期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1455, 期 -, 页码 45-56出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2016.05.085
关键词
Solvent-assisted stir bar sorptive extraction (SA-SBSE); Solvent swollen PDMS; Polar solutes; Aroma compounds in beer; Pesticides in wine
A novel solvent-assisted stir bar sorptive extraction (SA-SBSE) technique was developed for enhanced recovery of polar solutes in aqueous samples. A conventional PDMS stir bar was swollen in several solvents with log K-ow ranging from 1.0 to 3.5 while stirring for 30 min prior to extraction. After extraction, thermal desorption - gas chromatography - (tandem) mass spectrometry (TD-GC-(MS/)MS) or liquid desorption - large volume injection (LD-LVI)-GC-MS were performed. An initial study involved investigation of potential solvents for SA-SBSE by weighing of the residual solvent in the swollen PDMS stir bar before and after extraction. Compared to conventional SBSE, SA-SBSE using diethyl ether, methyl isobutyl ketone, dichloromethane, diisopropyl ether and toluene provided higher recoveries from water samples for test solutes with log K-ow <2.5. For SA-SBSE using dichioromethane, recoveries were improved by factors of 1.4-4.1, while maintaining or even improving the recoveries for test solutes with log K-ow >2.5. The performance of the SA-SBSE method using dichioromethane, diisopropyl ether, and cyclohexane is illustrated with analyses of aroma compounds in beer and of pesticides in wine. (C) 2016 The Authors. Published by Elsevier B.V.
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