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  • 1
    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)
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of isomers of cholesteryl acetate hydroperoxides by HPLC and GC-ITDMS (1994)
    Springer
    Chromatographia 39 (1994), S. 577-580 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography-mass spectrometry ; Column liquid chromatography ; Cholesteryl acetate ; Hydroperoxide formation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Gas chromatographic, high performance liquid chromatographic and GC-ion trap detector mass spectrometric analyses of the hydroperoxides formed during thermal peroxidation of cholesteryl acetate, are reported and discussed. The hydroperoxides were separated from the thermal-oxidised mixture by solid-phase extraction, fractionated and individually collected by HPLC. Each hydroperoxide was then chemically reduced with NaBH4 to a hydroxy-derivative. The GC and MS characteristics of hydroxy- and TMS-derivatives were compared against available standards. Only 7β-hydroperoxide and 7α-hydro-peroxide of cholesteryl acetate were found, as reported in the literature for cholesterol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268282
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Thermal degradation of single 7-cholesteryl acetate hydroperoxide (1996)
    Springer
    Chromatographia 42 (1996), S. 29-33 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Gas chromatography-mass spectrometry ; 7-Cholesteryl acetate hydroperoxides (CAHPs) ; Thermal degradation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The thermal degradation products of the 7α- and 7β-cholesteryl 3β-acetate hydroperoxides obtained by thermal oxidation of cholesteryl 3β-acetate are reported and discussed. The hydroperoxides were degraded in both the vapour and condensed phases. The main components identified were 7-ketocholesteryl 3β-acetate, 7α- and 7β-hydroxycholesteryl 3β-acetates and the products generated from the loss of the hydroperoxide group and/or of acetic acid. Remarkable is the finding of the epoxy-hydroxy derivatives of cholesteryl acetate among the degradation products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02271051
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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