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(A) Comparison of the affinity of Cu(II) for selected ligands, given as pCu calculated on the basis of the potentiometric constants [His-Leu, this study; His-Gly,36 His-Lys,43 HVGD,76,77 GHK,23 GGH,19 histidine (His),78 and histamine (Hstm)]79 for 1 μM Cu(II) and 1–100 μM ligand at pH 7.4. (B) For the sake of clarity, the curves for His-1 peptides are shown separately for the ligand/Cu(II) molar ratio range of 10–100 μM.
