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Biosorption and Bioreduction of Trivalent Aurum by Photosynthetic Bacteria Rhodobacter capsulatus

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Abstract

Biosorption has been shown to be an eco-friendly approach to remove heavy metal ions. In this study, the photosynthetic bacteria Rhodobacter capsulatus was screened and found to have strong ability to adsorb Au(III). The maximum specific uptake of living cells was over 92.43 mg HAuCl4/g dry weight of cell in the logarithmic phase. Biosorpion ability would be enhanced by an acidic environment. As the main cations, during biosorption the quantity of Mg2+ exchanged was more than Na+. Biosorbed Au(III) could be reduced by carotenoid and enzymes embedded and/or excreted by R. capsulatus, which might be the mechanism of photosynthtic bacteria metal tolerance.

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Acknowledgments

This work is part of the project (40571156) supported by National Natural Science Foundation of China. We are grateful to Professor Gangya Zhang from the Analysis and Testing Center of Institute of Soil Science, Chinese Academy of Sciences for kindly helping with measurements.

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Authors and Affiliations

  1. Laboratory of Biochemistry, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, Jiangsu, 210008, China

    Youzhi Feng, Yongchang Yu, Yiming Wang & Xiangui Lin

  2. Graduate School of the Chinese Academy of Sciences, Beijing, 100039, China

    Youzhi Feng, Yongchang Yu, Yiming Wang & Xiangui Lin

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  1. Youzhi Feng
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  2. Yongchang Yu
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  3. Yiming Wang
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  4. Xiangui Lin
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Correspondence to Xiangui Lin.

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Feng, Y., Yu, Y., Wang, Y. et al. Biosorption and Bioreduction of Trivalent Aurum by Photosynthetic Bacteria Rhodobacter capsulatus . Curr Microbiol 55, 402–408 (2007). https://doi.org/10.1007/s00284-007-9007-6

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  • DOI: https://doi.org/10.1007/s00284-007-9007-6

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