WO2018099452A1 - 一种产l-异亮氨酸谷氨酸棒杆菌发酵培养基及培养方法 - Google Patents

一种产l-异亮氨酸谷氨酸棒杆菌发酵培养基及培养方法 Download PDF

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WO2018099452A1
WO2018099452A1 PCT/CN2017/114198 CN2017114198W WO2018099452A1 WO 2018099452 A1 WO2018099452 A1 WO 2018099452A1 CN 2017114198 W CN2017114198 W CN 2017114198W WO 2018099452 A1 WO2018099452 A1 WO 2018099452A1
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fermentation
isoleucine
medium
vitamin
producing
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PCT/CN2017/114198
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French (fr)
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梅雪臣
王炯
万坤
宋盟军
邢盼盼
苏海霞
李敬
刘爱福
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武汉远大弘元股份有限公司
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Priority to EP17875998.1A priority Critical patent/EP3550026B1/en
Priority to JP2019549626A priority patent/JP6854911B2/ja
Priority to US16/465,838 priority patent/US11319563B2/en
Publication of WO2018099452A1 publication Critical patent/WO2018099452A1/zh

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    • 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
    • C12P13/00—Preparation of nitrogen-containing organic compounds
    • C12P13/04—Alpha- or beta- amino acids
    • C12P13/06—Alanine; Leucine; Isoleucine; Serine; Homoserine
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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    • C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
    • C12N1/20—Bacteria; Culture media therefor
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    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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    • C12N2500/00—Specific components of cell culture medium
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    • C12N2500/34—Sugars
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    • 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
    • C12N2500/00—Specific components of cell culture medium
    • C12N2500/30—Organic components
    • C12N2500/38—Vitamins
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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    • C12N2500/00—Specific components of cell culture medium
    • C12N2500/70—Undefined extracts
    • C12N2500/76—Undefined extracts from plants

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  • the invention belongs to the field of microbial fermentation, and particularly relates to a fermentation medium and a culture method for Corynebacterium glutamicum for producing L-isoleucine.
  • L-isoleucine In recent years, with the deepening of the application of L-isoleucine in the medical and health care, food processing and feed industries, the market demand for L-isoleucine is growing. Although L-isoleucine has been industrially produced, the current production is still insufficient. At present, the demand for L-isoleucine in China is large, and the annual demand is increasing year by year. China's L-isoleucine production faces many problems such as low acid production, low conversion of sugar and acid, and low extraction rate.
  • the acid production level of L-isoleucine in China is 25-30g/L
  • the extraction rate is 65-70%
  • the highest sugar acid conversion rate in China is 18-20%
  • the general sugar acid conversion rate is about 15%.
  • the object of the present invention is to provide a fermentation medium and a culture method for producing L-isoleucine-producing Corynebacterium glutamicum for the current low production efficiency of L-isoleucine, and using the fermentation medium and The culture method can greatly increase the conversion rate of sugar acid, thereby improving production efficiency.
  • the invention provides a fermentation medium for producing L-isoleucine C. glutamicum, comprising a basal medium and a growth factor, wherein the growth factor is composed of choline, betaine and vitamin B6, and each component comprises a fermentation medium.
  • the content is choline 0.2-1g/L, betaine 0.25-0.5mg/L, vitamin B6 0.05-0.3mg/L.
  • the basal medium is composed of the following components, and the content of each component in the fermentation medium is: 15-25 ml/L of corn syrup, 240-300 g/L of glucose, 20-25 g/L of urea, and dipotassium hydrogen phosphate 0.4. -0.8g/L, magnesium sulfate 0.6-0.8g/L, Vitamin B1 0.2-0.4mg/L, ferrous sulfate 0.015-0.03mg/L, corn oil 1-5ml/L, silk peptide powder 2-4g/L, defoamer 30-50ml/L.
  • each component in the fermentation medium is: corn syrup 15 ml / L, glucose 240 g / L, urea 25 g / L, dipotassium hydrogen phosphate 0.4 g / L, magnesium sulfate 0.6 g / L, vitamin B1 0.3 mg /L, ferrous sulfate 0.015mg / L, corn oil 1ml / L, betaine 0.3mg / L, silk peptide powder 3g / L, vitamin B6 0.3mg / L, choline 0.5g / L, defoamer 34ml / L.
