combined dosage forms

A new, simple, rapid, selective, precise and accurate isocratic reverse phase high performance liquid Chromatography assay method has been developed for simultaneous estimation of Isoniazid and Pyridoxine tablet formulations. The separation was achieved by using column Hypersil BDS, (250 x 4.6 mm, 5 µ) (Make: Thermo), in mobile phase consisted of pH4.0 phosphate buffer and Acetonitrile in the ratio of 75:25 v/v. The flow rate was 1.0 mL/min, column oven temperature 30° C, the injection volume was 10 μL, and detection was performed at 267 nm using a photodiode array detector (PDA), Run time 6 minutes. The retention time of Isoniazid and Pyridoxine, was noted to be 3.5 minutes and 4.3 minutes respectively, indicative of rather shorter analysis time. The method was validated as per ICH guidelines. The proposed method was found to be accurate, reproducible, and consistent.