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林产化学与工业 ›› 2014, Vol. 34 ›› Issue (5): 127-132.doi: 10.3969/j.issn.0253-2417.2014.05.021

• 研究报告 • 上一篇    下一篇

米根霉无载体固定化发酵产L-乳酸

陈晓佩1,2, 张丽1,2, 顾夕梅1,2, 李鑫1,2, 勇强1,2, 余世袁1,2   

  1. 1. 南京林业大学 化学工程学院, 江苏 南京 210037;
    2. 江苏省生物质绿色燃料与 化学品重点实验室, 江苏 南京 210037
  • 收稿日期:2013-08-26 出版日期:2014-10-25 发布日期:2015-08-18
  • 作者简介:陈晓佩(1989-),女,江苏宿迁人,硕士生,从事木质纤维生物利用领域的研究工作
  • 基金资助:
    江苏省自然科学基金项目(BK20131426);国家自然科学基金资助项目(31000278);教育部高等学校博士学科点专项科研基金项目(20103204120009)

Production of L-Lactic Acid by Self-immobilized Rhizopus oryzae

CHEN Xiao-pei1,2, ZHANG Li1,2, GU Xi-mei1,2, LI Xin1,2, YONG Qiang1,2, YU Shi-yuan1,2   

  1. 1. College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China;
    2. Jiangsu Key Lab of Biomass-based Green Fuel & Chemicals, Nanjing 210037, China
  • Received:2013-08-26 Online:2014-10-25 Published:2015-08-18
  • Contact: 勇强,教授,博士生导师,从事生物质利用和生物转化研究;E-mail:swhx@njfu.edu.cn E-mail:swhx@njfu.edu.cn

摘要: 通过研究米根霉NLX-M-1利用葡萄糖无载体固定化发酵产L-乳酸的影响因素,获得米根霉利用木质纤维基葡萄糖进行无载体固定化发酵的最优条件。优化的米根霉无载体固定化产L-乳酸条件:初始葡萄糖质量浓度100 g/L,(NH42SO4质量浓度2 g/L,接种量2 %(体积分数),CaCO3 30 g/L,KH2PO4 0.1 g/L,MgSO4·7H2O 0.25 g/L,ZnSO4·7H2O 0.1 g/L。在优化条件下,以纯葡萄糖为碳源的米根霉发酵过程,形成平均直径1 mm的微球,L-乳酸产量为76.6 g/L, 转化率为81.6 %。以玉米秸秆酸爆渣酶解葡萄糖浓缩至60 g/L进行L-乳酸发酵,米根霉形成直径约1.2 mm的微球,L-乳酸产量为36.4 g/L,转化率为63.5 %。

关键词: 米根霉, 无载体固定化, L-乳酸, 玉米秸秆, 酶解葡萄糖

Abstract: The main factors affecting self-immobilization of Rhizopus oryzae NLX-M-1 for L-lactic acid production were studied in present study. The optimum fermentation conditions utilizing wood fiber-based glucose for R.oryzae self-immobilization were obtained. The optimal results were achieved as 100 g/L initial glucose, 2 g/L (NH4)2SO4, 2 %inoculum size (value fraction), 30 g/L CaCO3, 0.1 g/L KH2PO4, 0.25 g/L MgSO4·7H2O and 0.1 g/L ZnSO4·7H2O. Under this optimal condition, R.oryzae formed pellets with an average diameter of about 1 mm during the fermentation, the production of L-lactic acid was 76.6 g/L and the conversion rate was 81.6 %. R.oryzae in acid explosive residue hydrolyzate containing 60 g/L glucose became 1.2 mm pellets, and produced 36.4 g/L L-lactic acid with a conversion rate of 63.5 %.

Key words: Rhizopus oryzae, self-immobilize, L-lactic acid, corn stover, acid explosive residue

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