title: Enantioselective high-performance liquid chromatographic determination of nicardipine in human plasma.
abstract: A sensitive method for the enantioselective high-performance liquid chromatography (HPLC) determination of nicardipine in human plasma is described. (+)-Nicardipine, (-)-nicardipine and (+)-barnidipine as an internal standard are detected by an ultraviolet detector at 254 nm. Racemic nicardipine in human plasma was extracted by a rapid and simple procedure based on C18 bonded-phase extraction. The extraction samples were purified and concentrated on a pre-column using a C1 stationary phase and the enantiomers of nicardipine are quantitatively separated by HPLC on a Sumichiral OA-4500 column, containing a chemically modified Pirkle-type stationary phase. Determination of (+)- and (-)-nicardipine was possible in a concentration range of 5-100 ng ml(-1) and the limit of detection in plasma was 2.5 ng ml(-1). The recoveries of (+)- and (-)-nicardipine added to plasma were 91.4-98.4% and 93.3-96.7%, respectively, with coefficients of variation of less than 9.0 and 9.4% respectively. The method was applied to low level monitoring of (+)- and (-)-nicardipine in plasma from healthy volunteers.
authors.affiliation: Department of Pharmacy, Hirosaki University Hospital, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Uno
authors.forename: T
authors.initials: T
authors.lastname: Ohkubo
authors.forename: K
authors.initials: K
authors.lastname: Sugawara
mesh_terms: D002121:Calcium Channel Blockers / Q000097:blood* / Q000493:pharmacokinetics; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006801:Humans; D009529:Nicardipine / Q000097:blood* / Q000493:pharmacokinetics; D012016:Reference Values; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013237:Stereoisomerism; D014665:Vasodilator Agents / Q000097:blood* / Q000493:pharmacokinetics
chemical_list: D002121:Calcium Channel Blockers; D014665:Vasodilator Agents; D009529:Nicardipine