Development and validation of a HPLC-UV method for the determination in didanosine tablets

A simple, rapid, sensitive and specific reversed-phase high performance liquid chromatographic method involving ultraviolet detection (HPLC-UV) was developed for analysis of didanosine in drug substance and formulated products, tablets. Chromatography was carried out on a pre-packed, Lichrospher 100 Rp-8 (5.0 μm, 250 mm × 4.0 mm) column using 0.01 M sodium acetate solution:methanol (85:15, v/v) adjusted to pH 6.5 with acetic acid as mobile phase at a flow rate of 1.5 ml/min and a 248 nm detection. Hypoxantine was confirmed as the main degradation product. The assay was linear over the concentration range of 50-150 μg/ml (R ≈ 0.999). The method was validated for accuracy and precision.