Biodegradation of tricresyl phosphate isomers by Brevibacillus brevis: Degradation pathway and metabolic mechanism.

Abstract:

:Tricresyl phosphates (TCPs), a typical sort of organophosphate flame retardants, has received extensive concerns due to its potential adverse effects. However, limited information is available on the efficient and safe removal methods of TCPs. In this regard, TCPs were tentatively biodegraded with Brevibacillus brevis. A probable degradation pathway was further proposed with the cellular reactions discussed in detail. Experiments showed that B. brevis at 2 g L-1 could degrade 1 mg L-1 tri-m-cresyl phosphate, tri-p-cresyl phosphate, and tri-o-cresyl phosphate by 82.91%, 93.91%, and 53.92%, respectively, within five days. In the process of biodegradation, B. brevis metabolism caused the release of Na+ and Cl- as well as the absorption of some nutrient ions including K+, PO43-, Mg2+, and SO42-; the presence of oxalic acid, citric acid, acetic acid, and malonic acid was also detected. Similar metabolic pathways were found among different TCPs isomers, but tri-o-cresyl phosphate induced more reactive oxygen species than the other two did. This work develops novel insights into the potential mechanisms of TCPs biodegradation by microorganisms.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Liu Y,Yin H,Wei K,Peng H,Lu G,Dang Z

doi

10.1016/j.chemosphere.2019.05.188

subject

Has Abstract

pub_date

2019-10-01 00:00:00

pages

195-203

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(19)31103-8

journal_volume

232

pub_type

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