Decolorization of diazo dye Direct Red 81 by a novel bacterial consortium |
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Authors: | Nishant Junnarkar D Srinivas Murty Nikhil S Bhatt Datta Madamwar |
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Institution: | (1) Biogas Research Centre and Post Graduate Department of Microbiology, Gujarat Vidyapith, Sadra 382 320 Dist. Gandhinagar, Gujarat, India;(2) Post Graduate Department of Biosciences, Sardar Patel University, Vallabh Vidyanagar, 388 120, Gujarat, India |
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Abstract: | Summary Samples collected from various effluent-contaminated soils in the vicinities of dyestuff manufacturing units of Ahmedabad, India, were studied for screening and isolation of organisms capable of decolorizing textile dyes. A novel bacterial consortium was selected on the basis of rapid decolorization of Direct Red 81 (DR 81), which was used as model dye. The bacterial consortium exhibited 90% decolorization ability within 35 h. Maximum rate of decolorization was observed when starch (0.6 g l−1) and casein (0.9 g l−1) were supplemented in the medium. Decolorization of DR 81 was monitored by high performance thin layer chromatography, which indicated that dye decolorization was due to its degradation into unidentified intermediates. The optimum dye-decolorizing activity of the culture was observed at pH 7.0 and incubation temperature of 37 °C. Maximum dye-decolorizing efficiency was observed at 200 mg l−1 concentration of DR 81. The bacterial consortium had an ability to decolorize nine other structurally different azo dyes. |
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Keywords: | Azo dyes bacterial consortium Direct Red 81 dye decolorization starch |
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