Total biodegradation of 4-chlorobiphenyl (4 CB) by a two-membered bacterial culture |
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Authors: | Michel Sylvestre Robert Massé Christianne Ayotte François Messier Johanne Fauteux |
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Institution: | (1) Centre de Recherche en Bactériologie, Institut Armand-Frappier, Université du Québec, H7V 1B7 Laval, Québec, Canada;(2) Institut National de la Recherche Scientifique, INRS (Santé), Université du Québec, H1N 3M5 Montréal, Quebec, Canada |
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Abstract: | Summary Several bacterial strains that can oxidize mono- and dichlorinated biphenyls with one unsubstituted ring have already been described. The major route for this biodegradation leads ultimately to the corresponding chlorobenzoic acid, but several other minor chlorinated metabolites that might possibly be of concern for the environment have also been described previously. Since none of the bacterial strains that are able to oxidize these chlorinated biphenyls in pure culture are known to degrade chlorobenzoic acid, the oxidation of these substrates by axenic cultures always generates chlorobenzoates plus several other metabolites. In the present study, we have estimated the biodegradation of 4-chlorobiphenyl (4CB) by a two-membered bacterial culture containing one strain able to grow on 4CB and to transform it into 4-chlorobenzoate (4CBA) and one strain able to degrade 4CBA. The results were encouraging, since it was shown that the degradation of 4CB was more rapid and complete with the double bacterial culture. |
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