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Effect of aqueous extracts from Ceriporiopsis subvermispora-biotreated wood on the decolorization of Azure B by Fenton-like reactions

Author:
Aguiar, André, Ferraz, André
Source:
International biodeterioration & biodegradation 2012 v.74 pp. 61-66
ISSN:
0964-8305
Subject:
Ceriporiopsis subvermispora, copper, decolorization, hydrogen peroxide, iron, phenols, white-rot fungi, wood, wood extractives
Abstract:
Aqueous extracts from wood biotreated with the white-rot fungus Ceriporiopsis subvermispora were evaluated for their Fe³⁺- and Cu²⁺-reducing activities and their anti- or prooxidant properties in Fenton-like reactions to decolorize the recalcitrant dye Azure B. The decolorization of Azure B was strongly inhibited in the presence of 10% (v/v) wood extracts. Only 0.1% (v/v)-diluted extracts provided some enhancement of the Azure B decolorization. The iron-containing reactions decolorized more Azure B and consumed substantially more H₂O₂ than the reactions containing copper. This study demonstrates that water-soluble wood phenols exert anti- or prooxidant effects that depend on their concentration in the reactions and on the type of cation, Fe³⁺ or Cu²⁺, used to convert H₂O₂ to OH radicals.
Agid:
874651