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  • Cation-exchange chromatography  (1)
  • Polycyclic aromatics  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Direct determination of Benzo[a]pyrene in oil distillates by on-line two-dimensional HPLC with column switching (1992)
    Springer
    Chromatographia 34 (1992), S. 376-380 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Column switching ; Polycyclic aromatics ; Oil distillates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A selective and sensitive HPLC method for the determination of Benzo[a]pyrene (B[a]p) in oil fractions by means of column switching is described. The diluted oil samples were injected directly onto a silica column with isooctane as eluent. After fast elution of the main part of the sample matrix, the B[a]p containing fraction was transferred on-line to a dinitro-aryl-modified silica column for final separation with isooctane/tetrahydrofuran. A detection limit of 50 ppt B[a]p was found when using fluorescence detection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268371
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cation-exchange chromatographic isolation of the methionine-bound sulfur in casein hydrolysates for stable-isotope-ratio analysis (1998)
    Springer
    Chromatographia 47 (1998), S. 271-277 
    Details
    ISSN: 1612-1112
    Keywords: Column Liquid chromatography ; Cation-exchange chromatography ; Sulfur stable-isotope-ratio analysis ; Casein hydrolysate ; Methionine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A chromatographic method is described for the isolation of the methionine-bound sulfur in casein for stable-isotope-ratio analysis. Casein is cleaved by acid hydrolysis and the high-molecular-weight secondary products formed are removed by adsorption on octadecyl-silica. Methionine is separated from the bulk of the polar amino acids by cation-exchange chromatography and subsequently oxidized to methionine sulfone by performic and peracetic acid. In a further step the methionine is isolated from the accompanying nonpolar amino acids by cation-exchange chromatography with a mobile phase of very low eluent strength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02466531
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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