Aerobic biotransformation of decabromodiphenyl ether (PBDE-209) by Pseudomonas aeruginosa

• Published in: Chemosphere (Oxford) 2013-11, Vol.93 (8), p.1487-1493
• Main Authors: Shi, Guangyu, Yin, Hua, Ye, Jinshao, Peng, Hui, Li, Jun, Luo, Chunling
• Format: Article
• Language: English
• Subjects: Aerobic biodegradation; Aerobiosis; beef extracts; biodegradation; Biodegradation of pollutants; Biological and medical sciences; Biotechnology; Biotransformation; bromine; cadmium; Cadmium ion; carbon; Environment and pollution; Environmental Pollutants - metabolism; ethers; Fundamental and applied biological sciences. Psychology; glucose; Halogenated Diphenyl Ethers - metabolism; heavy metals; Industrial applications and implications. Economical aspects; Intermediate product; lactose; PBDE-209; Pseudomonas aeruginosa; Pseudomonas aeruginosa - metabolism; starch; sucrose
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2013.07.044

•Certain amount of co-metabolic substrates promoted the biodegradation of PBDE-209.•Degradation was stimulated at low level of Cd2+ while inhibited at higher content.•Br− was produced during degradation of PBDE-209.•The lower brominated products of PBDE-209 transformation were presented.•The mechanism of PBDE-209 degradation by P. aeruginosa was put forward. Aerobic biodegradation of decabromodiphenyl ether (PBDE-209) by Pseudomonas aeruginosa under the influence of co-metabolic substrates and heavy metal cadmium ion was studied, The results showed that certain amount of co-metabolic substrates, such as glucose, sucrose, lactose, starch, and beef extract, would promote the biodegradation of PBDE-209, among which glucose most favorably accelerated PBDE-209 degradation by about 36% within 5d. The highest degradation efficiency was reached at the ratio of PBDE-209 and glucose 1:5 while excessive carbon source would actually hamper the degradation efficiency. Exploration of influences of cadmium ion on PBDE-209 biodegradation indicated that degradation efficiency was stimulated at low concentrations of Cd2+ (0.5–2mgL−1) while inhibited at higher levels (5–10mgL−1), inferring that the heavy metals of different concentrations possessed mixed reactions on PBDE-209 bioremoval. Bromine ion was produced during the biotransformation process and its concentration had a good negative correlation with the residues of PBDE-209. Two nonabromodiphenyl ethers (PBDE-208, PBDE-207), four octabromodiphenyl ethers (PBDE-203, PBDE-202, PBDE-197, PBDE-196) and one heptabromodiphenyl ethers (PBDE-183) were formed with the decomposition of PBDE-209, demonstrating that the main aerobic transformation mechanism of PBDE-209 was debromination.