Gas chromatographic separation and mass spectrometric identification of mixtures of oxyphytosterol and oxycholesterol derivatives application to a phytosterol-enriched food

Journal of Chromatography. a
A GrandgirardO Berdeaux

Abstract

Pure individual phytosterols were prepared using reversed-phase HPLC in order to obtain the oxidized compounds of sitosterol, campesterol, stigmasterol and brassicasterol. 7-Hydroxy-, 7-keto-, 5,6-epoxy-, 4beta-hydroxy-, 4-ene-6-hydroxy-, 6-keto- and 5alpha,6beta-dihydroxyphytosterols were obtained as well as analogous compounds of cholesterol. The gas chromatographic properties as well as the electronic impact mass spectra of these compounds (as trimethylsilyl ether derivatives) were studied. These data were used to identify oxyphytosterols in a spread enriched in phytosterols: the oxyphytosterols represented no more than 68 microg/g of spread (about 0.08% of phytosterols were oxidised).

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Citations

Mar 15, 2011·Journal of Agricultural and Food Chemistry·Marina González-LarenaMaría Jesús Lagarda
May 19, 2012·Journal of Agricultural and Food Chemistry·Olivia KennyNora M O'Brien
Apr 12, 2012·Journal of Agricultural and Food Chemistry·Anne VejuxGérard Lizard
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