Bacterial Degradation of Azo Dye Containing Wastes - Microbial Degradation of Synthetic Dyes in Wastewaters - page 75

Fig. 1 Bacterial degradation pathway of azo dye Acid Black 210

￿ Azo dyes may be toxic only after reduction and cleavage of the azo linkage,

producing aromatic amines.

Azo dyes, containing free aromatic amine groups that can be metabolically
oxidized without azo reduction, may cause toxicity.

￿

Induction in azo dye toxicity may occur following direct oxidation of the azo
linkage producing highly reactive electrophilic diazonium salts.

￿