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HOME > J. Microbiol > Volume 47(6); 2009 > Article
Research Support, Non-U.S. Gov't
Arsenite Oxidation by a Facultative Chemolithotrophic Bacterium SDB1 Isolated from Mine Tailing
Rovimar T. Lugtu 1, Sung-Chan Choi 2, Young-Sook Oh 1
Journal of Microbiology 2009;47(6):686-692.
DOI: https://doi.org/10.1007/s12275-009-0279-3
Published online: February 4, 2010
1Department of Environmental Engineering and Biotechnology, Myongji University, Yongin 449-728, Republic of Korea, 2Department of Environmental Sciences and Biotechnology, Hallym University, Chuncheon 200-702, Republic of Korea
Corresponding author:  Young-Sook Oh , Tel: 82-31-330-6691, 
Received: 13 September 2009   • Accepted: 9 November 2009
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Abstract

An arsenite (As[III])-oxidizing bacterium, SDB1, was isolated from mine tailing collected from the Sangdong mine area in Korea and showed chemolithotrophic growth on As[III] and CO2 as the respective electron and carbon sources. SDB1 is Gram-negative, rod-shaped, and belongs to the Sinorhizobium-Ensifer branch of α-Proteobacteria. Growth and As[III] oxidation was enhanced significantly by the presence of yeast extract (0.005%) in minimal salt medium containing 5 mM As[III]; decreasing the doubling time from 9.8 to 2.1 h and increasing the As[III] oxidation rate from 0.014 to 0.349 pmol As[III] oxidized cell-1 h-1. As[III] oxidation nearly stopped at pH around 4 and should be performed at pH 7~8 to be most effective. SDB1 was immobilized in calcium-alginate beads and the oxidation capacity was investigated. Specific As[III] oxidation rates obtained with SDB1 (10.1~33.7 mM As[III] oxidized g-1 dry cell h-1) were 10~16-times higher than those reported previously with a heterotrophic bacterial strain (Simeonova et al., 2005). The stability and reusability of immobilized SDB1 strongly suggested that the immobilized SDB1 cell system can make the As[III] oxidation process technically and economically feasible in practical applications.

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    Arsenite Oxidation by a Facultative Chemolithotrophic Bacterium SDB1 Isolated from Mine Tailing
    J. Microbiol. 2009;47(6):686-692.   Published online February 4, 2010
    DOI: https://doi.org/10.1007/s12275-009-0279-3
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