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Decolorization of triphenylmethane and azo dyes by Citrobacter sp.

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Abstract

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 μM 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 °C. Decolorization of dyes was also observed with extracellular culture filtrate, indicating the color removal by enzymatic biodegradation.

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Authors and Affiliations

  1. Division of Biotechnology, College of Natural Resources and Life Science, Dong-A University, Busan, 604-714, Korea

    Sun-Young An, Yong-Lark Choi, Young-Su Cho & Young-Choon Lee

  2. Department of Microbiology, Busan Institute of Health and Environment, Busan, 613-104, Korea

    Sang-Ki Min & In-Ho Cha

  3. Department of Biochemistry and Molecular Biology, College of Oriental Medicine, Dongguk University, Kyung-Pook, 780-350, Korea

    Cherol-Ho Kim

Authors
  1. Sun-Young An
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  2. Sang-Ki Min
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  3. In-Ho Cha
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  4. Yong-Lark Choi
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  5. Young-Su Cho
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  6. Cherol-Ho Kim
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  7. Young-Choon Lee
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An, SY., Min, SK., Cha, IH. et al. Decolorization of triphenylmethane and azo dyes by Citrobacter sp.. Biotechnology Letters 24, 1037–1040 (2002). https://doi.org/10.1023/A:1015610018103

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  • DOI: https://doi.org/10.1023/A:1015610018103

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