食品科学

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等离子体诱变凝结芽孢杆菌提高木糖利用能力高产L-乳酸

蔡 聪1,2,姜 婷2,郑兆娟2,欧阳嘉1,2,*   

  1. 1.南京林业大学森林资源与环境学院,江苏 南京 210037;
    2.南京林业大学 江苏省生物质绿色燃料与化学品重点实验室,江苏 南京 210037
  • 出版日期:2014-01-15 发布日期:2014-01-22
  • 通讯作者: 欧阳嘉
  • 基金资助:

    国家自然科学基金项目(31200443);江苏省杰出青年基金项目(BK2012038);国家“863”计划项目(2012AA022301)

Improved Xylose Utilization of Bacillus coagulans by Atmospheric and Room Temperature Plasma Mutation for Production of Lactic Acid

CAI Cong1,2, JIANG Ting2, ZHENG Zhao-juan2, OUYANG Jia1,2,*   

  1. 1. College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037, China;
    2. Jiangsu Key Laboratory of Biomass-based Green Fuels and Chemicals, Nanjing Forestry University, Nanjing 210037, China
  • Online:2014-01-15 Published:2014-01-22
  • Contact: OUYANG Jia

摘要:

为进一步提高凝结芽孢杆菌发酵木糖生产L-乳酸的产量和转化率,以实验室保存的一株能利用木糖产L-乳酸的野生型凝结芽孢杆菌菌株NL01为出发菌株,通过等离子体诱变育种技术和平板菌落初筛、摇瓶复筛,最终得到一株木糖耐受力强、L-乳酸产量高、遗传特性稳定的正向突变菌株NL-CC-17。该突变菌株是目前已报道的木糖耐受力最高的菌株。当以100 g/L的木糖为底物,50 ℃发酵72 h后,L-乳酸产量达到82.30 g/L,糖酸转化率为92.37%,L-乳酸产量较出发菌株提高21.51%,糖酸转化率提高了16.00%。通过初步优化发酵条件,确定该菌株最佳发酵温度为50 ℃,实验范围内最佳发酵pH值为5.5。

关键词: 常温常压等离子体, 凝结芽孢杆菌, 诱变, L-乳酸, 木糖

Abstract:

To further enhance the production and yield of converting xylose to L-lactic acid, an atmospheric- and room
temperature-plasma (ARTP) mutation system was employed to induce the mutation of Bacillus coagulans NL01, a wild-type
strain for production of L-lactic acid from xylose. A positive mutant, named as NL-CC-17, was obtained through enrichment and
screening. Compared with that of previously reported strains, NL-CC-17 had an improved tolerance to xylose. This strain was
capable of converting 100 g/L xylose into 82.30 g/L L-lactic acid after being cultured at 50 ℃ for 72 h with a yield of 92.37%. The
concentration of L-lactic acid was increased by 21.51% and the yield by 16.00%. After preliminary optimization of fermentation
conditions, the optimal fermentation temperature was determined as 50 ℃ and the optimal pH as 5.5.

Key words: atmospheric and room temperature plasma (ARTP), Bacillus coagulans, mutation, L-lactic acid, xylose

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