Modification phenomena of solid-state lignin caused by electron-abstracting oxidative systems

被引:10
作者
Barsberg, S [1 ]
机构
[1] Royal Vet & Agr Univ, Plant Fibre Lab, DK-2630 Taastrup, Denmark
关键词
electron transfer; laccase; lignin; mediator; oxidation; supramolecular chemistry;
D O I
10.1016/S0003-9861(02)00225-4
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Oxidative treatments of wood pulp lignin by one-electron-abstracting enzymatic or chemical systems result in modification phenomena which are not fully described in terms of those known from lignin model compound studies. The generation of, e.g., long-lived radicals necessitates nondestructive spectroscopic analysis of the lignin polymer for a proper characterization of these. The present work exposes a complexity of spectroscopic modification phenomena, which has not previously been realized. This is achieved by a laccase mediator system, where the mediator is an aromatic low-molecular-weight compound, which mediates the electron abstraction between the lignin and the enzyme laccase. It is demonstrated that the modification generated exhibits qualitatively different temporal phases. The mechanisms are partly explained in terms of Marcus electron transfer theory, and it is suggested that these may play a role in the in vivo synthesis and degradation of lignin. (C) 2002 Elsevier Science (USA). All rights reserved.
引用
收藏
页码:62 / 70
页数:9
相关论文
共 34 条
[1]   SEQUENTIAL TREATMENT OF MECHANICAL AND CHEMIMECHANICAL PULPS WITH LIGHT AND HEAT - A RAMAN-SPECTROSCOPIC STUDY [J].
AGARWAL, UP ;
ATALLA, RH ;
FORSSKAHL, I .
HOLZFORSCHUNG, 1995, 49 (04) :300-312
[2]   FADING CHARACTERISTICS OF IRRADIATED ALANINE PELLETS - THE IMPORTANCE OF PREIRRADATION CONDITIONING [J].
ARBER, JM ;
SHARPE, PHG .
APPLIED RADIATION AND ISOTOPES, 1993, 44 (1-2) :19-22
[3]   Kraft pulp bleaching and delignification by Trametes versicolor [J].
Archibald, FS ;
Bourbonnais, R ;
Jurasek, L ;
Paice, MG ;
Reid, ID .
JOURNAL OF BIOTECHNOLOGY, 1997, 53 (2-3) :215-236
[4]   Reduction potentials and kinetics of electron transfer reactions of phenylthiyl radicals: Comparisons with phenoxyl radicals [J].
Armstrong, DA ;
Sun, Q ;
Schuler, RH .
JOURNAL OF PHYSICAL CHEMISTRY, 1996, 100 (23) :9892-9899
[5]   Mechanistic aspects of β-bond-cleavage reactions of aromatic radical cations [J].
Baciocchi, E ;
Bietti, M ;
Lanzalunga, O .
ACCOUNTS OF CHEMICAL RESEARCH, 2000, 33 (04) :243-251
[6]   Nonequilibrium phenomena influencing the wetting behavior of plant fibers [J].
Barsberg, S ;
Thygesen, LG .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2001, 234 (01) :59-67
[7]   Spectroscopic properties of oxidation species generated in the lignin of wood fibers by a laccase catalyzed treatment: electronic hole state migration and stabilization in the lignin matrix [J].
Barsberg, S ;
Thygesen, LG .
BIOCHIMICA ET BIOPHYSICA ACTA-GENERAL SUBJECTS, 1999, 1472 (03) :625-642
[8]  
BARSBERG S, 2002, PROGR BIOTECHNOLOGY
[9]   Electrochemical analysis of the interactions of laccase mediators with lignin model compounds [J].
Bourbonnais, R ;
Leech, D ;
Paice, MG .
BIOCHIMICA ET BIOPHYSICA ACTA-GENERAL SUBJECTS, 1998, 1379 (03) :381-390
[10]   The kismet of residual lignins during LMS delignification of high-kappa kraft pulps [J].
Chakar, FS ;
Ragauskas, AJ .
HOLZFORSCHUNG, 2000, 54 (06) :647-653