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Biodecolorization of Azo Dye Acid Red B under High Salinity Condition

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Abstract

The study was conducted by a novel salt tolerant bacterium Gracilibacillus sp. GTY. The strain was identified on the basis of morphological and physio-biochemical characteristics, and 16S rDNA sequence analysis. Decolorization was performed by growing and resting cells, as well as by extracted azo reductase. Strain grown in the media containing 15% (w/v) of NaCl showed the best performance in decolorization. Decolorization was observed by the UV–visible absorbance spectra. The maximum absorption peak in the visible area decreased to a minimum level after 96 h of incubation. On the other hand, strain grown in very low, or high concentrations, of salt did not show good performance in decolorization; suggesting that salt concentrations in the surroundings control the production of azo reductase.

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Acknowledgments

We are grateful to the Chinese Ministry of Education for the financial support of this study. We also thank Professor Zhou Jiti for his scientific and technical advice and providing us the laboratory facility.

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Authors and Affiliations

  1. School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian, 116024, China

    M. Salah Uddin, Jiti Zhou, Yuanyuan Qu, Ping Wang & Li hong Zhao

  2. Department of Genetics and Breeding, University of Rajshahi, Rajshahi, 6205, Bangladesh

    M. Salah Uddin

  3. School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, China

    Jianbo Guo

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  1. M. Salah Uddin
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  2. Jiti Zhou
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  3. Yuanyuan Qu
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  4. Jianbo Guo
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  5. Ping Wang
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  6. Li hong Zhao
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Correspondence to M. Salah Uddin.

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Uddin, M.S., Zhou, J., Qu, Y. et al. Biodecolorization of Azo Dye Acid Red B under High Salinity Condition. Bull Environ Contam Toxicol 79, 440–444 (2007). https://doi.org/10.1007/s00128-007-9260-1

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  • DOI: https://doi.org/10.1007/s00128-007-9260-1

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