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林产化学与工业 ›› 2011, Vol. 31 ›› Issue (6): 78-82.

• 研究报告 • 上一篇    下一篇

树干毕赤酵母在水解液中的驯化及木糖发酵

赵晨, 方浩, 孔端男, 余世袁   

  1. 南京林业大学 林木遗传与生物技术省部共建教育部重点实验室, 江苏 南京 210037
  • 收稿日期:2011-02-28 修回日期:1900-01-01 出版日期:2011-12-30 发布日期:2011-12-30
  • 通讯作者: 余世袁,教授,博士生导师,研究方向为林产资源生物化学加工利用;E-mail:shiyuanyu.nfu@gmail.com。

Pichia stipitis Adaptation and Xylose Fermentation in Hydrolysate Solution

ZHAO Chen, FANG Hao, KONG Duan-nan, YU Shi-yuan   

  1. Key Laboratory of Forest Genetics & Biotechnology,Ministry of Education,Nanjing Forestry University, Nanjing 210037, China
  • Received:2011-02-28 Revised:1900-01-01 Online:2011-12-30 Published:2011-12-30

摘要: 通过在玉米秸秆蒸汽爆破水解液中的驯化,树干毕赤酵母(Pichia stipitis)能够在大量抑制物存在的情况下进行木糖发酵,且驯化后P. stipitis的木糖利用率为 94.1 %,乙醇得率为 82.1 %。在此基础上,对初始木糖质量浓度为30、45和 60 g/L 的水解液进行发酵,结果显示 45 g/L 初始木糖发酵的平均乙醇生成速率较高,且平均光密度(OD)增长速率较低。通过碳平衡计算和碳元素流向分析,51.6 g/L 木糖水解液经过 36 h 发酵,碳回收率为 89.7 %,并且有 48.5 % 的碳元素流向乙醇。

关键词: 树干毕赤酵母, 驯化, 木糖, 乙醇, 抑制物

Abstract: Through adapting in steam-exploded corn stalk hydrolysate, Pichia stipitis was capable of fermenting xylose to ethanol in presence of inhibitory components. The xylose consumption rate and the ethanol yield were 94.1% and 82.1%, respectively. Fermentation started at initial xylose concentrations of 30, 45 and 60 g/L. It was found that 45 g/L had a higher average ethanol productivity and a lower average biomass productivity. According to carbon balance and carbon metabolic effluence analysis, the carbon recovery was 89.7%, and 48.5% of carbon was converted to ethanol in the hydrolysate of 51.6 g/L xylose for 36 h.

Key words: Pichia stipitis, adaptation, xylose, ethanol, inhibitors

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