化工进展

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一株耐NMMO纤维素酶菌株的筛选及发酵优化

夏东琴1,何玉财1,谭春伟2,龚 磊1,龚 婷1,严生虎1,张 跃1,王利群1   

  1. 1常州大学制药与生命科学学院生物工程研究室,江苏 常州 213164;2吉化集团公司研究试验厂,吉林 吉林 132021
  • 出版日期:2013-02-05 发布日期:2013-02-05

Isolation of a NMMO-tolerant cellulase-producing strain and optimization of corresponding fermentation conditions

XIA Dongqin1,HE Yucai1,TAN Chunwei2,GONG Lei1,GONG Ting1,YAN Shenghu1,ZHANG Yue1,WANG Liqun1   

  1. 1Laboratory of Biochemical Engineering,College of Pharmaceutical Engineering and Life Sciences,Changzhou University,Changzhou 213164,Jiangsu,China;2Research Experiment Factory of Jilin Chemical Group Corporation,Jilin 132021,Jilin,China
  • Online:2013-02-05 Published:2013-02-05

摘要: 在常规筛选方法的基础上,利用在富集培养基中加入10 g/L NMMO,从土壤中筛选获得一株耐NMMO的高活性纤维素酶菌株Galactomyces sp. CCZU11-1。经研究,最适产酶培养条件为:碳源为甘蔗渣(5 g/L),氮源为(NH4)2SO4(5 g/L),表面活性剂为Tween-80(8 g/L),培养温度为30 ℃,初始培养pH值为5.5。在此条件下菌株培养7天后,FPA及CMCase分别为13.5 IU/mL和24.6 IU/mL。在培养体系和反应体系中分别加入200 g/L NMMO,Galactomyces sp. CCZU11-1纤维素酶仍具有良好的活性,表明其具有较高的耐NMMO性能及应用前景。

关键词: 纤维素, 纤维素酶, Galactomyces sp. CCZU11-1, 筛选, 发酵优化

Abstract: Based on the conventional screening methods,a NMMO-tolerant cellulase-producing strain Galactomyces sp. CCZU11-1 with high cellulase activity has been isolated from soil samples using enrichment culture media containing 10 g/L NMMO. The optimal culture condition has been found,under which strain CCZU11-1 was cultured for 7 days,and the activity of FPA and CMCase was 13.5 IU/mL and 24.6 IU/mL respectively,while the carbon source was the bagasse (5 g/L),the nitrogen source was (NH4)2SO4 (5 g/L),the initial culture pH was 5.5,the culture temperature was 30 ℃ and the additive was surfactant Tween-80 (8 g/L). To add 200 g/L NMMO in the culture and reaction system respectively,the cellulase from this strain Galactomyces sp. CCZU11-1 still had good activity, indicating that it had high NMMO-tolerant ability and potential application.

Key words: cellulose, cellulase, Galactomyces sp. CCZU11-1, screening, fermentation optimization

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