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Determination Of Zaltoprofen In Human Plasma By Liquid Chromatography With Electrospray Tandem Mass Spectrometry: Application To A Pharmacokinetic Study.

Heon-Woo Lee, Ji-Hyung Seo, Yongwon Kim, Seo-Young Jeong, Kyung-Tae Lee
Published 2006 · Chemistry, Medicine
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In the present study, we developed a method coupling liquid-liquid extraction (LLE) to high-performance liquid chromatography (HPLC) with positive ion electrospray ionization tandem mass spectrometry (ESI-MS/MS) to determine zaltoprofen levels in human plasma, using enalapril as internal standard (IS). The high sensitivity and specificity of MS/MS detection enabled the use of small plasma volumes (250 microL) and a simple LLE procedure. Furthermore, the short run-times (2 min) involved are compatible with the requirements of large-scale clinical studies. Ion acquisition was performed in multiple reaction monitoring (MRM) mode by monitoring the transitions m/z 299.3 > 225.0 for zaltoprofen and m/z 377.4 > 234.2 for the IS enalapril. The limit of detection (LOD) was 0.01 microg/mL and the lower limit of quantitation (LLOQ) was 0.05 microg/mL. The devised method was linear over the studied range (0.05-20 microg/mL), with r2 > 0.99 and a run-time of 2 min. Intra-day precisions fell in the range 2.0-13.8%, inter-day precisions in the range 2.1-3.9%, and intra- and inter-day accuracies in the range 102.8-114.1%. The described method provides a fast and sensitive analytical tool for zaltoprofen and was successfully applied to a 24-subject pharmacokinetic study.



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