Haruhiko Yamaguchi, Kyoko Yoshino
Influence of Tannin-Copper Complexes as Preservatives for Wood on Mechanism of Decomposition by Brown-Rot Fungus
Fomitopsis palustris
Summary
The mechanism of preservation by chemically modified tannin and tannin-ammonia-copper agents was
examined. Wood decay by F. palustris was markedly suppressed by processing wood with agents made
by mixing chemically modified tannins with ammonia and cupric chloride. When wood powder was
treated with these agents, mycelial growth and generated protein increased to some extent. The preservative
effects of the chemically modified tannins (RMT and CMT) or compound agents composed of the
tannins and ammonia-copper were considered to be due to inhibition of the activities of xylanase, mannase
and Cx-cellulase. In the culture medium in which treated wood powder was brought in with these
agents, drop of pH by oxalic acid, which F. palustris produces, is not generated. The potency of the effect
was thought to be due to chelation of copper, an essential trace element for wood decay by F. palustris,
by the tannin, and/or neutralization or suppression of oxalic acid production by ammonia-copper.
Holzforschung, Walter de Gruyter
Print ISSN: 0018-3830
Volume: 55, 09/2001
Pages: 464 - 470
Show full article (external site)
Show all available items of this journal
Search
