食品科学

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基于pH值调控的高山被孢霉发酵生产花生四烯酸的补料工艺

郑志达,陈 璇,姜 悦*   

  1. 润科生物工程(福建)有限公司,福建 漳州 363500
  • 出版日期:2016-09-15 发布日期:2016-09-22

Arachidonic Acid Production by Mortierella alpina Fermentation Using Different Substrate-Feeding Strategies Based on pH Control

ZHENG Zhida, CHEN Xuan, JIANG Yue*   

  1. Runke Bioengineering (Fujian) Co. Ltd., Zhangzhou 363500, China
  • Online:2016-09-15 Published:2016-09-22

摘要:

为了提高高山被孢霉(Mortierella alpina)发酵生产花生四烯酸(arachidonic acid,ARA)的产量,研究pH值控制及不同底物流加方式对M. alpina产ARA的影响。在0~90 h菌体生长阶段pH值维持在6.0,90 h以后上调至6.5,并在此基础上考察了3 种补料方式(一次性补料、恒定葡萄糖速率补料和pH值反馈补料)对菌体生物量、油脂产量及ARA产量的影响。结果表明:发酵过程中pH 6.0时可以促进菌体的生长,而pH 6.5时有利于油脂的合成。与其他补料方式相比,pH值反馈补料不仅使发酵周期缩短至160 h,而且在该条件下得到ARA最大生产强度及产量,分别为1.32 g/(L·d)和8.82 g/L。

关键词: 高山被孢霉, 花生四烯酸, pH值反馈, 补料发酵

Abstract:

To increase the production of arachidonic acid (ARA)-rich oil, the effects of different pH and substrate feeding
strategies on the production of ARA by Mortierella alpina was studied. Three glucose-feeding strategies (one-time glucose
feeding, constant glucose feeding and pH feedback glucose feeding) in the fermentation process were designed and applied
to improve biomass, lipid yield and ARA content based on pH control. The results indicated that the growth of biomass was
promoted at pH 6.0 in the fermentation process, while the synthesis of fatty acids was benefited at pH 6.5. Compared with
two other feeding methods, the pH feedback method not only shortened the fermentation period to 160 h but also maximized
ARA productivity and yield to 1.32 g/(L·d) and 8.82 g/L, respectively.

Key words: Mortierella alpina, arachidonic acid, pH feedback, substrate feeding fermentation

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