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

Author:
Meng, Ling Yan, Kang, Su Min, Zhang, Xue Ming, Wu, Yu Ying, Xu, Feng, Sun, Run Cang
Source:
Bioresource technology 2012 v.110 pp. 308-313
ISSN:
0960-8524
Subject:
biomass, biopolymers, cellulases, cellulose, dimethyl sulfoxide, enzymatic hydrolysis, ethanol production, glucose, hybrids, lithium chloride, new methods, nuclear magnetic resonance spectroscopy, scanning electron microscopy, spectral analysis, wood, xylose
Abstract:
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 Іᵦ than Іα. 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.
Agid:
493075