Characterization of a Thermophilic Lignocellulose-Degrading Microbial Consortium with High Extracellular Xylanase Activity

文献类型： 外文期刊

第一作者： Zhang, Dongdong

作者： Zhang, Dongdong;Zhang, Chunfang;Zhang, Dongdong;Wang, Yi;Zheng, Dan;Guo, Peng;Guo, Peng;Cui, Zongjun

作者机构：

关键词： Lignocellulose degradation; extracellular xylanase activity; thermophilic; alkaline condition; microbial consortium

期刊名称：JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY （ 影响因子：2.351； 五年影响因子：2.65 ）

ISSN： 1017-7825

年卷期： 2018 年 28 卷 2 期

页码：

收录情况： SCI

摘要： A microbial consortium, TMC7, was enriched for the degradation of natural lignocellulosic materials under high temperature. TMC7 degraded 79.7% of rice straw during 15 days of incubation at 65 degrees C. Extracellular xylanase was effectively secreted and hemicellulose was mainly degraded in the early stage (first 3 days), whereas primary decomposition of cellulose was observed as of day 3. The optimal temperature and initial pH for extracellular xylanase activity and lignocellulose degradation were 65 degrees C and between 7.0 and 9.0, respectively. Extracellular xylanase activity was maintained above 80% and 85% over a wide range of temperature (50-75 degrees C) and pH values (6.0-11.0), respectively. Clostridium likely had the largest contribution to lignocellulose conversion in TMC7 initially, and Geobacillus, Aeribacillus, and Thermoanaerobacterium might have also been involved in the later phase. These results demonstrate the potential practical application of TMC7 for lignocellulosic biomass utilization in the biotechnological industry under hot and alkaline conditions.

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