title: Determination of the enantiomers of a new 1,4-dihydropyridine calcium antagonist in dog plasma by achiral/chiral coupled high-performance liquid chromatography with electrochemical detection.
abstract: An achiral/chiral coupled high-performance liquid chromatographic method with electrochemical detection was developed for the determination of the enantiomers of a new dihydropyridine calcium blocker, methyl (+-)-4,7-dihydro-3-isobutyl-6-methyl-4-(3-nitrophenyl)- thieno[2,3-b]pyridine-5-carboxylate (1), in dog plasma. The assay showed linearity over the range 1-200 ng/mL for the two enantiomers. The limit of determination was 1 ng/mL for each analyte. The assay precision was < 9%, with relative errors of -5.7 to +6.9% at 3 and 30 ng/mL levels of both the enantiomers. The method was applied to a pharmacokinetic study of the enantiomers of 1 in beagle dogs after oral administration of racemic 1.
authors.affiliation: Shionogi Research Laboratories, Shionogi & Company, Ltd., Osaka, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Fujitomo
authors.forename: I
authors.initials: I
authors.lastname: Nishino
authors.forename: K
authors.initials: K
authors.lastname: Ueno
authors.forename: T
authors.initials: T
authors.lastname: Umeda
mesh_terms: D000818:Animals; D002121:Calcium Channel Blockers / Q000097:blood* / Q000493:pharmacokinetics; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004095:Dihydropyridines / Q000097:blood* / Q000493:pharmacokinetics; D004285:Dogs; D004563:Electrochemistry; D013237:Stereoisomerism
chemical_list: D002121:Calcium Channel Blockers; D004095:Dihydropyridines; C059447:S 312