title: Relationship between azo dye structure and rat hepatic azoreductase activity.
abstract: The rate of reduction was determined for a variety of azo dyes using the rat hepatic azoreductase enzyme system. In decreasing order, the rates of reduction for the azo dyes expressed as nmol of arylamine product formed/min/0.25 g of liver were amaranth (33.2), azosulfamide (32.5), orange G (12.4), 1,2-dimethyl-4-p-(carboxyphenylazo)-5-hydroxybenzene (CPA) (9.27), brilliant crystal scarlet (8.00), sulfachrysoidine (7.27), and Sudan I (1.03). A comparison of the partition coefficient with its rate of reduction indicated that the water-soluble azo dyes were reduced more rapidly than the lipid-soluble ones. Furthermore, higher rates of reduction were observed for those dyes containing electron-withdrawing groups on the aromatic rings.
mesh_terms: D000818:Animals; D001391:Azo Compounds / Q000378:metabolism*; D004396:Coloring Agents / Q000378:metabolism; D066298:In Vitro Techniques; D008099:Liver / Q000201:enzymology*; D008297:Male; D009247:NADH, NADPH Oxidoreductases / Q000378:metabolism*; D009601:Nitroreductases; D051381:Rats; D012995:Solubility; D013997:Time Factors
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D009247:NADH, NADPH Oxidoreductases; D009601:Nitroreductases; C021106:azoreductase