食品科学 ›› 2007, Vol. 28 ›› Issue (4): 227-231.

• 生物工程 • 上一篇    下一篇

一株高产纳豆激酶菌株的筛选及其发酵条件的优化

 余功保, 郭爱玲, 秦巧玲, 吕均, 王震   

  1. 华中农业大学食品科技学院; 华中农业大学食品科技学院 湖北 武汉 430070; 湖北 武汉 430070;
  • 出版日期:2007-04-15 发布日期:2011-12-31

Screening of High Nattokinase Activity Producing Strain and Optimization of Fermentation Conditions

 YU  Gong-Bao, GUO  Ai-Ling, QIN  Qiao-Ling, 吕Jun , WANG  Zhen   

  1. College of Food Science and Technology,Huazhong Agricultural University,Wuhan 430070,China
  • Online:2007-04-15 Published:2011-12-31

摘要: 通过紫外诱变、纤维蛋白原平板初筛、复筛得到了一株高产纳豆激酶的纳豆芽孢杆菌菌株。研究液体发酵产纳豆激酶的最佳条件,结果表明最佳培养基为营养肉汤,最佳培养时间为24h,最佳培养温度30℃。在优化条件下,发酵液酶活达640U/ml。该菌株的酶活比原始菌株酶活提高了258%。

关键词: 纳豆激酶, 紫外诱变, 优化, 纳豆芽孢杆菌

Abstract: A strain with high nattokinase activity was screened through the UV-induced mutation and fibrinogen plate and shake- flask liquid fermentation.The optimization of NK liquid fermentation was studied in this paper.The results showed that the optimal fermentation medium is nutrition meat broth,the optimal fermentation time 24 h,and fermentation temperature 30℃.With this optimization,the enzyme activity of the screened strain can reach 640 U/ml.Its enzyme activity is increased 258%.

Key words: nattokinase, UV-induced mutation, optimization, Bacillus subtilis(natto)