  • the method for fermenting L-isoleucine-producing C. glutamicum comprises: inoculating L-isoleucine-producing C. glutamicum into the fermentation medium, and the volume of the bacterial liquid accounts for fermentation culture. 5-20% of the base volume, ammonia water adjusts the pH to 6.5-7, dissolved oxygen is controlled at 30-50%, fermentation is 25-30h; then dissolved oxygen is reduced to 15-25%, and 50-80 is added to the fermentation broth. The % glucose solution controls the residual sugar to 3-4%, and the fermentation is continued until 60-70 hours to terminate the fermentation, and the temperature of the whole fermentation process is controlled at 29-33 °C.
  • the fermentation culture method is: inoculating L-isoleucine-producing Corynebacterium glutamicum into the fermentation medium according to any one of claims 1 to 3, wherein the volume of the bacterial liquid accounts for 10% of the volume of the fermentation medium.
  • Ammonia water adjusts the pH to 6.8, dissolved oxygen is controlled at 30%, fermentation is 26h; then dissolved oxygen is reduced to 20%, and 80% glucose solution is added to the fermentation liquid to control the residual sugar to 3.5%, and the fermentation is continued to 70 hours to terminate the fermentation.
  • the temperature of the entire fermentation process was controlled at 31 °C.
  • the invention can provide growth factors for glutamic acid glutamicum, maintain the balance of osmotic pressure inside and outside the cell, and promote amino acid by adding choline, betaine and vitamin B6 growth factors to the culture medium. Anabolic, thereby increasing the yield of L-isoleucine and the conversion of sugar acid.
  • the medium and the culture method provided by the present invention have a high production efficiency, a short production cycle, and the like.
  • a fermentation medium for producing L-isoleucine glutamicum which consists of a basal medium and a growth factor, and the content of each component in the fermentation medium is:
  • Basic medium corn syrup 15ml/L, glucose 240g/L, urea 25g/L, dipotassium hydrogen phosphate 0.4g/L, magnesium sulfate 0.6g/L, vitamin B1 0.3mg/L, ferrous sulfate 0.015mg/L , corn oil 1ml / L, silk peptide powder 3g / L, defoamer 34ml / L.
  • Growth factors betaine 0.3 mg / L, choline 0.5 g / L, vitamin B6 0.3 mg / L.
  • Liquid seed culture medium glucose 1g/L, corn syrup 10ml/L, urea 1g/L, anhydrous magnesium sulfate 0.5g/L, Dipotassium hydrogen phosphate 1g / L, silk peptide powder 0.1g / L, vitamin B1 0.1mg / L, corn oil 0.1g / 100ml, calcium carbonate 2g / 100ml; pH 7.0 adjusted with NaOH, sterilization at 121 ° C for 20min.
  • the L-isoleucine-producing Corynebacterium glutamicum on the inclined surface of the test tube was picked and inoculated into a seed culture, and cultured in a reciprocating shaker at 31 ° C and 105 rpm for 24 hours to obtain a seed culture solution.
  • Fermentation culture method of Corynebacterium glutamicum Inoculating Corynebacterium glutamicum into the above fermentation medium, the volume of the bacterial liquid accounts for 10% of the volume of the fermentation medium, the pH of the ammonia water is adjusted to 6.8, the dissolved oxygen is controlled at 30%, and the fermentation is 26 hours. Then, the dissolved oxygen is reduced to 20%, and a glucose solution having a weight of 80% is added to the fermentation liquid to control the residual sugar to be 3.5% by weight, and the fermentation is continued until 70 hours to terminate the fermentation, and the temperature of the entire fermentation process is controlled. 31 ° C.
  • a fermentation medium for producing L-isoleucine glutamic acid glutamicum which is composed of a basic medium and a growth factor, and the content of each component in the fermentation medium is:
  • Fermentation culture method of Corynebacterium glutamicum Inoculating Corynebacterium glutamicum into fermentation medium, the volume of the bacterial liquid accounts for 5% of the volume of the fermentation medium, the pH of the ammonia water is adjusted to 6.5, the dissolved oxygen is controlled at 30%, and the fermentation is for 25 hours; Then, the dissolved oxygen was reduced to 15%, and 80% glucose solution was added to the fermentation liquid to control the residual sugar to 3%, and the fermentation was continued until 60 hours to terminate the fermentation, and the temperature of the entire fermentation process was controlled at 33 °C.
