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  • Title: Liquid chromatography-tandem mass spectrometry for quantification of lacosamide, an antiepileptic drug, in rat plasma and its application to pharmacokinetic study.
    Author: Kim SJ, Koo TS, Ha DJ, Baek M, Lee SK, Shin DS, Moon H.
    Journal: Biomed Chromatogr; 2012 Mar; 26(3):371-6. PubMed ID: 21735462.
    Abstract:
    A rapid, simple and sensitive liquid chromatography-tandem mass spectrometry (LC/MS/MS) was developed for the determination of an antiepileptic drug, lacosamide, in rat plasma. The method involves the addition of acetonitrile and internal standard solution to plasma samples, followed by centrifugation. An aliquot of the supernatant was diluted with water and directly injected into the LC/MS/MS system. The separations were performed on column packed with octadecylsilica (5 µm, 2.0 × 50 mm) with 0.1% formic acid and acetonitrile as mobile phase, and the detection was performed on tandem mass spectrometry by the multiple-reaction monitoring via an electrospray ionization source. The standard curve was linear over the concentration range from 0.3 to 1000 ng/mL. The lower limit of quantification was 0.3 ng/mL using 50 μL of rat plasma sample. The intra- and inter-assay precision and accuracy were found to be less than 11.7 and 8.8%, respectively. The developed analytical method was successfully applied to the pharmacokinetic study of lacosamide in rats.
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