title: Simultaneous quantification of rosiglitazone and its two major metabolites, N-desmethyl and p-hydroxy rosiglitazone in human plasma by liquid chromatography/tandem mass spectrometry: application to a pharmacokinetic study.
abstract: We present a simple, rapid, and sensitive liquid chromatography (LC)-tandem mass spectrometry (MS/MS) method for the simultaneous quantification of rosiglitazone and its two major metabolites via CYP2C8/9, N-desmethyl and p-hydroxy rosiglitazone, in human plasma. The procedure was developed and validated using rosiglitazone-d(3) as the internal standard. Plasma samples (0.1 ml) were prepared using a simple deproteinization procedure with 0.2 ml of acetonitrile containing 40 ng/ml of rosiglitazone-d(3). Chromatographic separation was carried out on a Luna C18 column (100 mm x 2.0 mm, 3-microm particle size) using an isocratic mobile phase consisting of a 60:40 (v/v) mixture of acetonitrile and 0.1% formic acid((aq)). Each sample was run at 0.2 ml/min for a total run time of 2.5 min per sample. Detection and quantification were performed using a mass spectrometer in selected reaction-monitoring mode with positive electrospray ionization at m/z 358.1-->135.1 for rosiglitazone, m/z 344.2-->121.1 for N-desmethyl rosiglitazone, m/z 374.1-->151.1 for p-hydroxy rosiglitazone, and m/z 361.1-->138.1 for rosiglitazone-d(3). The linear ranges of concentration for rosiglitazone, N-desmethyl rosiglitazone, and p-hydroxy rosiglitazone were 1-500, 1-150, and 1-25 ng/ml, respectively, with a lower limit of quantification of 1 ng/ml for all analytes. The coefficient of variation for assay precision was less than 14.4%, and the accuracy was 93.3-112.3%. No relevant cross-talk and matrix effect were observed. This method was successfully applied to a pharmacokinetic study after oral administration of a 4-mg rosiglitazone tablet to healthy male Korean volunteers.
authors.affiliation: Department of Pharmacology and PharmacoGenomics Research Center, Inje University College of Medicine, Busan, South Korea.
authors.forename: Kwon-Bok
authors.initials: KB
authors.lastname: Kim
authors.forename: Dong Jun
authors.initials: DJ
authors.lastname: Lee
authors.forename: Chang-Woo
authors.initials: CW
authors.lastname: Yeo
authors.forename: Jae-Gook
authors.initials: JG
authors.lastname: Shin
authors.forename: Soo Kyung
authors.initials: SK
authors.lastname: Bae
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods*; D006801:Humans; D007004:Hypoglycemic Agents / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics; D008297:Male; D000077154:Rosiglitazone; D053719:Tandem Mass Spectrometry / Q000379:methods*; D045162:Thiazolidinediones / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics
chemical_list: D007004:Hypoglycemic Agents; D045162:Thiazolidinediones; D000077154:Rosiglitazone