  • a fermentation medium for producing L-isoleucine glutamic acid glutamicum which is composed of a basic medium and a growth factor, and the content of each component in the fermentation medium is:
  • Fermentation culture method of Corynebacterium glutamicum Inoculating Corynebacterium glutamicum into fermentation medium, the volume of the bacterial liquid accounts for 20% of the volume of the fermentation medium, the pH of the ammonia water is adjusted to 7, the dissolved oxygen is controlled at 50%, and the fermentation is 30 hours; The dissolved oxygen was then reduced to 25%, and a 50% glucose solution was added to the fermentation broth to control the residual sugar to 4%. The fermentation was continued until 70 hours to terminate the fermentation, and the temperature of the entire fermentation process was controlled at 29 °C.
  • a fermentation medium for producing L-isoleucine glutamic acid glutamicum which is composed of a basic medium and a growth factor, and the content of each component in the fermentation medium is:
  • Fermentation culture method of Corynebacterium glutamicum inoculating Corynebacterium glutamicum into fermentation medium, the volume of the bacterial liquid accounts for 15% of the volume of the fermentation medium, the pH of the ammonia water is adjusted to 6.7, the dissolved oxygen is controlled at 40%, and the fermentation is 28 hours; Then, the dissolved oxygen was reduced to 18%, and a 70% glucose solution was added to the fermentation liquid to control the residual sugar to 3.8%. The fermentation was continued until 64 hours to terminate the fermentation, and the temperature of the entire fermentation process was controlled at 30 °C.
  • a fermentation medium for producing L-isoleucine glutamic acid glutamicum which is composed of a basic medium and a growth factor, and the content of each component in the fermentation medium is:
