title: Validation of a sensitive and automated 96-well solid-phase extraction liquid chromatography-tandem mass spectrometry method for the determination of desloratadine and 3-hydroxydesloratadine in human plasma.
abstract: To support clinical development, a liquid chromatographic-tandem mass spectrometric (LC-MS-MS) method was developed and validated for the determination of desloratadine (descarboethoxyloratadine) and 3-OH desloratadine (3-hydroxydescarboethoxyloratadine) concentrations in human plasma. The method consisted of automated 96-well solid-phase extraction for sample preparation and liquid chromatography/turbo ionspray tandem mass spectrometry for analysis. [2H(4)]Desloratadine and [2H(4)]3-OH desloratadine were used as internal standards (I.S.). A quadratic regression (weighted 1/concentration(2)) gave the best fit for calibration curves over the concentration range of 25-10000 pg/ml for both desloratadine and 3-OH desloratadine. There was no interference from endogenous components in the blank plasma tested. The accuracy (%bias) at the lower limit of quantitation (LLOQ) was -12.8 and +3.4% for desloratadine and 3-OH desloratadine, respectively. The precision (%CV) for samples at the LLOQ was 15.1 and 10.9% for desloratadine and 3-OH desloratadine, respectively. For quality control samples at 75, 1000 and 7500 pg/ml, the between run %CV was </=7.5% for desloratadine and </=6.3% for 3-OH desloratadine. Between run %bias ranged from 4.1 to 8.0% for desloratadine and -11.5 to -4.8% for 3-OH desloratadine. Desloratadine and 3-OH desloratadine were stable in human plasma for 401 days at -22 degrees C, after five freeze/thaw cycles, up to 24 h at room temperature, and in reconstituted sample extracts (up to 185 h at 5 degrees C). This LC-MS-MS method for the determination of desloratadine and 3-OH desloratadine in human plasma met regulatory requirements for selectivity, sensitivity, goodness of fit, precision, accuracy and stability.
authors.affiliation: Schering-Plough Research Institute, 2015 Galloping Hill Road, Kenilworth, NJ 07033-1300, USA.
authors.forename: Liyu
authors.initials: L
authors.lastname: Yang
authors.forename: Robert P
authors.initials: RP
authors.lastname: Clement
authors.forename: Bhavna
authors.initials: B
authors.lastname: Kantesaria
authors.forename: Larisa
authors.initials: L
authors.lastname: Reyderman
authors.forename: Francis
authors.initials: F
authors.lastname: Beaudry
authors.forename: Charles
authors.initials: C
authors.lastname: Grandmaison
authors.forename: Lorella
authors.initials: L
authors.lastname: Di Donato
authors.forename: Robert
authors.initials: R
authors.lastname: Masse
authors.forename: Patrick J
authors.initials: PJ
authors.lastname: Rudewicz
mesh_terms: D001331:Automation; D002138:Calibration; D002853:Chromatography, Liquid / Q000379:methods*; D006801:Humans; D017336:Loratadine / Q000031:analogs & derivatives* / Q000097:blood*; D013058:Mass Spectrometry / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: C482880:3-hydroxydesloratadine; D017336:Loratadine; C121345:desloratadine