Fig. 6

The differential pulse voltammograms and calibration plots for the AQMS electrochemical reduction after hybridization with different concentration of DNA target (a: 10⁻⁸, b: 10⁻⁷, c: 10⁻⁶, d: 10⁻⁵, e: 10⁻⁴, f: 10⁻³ and g: 10⁻² nM) in 0.05 M PBS pH 7. The DPV method was applied under the following conditions: initial potential − 0.7 V, end potential − 0.2 V, modulation amplitude 50 mV and scan rate 50 mVs⁻¹