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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2004, Vol. 5 Issue (2): 149-156    DOI: 10.1631/jzus.2004.0149
Bioscience & Biotechnology     
Improved elastase production by Bacillus sp. EL31410 — further optimization and kinetics studies of culture medium for batch fermentation
HE Guo-qing, CHEN Qi-he, JU Xiao-jie, SHI Nai-dong
Department of Food Science and Nutrition, Zhejiang University, Hangzhou 310029, China
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Abstract  An efficient culture medium producing a bacterial elastase with high yields was developed further following preliminary studies by means of response surface method. Central composite design (CCD) and response surface methodology were applied to optimize the medium constituents. A central composite design was used to explain the combined effect of three medium constituents, viz, glucose, K2HPO4, MgSO4·7H2O. The strain produced more elastase in the completely optimized medium, as compared with the partially optimized medium. The fitted model of the second model, as per RSM, showed that glucose was 7.4 g/100 ml, casein 1.13 g/100 ml, corn steep flour 0.616 g/100 ml, K2HPO4 0.206 g/100 ml and MgSO4·7H2O 0.034 g/100 ml. The fermentation kinetics of these two culture media in the flask experiments were analyzed. It was found that the highest elastase productivity occurred at 54 hours. Higher glucose concentration had inhibitory effect on elastase production. At the same time, we observed that the glucose consumption rate was slow in the completely optimized medium, which can explain the lag period of the highest elastase production. Some metal ions and surfactant additives also affected elastase production and cell growth.

Key words： Elastase      Bacillus sp. EL31410      Culture medium optimization      Central composite design      Response surface methodology      Batch fermentation      Fermentation kinetics studies     
Received: 29 May 2002     
CLC:  Q939  
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JU Xiao-jie
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CHEN Qi-he
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HE Guo-qing, CHEN Qi-he, JU Xiao-jie, SHI Nai-dong. Improved elastase production by Bacillus sp. EL31410 — further optimization and kinetics studies of culture medium for batch fermentation. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2004, 5(2): 149-156.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2004.0149     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2004/V5/I2/149

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