期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 647, 期 -, 页码 690-698出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2018.08.012
关键词
Gordonia sp strain NB4-1Y; 6:2 fluorotelomer sulfonamidoalkyl betaine (6:2 FTAB); 6:2 fluorotelomer sulfonate (6:2 FTSA); Biotransformation; Per - and polyfluoroalkyl substances (PFASs)
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Fonds de Recherche du Quebec (FRQ)
- Canadian Foundation for Innovation (CFI)
6:2 fluorotelomer sulfonamidoalkyl betaine (6:2 FTAB) is a major component of aqueous film-forming foams (AFFFs) used for firefighting and is frequently detected, along with one of its suspected transformation products, 6:2 fluorotelomer sulfonate (6:2 FTSA), in terrestrial and aquatic ecosystems impacted by AFFF usage. Biochemical processes underlying bacterial biodegradation of these compounds remain poorly understood due to a lack of pure culture studies. Here, we characterized the water-soluble and volatile breakdown products of 6: 2 FTSA and 6:2 FTAB produced using Gordonia sp. strain NB4-1Y cultures over seven days under sulfur-limited conditions. After 168 h, 99.9% of 60 mu M 6:2 FTSA was degraded into ten major breakdown products, with a mol% recovery of 88.2, while 70.4% of 60 mu M 6:2 FTAB was degraded into ten major breakdown products, with a mol% recovery of 84.7. NB4-1Y uses two pathways for 6:2 FTSA metabolism, with 55 mol% of breakdown products assigned to a major pathway and < 1.0 mol% assigned to a minor pathway. This work indicates that rapid transformation of 6:2 FTSA and 6:2 FTAB can be achieved under controlled conditions and improves the bacterial metabolism of these compounds. (C) 2018 Elsevier B.V. All rights reserved.
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