Biodegradation of trichlorobiphenyls and their hydroxylated derivatives by Rhodococcus-strains.

Autor: Gorbunova TI; I.Ya. Postovskii Institute of Organic Synthesis, Ural Branch, Russian Academy of Sciences, Yekaterinburg 620990, Russia. Electronic address: gorbunova@ios.uran.ru., Egorova DO; Institute of Ecology and Genetics of Microorganisms, Ural Branch, Russian Academy of Sciences, Perm 614081, Russia., Pervova MG; I.Ya. Postovskii Institute of Organic Synthesis, Ural Branch, Russian Academy of Sciences, Yekaterinburg 620990, Russia., Kyrianova TD; Institute of Ecology and Genetics of Microorganisms, Ural Branch, Russian Academy of Sciences, Perm 614081, Russia., Demakov VA; Institute of Ecology and Genetics of Microorganisms, Ural Branch, Russian Academy of Sciences, Perm 614081, Russia., Saloutin VI; I.Ya. Postovskii Institute of Organic Synthesis, Ural Branch, Russian Academy of Sciences, Yekaterinburg 620990, Russia., Chupakhin ON; I.Ya. Postovskii Institute of Organic Synthesis, Ural Branch, Russian Academy of Sciences, Yekaterinburg 620990, Russia.
Jazyk: angličtina
Zdroj: Journal of hazardous materials [J Hazard Mater] 2021 May 05; Vol. 409, pp. 124471. Date of Electronic Publication: 2020 Nov 04.
DOI: 10.1016/j.jhazmat.2020.124471
Abstrakt: 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.
(Copyright © 2020. Published by Elsevier B.V.)
Databáze: MEDLINE
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