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The UV–Vis absorption spectra (with indicated maximum absorption) of the extract from Aronia melanocarpa L. berries (0.05% and 0.1% AE) alone and after addition of divalent ions of zinc (Zn2+) at the concentrations of 0.01, 0.1, and 3 mM at pH 5.5. The shift of the maximum absorption after addition of Zn2+ to the AE indicates that the extract chelated these ions. A, absorbance.
