TITRIMETRIC AND SPECTROPHOTOMETRIC DETERMINATION OF MEBENDAZOLE AND FLUBENDAZOLE USING N-BROMOSUCCINIMIDE

Document Type : Original Article

Authors

Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Assiut University, Assiut, Egypt

Abstract

Titrimetric and spectrophotometric determination methods are described for mebendazole and flubendazole in dosage forms.
The first method depends upon addition of an excess of standard N-bromosuccinimide (NBS) and after the specified time, the residual reagent is determined iodometrically. This procedure permits semi-micro determination (3-30 mg) of the drug.
An alternative procedure involves measurement of the colour produced after reaction with N-bromosuccinimide (lmax 465 nm). The stoichiometry of the reaction was studied and found 1:1 for mebendazole-
NBS and 1:2 for flubendazole-NBS. The methods were applied successfully for the analysis of either of the two drugs in some formulations. Average recoveries ranging from 98.70±1.64 to 101.94±0.82 for titrimetric and from 97.5 ± 0.65 to 101.30± 0.55 for spectrophotometric methods were obtained. The methods were compared with U.S.P. XX method in case of mebendazole and were found in good agreement.