal waters of Dapeng Bay, Shenzhen, and a bacterial strain rich in glyceride type DHA was selected therefrom. The laboratory number is Aurantiochytrium sp. PKU#SW7, and the deposit number is It is CGMCC No. 8575. 3.权利要求2中所述的分离方法,其特点在于:采用不同的抗生素组合,利用松花粉垂钓选育,当破囊壶菌富集于松花粉边缘时,挑取松花粉粒,划线培养于琼脂平板上,3-5天后,挑取单菌落划线培养于新的琼脂平板上,以获得纯种破囊壶菌。 3. The separation method described in claim 2 is characterized in that: adopt different combinations of antibiotics, utilize pine pollen to fish and breed, and when Thraustochytrium is enriched in the edge of pine pollen, pick pine pollen grains, draw a line Culture on agar plate, after 3-5 days, pick a single colony and streak culture on a new agar plate to obtain pure thraustochytrium. 4.权利要求1和2中所述的破囊壶菌Aurantiochytriumsp. CGMCC No. 8575,其生产DHA的特征在于:DHA为总脂肪酸含量的25-45%,其中甘油酯型DHA占总DHA的73%左右。 4. the thraustochytrium Aurantiochytrium sp. CGMCC No.8575 described in claim 1 and 2, it is characterized in that producing DHA: DHA is the 25-45% of total fatty acid content, and wherein glyceride type DHA accounts for total DHA About 73%. 5.根据权利要求4,其包含在海水培养基中培养微生物,利用尼罗红染色法,在显微镜下检测非极性脂质。 5. According to claim 4, which comprises cultivating microorganisms in seawater culture medium, utilizing Nile Red staining, detecting non-polar lipids under a microscope. 6.根据权利要求4,收集生物质后进行冷冻干燥,从干燥细胞中提取脂质,将提取的脂质通过柱色谱分离,分别得到非极性脂质(脂肪酸甘油酯)和极性脂质(磷酸甘油酯),对非极性脂质部分进行薄层色谱分析,发现甘油三酯为非极性脂质的主要成分。 6. According to claim 4, after collecting the biomass, carry out freeze-drying, extract lipids from the dried cells, and separate the extracted lipids by column chromatography to obtain non-polar lipids (fatty acid glycerides) and polar lipids respectively (phosphoglycerides), TLC analysis of the nonpolar lipid fraction revealed triglycerides as the major component of the nonpolar lipids. 7.根据权利要求6,破囊壶菌Aurantiochytrium sp. CGMCC No. 8575的细胞脂质中,75%左右为非极性脂质,甘油酯型DHA占总DHA的73%左右。 7. According to claim 6, in the cell lipids of Aurantiochytrium sp. CGMCC No. 8575, about 75% are non-polar lipids, and glyceride DHA accounts for about 73% of the total DHA.
CN201410000036.XA 2014-01-01 2014-01-01 Aurantiochytrium sp. rich in glyceride type DHA (Docosahexaenoic Acid) and application thereof Pending CN103725617A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111718858A (en) * 2020-07-12 2020-09-29 天津大学 Thraustochytrium fatty acid production method based on nitrogen-limited culture and phytohormone regulation

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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