Three sensitive and accurate spectrophotometric methods have been developed for the assay of enalapril maleate and ramipril, each in its dosage forms. These methods depend on the reaction of the drugs with p-chloranilic acid, the reaction with picric acid, and the ion-pair salt formation with bromocresol green. The proposed methods have been applied to the analysis of these drugs in their commercial tablets. The results obtained were precise and accurate.
Blaih, Salah; Abdine, Heba H; El-Yazbi, Fawzy A; Shaalan, Rasha A (1999). Spectrophotometric Determination of Enalapril Maleate and Ramipril in Dosage Forms. Spectroscopy Letters 33(1) 91-102. doi: http://dx.doi.org/10.1080/00387010009350061. Retrieved from https://oaks.kent.edu/chempubs/35