Validation and Stability Indicating RP‐HPLC Method for the Determination of Sildenafil Citrate in Pharmaceutical Formulations and Human Plasma

Abstract

A simple, selective, accurate reverse phase‐high performance liquid chromatographic (RP‐HPLC) method was developed and validated for the analysis of sildenafil citrate in pharmaceutical formulations. Chromatographic separation achieved isocratically on a C 18 column (Use Inertsil C 18 , 5μ , 150 mm x 4.6 mm) utilizing a mobile phase of acetonitrile/phosphate buffer (70:30, v/v, pH 7.0) at a flow rate of 0.8 mL/m with UV detection at 228 nm. The retention time was 4.087. The method is accurate (99.15‐101.85%), precise (intra‐day variation 0.13‐1.56% and inter‐day variation 0.30‐1.60%) and linear within range 0.1‐30 μg/mL (R 2 =0.999) concentration and was successfully used in monitoring left over drug. The detection limit of sildenafil citrate at a signal‐to‐noise ratio of 3 was 1.80 ng/mL in human plasma while quantification limit in human serum was 5.60 ng/mL. The proposed method is applicable to stability studies and routine analysis of sildenafil citrate in pharmaceutical formulations as well as in human plasma samples.