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首页> 外文期刊>The Science of the Total Environment >Degradation and defluorination of 6:2 fluorotelomer sulfonamidoalkyl betaine and 6:2 fluorotelomer sulfonate by Gordonia sp. strain NB4-1Y under sulfur-limiting conditions
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Degradation and defluorination of 6:2 fluorotelomer sulfonamidoalkyl betaine and 6:2 fluorotelomer sulfonate by Gordonia sp. strain NB4-1Y under sulfur-limiting conditions

机译:Gordonia sp。对6:2含氟端粒磺酰胺基烷基甜菜碱和6:2含氟端粒磺酸盐的降解和脱氟。硫限制条件下的NB4-1Y菌株

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摘要

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.
机译:6:2含氟调聚物磺酰胺基烷基甜菜碱(6:2 FTAB)是用于消防的水性成膜泡沫(AFFF)的主要成分,经常被发现,以及其怀疑的转化产物之一6:2含氟调聚物磺酸盐(6: 2 FTSA),受AFFF使用影响的陆地和水生生态系统。由于缺乏纯培养研究,对这些化合物细菌生物降解的生化过程知之甚少。在这里,我们表征了使用Gordonia sp。生产的6:2 FTSA和6:2 FTAB的水溶性和挥发性分解产物。 NB4-1Y菌株在硫限制条件下培养7天。 168小时后,60亩M 6:2 FTSA的99.9%降解为十种主要分解产物,摩尔%回收率为88.2,而60亩M 6:2 FTAB的70.4%降解为十种主要分解产物,其中摩尔%回收率为84.7。 NB4-1Y使用两种途径进行6:2 FTSA代谢,其中55 mol%的分解产物分配给主要途径,而<1.0 mol%分配给次要途径。这项工作表明,在受控条件下可以实现6:2 FTSA和6:2 FTAB的快速转化,并改善了这些化合物的细菌代谢。 (C)2018 Elsevier B.V.保留所有权利。

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