Microbe-Mediated Degradation of Synthetic Dyes in Wastewater - Microbial Degradation of Synthetic Dyes in Wastewaters - page 208

Fig. 2 Proposed pathway for
peroxidases-catalyzed
degradation of 4-
(4 ' sulfophenylazo)-2,6-
dimethylphenol by
Pyricularia aryzae
(Chivukula and Renganathan
1995 )

2.2.1 Anaerobic Conditions

N=N=R 2 )+2e − +2H + (R 1 - R 1 - NH NH R 2 (Hydrazo intermediate)

→ - -

R 2 )+2e − +2H + (R 1 - HN NH R 1 - NH 2 +R 2 - NH 2 (Reductive cleavage of

- - →

the azo bond)
The exact mechanism of azo dye reduction, whether occurring intracellularly or
extracellularly, is still a subject of investigation, as it is the role of biogenic

intracellular water-soluble electron carriers, such as avins. Reduced avins can act