Degradation of a non-phenolic beta-O-4 substructure and of polymeric lignin model compounds by laccase of Coriolus versicolor in the presence of 1-hydroxybenzotriazole
1999
Kawai, S. | Asukai, M. | Ohya, N. | Okita, K. | Ito, T. | Ohashi, H.
A beta-O-4 lignin substructure model compound, 2-(2,6-dimethoxy-4-formylphenoxy)-1,3-dihydroxy-1- (4-ethoxy-3-methox-yphenyl)propane, was oxidized by Coriolus versicolor laccase in the presence of 1-hydroxybenzotriazole to form four products: 2,3-dihydroxy-1,(4-ethoxy-3-methoxyphenyl)propanone, 1-(4-ethoxy-3-methoxyphenyl)-3-hydroxypropanone, 4-ethoxy-3-methoxybenzoic acid, and 2,6-dimethoxy-p-benzoquinone. The results show that three types of the reactions, beta-ether cleavage, C alpha-C beta cleavage, and C alpha-oxidation are catalyzed by laccase-1-hydroxybenzotriazole couple. Furthermore, depolymerization of a polymeric guaiacyl lignin model compound prepared from [beta-14C] coniferyl alcohol was also caused by this system.
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