A Simple Ratiometric Electrochemical Aptasensor Based on Exonuclease III-Assisted Target Recycling for Ultrasensitive Detection of Prostate Specific Antigen

Figure 5

(a) SWV responses of the aptasensor to PSA standards with different concentrations ((a–g) 0, 100 fg·mL⁻¹, 1 pg·mL⁻¹, 10 pg·mL⁻¹, 100 pg·mL⁻¹, 1 ng·mL⁻¹, and 10 ng·mL⁻¹). (b) Relationship between the MB and Fc peak currents and the logarithm concentration of PSA. (c) The relation between I_MB/I_Fc and PSA concentrations (inset is the calibration plots between I_MB/I_Fc and the logarithm of PSA concentrations).

(a)

(b)

(c)