Fig. 3. (a) Cyclic voltammograms of GCE, GCE/Au and GCE/Au/AuBP@Pt electrode in aqueous 0.5 M H2SO4 solution. (b) The characterization of surface-modification on GCE/Au/AuBP@Pt electrode: cyclic voltammograms of the GCE/Au/AuBP@Pt electrode (curve a) modified with Ab1 (curve b), Ab1 + BSA (curve c), Ab1 + BSA + APOE4 (curve d) Ab1 + BSA + APOE4 + Ab2 label (curve e). The cyclic voltammograms are carried out in 5 mM [Fe(CN)6]3−/[Fe(CN)6]4− at scan rates of 50 mV·s−1.