  • Fermentation culture method of Corynebacterium glutamicum Inoculating Corynebacterium glutamicum into fermentation medium, the volume of the bacterial liquid accounts for 12% of the volume of the fermentation medium, the pH of the ammonia water is adjusted to 6.8, the dissolved oxygen is controlled at 30%, and the fermentation is for 27 hours; The dissolved oxygen was then reduced to 20%, and 80% glucose solution was added to the fermentation broth to control the residual sugar to 3.5%. The fermentation was continued until 70 hours to terminate the fermentation, and the temperature of the entire fermentation process was controlled at 32 °C.
  • the fermentation culture method was the same as in Example 1.

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Abstract

一种产L-异亮氨酸谷氨酸棒杆菌发酵培养基，包括基础培养基和生长因子，所述生长因子由胆碱、甜菜碱和维生素B 6组成，各成分占发酵培养基的含量为胆碱0.2-1g/L，甜菜碱0.25-0.5mg/L，维生素B 60.05-0.3mg/L。一种产L-异亮氨酸谷氨酸棒状杆菌培养方法，将产L-异亮氨酸谷氨酸棒状杆菌接种到发酵培养基中，菌液体积占发酵培养基体积的5-20％，氨水调节pH至6.5-7，溶氧控制在30-50％，发酵25-30h；然后将溶氧降低到15-25％，并向发酵液中流加50-80％葡萄糖溶液控制残糖为3-4％，继续发酵至60-70小时终止发酵，整个发酵过程的温度控制在29-33℃。

Description

一种产L-异亮氨酸谷氨酸棒杆菌发酵培养基及培养方法
本申请要求申请日为2016年12月02日的中国专利申请CN201611093973.X的优先权。本申请引用上述中国专利申请的全文。
技术领域
本发明属于微生物发酵领域，具体涉及一种用于产L-异亮氨酸的谷氨酸棒杆菌发酵培养基及培养方法。
背景技术
近年来，随着L-异亮氨酸在医药保健、食品加工饲料工业中的应用研究不断深入，市场对L-异亮氨酸的需求在不断生长。L-异亮氨酸虽已实现工业化生产，但目前产量仍不能满足需要。目前，我国L-异亮氨酸的需求缺口较大，并且年需量逐年增加。我国的L-异亮氨酸生产面临产酸低、糖酸转化率低、提取率低等诸多问题。我国L-异亮氨酸产酸水平为25-30g/L，提取率为65-70％，国内最高糖酸转化率为18-20％，普遍糖酸转化率在15％左右。江南大学2014年申请专利CN104480057A中，糖酸转化率仅为12.4％；天津科技大学2015年申请专利CN104878051A专利中5L发酵罐产酸为40.05g/L,糖酸转化率为18.7％；而日本L-异亮氨酸产酸水平为30-35g/L，提取率为70-75％(李静等，CN104450815A，2014)。日本味之素据报道L-异亮氨酸产酸水平3.5％，提取率在70％(冯珍全等，L-异亮氨酸的应用现状及其前景展望，2013)。近年来原材料上涨和劳动成本提高都为生产L-异亮氨酸带来挑战。
发明内容
本发明的目的是针对目前L-异亮氨酸生产效率低下的现状，提供一种用于产L-异亮氨酸的谷氨酸棒杆菌发酵培养基及培养方法，采用该发酵培养基及培养方法，能大幅提高糖酸转化率，从而提高生产效率。
本发明提供的产L-异亮氨酸谷氨酸棒杆菌发酵培养基，包括基础培养基和生长因子，所述生长因子由胆碱、甜菜碱和维生素B6组成，各成分占发酵培养基的含量为胆碱0.2-1g/L，甜菜碱0.25-0.5mg/L，维生素B6 0.05-0.3mg/L。
优选地，所述基础培养基由以下成分组成，各成分占发酵培养基的含量为：玉米浆15-25ml/L，葡萄糖240-300g/L，尿素20-25g/L，磷酸氢二钾0.4-0.8g/L，硫酸镁0.6-0.8g/L， 维生素B1 0.2-0.4mg/L，硫酸亚铁0.015-0.03mg/L，玉米油1-5ml/L，丝肽粉2-4g/L，消泡剂30-50ml/L。
进一步优选地，各成分占发酵培养基的含量为：玉米浆15ml/L，葡萄糖240g/L，尿素25g/L，磷酸氢二钾0.4g/L，硫酸镁0.6g/L，维生素B1 0.3mg/L，硫酸亚铁0.015mg/L，玉米油1ml/L，甜菜碱0.3mg/L，丝肽粉3g/L，维生素B6 0.3mg/L，胆碱0.5g/L，消泡剂34ml/L。
