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Type: Artigo de periódico
Title: Iron-binding catechols oxidating lignin and chlorolignin
Author: Parra, C
Rodriguez, J
Baeza, J
Freer, J
Duran, N
Abstract: Iron-chelating low-molecular-weight compounds or catecholate siderophores have been suggested to be involved in mood biodegradation. To help in understanding the mechanism involved in the enzyme-like activity of catecholate siderophores, the oxidative properties of 2,3-dihydroxybenzoic acid (DHBA) and 3,4-dihydroxyphenylacetic acid (DHPAA) chelated with iron were studied. The pH and catechol/Fe(III) ratios were optimized for o-dianisidine oxidation, obtaining a maximum at pH 7.0, in the absence of buffer, and a catechol/Fe(III) ratio of 1:2 to DHBA and 1:1 to DHPAA was found. Under these conditions, the catechols were able to reduce Fe(III) to Fe(II) acting like siderophore models. The Fe(PII) complex of DHBA and of DHPAA degraded dioxane-lignin in 60% after 2 h and 85% after 24 h, respectively. DHBA/Fe(III) oxidized the bleaching effluent (E1) in 80% in 5 min under the studied conditions. (C) 1998 Academic Press.
Subject: lignin
Country: EUA
Editor: Academic Press Inc Elsevier Science
Rights: fechado
Identifier DOI: 10.1006/bbrc.1998.9315
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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