title: Determination of 3'-C-ethynylcytidine in human plasma and urine by liquid chromatographic-electrospray ionization tandem mass spectrometry.
abstract: A liquid chromatographic-electrospray ionization tandem mass spectrometric (LC-ESI/MS/MS) method was developed for the quantitative analysis of a novel anticancer drug, 3'-C-ethynylcytidine (I) in human plasma and urine. I and its stable isotope-labeled internal standard (II) were extracted from human plasma and urine samples using a polymer-based cation-exchange cartridge, and LC-ESI/MS/MS analysis was performed by monitoring the positive fragment ions of I and II. The linear ranges are 1-500 ng/ml in plasma and 10-5000 ng/ml in urine. The limits of quantitation for I were 1 ng/ml in plasma and 10 ng/ml in urine. The relative errors (RE) for I ranged from -8.4 to 3.0% in plasma and from 0.8 to 4.4% in urine. The relative standard deviations (RSD) for I ranged from 1.2 to 8.9% in plasma and from 0.7 to 2.8% in urine. This validated analytical method is demonstrated to be useful for the analysis of I in human plasma and urine in clinical studies.
authors.affiliation: Pharmacokinetics Research Laboratory, Taiho Pharmaceutical Co. Ltd., 224-2 Ebisuno, Hiraishi, Kawauchi-cho, Tokushima 771-0194, Japan. kazu-matsuoka@taiho.co.jp
authors.forename: Kazuaki
authors.initials: K
authors.lastname: Matsuoka
authors.forename: Ryuichi
authors.initials: R
authors.lastname: Kitamura
authors.forename: Eiji
authors.initials: E
authors.lastname: Matsushima
authors.forename: Yasuro
authors.initials: Y
authors.lastname: Kawaguchi
mesh_terms: D000970:Antineoplastic Agents / Q000032:analysis* / Q000097:blood / Q000652:urine; D002138:Calibration; D002853:Chromatography, Liquid; D003562:Cytidine / Q000031:analogs & derivatives* / Q000032:analysis* / Q000097:blood / Q000652:urine; D006801:Humans; D007202:Indicators and Reagents; D009369:Neoplasms / Q000097:blood / Q000652:urine; D011786:Quality Control; D012015:Reference Standards; D015203:Reproducibility of Results; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: C103084:1-(3-C-ethynylribopentofuranosyl)cytosine; D000970:Antineoplastic Agents; D007202:Indicators and Reagents; D003562:Cytidine