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Predicting Dye Biodegradation from Redox Potentials
Author(s) -
Zille Andrea,
Ramalho Patricia,
Tzanov Tzanko,
Millward Roy,
Aires Veronika,
Cardoso Maria Helena,
Ramalho Maria Teresa,
Gübitz Georg M.,
CavacoPaulo Artur
Publication year - 2004
Publication title -
biotechnology progress
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.572
H-Index - 129
eISSN - 1520-6033
pISSN - 8756-7938
DOI - 10.1021/bp049963i
Subject(s) - redox , chemistry , biodegradation , yeast , laccase , cofactor , enzyme , biocatalysis , photochemistry , combinatorial chemistry , organic chemistry , biochemistry , catalysis , reaction mechanism
Two biological approaches for decolorization of azo sulfonated dyes have been compared: reductive decolorization with the ascomycete yeast Issatchenkia occidentalis and enzymatic oxidative decolorization with Trametes villosa laccase alone or in the presence of the mediator 1‐hydroxybenzotriazole. The redox potential difference between the biological cofactor involved in the reductive activity of growing cells and the azo dye is a reliable indication for the decolorization ability of the biocatalyst. A linear relationship exists between the redox potential of the azo dyes and the decolorization efficiency of enzyme, enzyme/mediator, and yeast. The less positive the anodic peak of the dye, the more easily it is degraded oxidatevely with laccase. The more positive the cathodic peak of the dye, the more rapidly the dye molecule is reduced with yeast.