期刊论文

Gu, Chen

Wang, J (reprint author), Dalian Univ Technol, Key Lab Ind Ecol & Environm Engn, Sch Environm Sci & Technol, Minist Educ, Dalian 116024, Peoples R China.

Wang, Jing,Guo, Mengfan,Sui, Meng,Lu, Hong,Liu, Guangfei

2018-10-01

WATER RESEARCH

PubMed、SCIE

J

142

354-362

0043-1354

Tetrabromobisphenol A; Cometabolism; Marine bacterium; Reactive oxygen species; Coastal pollution

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.