Journal
CHEMOSPHERE
Volume 105, Issue -, Pages 62-67Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2013.12.039
Keywords
Organotin; Triphenyltin; Biodegradation; Ion release; Brevibacillus brevis
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Funding
- National Natural Science Foundation of China [21377047, 21007020, U0933002]
- Natural Science Foundation of Guangdong Province [S2013010012662]
- Science and Technology Foundation of Pearl River [2012J2200056]
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Triphenyltin (TPT) is an endocrine disruptor that has polluted the global environment, and thus far, information regarding the mechanisms of TPT biodegradation and intracellular material release is limited. Here, TPT biodegradation was conducted by using Brevibacillus brevis. Degradation affecting factors, metabolite formation, ion and protein release, membrane permeability, and cell viability after degradation were investigated to reveal the biodegradation mechanisms. The results showed that TPT could be degraded simultaneously to diphenyltin and monophenyltin, with diphenyltin further degraded to monophenyltin, and ultimately to inorganic tin. During degradation process, B. brevis metabolically released Cl- and Na+, and passively diffused Ca2+. Protein release and membrane permeability were also enhanced by TPT exposure. pH ranging from 6.0 to 7.5 and relatively high biomass dosage in mineral salt medium improved TPT degradation. Biodegradation efficiency of 0.5 mg L-1 TPT by 0.3 g L-1 B. brevis at 25 degrees C for 5 d was up to 80%. (C) 2013 Elsevier Ltd. All rights reserved.
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