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Liquid Chromatography-Tandem Mass Spectrometric Analysis of Octaethylene Glycol Monodecyl Ether in Rat Plasma and its Application to Pharmacokinetic Studies.
Journal of Analytical Toxicology 2017 May 2
Alcohol ethoxylates (AEs) are a major class of non-ionic surfactants, which are widely used in household, institutional and industrial cleaners, and they are considered as an alternative of nonylphenol. In this study, a rapid, sensitive and reliable bioanalytical method was developed for the determination of octaethylene glycol monodecyl ether (C10E8, an AE) in rat plasma using liquid chromatography-tandem mass spectrometry (LC-MS-MS). Chromatographic separation was performed on a reversed-phase C18 column (2.1 mm × 50 mm, 2.1 μm). The mobile phase consisted of 0.1% formic acid in distilled water and 0.1% formic acid in acetonitrile (40:60% v/v). The flow rate was 0.3 mL/min. For mass spectrometric detection, the multiple reaction monitoring (MRM) mode was used; the MRM transitions were m/z 511.5 → m/z 133.1 for C10E8 and m/z 423.3 → m/z 133.1 for hexaethylene glycol monodecyl ether (internal standard) in the positive ion mode. A calibration curve was constructed within the range of 2-2,000 ng/mL; the intra- (n = 5) and inter-day (n = 3) precision and accuracy were within 10%. The LC-MS-MS method was specific, accurate and reproducible, and this method was successfully applied in a pharmacokinetic study of C10E8 in rats. C10E8 was intravenously (1 mg/kg, n = 6) and orally (10 mg/kg, n = 7) administered to rats. The kinetic parameters were analyzed based on a noncompartmental statistical model using the pharmacokinetic modeling software (WinNonlin). The oral bioavailability of C10E8 was 34.4%.
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