A rapid, simple and stability-indicating high-performance liquid chromatography assay method was developed and validated for quantitative analysis of lapatinib (LPT) in bulk pharmaceuticals. The newly developed method was assessed using a C18 MZ-Analytical column (5 µm, 150 × 4.6 mm, OSD-3), which was protected by a (5 µm, 4.0 × 4.6 mm, OSD-3) pre-column with mobile phase that was composed of acetonitrile and water (70/30, v/v) and a detection wave length of 227 nm. The method was validated according to the ICH guidelines with respect to precision, accuracy, linearity, robustness, specificity and system suitability. Forced degradation studies were also performed for LPT to determine the stability-indicating aspect of developed method. The method was found to be specific for LPT in the presence of degradation products. The retention time of LPT was ∼4 min. Accuracy of the method was found to be 2.20% bias for all tested samples. The inter- and intra-day precision of the novel method were found to be 2.84 and 2.78%, respectively. The calibration curve was linear over the concentration range of 5-80 µg/mL with a regression coefficient of 0.9990. The limits of detection and quantification were also found to be 1 and 5 µg/mL, respectively. Mass spectrometry analysis was performed in order to better characterize degraded products.
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