title: [Determination of amlodipine in CYP3A4 cDNA-expressed cells by HPLC].
abstract: To establish a RP-HPLC method for the determination of amlodipine after metabolism by cytochrome P450 cDNA-expressed cells.
  
  
  
  The determination was performed on a C(18) reversed phase column with a mobile phase composed of acetonitrile phosphates buffer (45:55, v/v, pH 4.5) with UV detection (lambda250nm). Propranolol was used as the internal standard.
  
  
  
  The standard curve was linear over the concentration range of 0.2 - 30.0 microg/ml (r=0.9993), and the limits of determination was 20 ng/ml (S/N >or=3), the limits of quantity was 0.2 microg/ml (recovery 104.0%, RSD 11.4%, n=5). The recovery for this assay was (98.2+/-2.4)%, precision for inter-assay and intra-assay was <10 % and 6 %, respectively.
  
  
  
  The HPLC method established is simple, accurate and suitable for the determination of amlodipine in cytochrome p450 cDNA-expressed cells.
authors.affiliation: Department of Pharmaceutical Analysis and Drug Metabolism, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310031, China.
authors.forename: Yong-jiang
authors.initials: YJ
authors.lastname: Wu
authors.forename: Yun-xue
authors.initials: YX
authors.lastname: Pan
authors.forename: Su
authors.initials: S
authors.lastname: Zeng
mesh_terms: D017311:Amlodipine / Q000032:analysis* / Q000378:metabolism; D002121:Calcium Channel Blockers / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid; D051544:Cytochrome P-450 CYP3A; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics / Q000502:physiology*; D006801:Humans; D014162:Transfection
chemical_list: D002121:Calcium Channel Blockers; D017311:Amlodipine; D003577:Cytochrome P-450 Enzyme System; C104464:CYP3A protein, human; D051544:Cytochrome P-450 CYP3A; C510163:CYP3A4 protein, human