title: Validation and application of a liquid chromatography-tandem mass spectrometric method for quantification of the drug transport probe fexofenadine in human plasma using 96-well filter plates.
abstract: A rapid method to determine fexofenadine concentrations in human plasma using protein precipitation in 96-well plates and liquid chromatography-tandem mass spectrometry was validated. Plasma proteins were precipitated with acetonitrile containing the internal standard fexofenadine-d6, mixed briefly, and then filtered into a collection plate. The resulting filtrate was diluted and injected onto a Phenomenex Gemini C18 (50 mm x 2.0 mm, 5 microm) analytical column. The mobile phase consisted of 0.1% formic acid, 5 mM ammonium acetate in deionized water and methanol (35:65, v/v). The flow rate was 0.2 ml/min and the total run time was 2 min. Detection of the analytes was achieved using positive ion electrospray ionization and high resolution multiple reaction monitoring mode (H-SRM). The linear standard curve ranged from 1 to 500 ng/ml and the precision and accuracy (intra- and inter-run) were within 4.3% and 8.0%, respectively. The method has been applied successfully to determine fexofenadine concentrations in human plasma samples obtained from subjects administered a single oral dose of fexofenadine. The method is rapid, sensitive, selective and directly applicable to human pharmacokinetic studies involving fexofenadine.
authors.affiliation: Department of Pharmacotherapy and Translational Research, College of Pharmacy, University of Florida, Gainesville, FL 32610, USA.
authors.forename: Melonie L
authors.initials: ML
authors.lastname: Stanton
authors.forename: Melanie S
authors.initials: MS
authors.lastname: Joy
authors.forename: Reginald F
authors.initials: RF
authors.lastname: Frye
mesh_terms: D000284:Administration, Oral; D018926:Anti-Allergic Agents / Q000008:administration & dosage / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics; D001692:Biological Transport; D002138:Calibration; D002853:Chromatography, Liquid / Q000295:instrumentation* / Q000379:methods*; D004355:Drug Stability; D006801:Humans; D057230:Limit of Detection; D011786:Quality Control; D012015:Reference Standards; D053719:Tandem Mass Spectrometry / Q000295:instrumentation* / Q000379:methods*; D016593:Terfenadine / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000097:blood / Q000737:chemistry / Q000493:pharmacokinetics
chemical_list: D018926:Anti-Allergic Agents; D016593:Terfenadine; C093230:fexofenadine