title: Determination of zaltoprofen in human plasma by liquid chromatography with electrospray tandem mass spectrometry: Application to a pharmacokinetic study.
abstract: 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.
authors.affiliation: College of Pharmacy, Kyung-Hee University, Dongdaemun-Ku, Seoul 130-701, Korea.
authors.forename: Heon-Woo
authors.initials: HW
authors.lastname: Lee
authors.forename: Ji-Hyung
authors.initials: JH
authors.lastname: Seo
authors.forename: Yong-Won
authors.initials: YW
authors.lastname: Kim
authors.forename: Seo-Young
authors.initials: SY
authors.lastname: Jeong
authors.forename: Kyung-Tae
authors.initials: KT
authors.lastname: Lee
mesh_terms: D000284:Administration, Oral; D000328:Adult; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000097:blood / Q000493:pharmacokinetics; D019540:Area Under Curve; D001578:Benzopyrans / Q000097:blood / Q000493:pharmacokinetics; D002851:Chromatography, High Pressure Liquid; D006207:Half-Life; D006801:Humans; D008297:Male; D011422:Propionates / Q000097:blood / Q000493:pharmacokinetics; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000295:instrumentation / Q000379:methods*; D053719:Tandem Mass Spectrometry / Q000295:instrumentation / Q000379:methods*
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D001578:Benzopyrans; D011422:Propionates; C043940:pyranoprofen