Voltammetric, spectrofluorimetric and spectrophotometric methods to determine flufenamic acid

Journal of Pharmaceutical and Biomedical Analysis
S M Sabry, H Mahgoub


Simple, rapid and sensitive voltammetric, spectrofluorimetric and spectrophotometric methods for determination of flufenamic acid (FF) in bulk powder and capsule dosage form are presented. The methods are based on the cyclisation reaction of FF with concentrated sulphuric acid to produce the corresponding acridone derivative. The voltammetric method is based on the adsorptive stripping differential pulse (DP) technique. The acridone derivative is determined over the concentration range of 8-60 ng ml(-1) using adsorptive preconcentration at the hanging mercury drop electrode (HMDE). The lower detection limit was found to be 1.02 ng ml(-1). The fluorimetric and spectrophotometric methods are based on the measurement of the fluorescence intensity at 450 nm (lambda(ex) = 400 nm)and peak-to-peak measurements of the first- (D1) and second-derivative (D2) curves, respectively. Beer's law is obeyed over the concentration ranges of 2-20 ng ml(-1) and 0.2-8.0 microg ml(-1) for the fluorimetric and spectrophotometric measurements, respectively. The three methods were proved to be accurate and reproducible as indicated by a relative standard deviation of <2%.


Mar 1, 1987·Proceedings of the National Academy of Sciences of the United States of America·L AslundU Pettersson
Aug 1, 1995·Journal of Pharmaceutical and Biomedical Analysis·M I AlberoM S Garcia
Apr 12, 1996·Journal of Chromatography. B, Biomedical Applications·D CerretaniG Giorgi

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