Fig. 3.
A DPVs of (AuNPs/NSF)5.5/SPCE with different concentrations of miRNA-196a: 1 × 10−13 to 1 × 10−6. B The oxidation peak current is linearly correlated with logarithm of the concentration of miRNA-196a. Linear regression equation: y = 2.079x − 4.453 (R2 = 0.998). C Selectivity of electrochemical biosensors to interfering substances. Error bars represented standard deviation (n = 3). Statistical analysis: *p < 0.05. D Stability of electrochemical biosensor for detection of miRNA-196a within 7 days. Error bars represented standard deviation (n = 3)