Development and validation of a fast, simple, cost-effective and robust HPLC method for lisinopril determination in solid pharmaceutical dosage forms
Keywords:lisinopril dihydrate, tablets, HPLC, optimization, validation
A fast, simple, cost-effective and robust chromatographic method was developed and validated for determination of the antihypertensive drug lisinopril dihydrate in tablets under routine operational conditions, without ion-pair reagents, high column temperatures and an acidic mobile phase. Taking into consideration all four different pKa values of lisinopril, the separation was optimized using the C18 column (end-capped, 150 mm × 4.6 mm 5 µm) and a mobile phase composed of methanol and ammonium (or potassium) dihydrogen phosphate buffer (pH 7.2) with a flow rate of 1.1 ml/min, UV detection at 214 nm and a temperature of 40 °C. These optimized conditions led to the production of a single and symmetrical peak for lisinopril. This mobile phase is suitable for different HPLC columns, which makes it appropriate for industrial quality control laboratories. The developed method was validated, showing excellent validation results and the possibility to be implemented for the determination of lisinopril in combined dosage forms with other active substances.
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