MnO2-Oxylate Complex: A Natural and Abiotic Ligninolytic System

Research output: Contribution to conferencePaper


This paper report for the first time efficient modification/degradation of in situ lignin by manganese metallocomplexes formed by the association of MnO2 accumulated as black deposits during wood decay and oxalic acid, produced by fungi or resulting from oxidative degradation of the cell wall components. The catalysts formed through interaction between MnIV and organic acid were shown to modifyeither chemical and physical properties of wood cell wall. In particular, lignin structural analysis by thioacidolysis has revealed a strong decrease in the lignin content of ..beta..-O-4 linked Guaiacyl and Syringyl structures, the former one being predominantly attacked. The system is however remarkably specific of aromatic compounds as no hemicellulose nor cellulose degradation could beevidenced in the conditions used here. The exact nature of the Mn complex(es) remains however to be determined, as well as the chemical reactions resulting in lignin structural modification.
Original languageAmerican English
Number of pages5
StatePublished - 1997
Event1997 9th International Symposium on Wood and Pulping Chemistry (ISWPC) - Montreal, Canada
Duration: 9 Jun 199712 Jun 1997


Conference1997 9th International Symposium on Wood and Pulping Chemistry (ISWPC)
CityMontreal, Canada

NREL Publication Number

  • NREL/CP-570-22100


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