Table of Contents
Chromatography Research International
Volume 2014, Article ID 258125, 8 pages
http://dx.doi.org/10.1155/2014/258125
Research Article

A Stability-Indicating High Performance Liquid Chromatographic Assay for the Simultaneous Determination of Pyridoxine, Ethionamide, and Moxifloxacin in Fixed Dose Combination Tablets

Department of Pharmaceutics, Faculty of Pharmacy, University of Karachi, Karachi 75270, Pakistan

Received 13 December 2013; Revised 17 February 2014; Accepted 12 March 2014; Published 23 April 2014

Academic Editor: Irene Panderi

Copyright © 2014 Munib-ur-Rehman et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Stability indicating reversed phase HPLC method was developed and validated for the simultaneous quantitation of antitubercular drugs, ethionamide (ETH), and moxifloxacin (MOX) with commonly coprescribed vitamin, pyridoxine (PYR) in tablet dosage form. The method was found rapid, precise and accurate. The separation was performed in Hibar 150-4.6, Purospher STAR, RP-18e (5 μm) column, using mobile phase A (0.03 M sodium citrate adjusted to pH 5 with glacial acetic acid) and mobile phase B (100% methanol), ran at variable proportions at flow rate of 1.0 mL/min. The detection was carried out at 320 nm. The method was observed linearly in the range of 2.5–17.5 μg/mL for PYR, 25–175 μg/mL for ETH, and 40–280 μg/mL for MOX with respective limits of detection/quantitation of 0.125 μg/mL/1.28 μg/mL, 0.25 μg/mL/2.56 μg/mL, and 0.35 μg/mL/3.65 μg/mL. The drugs were also subjected to oxidative, hydrolytic, photolytic, and thermal degradation; the degradation products showed interference with the detection of PYR, ETH, and MOX. The proposed method was observed to be effective to quantitate MOX (400 mg), ETH (250 mg), and PYR (25 mg) in fixed dose combination tablet formulation.