Fig. 4.
a calibration plot for ΔRct versus Log concentration of TET, b Nyquist diagram for different concentration of TET, (a-k) 1.0 × 10−16, 1.0 × 10−15, 1.0 × 10−14, 1.0 × 10−13, 1.0 × 10−12, 1.0 × 10−11, 1.0 × 10−10, 1.0 × 10−9, 1.0 × 10−8, 1.0 × 10−7, 1.0 × 10−6 M, respectively. In 5.0 mM Fe(CN)64−/3− containing 0.1 M KCl solution, The error bars represented the standard deviation (SD) (n = 3), c Selectivity of the fabricated aptasensor (n = 3) with streptomycin, penicillin G and sulfadiazine instead of TET, at the same concentrations (1 × 10–9 M). The error bars represented the SD (n = three electrodes)