title: Simultaneous determination of olanzapine, clozapine and demethylated metabolites in serum by on-line column-switching high-performance liquid chromatography.
abstract: An automated method for simultaneous routine quantification of the antipsychotic drugs clozapine, olanzapine and their demethylated metabolites is described. The method included adsorption on a cyanopropyl (CPS) coated clean-up column (10 microm; 10 x 2.0 mm I.D.), washing off interfering serum constituents to waste, and separation on C18 ODS Hypersil reversed phase material (5 microm; 250 x 4.6 mm I.D.) using acetonitrile-water-tetramethylethylenediamine (37:62.6:0.4, v/v/v) adjusted to pH 6.5 with concentrated acetic acid. UV-detection was performed at 254 nm. The limit of quantification was 10-20 ng/ml. Relative day to day standard variations ranged between 4.5 and 13.5%. The method is suitable for routine monitoring of olanzapine and clozapine including their demethylated metabolites.
authors.affiliation: Department of Psychiatry, University of Mainz, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Weigmann
authors.forename: S
authors.initials: S
authors.lastname: Härtter
authors.forename: S
authors.initials: S
authors.lastname: Maehrlein
authors.forename: W
authors.initials: W
authors.lastname: Kiefer
authors.forename: G
authors.initials: G
authors.lastname: Krämer
authors.forename: G
authors.initials: G
authors.lastname: Dannhardt
authors.forename: C
authors.initials: C
authors.lastname: Hiemke
mesh_terms: D014150:Antipsychotic Agents / Q000097:blood*; D001569:Benzodiazepines; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003024:Clozapine / Q000097:blood*; D006801:Humans; D000077152:Olanzapine; D010890:Pirenzepine / Q000031:analogs & derivatives* / Q000097:blood*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet
chemical_list: D014150:Antipsychotic Agents; D001569:Benzodiazepines; D010890:Pirenzepine; D003024:Clozapine; D000077152:Olanzapine