Abstract
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 (eS434 = 4386 g/(mole·cm)) and rutin complexes (eS403 = 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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