Biodegradability of hydroxylated derivatives of commercial polychlorobiphenyls mixtures by Rhodococcus-strains

[Display omitted] •The interactions of HO-PCBs mixtures with the Rhodococcus strains were studied.•The HO-PCBs mixtures cause a toxic effect on the growth of Rhodococcus strains.•The bacterial strains can use HO-PCBs as a source of carbon.•The metabolites of the destruction of HO-PCBs by Rhodococcus...

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Veröffentlicht in:Journal of hazardous materials 2020-12, Vol.400, p.123328, Article 123328
Hauptverfasser: Egorova, Darya O., Gorbunova, Tatyana I., Pervova, Marina G., Kir’yanova, Tatyana D., Demakov, Vitalyi A., Saloutin, Viсtor I., Chupakhin, Oleg N.
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Sprache:eng
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Zusammenfassung:[Display omitted] •The interactions of HO-PCBs mixtures with the Rhodococcus strains were studied.•The HO-PCBs mixtures cause a toxic effect on the growth of Rhodococcus strains.•The bacterial strains can use HO-PCBs as a source of carbon.•The metabolites of the destruction of HO-PCBs by Rhodococcus-strain are biodegradable.•The studied strains are effective for remediation of PCB-contaminated areas. For the first time, investigations are is carried out for the interactions of hydroxylated polychlorobiphenyls (HO-PCBs) mixtures, which were obtained from PCBs commercially available under the trade name Sovol, with the Rhodococcus (R.) strains. It is established that the HO-PCBs mixtures containing basic products within the range of 83.2–95.8% cause a toxic effect on the growth of R. wratislaviensis KT112-7, R. wratislaviensis CH628, R. ruber P25 strains. The inhibitory concentration (IC50) was varied within the range of 30–490 mg/l. For the first time, it is found that the bacterial strains can use HO-PCBs as a source of carbon with no co-substrate added. The strains are shown to degrade 95.5–100% of the HO-PCBs mixtures at a concentration of 0.1 g/l during 14 days. It is demonstrated that HO-PCBs degrading occurs following the classical bacterial pathway of transforming biphenyl/PCB. However, the HO-PCBs metabolites, which are substituted benzoic acids, are not the final products of the transformation and are subjected to further degrading by the strains. Therefore, the R. wratislaviensis KT112-7, R. wratislaviensis CH628, and R. ruber P25 strains are shown to degrade the HO-PCBs mixtures efficiently and are found to be stable to their toxic action.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2020.123328