title: Determination of paroxetine in human plasma by high-performance liquid chromatography using 7,7,8,8-tetracyanoquinodimethane as the derivatization reagent.
abstract: A selective and sensitive reversed-phase HPLC method was developed for the determination of the antidepressant paroxetine in plasma. The method is based on the purple chromogen formed by a displacement reaction of paroxetine with 7,7,8,8-tetracyanoquinodimethane (TCNQ) in acetonitrile at 80 degrees C for 20 minutes. For the assay, the drug was extracted from 1 mL of plasma with chloroform and, after sample alkalinization, derivatized with TCNQ; then the reaction mixture was directly injected into a C18 column. Desipramine was used as internal standard. The mobile phase was acetonitrile-water (70:30) at a flow-rate of 1.0 mL/min, and the derivatives were eluted at 13.1 and 15.5 minutes for paroxetine and desipramine, respectively, and detected at 567 nm. Calibration curve was found linear over the range of 20-400 ng/mL, and the detection limit was 2 ng/mL at a signal-to-noise ratio of 3/1. Recoveries determined for 3 concentrations range between 81.3% and 88.1%. Intraday and interday relative standard deviation values were found to be within 3.8%-13.5% and 8.2%-14.6%, respectively. With this developed method, a pharmacokinetic study was performed for paroxetine.
authors.affiliation: Department of Analytical Chemistry, Istanbul University, Faculty of Pharmacy, Istanbul, Turkey.
authors.forename: Armağan
authors.initials: A
authors.lastname: Onal
authors.forename: Aysel
authors.initials: A
authors.lastname: Oztunç
mesh_terms: D000284:Administration, Oral; D000328:Adult; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005260:Female; D006801:Humans; D015394:Molecular Structure; D009570:Nitriles / Q000737:chemistry*; D017374:Paroxetine / Q000008:administration & dosage / Q000097:blood* / Q000493:pharmacokinetics; D015203:Reproducibility of Results; D017367:Selective Serotonin Reuptake Inhibitors / Q000008:administration & dosage / Q000737:chemistry / Q000493:pharmacokinetics; D013607:Tablets
chemical_list: D009570:Nitriles; D017374:Paroxetine; D017367:Selective Serotonin Reuptake Inhibitors; D013607:Tablets; C013703:tetracyanoquinodimethane