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- W2582807567 abstract "1 Department of Pharmacy and Food Sciences, Lascaray Research Centre, University of the Basque Country (UPV/EHU), 01006, Vitoria-Gasteiz, Spain 2 Guelph Food Research Centre, Agriculture & Agri-Food Canada, Guelph, ON, Canada (retired) Silver ion solid-phase extraction (Agþ-SPE) was reported to provide effective separations compared to other Agþ techniques but at a fraction of cost and time. Agþ-SPE cartridges resolved fatty acid methyl esters (FAMEs) with different number and/or geometric configuration of double bonds. Here we attempted to determine the trans fatty acids (FA) contained in a low total trans FA sample, horse lipids; lamb was used as a control having a markedly higher total trans content. Gas chromatographic assessment of the fractions showed a good separation of the cis and transmonounsaturated FA (MUFA) fractions, but the relative high content of contaminants that coeluted with these FA impaired the identification of the latter in horse lipids. In lamb trans MUFA isomers could be identified since their abundance relative to impurities was greater. Several attempts were made to remove the contaminants from the SPE cartridges including an extensive prewash with acetone and hexane, a prewash with solvents that would elute the cis MUFA fraction, and a complete prewash of all solvents used in the fractionation, hexane, acetone, and acetonitrile. The prewash using all elution solvents removed most contaminants but subsequently impaired the separation of trans and cis MUFA fractions. The same samples were subjected to Agþ-HPLC fractionation that showed no impurities demonstrating that they were derived from the Agþ-SPE separation. The trans MUFA fraction collected from Agþ-HPLC allowed for the identification of the trans 16:1 and 18:1 FA in horse lipids and is recommended for samples with low trans levels." @default.
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- W2582807567 date "2014-01-01" @default.
- W2582807567 modified "2023-09-27" @default.
- W2582807567 title "Short Communication Limitation of using silver ion solid-phase extraction for animal lipids with a low trans content" @default.
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