title: Liquid chromatography-positive ion electrospray mass spectrometry method for the quantification of citalopram in human plasma.
abstract: A rapid, sensitive and novel narrow-bore liquid chromatography-mass spectrometric method was developed and fully validated for the quantification of citalopram in human plasma. The analyte and internal standard (imipramine) were extracted by liquid-liquid extraction with a mixture of hexane-heptane-isopropanol (88:10:2, v/v/v). The use of a Hypersil BDS C(8) micro-bore column (250 mm x 2.1 mm i.d.; 3.5 microm particle size), results in substantial reduction in solvent consumption. The mobile phase consisted of 10 mM ammonium formate-formic acid (pH 4.5) and acetonitrile (30:70, v/v), pumped at a flow rate of 0.15 ml min(-1). The analytes were detected after positive electrospray ionization using the selected ion-monitoring mode of the species at m/z 325 for citalopram and m/z 281 for imipramine. The method had a chromatographic run time of 10.0 min and a linear calibration curve over the range 0.50-250 ng ml(-1) (r(2) > 0.996). The limit of quantitation was 0.50 ng ml(-1). Accuracy and precision were below the acceptance limits of 15%.
authors.affiliation: Department of Pharmaceutical Chemistry, School of Pharmacy, University of Athens, Panepistimioupolis Zografou, GR 15771 Athens, Greece. kpistos@pharm.uoa.gr
authors.forename: Constantinos
authors.initials: C
authors.lastname: Pistos
authors.forename: Irene
authors.initials: I
authors.lastname: Panderi
authors.forename: Julia
authors.initials: J
authors.lastname: Atta-Politou
mesh_terms: D000328:Adult; D002138:Calibration; D002851:Chromatography, High Pressure Liquid; D015283:Citalopram / Q000097:blood*; D005260:Female; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D011786:Quality Control; D012015:Reference Standards; D015203:Reproducibility of Results; D017367:Selective Serotonin Reuptake Inhibitors / Q000097:blood*; D012997:Solvents; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D015283:Citalopram; D007202:Indicators and Reagents; D017367:Selective Serotonin Reuptake Inhibitors; D012997:Solvents