本发明提供的产L-异亮氨酸谷氨酸棒杆菌发酵培养方法是：将产L-异亮氨酸谷氨酸棒杆菌接种到所述的发酵培养基中，菌液体积占发酵培养基体积的5-20％，氨水调节pH至6.5-7，溶氧控制在30-50％，发酵25-30h；然后将溶氧降低到15-25％，并向发酵液中流加50-80％葡萄糖溶液控制残糖为3-4％，继续发酵至60-70小时终止发酵，整个发酵过程的温度控制在29-33℃。
优选地发酵培养方法是：将产L-异亮氨酸谷氨酸棒杆菌接种到如权利要求1-3任何一项所述的发酵培养基中，菌液体积占发酵培养基体积的10％，氨水调节pH至6.8，溶氧控制在30％，发酵26h；然后将溶氧降低到20％，并向发酵液中流加80％葡萄糖溶液控制残糖为3.5％，继续发酵至70小时终止发酵，整个发酵过程的温度控制在31℃。
本发明的有益效果是：本发明通过向培养基中添加胆碱、甜菜碱、维生素B6三种生长因子，可以为谷氨酸棒杆菌提供生长因子、维持其细胞内外渗透压平衡、促进氨基酸的合成代谢，从而提高L-异亮氨酸的产量和糖酸转化率。本发明提供的培养基和培养方法具有生产效率高、生产周期短等有点。
具体实施方式
以下通过实施例对本发明进行详细地说明。
实施例1
一种产L-异亮氨酸谷氨酸棒杆菌(Corynebacterium glutamicum)发酵培养基，它由基础培养基和生长因子组成，各组分在发酵培养基中的含量为：
基础培养基：玉米浆15ml/L，葡萄糖240g/L，尿素25g/L，磷酸氢二钾0.4g/L，硫酸镁0.6g/L，维生素B1 0.3mg/L，硫酸亚铁0.015mg/L，玉米油1ml/L，丝肽粉3g/L，消泡剂34ml/L。
生长因子：甜菜碱0.3mg/L、胆碱0.5g/L，维生素B6 0.3mg/L。
混合后121℃灭菌25min。
液体种子培养基：一水葡萄糖17g/L，玉米浆10ml/L，尿素1g/L，无水硫酸镁0.5g/L， 磷酸氢二钾1g/L，丝肽粉0.1g/L，维生素B1 0.1mg/L，玉米油0.1g/100ml，碳酸钙2g/100ml；用NaOH调pH7.0，121℃灭菌20min。
将试管斜面上的产L-异亮氨酸谷氨酸棒杆菌，挑取一环，接种到种子培养中，往复式摇床31℃、105rpm培养24h得到种子培养基菌液。
谷氨酸棒杆菌发酵培养方法：将谷氨酸棒杆菌接种到上述发酵培养基中，菌液体积占发酵培养基体积的10％，氨水调节pH至6.8，溶氧控制在30％，发酵26h；然后将溶氧降低到20％，并向发酵液中流加重量含量为80％的葡萄糖溶液控制残糖为3.5％(重量含量)，继续发酵至70小时终止发酵，整个发酵过程的温度控制在31℃。
实施例2
一种产L-异亮氨酸谷氨酸棒杆菌发酵培养基，它由基础培养基和生长因子组成，各组分在发酵培养基中的含量为：
玉米浆15ml/L，葡萄糖300g/L，尿素20g/L，磷酸氢二钾0.4g/L，硫酸镁0.6g/L，维生素B1 0.4mg/L，硫酸亚铁0.03mg/L，玉米油5ml/L，丝肽粉2g/L，消泡剂50ml/L，胆碱0.8g/L，甜菜碱0.4mg/L，维生素B6 0.2mg/L。
谷氨酸棒杆菌发酵培养方法：将谷氨酸棒杆菌接种到发酵培养基中，菌液体积占发酵培养基体积的5％，氨水调节pH至6.5，溶氧控制在30％，发酵25h；然后将溶氧降低到15％，并向发酵液中流加80％葡萄糖溶液控制残糖为3％，继续发酵至60小时终止发酵，整个发酵过程的温度控制在33℃。
实施例3
一种产L-异亮氨酸谷氨酸棒杆菌发酵培养基，它由基础培养基和生长因子组成，各组分在发酵培养基中的含量为：
玉米浆25ml/L，葡萄糖240g/L，尿素25g/L，磷酸氢二钾0.8g/L，硫酸镁0.8g/L，维生素B1 0.2mg/L，硫酸亚铁0.015mg/L，玉米油1ml/L，丝肽粉4g/L，消泡剂30ml/L，胆碱0.3g/L，甜菜碱0.5mg/L，维生素B6 0.1mg/L。
谷氨酸棒杆菌发酵培养方法：将谷氨酸棒杆菌接种到发酵培养基中，菌液体积占发酵培养基体积的20％，氨水调节pH至7，溶氧控制在50％，发酵30h；然后将溶氧降低到25％，并向发酵液中流加50％葡萄糖溶液控制残糖为4％，继续发酵至70小时终止发酵，整个发酵过程的温度控制在29℃。
实施例4
一种产L-异亮氨酸谷氨酸棒杆菌发酵培养基，它由基础培养基和生长因子组成，各组分在发酵培养基中的含量为：
玉米浆20ml/L，葡萄糖260g/L，尿素23g/L，磷酸氢二钾0.6g/L，硫酸镁0.7g/L，维生素B1 0.3mg/L，硫酸亚铁0.02mg/L，玉米油3ml/L，丝肽粉3g/L，消泡剂40ml/L，胆碱0.6g/L，甜菜碱0.25mg/L，维生素B6 0.05mg/L。
谷氨酸棒杆菌发酵培养方法：将谷氨酸棒杆菌接种到发酵培养基中，菌液体积占发酵培养基体积的15％，氨水调节pH至6.7，溶氧控制在40％，发酵28h；然后将溶氧降低到18％，并向发酵液中流加70％葡萄糖溶液控制残糖为3.8％，继续发酵至64小时终止发酵，整个发酵过程的温度控制在30℃。
