NDLI: Congener Selectivity During Polychlorinated Biphenyls Degradation by Enterobacter sp. LY402

Content Provider	Springer Nature Link
Author	Xu, Li Xu, Jin Jing Jia, Ling Yun Liu, Wen Bin Jian, Xie
Copyright Year	2010
Abstract	The relationship between the selectivity of a particular polychlorinated biphenyls (PCBs) congener and its biodegradability under the same concentration, especially by Enterobacter sp. LY402, is less well studied. To measure congener selectivity of Enterobacter sp. LY402, several influencing factors were studied. The results showed LY402 effectively degraded coplanar 3,4,3′,4′-chlorobiphenyl (CB) at a concentration of 0.05 μM, but not 0.5 μM. The degradation rates of 2,4,5,2′,3′-CB and 2,4,5,2′,4′,5′-CB were increased significantly when the sample constituents were changed from 12 to 5 congeners or to one congener. This indicated that bioremediation of individual congener was affected by other congeners present in the mixture. Moreover, for PCBs containing one chlorine on each phenyl ring, the reactivity preference of LY402 was 2,2′-CB ≥ 3,3′-CB ≫ 4,4′-CB. For two ortho chlorines congeners of PCBs, 2,2′-CB was degraded faster than 2,6-CB. Although 2,6-CB and 4,4′-CB were poorly degraded, the addition of one (i.e., 2,4,4′-CB and 2,6,3′-CB) or two more chlorines (i.e., 2,4,2′,4′-CB) on the phenyl ring significantly increased their biodegradability. In addition, comparing the two congeners of ortho-meta-chlorinated biphenyl, 2,3,2′,3′-CB with neighbor meta chlorines was degraded slower than 2,5,2′,5′-CB with interval meta chlorines. All these indicated that the transformation rates of PCBs were not consistent with the number of chlorines, and PCBs containing the same numbers of chlorines but at different positions also resulted in different conversions. In principle, the extents of effect caused by the position of chlorine substituents on the degradation of PCBs by LY402 were ortho- > meta- > para-CB. In conclusion, the congener selectivity of LY402 was determined by many factors, including the composition of the congeners, their concentrations in the mixture and location and number of chlorine substituents on the phenyl rings.
Starting Page	784
Ending Page	789
Page Count	6
File Format	PDF
ISSN	03438651
Journal	Current Microbiology
Volume Number	62
Issue Number	3
e-ISSN	14320991
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-10-24
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biotechnology Microbiology
Content Type	Text
Resource Type	Article
Subject	Medicine Microbiology Applied Microbiology and Biotechnology

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