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AAPS PharmSciTech. 2005 September; 6(3): E543–E551.
Published online 2005 October 27. doi:  10.1208/pt060368
PMCID: PMC2750402

Kinetic spectrophotometric method for the determination of ramipril in pharmaceutical formulations


The objective of this research was to develop a kinetic spectrophotometric method for determination of ramipril in pure form and pharmaceutical formulations. The method was based on the reaction of carboxylic acid group of the drug with a mixture of potassium iodate (KIO3) and potassium iodide (KI) in aqueous medium at room temperature. The reaction is followed spectrophotometrically by measuring the increase in absorbance at 352 nm as a function of time. The initial-rate and fixed-time methods were adopted for constructing the calibration curves. Both the calibration curves were linear in the concentration range of 10.0–70.0 μg mL−1. The detection limits were 0.02μg mL−1 and 0.15-μg mL−1 for initial rate and fixed time methods, respectively. The proposed methods are validated statistically and through recovery studies. The point and interval hypothesis tests have been performed confirming that there is no significant difference between the proposed methods and the reference method. The experimental true bias of all samples is less than ±2%. The methods have been successfully applied to the determination of ramipril in tablets and capsules.

Keywords: initial-rate method, fixed-time method, ramipril, pharmaceutical formulations, spectrophotometry, validation

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Selected References

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