Aerobic biotransformation of decabromodiphenyl ether (PBDE-209) by Pseudomonas aeruginosa.
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 Cd(2+) (0.5-2 mg L(-1)) while inhibited at higher levels (5-10 mg L(-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.
State Key Laboratory of Organic Geochemistry, Institute of Geochemistry, Chinese Academy of Science, Guangzhou 510640, China.
Guangyu
G
Shi
Hua
H
Yin
Jinshao
J
Ye
Hui
H
Peng
Jun
J
Li
Chunling
C
Luo
D000332:Aerobiosis; D001711:Biotransformation; D004785:Environmental Pollutants / Q000378:metabolism*; D055768:Halogenated Diphenyl Ethers / Q000378:metabolism*; D011550:Pseudomonas aeruginosa / Q000378:metabolism*
D004785:Environmental Pollutants; D055768:Halogenated Diphenyl Ethers; C010902:decabromobiphenyl ether
Aerobic biodegradation; Cadmium ion; Intermediate product; PBDE-209