Reversed-Phase Liquid Chromatographic Internal Standard Method Using Losartan Potassium for Quantitative Estimation of Ivabradine Hydrochloride in Pharmaceutical Tablet Dosage Form and Plasma

A reversed-phase liquid chromatographic method for ivabradine hydrochloride using Diode Array Detector (DAD) and internal standard technique was developed and validated according to ICH and SWGTOX guidelines. The prime objective of this study was to develop a precise and accurate method that can be equally applicable to biological (plasma) as well as non-biological (active pharmaceutical ingredient and pharmaceutical tablets) matrices. Losartan potassium was used as an internal standard due to its easy availability. After liquid-liquid extraction using acetonitrile, the ivabradine hydrochloride and internal standard were chromatographed on Agilent 1200 series HPLC system equipped with DAD detector, auto-sampler and chemstation software. Analytical separation was achieved on Agilent C-18 (5µm, 25cm x 4.6mm) reversed-phase column at 30°C column oven temperature, 10μL injection volume and 286nm wavelength. Isocratic mobile phase system comprised of 60:40 v/v ratio of HPLC grade methanol and water adjusted to pH 6.8 using orthophosphoric acid was employed with 1mL/min flow rate. The method linear range was 0.025-3µg/mL (25-3000ng/mL) for pharmaceutical tablets and plasma with the coefficient of linearity ranged 0.997-0.999. Results for precision, accuracy, recovery, stability and matrix effect studies were within acceptable limits for both plasma and tablets. Method was successfully applied to the commercial tablet products and patient plasma samples to estimate the amount of ivabradine hydrochloride.