期刊
CHEMOSPHERE
卷 112, 期 -, 页码 34-41出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2014.02.068
关键词
6:2 Fluorotelomer iodide (6:2 FTI); 6:2 Fluorotelomer alcohol (6:2 FTOH); 5:3 Acid; Perfluorocarboxylic acids (PFCAs); In vitro metabolism; Rat liver microsomes
资金
- National Natural Science Foundation [21207140, 20890111]
- National Basic Research Program of China [2009CB421603]
- Chinese Academy of Science [YSW2013B01, GJHZ1202]
6:2 Fluorotelomer iodide [6:2 FTI, F(CF2)(6)CH2CH2I] is the industrial raw material used to manufacture 6:2 fluorotelomer alcohol [6:2 FTOH, F(CF2)(6)CH2CH2OH] and 6:2 FTOH-based products. During its manufacture and industrial use, workers may be exposed to via oral, dermal or inhalation of 6:2 FTI. Therefore it is useful to understand how 6:2 HI may be metabolized and into what transformation products. 6:2 FTI in vitro rat liver microsomal metabolism was explored for the first time to compare its biotransformation potential with that of [1,2-C-14] 6:2 FTOH [F(CF2)(6)(CH2CH2OH)-C-14-C-14]. 6:2 FTI and 6:2 FTOH metabolite yields were determined in closed-bottle systems using Sprague Dawley and Wistar Han rat microsomes after incubation at 37 C for up to 6 h with NADPH (reduced form of nicotinamide adenine dinucleotide phosphate)-addition and NADPH-regenerating systems, respectively. 5:3 acid [F(CF2)(5)CH2CH2COOH] was the most abundant metabolite for 6:2 FTI (3.3-6.3 mol%) and 6:2 FTOH (9-12 mol%). Perfluorobutanoic acid (PFBA), perfluoropentanoic acid (PFPeA), and perfluorohexanoic acid (PFHxA) in sum accounted for 1.3-2.2 mol% from 6:2 FTI and 2.7-4.4 mol% from 6:2 FTOH biotransformation. Perfluoroheptanoic acid (PFHpA) accounted for 0.14-0.36 mol% from 6:2 FTI but only 0.01-0.06 mol% from 6:2 FTOH biotransformation. These results suggest that mammalian systems exposed to 6:2 FTI or 6:2 FTOH would form 5:3 acid, PFBA, PFPeA, PFHxA as the primary stable metabolites, whereas more PFHpA would be expected from 6:2 FTI biotransformation. (C) 2014 Elsevier Ltd. All rights reserved.
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