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Cyclic voltammograms of 50 µM Aβ (1–42) (dashed curve) and a mixture of 50 µM Aβ (1–42) and 50 µM Cu(II) (solid curve) in a 5 mM phosphate buffer containing 0.1 M Na2SO4 and 10% dimethylsulfoxide or DMSO (pH 7.4). The background voltammogram was collected from the same electrolyte solution without Aβ (1–42) and Cu(II) (dotted curve). A glassy carbon disk electrode with a diameter of 3 mm was used as the working electrode. The scan rate was 20 mV/s.
