title: Selective determination of sultopride in human plasma using high-performance liquid chromatography with ultraviolet detection and particle beam mass spectrometry.
abstract: We developed a sensitive and selective method for determining levels of sultopride, a neuroleptic drug of the substituted benzamide, in human plasma using high-performance liquid chromatography (HPLC) combined with UV detection and particle beam mass spectrometry (PBMS). Sultopride was extracted with tert.-butylmethyl ether using a salting-out technique. Tiapride served as an internal standard (I.S.). Sultopride and I.S. were separated by HPLC on a silica column with a mobile phase of acetonitrile-0.1 M ammonium acetate (94:6, v/v). The calibration curves were linear over the concentration range from 5 to 1000 ng/ml by HPLC with UV detection and from 10 to 1000 ng/ml with PBMS detection. The limit of quantitation was 5 ng/ml with UV detection and 10 ng/ml with PBMS detection. The absolute recovery was 92% and the within-day coefficients of variation were 2.9-7.1% at plasma concentrations from 50 to 500 ng/ml, determined by HPLC with UV detection. Using this method, we measured the plasma concentrations of sultopride with replicate analyses in four hospitalized patients and steady-state plasma levels were determined to be 161.6 +/- 30.8, 321.1 +/- 93.7, 726.5 +/- 143.1 and 1273.6 +/- 211.2 ng/ml, respectively.
authors.affiliation: Department of Forensic Medicine, Faculty of Medicine, Kyushu University, Fukuoka, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Jitsufuchi
authors.forename: K
authors.initials: K
authors.lastname: Kudo
authors.forename: H
authors.initials: H
authors.lastname: Tokunaga
authors.forename: T
authors.initials: T
authors.lastname: Imamura
mesh_terms: D000328:Adult; D000368:Aged; D000077582:Amisulpride; D014150:Antipsychotic Agents / Q000097:blood*; D002851:Chromatography, High Pressure Liquid; D006801:Humans; D008297:Male; D013058:Mass Spectrometry; D008875:Middle Aged; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet; D013469:Sulpiride / Q000031:analogs & derivatives* / Q000097:blood
chemical_list: D014150:Antipsychotic Agents; D013469:Sulpiride; D000077582:Amisulpride