Author(s): Pasupuleti Sunitha*, Avanti mallem, Vijaya kuchana
A new stability-indicating method was established for the estimation of Rifaximin by RP-HPLC The chromatographic conditions were successfully developed for the estimation of Rifaximin by using symmetryC18 column (150×4.6mm,5μ), flow rate of 1ml/min, mobile phase ratio used was (65:35 v/v) methanol: phosphate buffer pH 3 (pH was adjusted with orthophosphoric acid),detection was carried at 454nm. The Retention time was found to be 2.262mins. The Proposed stability indicating HPLC method was validated as per ICH guidelines and can be applied for the determination of Rifaximin in Pharmaceutical dosage forms. The methodwas found to be accurate, precise, robust and specific. As the drug peak elution did not interfere with any degradants during the forced degradation studies and therefore the proposed method can be successfully applied to perform long-term and acceleratedstability studies of Rifaximin formulation.