title: Analysis of mesocarb analogues in urine and plasma of rats by high-performance liquid chromatography and thermospray liquid chromatography-mass spectrometry.
abstract: The pharmacokinetics and metabolism of synthetic 2-hydroxymesocarb and 4-methyl-2-hydroxymesocarb analyzed by HPLC-DAD and thermospray LC-MS were studied in rats. Multistep liquid-liquid extraction (LLE) was used with diethyl ether at pH 7.0. The major metabolites of 2-hydroxymesocarb in both urine and plasma of the rat were the p-hydroxylated derivative of the phenylcarbamoyl group of the parent drug. The metabolites of 4-methyl-2-hydroxymesocarb in urine of rats may be the oxidized forms at the phenylcarbamoyl group of the parent drug. Absorption (ka) and elimination (ke) rate constants in plasma of 2-hydroxy-mesocarb were 0.0300 and 0.00485 min-1, respectively; those of 4-methyl-2-hydroxymesocarb were 0.0546 and 0.00797 min-1, respectively. The half-lives (t1/2) of 2-hydroxymesocarb and 4-methyl-2-hydroxymesocarb in plasma were 144 and 86 min, respectively.
authors.affiliation: Doping Control Center, Korea Institute of Science and Technology, Cheongryang, Seoul, South Korea.
authors.forename: H
authors.initials: H
authors.lastname: Pyo
authors.forename: S J
authors.initials: SJ
authors.lastname: Park
authors.forename: J
authors.initials: J
authors.lastname: Park
authors.forename: J K
authors.initials: JK
authors.lastname: Yoo
authors.forename: B
authors.initials: B
authors.lastname: Yoon
mesh_terms: D000818:Animals; D002138:Calibration; D000697:Central Nervous System Stimulants / Q000032:analysis* / Q000097:blood / Q000493:pharmacokinetics / Q000652:urine; D002851:Chromatography, High Pressure Liquid; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D051381:Rats; D013558:Sydnones / Q000032:analysis* / Q000097:blood / Q000493:pharmacokinetics / Q000652:urine
chemical_list: D000697:Central Nervous System Stimulants; D013558:Sydnones; C009257:sidnocarb