title: High-performance liquid chromatographic method for quantitative determination of amlodipine in human plasma and pharmaceutical dosage form and its application to pharmacokinetic studies.
abstract: An accurate, sensitive, and reproducible high-performance liquid chromatographic method for the quantitation of amlodipine besylate in human plasma has been developed and validated. The drug, internal standard, and major metabolite were eluted from a C(18) hypersil HyPurity column (3 microm, 3.9 mm i.d. x 150 mm) at room temperature with a mobile phase consisting of acetonitrile-potassium dihydrogen phosphate buffer (0.05 M) and acetic acid (62:38:0.1) with the pH adjusted to 3.5 using phosphoric acid. The flow-rate was 1.8 mL/min. The limit of detection was 1.0 ng/mL, and the limit of quantification of amlodipine besylate in plasma was 10 ng/mL. The intra- and inter-day precisions showed coefficients of variation ranging from 5.98-11.4% and from 5.60-11.74%, respectively at three different levels of concentration. The averages of the absolute and relative recoveries were found to be 96.74-98.51% and 95.96-100.71%, respectively. Stability studies showed that amlodipine besylate is stable for at least 2 months in plasma after freezing at -20 degrees C. The method was successfully applied for a pharmacokinetic study and for the determination of commercial amlodipine tablet content.
authors.affiliation: Department of Pharmaceutics, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia. ialsarra@ksu.edu.sa
authors.forename: Ibrahim A
authors.initials: IA
authors.lastname: Alsarra
mesh_terms: D017311:Amlodipine / Q000097:blood* / Q000493:pharmacokinetics; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006801:Humans; D004364:Pharmaceutical Preparations / Q000032:analysis*; D010599:Pharmacokinetics; D013607:Tablets
chemical_list: D004364:Pharmaceutical Preparations; D013607:Tablets; D017311:Amlodipine