Biotechnology Bulletin ›› 2013, Vol. 0 ›› Issue (2): 184-189.

• Research report • Previous Articles     Next Articles

Identification of BSNK-5 and Optimization of the Fermentation Conditions

Li Shuying1 Nie Ying1 Du Huan1 Zhao Zhonglin2 Yuan Chao2 Li Yan3 Song Xiaoyan4 Tang Xuanming1   

  1. (1. Institute of Agro-products Processing Science and Technology,Chinese Academy of Agricultural Sciences,Beijing 100193 ;2. College of Sciences,Henan Agricultural University,Zhengzhou 450002 ;3. School of Food and Biological Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002 ;4. College of Food Science and Technology,Henan Agricultural University,Zhengzhou 450002)
  • Received:2012-09-29 Revised:2013-02-27 Online:2013-02-26 Published:2013-02-27
  • Contact: 唐选明,男,副研究员,研究方向:食品科学;E-mail :tangxuanming@caas.net.cn

Abstract: Nattokinase production bacteria BSNK-5 was preliminarily identified. The effects of liquid fermentation on nattokinase activity produced by BSNK-5 were studied in order to improve production yield. BSNK-5 is a Bacillus subtilis. Different carbon sources, nitrogen sources, pH, inoculate size;temperature, and time were optimized. Two optimum culture conditions were obtained. The nattokinase activity was 1 160 U/mL under the optimum culture conditions, which was 283% times of the former culture conditions.

Key words: Bacillus natto, Nattokinase, Liquid fermentation