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Lignin repolymerisation in spruce autohydrolysis pretreatment increases cellulase deactivation

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2015
Author Thomas Pielhop, Gastón O. Larrazábal, Michael H. Studer, Simone Brethauer, Christoph-M. Seidel, Philipp Rudolf von Rohr,
Project Use of scavengers in the pretreatment of lignocellulosic biomass for improved chemicals production
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Original article (peer-reviewed)

Journal Green Chemistry
Volume (Issue) 17(6)
Page(s) 3521 - 3532
Title of proceedings Green Chemistry
DOI 10.1039/C4GC02381A

Open Access

URL http://pubs.rsc.org/en/Content/ArticleLanding/2015/GC/c4gc02381a#divAbstract
Type of Open Access Publisher (Gold Open Access)

Abstract

This study presents a modified autohydrolysis pretreatment which helps to overcome the recalcitrance of softwood for enzymatic hydrolysis of its cellulose. Autohydrolysis pretreatments of spruce wood were performed with 2-naphthol, which prevents lignin repolymerisation reactions, thereby increasing the enzymatic digestibility of cellulose by up to 64%. The negative influence of repolymerised lignin structures on enzymatic hydrolysis was confirmed by the addition of resorcinol in autohydrolysis, which is known to promote repolymerisation reactions and decreased the biomass digestibility. Several analyses were performed to study the underlying mechanism of this effect on hydrolysis, indicating that cellulolytic enzymes are adsorbed and deactivated especially by repolymerised lignin structures, which accounts for the high differences in biomass digestibility. It was shown that lignin repolymerisation significantly increases its specific surface area through modification of the lignin nanostructure, which is supposed to increase the unproductive binding of enzymes.
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