Application of RP-HPLC for the Estimation of Allopurinol and Its Related Substances in Bulk and Tablet Dosage Form

Aims: The main aim of the present study was to develop and validate a simple and cost- effective method for the estimation of allopurinol and its related substances by using RP-HPLC.

Study Design: Estimation of Allopurinol and its related substance in bulk and tablet dosage forms by RP-HPLC.

Place and Duration of Study: Chalapathi Drug Testing Laboratory, Chalapathi Institute of Pharmaceutical Sciences, Chalapathi Nagar, Lam, Guntur-522034 between October 2020 to January 2021.

Methodology: Method development was carried out by using Schimadzu, Prominence-i series LC 3D-Plus autosampler embedded with lab solutions software, equipped with PDA detector using YMC column (150 mm X 4.6 mm, 3 μm) and 0.1M Ammonium acetate buffer as a mobile phase in the ratio of 100% at a flow rate of 1.0 ml/min at a wavelength of 255nm. The developed method was validated according to ICH guidelines.

Results: The linearity was observed in the range of 20-100 µg/ml with a regression (R2) value of 0.999. Developed method was specific with no interactions and accurate with 100.11% for allopurinol and 99.54% for its related substance. The limit of detection for allopurinol was 2 µg/ml and for related substance was 0.0.1 µg/ml. The limit of quantification for allopurinol was 6 µg/ml and for related substance was 0.03 µg/ml respectively. The percentage relative standard deviation was found to be NMT 2 which indicates that the proposed method was precise and robust.

Conclusion: The developed method was simple, precise and accurate and can be successfully employed for the estimation of allopurinol in bulk and tablet dosage form.