Figure 6.

(a) Selectivity of aptamer sensor. Concentrations of AFB1 and other interfering species were 300 ng/mL and 3 μg/mL, respectively. Error bars represent test results from three experiments. (b) DPV signals of three different aptamers (corresponding to CRP, PSA, and CEA) before and after incubation with 300 ng/mL AFB1 in PBS solution containing 10 μM Ru(NH₃)₆³⁺. (c) Reproducibility of the aptamer sensor. Current signals were selected from seven electrodes in different batches after incubation with 300 ng/mL of AFB1. Error bars represent the standard deviations of three measurements for each electrode. (d) Stability of the BSA/Apt/O-VMSF/ITO sensor. Seven electrodes prepared in the same batch were placed at 4 °C for different days to detect the current signal of 300 ng/mL AFB1. Error bars represent the standard deviations of the results measured in three parallel experiments.