Abstract

KHATTAB, F.I.; RAMADAN, N.K.; HEGAZY, M.A.  and  GHONIEM, N.S.. Microsized Graphite Sensors for Potentiometric Determination of Metronidazole and Spiramycin. Port. Electrochim. Acta [online]. 2011, vol.29, n.2, pp.79-90. ISSN 0872-1904.

Two microsized graphite-design sensors based on ionophore technique, polyvinyl chloride carboxylated (PVC-COOH) and β-cyclodextrin (b-CD), are used for fabrication of two membrane sensors for the two studied drugs, metronidazole (MZ), sensor 1, and spiramycin (SP), sensor 2. Fast and stable Nernstian responses near 1x10^-5 - 1x10^-3 M for MZ and 1x10^-5-1x10^-2 M for SP over pH range 5.5-7.5 for the two electrodes reveal the performance characteristics of these electrodes which have been evaluated according to IUPAC recommendations. The aim of this work is to develop a new, simple, accurate and precise method for the determination of MZ and SP in their binary mixtures, which can be applied in routine quality control.  The method is successively applied for the determination of the two drugs in their pharmaceutical formulations. Validation of the method according to the quality assurance standards shows suitability of the proposed electrodes for the use in the quality control assessment of these drugs. The recovery percentages for the determination of the two drugs by the two proposed selective electrodes are 99.86 ± 0.249 % and 99.69 ± 0.856% for sensors 1 and 2, respectively. Statistical comparison between the results obtained by this method and the reported one is done and no significant difference is found.

Keywords : metronidazole (MZ); spiramycin (SP); poly(vinyl chloride) carboxylated PVC-COOH; -cyclodextrin (b-CD); pharmaceutical formulations.

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