Structural Characteristics of Cellulose and Xylan during in vitro Fermentation by Pig Fecal Bacteria  

作　　者：Ling Meng ShiLin Cao XiaoJuan Ma LiHui Chen LiuLian Huang Fang Huang 

机构地区：[1]Guangzhou Haisum Energy Technology Co.,Ltd [2]College of Materials Engineering,Fujian Agricultural and Forestry University

出　　处：《Paper And Biomaterials》2016年第2期8-15,共8页造纸与生物质材料（英文）

基　　金：financial support provided by the National Natural Science Foundation of China(No.31270638)

摘　　要：In this study,cellulose and xylan were in vitro fermented by pig fecal bacteria.Rapid fermentation(40 h) and extended fermentation(eight weeks)were performed.The properties and ultra-structure changes of post-fermented solid residues were studied.In the end effluent,acetic acid,propionic acid,and butyric acid were observed to be the principal short-chain fatty acids(SCFAs) produced by anaerobic fermentation.Xylan was more accessible to bacteria than cellulose,leading to higher SCFA and lactic acid production.In addition,the crystalline structure of cellulose changed,leading to 16.3% and42.1% increases in crystallinity index for rapid and extended fermentation,respectively.Through this research,a systematic and advanced method to study the degradation chemistry of cellulose and xylan during fermentation was developed.In this study, cellulose and xylan were in vitro fermented by pig fecal bacteria. Rapid fermentation （40 h） and extended fermentation （ eight weeks） were performed. The properties and ultra-structure changes of post-fermented solid residues were studied. In the end effluent, acetic acid, propionic acid, and butyric acid were observed to be the principal short-chain fatty acids （SC- FAs） produced by anaerobic fermentation. Xylan was more accessible to bac- teria than cellulose, leading to higher SCFA and lactic acid production. In addition, the crystalline structure of cellulose changed, leading to 16. 3% and 42. 1% increases in crystallinity index for rapid and extended fermentation, re- spectively. Through this research, a systematic and advanced method to study the degradation chemistry of cellulose and xylan during fermentation was deve- loped.

关 键 词：CELLULOSE XYLAN pig fecal bacteria in vitro fermentation 

分 类 号：TQ920.1[轻工技术与工程—发酵工程]