Non-enzymatic reduction of quinone methides during oxidative coupling of monolignols: implications for the origin of benzyl structures in lignins
2006 (English)In: Organic and biomolecular chemistry, ISSN 1477-0520, E-ISSN 1477-0539, Vol. 4, no 18, 3456-3461 p.Article in journal (Refereed) Published
Lignin is believed to be synthesized by oxidative coupling of 4-hydroxyphenylpropanoids. In native lignin there are some types of reduced structures that cannot be explained solely by oxidative coupling. In the present work we showed via biomimetic model experiments that nicotinamide adenine dinucleotide ( NADH), in an uncatalyzed process, reduced a beta-aryl ether quinone methide to its benzyl derivative. A number of other biologically significant reductants, including the enzyme cellobiose dehydrogenase, failed to produce the reduced structures. Synthetic dehydrogenation polymers of coniferyl alcohol synthesized ( under oxidative conditions) in the presence of the reductant NADH produced the same kind of reduced structures as in the model experiment, demonstrating that oxidative and reductive processes can occur in the same environment, and that reduction of the in situ-generated quinone methides was sufficiently competitive with water addition. In situ reduction of beta - beta-quinone methides was not achieved in this study. The origin of racemic benzyl structures in lignins therefore remains unknown, but the potential for simple chemical reduction is demonstrated here.
Place, publisher, year, edition, pages
2006. Vol. 4, no 18, 3456-3461 p.
Benzene; Biomimetic materials; Catalysis; Enzymes; Lignin; Polymers; Reaction kinetics; Cellobiose dehydrogenase; Non-enzymatic reduction; Oxidative coupling; Quinone methides
IdentifiersURN: urn:nbn:se:kth:diva-7968DOI: 10.1039/b606369aISI: 000240166800014ScopusID: 2-s2.0-33748285226OAI: oai:DiVA.org:kth-7968DiVA: diva2:13161
QC 201008112008-02-112008-02-112010-08-11Bibliographically approved