Fractional pretreatment of hybrid poplar for accelerated enzymatic hydrolysis: Characterization of cellulose-enriched fraction

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• 作者：Ling Yan Meng^a ; Su Min Kang^a ; Xue Ming Zhang^a ; ^{xm_zhang@bjfu.edu.cn} ; Yu Ying Wu^a ; Feng Xu^a ; Run Cang Sun^a ; ^b ; ^{rcsun3@bjfu.edu.cn}
• 关键词：Hybrid poplar ; Cellulose ; CP/MAS 13C NMR ; Enzymatic hydrolysis
• 刊名：Bioresource Technology
• 出版年：2012
• 期刊代码：11_09608524
• 类别：ce
• 出版时间：April, 2012
• 卷：110
• 期：Complete
• 页码：308-313
• 文件大小：409 K

摘要

The efficient production of fermentable sugars is a prerequisite for economic ethanol production from lignocellulosic biomass. A cellulose-enriched fraction was obtained by complete dissolution of ball-milled hybrid poplar wood in dimethyl sulfoxide and lithium chloride (DMSO/LiCl). The cellulose-enriched fraction was mainly composed of glucose and xylose. Spectral fitting analysis of CP/MAS ¹³C NMR revealed that the cellulose-enriched fraction had para-crystalline structures with somewhat larger contents of crystalline cellulose 袉_尾 than 袉_伪. The cellulose-enriched fraction was much easier to be converted into mono sugars by cellulases than the untreated sample.

Scanning electron microscopy (SEM) indicated that the cellulose-enriched fraction was porous, which could likely explain the high enzymatic hydrolysis efficiency.

This study provides a novel pretreatment method based on fractional separation of the three biopolymers via complete dissolution system for enhancement of conversion from ignocellulose to biofuels.