Biodegradation of trichlorobiphenyls and their hydroxylated derivatives by Rhodococcus-strains

A possibility of using a complex approach is considered to explain features of biodestruction of polychlorinated biphenyls (PCBs), which are known to be persistent organic pollutants. The approach comprises the following main stages: (i) chemical modification of chloroarenes by hydroxylation and (ii...

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Bibliographic Details
Published in:Journal of hazardous materials 2021-05, Vol.409, p.124471-124471, Article 124471
Main Authors: Gorbunova, Tatyana I., Egorova, Darya O., Pervova, Marina G., Kyrianova, Tatyana D., Demakov, Vitalyi A., Saloutin, Victor I., Chupakhin, Oleg N.
Format: Article
Language:English
Subjects:
Biodegradation
Hydroxylated derivatives
Polychlorobiphenyls
Rhodococcus-strains
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Summary:A possibility of using a complex approach is considered to explain features of biodestruction of polychlorinated biphenyls (PCBs), which are known to be persistent organic pollutants. The approach comprises the following main stages: (i) chemical modification of chloroarenes by hydroxylation and (ii) bacterial degradation of the hydroxylated derivatives. This approach is applicable to individual trichlorobiphenyls (PCB 29, PCB 30) and to a widespread mixture Trikhlorbifenil (analog of Aroclor 1242 and Delor 103). As bacterial strain destructors, the Rhodococcus-strains (КТ112–7, СН628, P25) were used. It was established that the main metabolites of microbial biodegradation of both polychlorobiphenyls and their hydroxy derivatives are polychloro- and hydroxy(polychloro)benzoic acids, which allows an assumption to be made about possible further biodegradation of these compounds down to the products of the base exchange reaction in a cell: water, carbon dioxide and chlorine compounds. The study discusses the effect that the structure of PCBs congeners causes on the conversion by hydroxylation, on the biodegradation rate of both PCBs and their hydroxy derivatives, and on the metabolite formation levels. [Display omitted] •A complex approach to elimination of PCBs is considered.•The approach comprises the chemical and bacterial stages.•Formation of PCBs-OH from trichlorobiphenyls and commercial mixtures is discussed.•Rhodococcus-strains are capable strain destructors for the studied compounds.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2020.124471