Reactions of lignin with cyanamide activated hydrogen peroxide Part 1. The degradation of lignin model compounds

被引：13

作者：

Kadla, JF ^{[1
]}

Chang, PM ^{[1
]}

Chen, CL ^{[1
]}

Gratzl, JS ^{[1
]}

机构：

[1] N Carolina State Univ, Dept Wood & Paper Sci, Raleigh, NC 27695 USA

来源：

HOLZFORSCHUNG | 1998年 / 52卷 / 05期

关键词：

hydrogen peroxide; cyanamide; peroxyimidic acid; superoxide anion radical; lignin model compound;

D O I：

10.1515/hfsg.1998.52.5.506

中图分类号：

S7 [林业];

学科分类号：

0829 ; 0907 ;

摘要：

Monomeric lignin model compounds representing various functional groups found in residual lignins were reacted with cyanamide activated hydrogen peroxide. Non-phenolic lignin model compounds failed to react even under extreme reaction conditions (90 degrees C), while phenolic lignin model compounds underwent rapid oxidation. Reaction optimization studies reveal that these reactions are strongly dependent on pH and the cyanamide-to-peroxide ratio, while temperature is not a factor. Through the use of electron paramagnetic resonance (EPR) spectroscopy free radical involvement has been demonstrated. Ln contrast to previous literature, a predominately free-radical mechanism exists, and on the basis of the reactions carried out in the presence of superoxide dismutase, the presence of . O-2(-) has been determined.

引用

页码：506 / 512

页数：7

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