title: Simultaneous determination of haloperidol and bromperidol and their reduced metabolites by liquid-liquid extraction and automated column-switching high-performance liquid chromatography.
abstract: This study describes a new simultaneous determination of haloperidol and bromperidol and their reduced metabolites by modification of automated column-switching high-performance liquid chromatography. The test compounds were extracted from 1ml of plasma using chloroform-hexane (30:70 (v/v)), and the extract was injected into a hydrophilic metaacrylate polymer column for clean-up and a C(18) analytical column for separation. The mobile phases consisted of phosphate buffer (0.02M, pH 4.6), perchloric acid (60%) and acetonitrile (54:1:45 (v/v)) and was delivered at a flow-rate of 0.6ml/min. The peak was detected using a UV detector set at 215nm. The method was validated for the concentration range 1-100ng/ml, and good linearity (r >0.999) was confirmed. Intra-day coefficient variations (CVs) for haloperidol, reduced haloperidol, bromperidol and reduced bromperidol were less than 2.5, 3.1, 2.4 and 2.5%, respectively. Inter-day CVs for corresponding compounds were 3.9, 5.1, 2.6 and 4.4%, respectively. Relative errors ranged from -5 to 10% and mean recoveries were 96-100%. The limit of quantification was 1.0ng/m for each compound. This method shows good specificity with respect to commonly prescribed psychotropic drugs, and it could be successfully applied for pharmacokinetic studies and therapeutic drug monitoring, particularly in patients receiving both haloperidol and bromperidol.
authors.affiliation: Department of Clinical Pharmacology, School of Medicine, Hirosaki University, Hirosaki 036-8562, Japan. yasufuru@cc.hirosaki-u.ac.jp
authors.forename: Norio
authors.initials: N
authors.lastname: Yasui-Furukori
authors.forename: Yoshimasa
authors.initials: Y
authors.lastname: Inoue
authors.forename: Misturu
authors.initials: M
authors.lastname: Chiba
authors.forename: Tomonori
authors.initials: T
authors.lastname: Tateishi
mesh_terms: D014150:Antipsychotic Agents / Q000097:blood* / Q000493:pharmacokinetics; D001331:Automation; D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation / Q000379:methods*; D006220:Haloperidol / Q000031:analogs & derivatives* / Q000097:blood* / Q000493:pharmacokinetics; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet
chemical_list: D014150:Antipsychotic Agents; D006220:Haloperidol; C006820:bromperidol