食品科学 ›› 2009, Vol. 30 ›› Issue (21 ): 210-213.doi: 10.7506/spkx1002-6300-200921049

• 生物工程 • 上一篇    下一篇

高产食用蛋白质产朊假丝酵母菌的选育及发酵条件优化

何东东,张坤生*   

  1. 天津市食品生物技术重点实验室,天津商业大学食品科学与工程系
  • 收稿日期:2009-07-21 出版日期:2009-11-01 发布日期:2010-12-29
  • 通讯作者: 张坤生 E-mail:zhksheng@tjcu.edu.cn
  • 基金资助:

    天津市科技支撑计划重点项目(08ZCKFNC00800)

Screening and Breeding of An Edible High-yield Protein-producing Strain of Candida utilis and Optimization of Its Fermentation Conditions

HE Dong-dong,ZHANG Kun-sheng*   

  1. Tianjin Key Laboratory of Food Biotechnology, Department of Food Science and Engineering, Tianjin University of Commerce,
    Tianjin 300134, China
  • Received:2009-07-21 Online:2009-11-01 Published:2010-12-29
  • Contact: ZHANG Kun-sheng E-mail:zhksheng@tjcu.edu.cn

摘要:

通过对产朊假丝酵母菌的紫外诱变,筛选蛋白质含量较高的可食用菌株。结果表明:在15W紫外线(30cm)处,照射120s,致死率为89%,得到蛋白质含量为33% 的诱变菌株,比诱变前的22.9% 提高了37.12%。对此菌种进行稳定性测试(传代10 次并进行蛋白质测定),性质稳定;对诱变后的发酵条件:碳源、氮源、培养温度和溶氧量(培养箱转速)进行优化,最终得到采用葡萄糖为碳源、硫酸铵和酵母浸膏粉的混合物为氮源、培养温度为32℃、转速为160r/min 时培养出的蛋白质含量及菌体生物量都在较高水平,蛋白质含量为37%。

关键词: 紫外诱变, 发酵, 优化

Abstract:

This study aimed to screen and breed an edible strain of Candida utilis exhibiting high protein content via UV mutagenesis. Results showed that the exposure to 15 W UV light (at a distance of 30 cm) for 120 s led to a lethal rate of up to 89% and a new mutant strain B2 was obtained with a high protein content of 33%, which was higher than before mutagenesis (22.9%) by 37.12%. Analysis on protein content showed high genetic stability of this mutant strain after 10 passagings. The optimal B2 fermentation, which resulted in high protein content in mycelia (37%) and biomass of Candida utilis was achieved through culture at 32 ℃ with a shaking speed of 160 r/min using glucose as carbon source and (NH4)2SO4 and yeast extract powder as nitrogen sources.

Key words: UV mutagenesis, fermentation, optimization

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