Spectrophotometric investigations on protolytic equilibria of mefenamic acid and determination by means of Fe(III) in methanol—aqueous media

Indirect spectrophotometric method for the determination of bisacodyl in commercial dosage forms and in environmental water samples

“…Buffer solution (pH3), this solution was prepared by mixing 16.2 ml of 0.1 M chloroacetic acid with 8.8 ml of 0.1 M KOH, then the volume was completed to 100 ml with distilled water in a volumetric flask 12 . Recommended procedure A known volume of sample containing 12.5-125 µg of bisacodyl was transferred into a 25 ml calibrated flasks followed by addition of 1 ml of ferric chloride solution then 2 ml of buffer solution pH3 .The solution was mixed well and then heated in a water bath at 70 2 ºC for 15 min.…”

Design and application of potentiometric sensors for the determination of mefenamic and phenylanthranilic acids

“…It is oen used as an indicator for redox reactions. 17 Modern scientic literature reports various methods for the determination of mefenamic acid in pharmaceuticals, [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]42,44 biological liquids, 33,[45][46][47][48][49][50] and the environment. 51,52 Methods are mainly based on spectrophotometric [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] and chromatographic techniques 28,…”

“…Modern scientific literature reports various methods for the determination of mefenamic acid in pharmaceuticals, 18–34,42,44 biological liquids, 33,45–50 and the environment. 51,52 Methods are mainly based on spectrophotometric 18–37 and chromatographic techniques 28,29,38,46–49,51 (Table 1). Other methods are: atomic absorption spectrometry, 39,40 NMR spectroscopy, 41 and so on.…”