Objective: The objective of the current work is to develop and validate a simple yet effective, efficient and reproducible RP-UHPLC method for the determination of Gilcazide loaded in a microsphere formulation. Methods: The chromatographic analysis was carried out on Thermo Scientific (Dionex Ultra 3000plus) UHPLC using a stainless steel YMC C8 column (25cm × 4mm) packed with endcapped octylsilane bonded to porous silica (4µm) in isocratic elution mode using phosphate buffer pH 3.4 and HPLC grade acetonitrile in the ratio of 20: 80 (v/v) as eluent. The flow rate was adjusted as 1ml/min and eluent was detected at 230 nm. The retention time was observed at 1.9 min. Results: The linear dynamic range for the developed UHPLC method was found in the concentration range of 2-10µg/ml and percentage recovery was in the range of 94%-98%. Drug Entrapment Efficiency Data of Gliclazide loaded microsphere was found to be 93.72% Conclusion: In this RP–UHPLC method, the linearity was within the range of 2–10μg/mL and the validation parameters were within the limits was performed as per ICH guidelines. The % Drug entrapment Efficiency of the Gliclazide loaded microsphere was found to be 93.72 % which was satisfactory.

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