Thermogravimetry study of xylanase- and laccase/mediator-treated eucalyptus pulp fibres

被引：9

作者：

Barneto, Agustin G. ^{[1
]}

Valls, Cristina ^{[2
]}

Ariza, Jose ^{[1
]}

Roncero, M. Blanca ^{[2
]}

机构：

[1] Univ Huelva, Dept Chem Engn, Huelva 21071, Spain

[2] Univ Politecn Cataluna, Text & Paper Engn Dept, E-08222 Terrassa, Spain

来源：

BIORESOURCE TECHNOLOGY | 2011年 / 102卷 / 19期

关键词：

Thermogravimetric analysis; Xylanase; Laccase; Eucalyptus pulps; KINETICS; FLAX; ACID; WOOD;

D O I：

10.1016/j.biortech.2011.07.061

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Thermogravimetric analyses (TGA) was applied to study the effects of enzymatic bleaching of eucalyptus pulp with xylanase and a laccase-mediator system. The thermal degradation profile of the pulps was sensitive to the enzymatic treatments. Xylanase treatment produced an ordered and clean microfibril, whereas laccase oxidized surface cellulose chains and increased the amorphous (paracrystalline) cellulose content. In this case, pulp viscosity decreased from 972 to 859 mL/g and apparent pulp crystallinity calculated from TGA data decreased almost 50%. Alkaline extraction was necessary to recover pulp crystallinity and to remove oxidized lignin in the laccase-treated samples. TGA data allowed differentiating and quantifying crystalline and amorphous cellulose. This thermogravimetric approach is a simple method in order to monitor superficial changes in cellulosic microfibrils. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：9033 / 9039

页数：7

共 31 条

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