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The UV–Vis absorption spectra (with indicated maximum absorption) of cyanidin 3-O-β-galactoside (0.008% C3G), quercetin (0.002% Q), kaempferol (0.002% K), and ethylenediaminetetraacetic acid (0.002% EDTA) alone and after addition of divalent ions of copper (Cu2+) at the concentrations of 0.01, 0.05, and 5 mM at pH 5.5. The shift of the maximum absorption after addition of Cu2+ to the solution of the investigated compound indicates that this compound chelated these ions. A, absorbance.
