Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4364983 | International Biodeterioration & Biodegradation | 2013 | 5 Pages |
Abstract
Gloeophyllum trabeum is a brown-rot fungus that may hold promise for use in biorefineries. In the present work, G. trabeum was grown on Pinus taeda wood chips under solid-state fermentation conditions to study the degradative mechanisms used by this fungus. Metabolite secretion, Fe3+-reducing activity and wood component losses were evaluated in the cultures. The average mass loss ranged from 4% to 7% (m/m) during the period of 1-4 weeks. Polyoses were degraded preferentially. Cellulases and xylanases were secreted, but no correlation between hydrolytic enzymes and wood polysaccharide losses was observed. No phenol-oxidizing enzyme activity was detected. Soluble oxalic acid was detected in trace quantities. The residual lignin content remained unchanged (28.5% m/m), but mass balance studies indicated that Pinus taeda wood chips were partially delignified. This delignification was not accompanied by the accumulation of water-soluble phenols with Fe3+-reducing activity. The data suggest that Fenton-based biodegradation of wood polysaccharides by G. trabeum may be independent of lignin degradation products with Fe3+-reducing activity.
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Authors
André Aguiar, Daniela Gavioli, André Ferraz,