Biodegradation of aryl-organophosphate flame retardants by Rhodococcus pyridinivorans YC-MTN: Performance, pathway and potential in environmental remediation

文献类型： 外文期刊

第一作者： Long, Yuan

作者： Long, Yuan;Wang, Junhuan;Nwe, May Thet;Zou, Xinyun;Wu, Wei;Yan, Yanchun;Wang, Junhuan

作者机构：

关键词： Organophosphate flame retardants; Triphenyl phosphate; Rhodococcus pyridinivorans; Biodegradation; Mineralization

期刊名称：INTERNATIONAL BIODETERIORATION & BIODEGRADATION （ 影响因子：4.8； 五年影响因子：5.0 ）

ISSN： 0964-8305

年卷期： 2024 年 190 卷

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收录情况： SCI

摘要： A strain capable of efficiently degrading aryl-organophosphate flame retardants (aryl-OPFRs) was isolated and identified as Rhodococcus pyridinivorans YC-MTN. The strain demonstrated high degradation efficiency within a wide range of pH (7.0-10.0), temperature (25-45 C), and salinity (0-2%). Strain YC-MTN effectively utilized aryl-OPFRs as the sole carbon source, facilitating their rapid degradation. The estimated half-lives for four arylOPFRs, namely triphenyl phosphate (TPhP), tricresyl phosphate (TCrP), 2-ethylhexyl diphenyl phosphate (EHDPP), and resorcinol bis (diphenyl phosphate) (RBDPP), were found to be 8.73, 10.82, 30.28, and 16.14 h, respectively. Additionally, half of the aryl-OPFRs underwent mineralization after 7 d of incubation. In particular, hydrolysis played a dominant role in the metabolism of TPhP, EHDPP, and RBDPP by strain YC-MTN, while P-O bond cleavage generally occurred in the presence of phenol as the leaving group. In addition to hydrolysis, methylation participated in the biotransformation of TCrP. Strain YC-MTN exhibited significant degradability towards TPhP at various concentrations ranging from 1 to 1000 mg L-1. The remediation of TPhP was simulated in both freshwater and seawater, and within a span of 5 d, strain YC-MTN completely degraded the exogenous TPhP. Strain YC-MTN holds potential as a viable microbial agent in the bioremediation of aryl-OPFRs contamination.

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