LC determination of rosiglitazone in bulk and pharmaceutical formulation.

An isocratic reversed phase liquid chromatographic (RP-LC) method has been developed and subsequently validated for the determination of rosiglitazone and its related impurities. Separation was achieved with a Symmetry C18 column and sodium phosphate buffer (pH adjusted to 6.2):acetonitrile (50:50, v/v) as eluent, at a flow rate of 1.0 ml/min. UV detection was performed at 245 nm. The method is simple, rapid, selective and stability indicating. Indole was used as internal standard for the purpose of quantification of rosiglitazone. The described method is linear over a range of 0.45-10 microg/ml for related impurities and 180-910 microg/ml for assay of rosiglitazone. The method precision for the determination of assay and related compounds was below 1.0 and 3.6% RSD, respectively. The mean recoveries of impurities were found to be in the range of 95-102%. The percentage recoveries of Active Pharmaceutical Ingredient (API) from dosage forms ranged from 99.02 to 101.30. The method is useful in the quality control of bulk manufacturing and also in pharmaceutical formulations.