title: Sensitive method for the determination of ibutilide in human plasma by liquid chromatography-tandem mass spectrometry.
abstract: A rapid, selective and sensitive liquid chromatography-tandem mass spectrometry (LC-MS-MS) method was developed and validated for determination of ibutilide in human plasma. The analyte and internal standard sotalol were extracted from plasma samples by liquid-liquid extraction, and separated on a C(18) column, using acetonitrile-water-10% butylamine-10% acetic acid (80:20:0.07:0.06, v/v/v/v) as the mobile phase. Detection was performed on a triple-quadrupole tandem mass spectrometer by multiple reaction monitoring (MRM) mode via TurboIonSpray ionization (ESI). Linear calibration curves were obtained in the concentration range of 20-10,000 pg/ml, with a lower limit of quantitation of 10 pg/ml. The intra- and inter-day precision values were below 8% and accuracy was within +/-3% at all three QC levels. The method was utilized to support clinical pharmacokinetic studies of ibutilide in healthy volunteers following intravenous administration.
authors.affiliation: Clinical Pharmacology Center, Fu Wai Hospital, CAMS and PUMC, 167 Beilishi Road, Beijing 100037, PR China. ittl@fuwaihospital.org
authors.forename: Lei
authors.initials: L
authors.lastname: Tian
authors.forename: Yishi
authors.initials: Y
authors.lastname: Li
authors.forename: Yiling
authors.initials: Y
authors.lastname: Huang
authors.forename: Fuhua
authors.initials: F
authors.lastname: Kuang
authors.forename: Feiou
authors.initials: F
authors.lastname: Li
authors.forename: Lu
authors.initials: L
authors.lastname: Hua
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods; D004355:Drug Stability; D006801:Humans; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods; D013449:Sulfonamides / Q000097:blood* / Q000493:pharmacokinetics
chemical_list: D013449:Sulfonamides; C067192:ibutilide