Interaction between cyanidin 3-glucoside and Cu (II) ions
B Smyk, B Pliszka, R Drabent - Food chemistry, 2008 - Elsevier
B Smyk, B Pliszka, R Drabent
Food chemistry, 2008•ElsevierThe interaction between cyanidin 3-glucoside (Cy 3-glc) and Cu (II) in a binary solvent
(methanol–water, 1: 1,(v/v)) and in a phosphate buffer was studied. It is demonstrated that
Cy 3-glc and Cu (II) ions form a complex that is manifested by appearance of a new
absorption band. In the complex, the reduction of Cu (II)–Cu (I) and oxidation of Cy 3-glc
takes place. The association constant of the complex formation was calculated using the
Rose–Drago method. The complex stoichiometry in the binary solvent was 1: 1, and the …
(methanol–water, 1: 1,(v/v)) and in a phosphate buffer was studied. It is demonstrated that
Cy 3-glc and Cu (II) ions form a complex that is manifested by appearance of a new
absorption band. In the complex, the reduction of Cu (II)–Cu (I) and oxidation of Cy 3-glc
takes place. The association constant of the complex formation was calculated using the
Rose–Drago method. The complex stoichiometry in the binary solvent was 1: 1, and the …
The interaction between cyanidin 3-glucoside (Cy 3-glc) and Cu(II) in a binary solvent (methanol–water, 1:1, (v/v)) and in a phosphate buffer was studied. It is demonstrated that Cy 3-glc and Cu(II) ions form a complex that is manifested by appearance of a new absorption band. In the complex, the reduction of Cu(II)–Cu(I) and oxidation of Cy 3-glc takes place. The association constant of the complex formation was calculated using the Rose–Drago method. The complex stoichiometry in the binary solvent was 1:1, and the association constant was K=(28,600±2600) M−1. Interaction of Cy 3-glc and Cu(II) ions has two stages “fast” and “slow”. The kinetics of these processes has been investigated. Thermodynamic data for the “fast” process: enthalpy (ΔH∗) and entropy (ΔE∗) of activation, were calculated.
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