期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 409, 期 24, 页码 5505-5512出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2011.08.022
关键词
Sulfamethazine; Trametes versicolor; Sewage sludge; Degradation metabolites; UPLC-QqTOF-MS analysis
资金
- Spanish Ministry of MMAMRM [010/PC08/3-04]
- Spanish Ministry of Science and Education [CGL2007-64551]
- Generalitat de Catalunya [2009-SGR00796, 2009-SGR-656]
- AGAUR (Generalitat de Catalunya, Spain)
- Universidad de Costa Rica and Consejo Superior de Investigaciones Cientificas (UCR-CSIC collaboration)
Degradation of the sulfonamide sulfamethazine (SMZ) by the white-rot fungus Trametes versicolor was assessed. Elimination was achieved to nearly undetectable levels after 20 h in liquid medium when SMZ was added at 9 mg L-1. Experiments with purified laccase and laccase-mediators resulted in almost complete removal. On the other hand, inhibition of SMZ degradation was observed when piperonilbutoxide, a cytochrome P450-inhibitor, was added to the fungal cultures. UPLC-QqTOF-MS analysis allowed the identification and confirmation of 4 different SMZ degradation intermediates produced by fungal cultures or purified laccase: desulfo-SMZ, N-4-formyl-SMZ, N-4-hydroxy-SMZ and desamino-SMZ; nonetheless SMZ mineralization was not demonstrated with the isotopically labeled sulfamethazine-phenyl-C-13(6) after 7 days. Inoculation of T. versicolor to sterilized sewage sludge in solid-phase systems showed complete elimination of SMZ and also of other sulfonamides (sulfapyridine, sulfathiazole) at real environmental concentrations, making this fungus an interesting candidate for further remediation research. (C) 2011 Elsevier B.V. All rights reserved.
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