title: Determination of misoprostol acid in human plasma by liquid chromatography coupled to tandem mass spectrometry.
abstract: A rapid and sensitive liquid chromatographic/tandem mass spectrometric method for determination of misoprostol acid, the active metabolite of misoprostol, was developed and validated. Following liquid-liquid extraction, the analytes were separated using an isocratic mobile phase on a C(18) column. An API 4000 tandem mass spectrometer equipped with Turbo IonSpray ionization source was used as detector and was operated in the negative ion mode. Multiple reaction monitoring using the precursor to product ion combinations of m/z 367-249 and 296-269 was performed to quantify misoprostol acid and the internal standard hydrochlorothiazide, respectively. The method was linear in the concentration range of 10.0-3000 pg mL(-1) using 200 microL plasma. The lower limit of quantification was 10.0 pg mL(-1). The intra- and inter-day relative standard deviation over the entire concentration range was less than 8.3%. Accuracy determined at three concentrations (25.0, 200 and 2700 pg mL(-1) for misoprostol acid) ranged from -0.5 to 1.2% in terms of relative error. Each plasma sample was chromatographed within 3.5 min. The method was successfully used in a pharmacokinetic study of misoprostol in human plasma after an oral administration of 0.6 mg misoprostol.
authors.affiliation: Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 646 Songtao Road, Shanghai 201203, PR China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Zou
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Chen
authors.forename: Bo
authors.initials: B
authors.lastname: Song
authors.forename: Dafang
authors.initials: D
authors.lastname: Zhong
mesh_terms: D019540:Area Under Curve; D002138:Calibration; D002853:Chromatography, Liquid / Q000379:methods*; D006207:Half-Life; D006801:Humans; D016595:Misoprostol / Q000031:analogs & derivatives* / Q000097:blood / Q000493:pharmacokinetics; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D016595:Misoprostol; C047042:misoprostol acid