Journal of Microbiology

  • 제41권3호
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  • Pages.189-195
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  • 2003
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  • 1225-8873(pISSN)
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  • 1976-3794(eISSN)
한국미생물학회 (The Microbiological Society of Korea)
권호 표지

Influence of Transition-Metal Cofactors on the Reductive Dechlorination of Polychlorinated Biphenyls (PCBs)

  • Kwon, O-Seob (School of Environmental Science and Engineering, and Nakdong River Environmental Research Center, Inje University) ;
  • Kim, Young-Jin (School of Environmental Science and Engineering, and Nakdong River Environmental Research Center, Inje University) ;
  • Cho, Kyung-Je (School of Environmental Science and Engineering, and Nakdong River Environmental Research Center, Inje University) ;
  • Lee, Jin-Ae (School of Environmental Science and Engineering, and Nakdong River Environmental Research Center, Inje University) ;
  • Kim, Young-Eui (School of Environmental Science and Engineering, and Nakdong River Environmental Research Center, Inje University) ;
  • Hwang, In-Young (School of Environmental Science and Engineering, and Nakdong River Environmental Research Center, Inje University) ;
  • Kwon, Jae-Hyun (School of Environmental Science and Engineering, and Nakdong River Environmental Research Center, Inje University)
  • 발행 : 2003.09.01
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초록

To enhance the reductive dechlorination of polychlorinated biphenyls (PCBs) under anaerobic conditions, we examined the adjunctive effects of cobalt (Co) and nickel (Ni), which are the central metals of transition-metal cofactors of coenzyme F$\_$430/ and vitamin B$\_$12/, respectively, on the dechlorination of Aroclor 1248. After 32 weeks of incubation, the average numbers of chlorines per biphenyl in culture vials supplemented with 0.2, 0.5, and 1.0 mM of Co reduced from 3.88 to 3.39, 2.92, and 3.28, respectively. However, the numbers of chlorine after supplementing with Ni decreased from 3.88 to 3.43, regardless of the Ni concentrations. The observed congener distribution patterns of all vials with different conditions were similar to the pattern produced by the dechlorination process of H' after 21 weeks of incubation, and these patterns were unchanged up to week 32, except for vials supplemented with 0.5 and 1.0 mM of Co. In vials containing 0.5 mM of Co, meta-rich congeners, such as 25/ 25-,24/25-, and 25/23-chlorobiphenyls (CBPs), which were found as accumulated products of dechlorination in other conditions, were further dechlorinated, and 25/2-, 24/2-, and 2/2-CBPs were concomitantly increased after 32 weeks of incubation. In this case, the congener distribution was similar to the dechlorination pattern of process M. From these results, we suggested that the enrichment of cultures with Co might stimulate the growth of specific populations of meta-dechlorinators, and that populations might promote a change in the dechlorination process from H' to M, which is known to be less effective on the dechlorination of the more highly chlorinated congeners of PCBs.

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