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  • Electronic Resource  (2)
  • Argentation thin-layer chromatography  (1)
  • Cholesterol determination  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Determination of free cholesterol from dried egg yolk by on-line coupling of supercritical fluid extraction with solid-phase extraction (1997)
    Springer
    Zeitschrift für Lebensmittel-Untersuchung und -Forschung 205 (1997), S. 356-359 
    Details
    ISSN: 1431-4630
    Keywords: Key words Supercritical CO2 ; Solid-phase extraction ; Cholesterol determination ; Capillary gas chromatography ; Dried egg yolk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  A classic solvent extraction and a supercritical CO2 extraction (SFE) method for the determination of free cholesterol in dried egg yolk were compared. After lipid extraction, a solid-phase extraction (SPE) was performed to eliminate the non-polar lipids and to purify cholesterol. Free cholesterol was then determined by capillary gas chromatography. The supercritical extractor enabled on-line SPE after SFE, resulting in a shorter extraction time compared with that of the classic method. Improved repeatability and a smaller amount of solvent required are the main advantages of the method proposed here compared with the classic solvent extraction method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002170050180
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Chromatographic determination of position and configuration isomers of methyl oleate hydroxides from corresponding hydroperoxides (1993)
    Springer
    Chromatographia 36 (1993), S. 61-64 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Argentation thin-layer chromatography ; Solid phase extraction ; Fatty acid hydroperoxides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Studies of lipid oxidation usually employ such model systems as purified fatty-acid methyl ester. While methyl oleate hydroperoxides (MOPHs) can only be readily separated from the matrix by HPLC, because of their heat-susceptibility and relative instability, these same techniques are unable to separatecis MOHP fromtrans isomers. The present study reports an enhanced, rapid separation method forcis andtrans isomers of methyl oleate hydroxides, as well as HPLC determination of positional isomers per fraction of configuration isomer and isomer identification by gas chromatography-mass spectrometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02263838
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    Paper (German National Licenses)
    Fulltext
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