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  • Title: Determination of low levels of poly(ethylene glycol) 400 in plasma and urine by capillary gas chromatography-selected ion-monitoring mass spectrometry after solid-phase extraction.
    Author: Fakt C, Ervik M.
    Journal: J Chromatogr B Biomed Sci Appl; 1997 Oct 24; 700(1-2):93-100. PubMed ID: 9390718.
    Abstract:
    A convenient and sensitive method for the quantitative determination of poly(ethylene glycol) 400 in plasma and urine with capillary gas chromatography-mass spectrometry has been developed. The sample preparation involves solid-phase extraction with subsequent derivatization with heptafluorobutyric anhydride, which proved to give the most stable derivative. The derivatization procedure was optimized using experimental design, and different solid-phase extraction columns were evaluated. The limit of quantitation was 1 micromol/l (0.4 microg/ml) for both plasma and urine.
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