A new approach to the spectrophotometric determination of metronidazole and tinidazole using p-dimethylaminobenzaldehyde

Acta Pharmaceutica : a Quarterly Journal of Croatian Pharmaceutical Society and Slovenian Pharmaceutical Society, Dealing with All Branches of Pharmacy and Allied Sciences
Olajire Aremu Adegoke, Offiong Edet Umoh

Abstract

A new approach to the spectrophotometric determination of metronidazole (MZ) and tinidazole (TZ) has been developed. The procedure involves coupling of diazotized nitroimidazoles with p-dimethylaminobenzaldehyde (DMAB) to form a greenish-yellow solution. Optimal temperature and time were 0 degrees C (iced) and 3 minutes for diazotization and 30 degrees C and 2 minutes for coupling for both MZ and TZ. Coloured adducts of MZ and TZ showed shoulders at 406 nm and 404 nm, respectively, which were selected as analytical wavelengths. The reaction with p-DMAB occurred in a 1:1 mole ratio. Beer's law was obeyed within the 4.8-76.8 microg mL(-1) concentration range with low limits of detection. The azo adducts were stable for over a week. Molar absorptivities were 1.10 x 10(3) (MZ) and 1.30 x 10(3) L mol(-1) cm(-1) (TZ). Overall recoveries of MZ and TZ from quality control samples were 103.2 + or - 1.3 and 101.9 + or - 1.3% over three days. There was no interference from commonly utilized tablet excipients. No significant difference was obtained between the results of the new method and the BP titrimetric procedures. The azo approach using the p-dimethylaminobenzaldehyde procedure described in this paper is simple, fast, accurate and pr...Continue Reading

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Citations

Dec 15, 2015·Materials Science & Engineering. C, Materials for Biological Applications·Hafedh Belhadj AmmarYoussef Samet
May 3, 2016·Saudi Pharmaceutical Journal : SPJ : the Official Publication of the Saudi Pharmaceutical Society·Madan Lal MaheshwariM Khan Leghari

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