SPECTROPHOTOMETRIC DETERMINATION OF RUTIN AND ASCORBIC ACID СO-PRESENT WITH 18-MOLYBDODIPHOSPHATE HETEROPOLY COMPLEX
Journal Title: Вісник Одеського національного університету. Хімія - Year 2015, Vol 20, Issue 1
Abstract
Method for the simultaneous spectrophotometric determination of rutin and ascorbic acid (Asc) was developed based on the dependence of their reaction rate with 18-molybdodiphosphate heteropoly complex (18-MPC) on solution pH. At pH 4.5, 18-MPC selectively reacts only with Asc while at pH 7.4 both substances are quantitatively reduced with 18-MPC. It was found that linearity of the calibration graph could be significantly improved on condition that measurements are conducted not at absorption maximum of heteropoly blue (HPB) but at the wavelength corresponding to the isobestic point in the spectra of one- and two-electron HPBs. Range of linearity at the rutin determination was from 1×10-6 to 4×10-5 М and detection limit was of 6×10-7 М (l = 1 cm) while these values were for Asc from 1×10-6 to 8×10-5 М and 3×10-7 М (l = 1 сm), respectively. Method was successively applied to the determination of rutin and Asc in standard solutions and tablets of «Ascorutin».
Authors and Affiliations
T. A. Denisenko, А. B. Vishnikin, L. P. Tsiganok
Keywords
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- EP ID EP408606
- DOI 10.18524/2304-0947.2015.1(53).44552
- Views 77
- Downloads 0
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