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Hexavalent chromate reduction by immobilized Streptomyces griseus

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Abstract

Hexavalent chromium, which is a mutagen and carcinogen, was efficiently reduced by Streptomyces griseus. This activity was associated with the cell. Cr6+ reduction by free as well as immobilized cells was studied: cells in PVA-alginate had the highest (100%) Cr6+ removal efficiency in 24 h with reduction rates similar to free cells. Immobilized cells completely reduced 25 mg Cr6+ l−1 in 24 h. PVA-alginate immobilized cells could be reused four times to completely reduce 25 mg Cr6+ l−1 in 24 h each time. Chromate in a simulated effluent containing Cu2+, Mg2+, Mn2+ and Zn2+ was completely reduced by PVA-alginate immobilized cells within 9 h.

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Acknowledgements

Ashwini C. Poopal is grateful to the Council of Scientific and Industrial Research (CSIR) for the CSIR-JRF Fellowship. The authors thank Director, National Chemical Laboratory for the facilities provided for this research.

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Authors and Affiliations

  1. Division of Biochemical Sciences, National Chemical Laboratory, Pune, 411008, India

    Ashwini C. Poopal & R. Seeta Laxman

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  1. Ashwini C. Poopal
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  2. R. Seeta Laxman
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Correspondence to R. Seeta Laxman.

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Poopal, A.C., Laxman, R.S. Hexavalent chromate reduction by immobilized Streptomyces griseus . Biotechnol Lett 30, 1005–1010 (2008). https://doi.org/10.1007/s10529-008-9662-0

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  • DOI: https://doi.org/10.1007/s10529-008-9662-0

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