Bioaccumulation of Synthetic Dyes by Candida tropicalis Growing in Sugarcane Bagasse Extract Medium

Bioaccumulation of synthetic dyes viz. Acid Blue 93, Direct Red 28 and Basic Violet 3 by the environmental yeast isolate, Candida tropicalis growing in aqueous extract of sugarcane bagasse medium was studied in a batch system as a function of initial pH and dye concentrations. The optimum pH value for bioaccumulation was found to be 3.0 for Acid Blue 93 and Direct Red 28 and 5.0 for Basic Violet 3. The increase in dye concentration decreased the specific growth rate and bioaccumulation properties of the yeast. Non competitive kinetic model was tested in order to determine the inhibitory effects of dyes on the specific growth rate of Candida tropicalis. Basic violet 3 was found to be more toxic than the other two dyes. The combined effects of sugarcane bagasse extract and initial dye concentrations on the specific growth rate and dye bioaccumulation efficiency of Candida tropicalis were investigated.