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Indexed by:期刊论文

Date of Publication:2018-10-01

Journal:WATER RESEARCH

Included Journals:PubMed、SCIE

Volume:142

Page Number:354-362

ISSN No.:0043-1354

Key Words:Tetrabromobisphenol A; Cometabolism; Marine bacterium; Reactive oxygen species; Coastal pollution

Abstract:Tetrabromobisphenol A (TBBPA) has attracted considerable attention due to its ubiquitous presence in different environmental compartments worldwide. However, information on its aerobic biodegradability in coastal environments remains unknown. Here, the aerobic biodegradation of TBBPA using a Pseudoalteromonas species commonly found in the marine environment was investigated. We found that extracellular biogenic siderophore, superoxide anion radical (O-2(center dot-)), hydrogen peroxide (H2O2), and hydroxyl radical ((OH)-O-center dot) were involved in TBBPA degradation. Upregulation of genes (nqrA and lodA) encoding Na+-translocating NADH-quinone oxidoreductase and L-lysine-epsilon-oxidase supported the extracellular O-2(center dot-) and H2O2 production. The underlying mechanism of TBBPA biodegradation presumably involves both O-2(center dot-) reduction and (OH)-O-center dot-based advanced oxidation process (AOP). Furthermore, TBBPA intermediates of tribromobisphenol A, 4-isopropylene-2,6-dibromophenol, 4-(2-hydroxyisopropyl)-2,6-dibromophenol, 2,4,6-tribromophenol (TBP), 4-hydroxybenzoic acid, and 2-bromobenzoic acid were detected in the culture medium. Debromination and beta-scission pathways of TBBPA biodegradation were proposed. Additionally, membrane integrity assays revealed that the increase of intracellular catalase (CAT) activity and the extracellular polymeric substances (EPS) might account for the alleviation of oxidative damage. These findings could deepen understanding of the biodegradation mechanism of TBBPA and other related organic pollutants in coastal and artificial bioremediation systems. (C) 2018 Elsevier Ltd. All rights reserved.