Quercetin and rutin upon adsorption on alumina were found to form colored chelate complexes with alumina surface groups similar to complexes with Al(III) ions in solution. The optical density of the alumina dispersion in the presence of these hydroxyflavones is greatest in neutral media and linearly dependent on their concentration in the initial solution. The conditional molar absorption coefficients of the surface quercetin (εS434 = 4386 g/(mole·cm)) and rutin complexes (εS403 = 5280 g/(mole·cm)) were determined. Highly dispersed alumina can be proposed as a solidphase reagent for the determination of quercetin and rutin in preparations of medicinal plants by a spectrophotometric or visual test method.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 86, No. 4, pp. 614–619, July–August, 2019.
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Lipkovska, N.A., Barvinchenko, V.N. Spectral Characteristics of Hydroxyflavones Adsorbed on an Alumina Surface. J Appl Spectrosc 86, 666–670 (2019). https://doi.org/10.1007/s10812-019-00876-4
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DOI: https://doi.org/10.1007/s10812-019-00876-4