Degradation of a xenobiotic textile dye, Disperse Brown 118, by Brevibacillus laterosporus

Abstract

The toxic textile dye, Disperse Brown 118, was degraded by Brevibacillus laterosporus. 96 % decolorization was achieved within 48 h at pH 7, 40 °C at 50 mg dye l?1 accompanied by significant increases in the activities of veratryl alcohol oxidase, tyrosinase and NADH-DCIP reductase. HPTLC and FT-IR spectroscopy confirmed biodegradation after dye decolorization. As identified by GC?MS, biodegradation products of Disperse Brown 118 were N-carbamoyl-2-[(8-chloroquinazolin-4-yl)oxy] acetamide and N-carbamoyl-2-(quinazolin-4-yloxy)acetamide which were much less toxic than parent dye as evidenced by phytotoxicity tests.