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Microbiology and Biotechnology Letters

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Microbiol. Biotechnol. Lett. 2006; 34(2): 174-179

Biphenyl의 Sphingobium yanoikuyae BK-10에 의한 분해 특성

Biodegradation of Biphenyl by Sphingbium yanoikuyae BK-10

Jung-Bok Lee , Dong-Geol Kim , Chung-Sig Choi , Ho-Yong Sohn , Jang-Eok Kim and Gi-Seok Kwon

The School of Bioresource Science, Andong National University, 1The School of Bioresource Science, Andong National University, 2HansBio Co., 3Dept. of Food and Nutrition, Andong National University, 4Dept. Argicultural Chemistry, Kyungpook National University, 5The School of Bioresource Science, Andong National University

Abstract

Bacterium capable of using biphenyl as a sole source of carbon and energy were isolated from soil, and based on the results of 16S rDNA sequence, strain BK10 identified as a Sphingobium yanoiktiyae. The optimum cultural conditions were as follows; $NH_4NO_3$ 1g, $K_2HPO_4$ 1g, $MgSO_4{cdot}7H_2O$ 0.5g, $CaCO_3$ 0.2 g per 1 liter of distilled water. The Sphingobium yanoikuyae BK10 strain was completely utilized biphenyl in mineral salt media containing biphenyl at concentration 500 $mu$g/ml of biphenyl as a sole carbon and energy source within 48 hours. Optimumal pH and temperature for biphenyl degradation and cell growth of strains were 6.0$sim$8.0 and 20$sim$50$^{circ}C$, respectively. Especially, at 30$^{circ}C$, cell-growth were higher than other temperature. Cell grown on biphenyl has been shown to have a higher removal rate for biphenyl than grown on sucrose. This study shows that Sphingobium yanoikuyae BK10 strain had a high biodegradation capability of biphenyl and can be simulate a candidate compounds the bioremediation of PCBs (Polychlorinated biphenyl) contaminant soil and water.

Keywords: Biphenyl, Sphingobium yanoikuyae BK10, PCBs (Polychlorinated Biphenyls), biodegradation

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