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.
Department of Textile Engineering, University of Minho, 4800-058 Guimarães, Portugal.
Andrea
A
Zille
Patricia
P
Ramalho
Tzanko
T
Tzanov
Roy
R
Millward
Veronika
V
Aires
Maria Helena
MH
Cardoso
Maria Teresa
MT
Ramalho
Georg M
GM
Gübitz
Artur
A
Cavaco-Paulo
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