KeywordsCarbondioxide.SupercriticalfluidExtraction.Capillarygaschromatography.Freecholesterol.Egg-containingfood.Solid-phaseextractionIntroductionTheuseofsupercriticalflu... Keywords Carbon dioxide . Supercritical fluid Extraction . Capillary gas chromatography . Free cholesterol . Egg-containing food . Solid-phase extraction
Introduction The use of supercritical fluid extraction (SFE) for sample preparation on an analytical scale has become more popular because it allows a lower solvent consumption, a reduction in the time of sample treatment and little sample manipulation. This leads to purer extracts and a reduced possibility of artefact formation. Several methods have been proposed for the determination of pollutants (pesticides, PAHs, PCBs), pharmaceutical drugs and fragrances [1] with supercritical carbon dioxide (SC-CO2). The analytical extraction of cholesterol by SFE for the quality control of food has been carried out on dried egg yolk [2, 3]. More recently cholesterol was extracted by SFE from bakery products, milk [4] and chicken liver [5]; quantitation was performed by an enzymic method or high-performance liquid chromatography (HPLC), respectively. A rapid sample preparation for the determination of free cholesterol in eggcontaining food is reported here. To achieve this, SCCO2 extraction was coupled on-line with solid-phase extraction (on-line SFE-SPE), thus obtaining extraction
and automatic clean-up of cholesterol in one step prior to gas chromatographic analysis.
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