Physicochemical Properties of 3-Rutinoside-5,7,3',4'-tetrahydroxyflavone in Aqueous Solutions of Ethonium Surfactant

Resumo

The effect ethonium, a dicationic surfactant, has on the physicochemical properties of a natural flavonoid, rutin, is studied spectrophotometrically in a wide range of concentrations in the region of physiological pH. It is found there are a bathochromic shift of the bands in the absorption spectra of rutin, a drop in the apparent constant of its dissociation \({\text{p}}{K}_{{{\text{a1}}}}^{{\text{a}}}\), and an increase in solubility and adsorption on the surface of nanosilica relative to aqueous solutions. The constant of bonding between rutin and ethonium is calculated.