화학공학소재연구정보센터
Biotechnology Letters, Vol.24, No.12, 1037-1040, 2002
Decolorization of triphenylmethane and azo dyes by Citrobacter sp.
A Citrobacter sp., isolated from soil at an effluent treatment plant of a textile and dyeing industry, decolorized several recalcitrant dyes except Bromophenol Blue. More than 90% of Crystal Violet and Methyl Red at 100 muM were reduced within 1 h. Gentian Violet, Malachite Green and Brilliant Green lost over 80% of their colors in the same condition, but the percentage decolorization of Basic Fuchsin and Congo Red were less than the others, 66 and 26%, respectively. Decolorization of Congo Red was mainly due to adsorption to cells. Color removal was optimal at pH 7-9 and 35-40 degreesC. Decolorization of dyes was also observed with extracellular culture filtrate, indicating the color removal by enzymatic biodegradation.