Characterization of a Thermophilic Lignocellulose-Degrading Microbial Consortium with High Extracellular Xylanase Activity
文献类型： 外文期刊
作者： Zhang, Dongdong 1 ; Wang, Yi 2 ; Zhang, Chunfang 1 ; Zheng, Dan 2 ; Guo, Peng 2 ; Cui, Zongjun 4 ;
作者机构： 1.Zhejiang Univ, Ocean Coll, Inst Marine Biol, Zhoushan 316021, Peoples R China
2.Hubei Acad Agr Sci, Inst Agr Prod Proc & Nucl Agr Technol Res, Wuhan 430064, Hubei, Peoples R China
3.Minist Agr, Key Lab Fertilizat Agr Wastes, Wuhan 430064, Hubei, Peoples R China
4.China Agr Univ, Coll Agron & Biotechnol, Beijing 100193, Peoples R China
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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