Determination of Benazepril and Cilazapril in Pharmaceuticals by High Performance Liquid Chromatography

Abstract
A high performance liquid chromatography method was developed for the specific determination of new angiotensin-converting enzyme inhibitors benazepril and cilazapril in pharmaceutical dosage forms. The proposed method was conducted using a reverse phase technique, UV monitoring at 211 nm and enalapril as an internal standard. The detector response was linear in the range of 10–50 μg/mL for benazepril and 40–200 μg/mL for cilazapril. The drugs were extracted from tablets with methanol. The percentage recoveries ranged from 96.34 to 102.04 and from 103.08 to 107.96 for benazepril and cilazapril, respectively.