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Cyclic voltammetry performance of VP1/BSA/H9E/protein-A/AuNPs/SPCE in 5.0 mM [Fe(CN)6] 3-/4- (1:1) and 0.1 M KNO3 at different scan rates (20–200 mV s−1) (A). Linear relationship between scan rate1/2 and peak current (B). The black line and red line are Ipa and Ipc, respectively. Linear regression equation: Ipa (µA) = 54.39 + 30.81v1/2 ((mV s−1)1/2; R 2 = 0.9988); Ipc (µA) = -27.84–33.72v1/2 ((mV s−1)1/2; R 2 = 0.9925).
