TLC-densitometric analysis of α-escin in bulk drug substance and in pharmaceutical dosage forms
Curr Issues Pharm Med Sci., Vol. 28, No. 3, Pages 186-191
Malgorzata Dolowy, Alina Pyka-Pajak, Katarzyna Filip, Joanna Zagrodzka
1 Department of Analytical Chemistry, Faculty of Pharmacy, Medical University of Silesia in Katowice, 4 Jagiellonska, 41-200 Sosnowiec, Poland
2 R&D Analytical Chemistry Department, Pharmaceutical Research Institute, 8 Rydygiera, 01-793 Warsaw, Poland
A quite simple and rapid TLC-densitometric method for the identification of α-escin (Aescin) in bulk drug substances was developed. In so doing, different chromatographic conditions, including various mobile and stationary phases, were tested. A TLC-densitometric determination of the examined compound was performed without using visualizing reagent, yet with the use of appropriate dipping reagents, in order to obtain reliable UV-densitometric measurements of α-escin – a substance which has weak chromophore groups. Herein, the application of a mobile phase containing n-butanol-acetic acid-water in volume composition 30:7:13, the use of silica gel 60F254 plates with concentrating zone, and subsequent application of 10% sulphuric acid in ethanol or 5% vanillin in methanol/sulphuric acid, respectively, provided the best results in a TLC-densitometric study of α-escin. The described method was successfully employed to identify α-escin in commercial samples that were in an oral dosage form (tablets) and also in the form of gel containing 20 mg of α-escin.
α-escin, TLC, densitometry, triterpene compounds.