title: Development and validation of a selective and robust LC-MS/MS method for high-throughput quantifying rizatriptan in small plasma samples: application to a clinical pharmacokinetic study.
abstract: An analytical method based on liquid chromatography with positive ion electrospray ionization (ESI) coupled to tandem mass spectrometry detection (LC-MS/MS) was developed for the determination of a potent 5-HT(1B/1D) receptor agonist, rizatriptan in human plasma using granisetron as the internal standard. The analyte and internal standard were isolated from 100 microL plasma samples by liquid-liquid extraction (LLE) and chromatographed on a Lichrospher C18 column (4.6mm x 50mm, 5 microm) with a mobile phase consisting of acetonitrile-10mM aqueous ammonium acetate-acetic acid (50:50:0.5, v/v/v) pumped at 1.0 mL/min. The method had a chromatographic total run time of 2 min. A Varian 1200 L electrospray tandem mass spectrometer equipped with an electrospray ionization source was operated in selected reaction monitoring (SRM) mode with the precursor-to-product ion transitions m/z 270-->201 (rizatriptan) and 313.4-->138 (granisetron) used for quantitation. The assay was validated over the concentration range of 0.05-50 ng/mL and was found to have acceptable accuracy, precision, linearity, and selectivity. The mean extraction recovery from spiked plasma samples was above 98%. The intra-day accuracy of the assay was within 12% of nominal and intra-day precision was better than 13% C.V. Following a 10mg dose of the compound administered to human subjects, mean concentrations of rizatriptan ranged from 0.2 to 70.6 ng/mL in plasma samples collected up to 24h after dosing. Inter-day accuracy and precision results for quality control samples run over a 5-day period alongside clinical samples showed mean accuracies of within 12% of nominal and precision better than 9.5% C.V.
authors.affiliation: Department of Pharmaceutical Analysis, School of Pharmacy, Second Military Medical University, No. 325 Guohe Road, Shanghai 200433, PR China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Chen
authors.forename: Haijun
authors.initials: H
authors.lastname: Miao
authors.forename: Mei
authors.initials: M
authors.lastname: Lin
authors.forename: Guorong
authors.initials: G
authors.lastname: Fan
authors.forename: Zhanying
authors.initials: Z
authors.lastname: Hong
authors.forename: Huiling
authors.initials: H
authors.lastname: Wu
authors.forename: Yutian
authors.initials: Y
authors.lastname: Wu
mesh_terms: D000328:Adult; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D017829:Granisetron / Q000032:analysis / Q000097:blood / Q000592:standards; D006801:Humans; D008297:Male; D015394:Molecular Structure; D012015:Reference Standards; D015203:Reproducibility of Results; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods; D053719:Tandem Mass Spectrometry / Q000379:methods*; D014230:Triazoles / Q000097:blood* / Q000493:pharmacokinetics; D014363:Tryptamines / Q000097:blood* / Q000493:pharmacokinetics
chemical_list: D017829:Granisetron; D014230:Triazoles; D014363:Tryptamines; C093622:rizatriptan