实施例5
一种产L-异亮氨酸谷氨酸棒杆菌发酵培养基，它由基础培养基和生长因子组成，各组分在发酵培养基中的含量为：
玉米浆16ml/L，葡萄糖280g/L，尿素21g/L，磷酸氢二钾0.5g/L，硫酸镁0.7g/L，维生素B1 0.3mg/L，硫酸亚铁0.02mg/L，玉米油2ml/L，丝肽粉3g/L，消泡剂40ml/L，胆碱0.4g/L，甜菜碱0.35mg/L，维生素B6 0.15mg/L。
谷氨酸棒杆菌发酵培养方法：将谷氨酸棒杆菌接种到发酵培养基中，菌液体积占发酵培养基体积的12％，氨水调节pH至6.8，溶氧控制在30％，发酵27h；然后将溶氧降低到20％，并向发酵液中流加80％葡萄糖溶液控制残糖为3.5％，继续发酵至70小时终止发酵，整个发酵过程的温度控制在32℃。
试验例
对比例1
玉米浆15ml/L，葡萄糖240g/L，尿素25g/L，磷酸氢二钾0.4g/L，硫酸镁0.6g/L，维生素B1 0.3mg/L，硫酸亚铁0.015mg/L，玉米油1ml/L，丝肽粉3g/L，消泡剂34ml/L。
发酵培养方法与实施例1相同。
对比例2
在对比例1的基础上增加甜菜碱0.3mg/L。发酵培养方法与实施例1相同。
对比例3
在对比例1的基础上增加胆碱0.5g/L。发酵培养方法与实施例1相同。
对比例4
在对比例1的基础上增加维生素B6 0.3mg/L。发酵培养方法与实施例1相同。
对发酵液中的L-异亮氨酸含量进行检测(检测方法参考唐涛，《氨基酸柱前衍生化的HPLC方法发展及应用》硕士论文，南京理工大学，2006.5)，计算L-异亮氨酸的产量，并根据培养基中的含糖量计算出糖酸转化率，结果见下表1。
表1实施例1-5的产物含量和糖酸转化率
  L-异亮氨酸含量(g/L) 糖酸转化率(％)
实施例1 46.7 21.4
实施例2 42.2 18.9
实施例3 41.5 19.2
实施例4 44.8 20.6
实施例5 44.5 21.7
对比例1 34.1 15.5
对比例2 38.7 17.9
对比例3 37.9 16.8
对比例4 40.8 17.6
从以上结果可以看出，向基础培养基中添加二种生长因子，能提高L-异亮氨酸含量和糖酸转化率，当同时添加时产量和转化率增加最为明显。
虽然以上描述了本发明的具体实施方式，但是本领域的技术人员应当理解，这些仅是举例说明，在不背离本发明的原理和实质的前提下，可以对这些实施方式做出多种变更或修改。因此，本发明的保护范围由所附权利要求书限定。

Claims (5)

  1. 一种产L-异亮氨酸谷氨酸棒杆菌发酵培养基，其特征在于：包括基础培养基和生长因子，所述生长因子由胆碱、甜菜碱和维生素B6组成，各成分占发酵培养基的含量为胆碱0.2-1.0g/L，甜菜碱0.25-0.5mg/L，维生素B6 0.05-0.3mg/L。
  2. 如权利要求1所述的产L-异亮氨酸谷氨酸棒杆菌发酵培养基，其特征在于：所述基础培养基含有以下成分，各成分占发酵培养基的含量为：玉米浆15-25ml/L，葡萄糖240-300g/L，尿素20-25g/L，磷酸氢二钾0.4-0.8g/L，硫酸镁0.6-0.8g/L，维生素B1 0.2-0.4mg/L，硫酸亚铁0.015-0.03mg/L，玉米油1-5ml/L，丝肽粉2-4g/L，消泡剂30-50ml/L；和/或，胆碱0.3-0.8g/L。
  3. 如权利要求2所述的产L-异亮氨酸谷氨酸棒杆菌发酵培养基，其特征在于：各成分占发酵培养基的含量为：玉米浆15ml/L，葡萄糖240g/L，尿素25g/L，磷酸氢二钾0.4g/L，硫酸镁0.6g/L，维生素B1 0.3mg/L，硫酸亚铁0.015mg/L，玉米油1ml/L，甜菜碱0.3mg/L，丝肽粉3g/L，维生素B6 0.3mg/L，胆碱0.5g/L，消泡剂34ml/L。
  4. 一种产L-异亮氨酸谷氨酸棒杆菌发酵培养方法，其特征在于：将产L-异亮氨酸谷氨酸棒杆菌接种到如权利要求1-3任何一项所述的发酵培养基中，菌液体积占发酵培养基体积的5-20％，氨水调节pH至6.5-7，溶氧控制在30-50％，发酵25-30h；然后将溶氧降低到15-25％，并向发酵液中流加50-80％葡萄糖溶液控制残糖为3-4％，继续发酵至60-70小时终止发酵，整个发酵过程的温度控制在29-33℃。
  5. 如权利要求4所述产L-异亮氨酸谷氨酸棒杆菌发酵培养方法，其特征在于：菌液体积占发酵培养基体积的10％，氨水调节pH至6.8，溶氧控制在30％，发酵26h；然后将溶氧降低到20％，并向发酵液中流加80％葡萄糖溶液控制残糖为3.5％，继续发酵至70小时终止发酵，整个发酵过程的温度控制在31℃。
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