Predicting dye biodegradation from redox potentials.
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 oxidatively with laccase. The more positive the cathodic peak of the dye, the more rapidly the dye molecule is reduced with yeast.
Zille
Andrea
A
Department of Textile Engineering, University of Minho, 4800-058 Guimarães, Portugal.
Ramalho
Patricia
P
Tzanov
Tzanko
T
Millward
Roy
R
Aires
Veronika
V
Cardoso
Maria Helena
MH
Ramalho
Maria Teresa
MT
Gübitz
Georg M
GM
Cavaco-Paulo
Artur
A
D000465:Algorithms; D001391:Azo Compounds / Q000737:chemistry* / Q000378:metabolism*; D001487:Basidiomycota / Q000201:enzymology; D001673:Biodegradation, Environmental; D003116:Color; D004396:Coloring Agents / Q000737:chemistry* / Q000378:metabolism*; D004563:Electrochemistry / Q000379:methods*; D042845:Laccase / Q000737:chemistry*; D010084:Oxidation-Reduction; D004718:Saccharomycetales / Q000378:metabolism*; D013045:Species Specificity
D001391:Azo Compounds; D004396:Coloring Agents; D042845:Laccase