Electrochemical Sandwich Immunoassay for the Ultrasensitive Detection of Human MUC1 Cancer Biomarker
Figure 3
Nyquist diagram for the EIS measurements in 10 mM [Fe(CN)6]3/4− in PBS (pH 7.4) at +0.13 V bias potential for the bare graphite SPE (a); after the Ab1 immobilization (b); the immunoreactions with MUC1 protein and Ab2 (c); the binding to HRP-labeled Ab3 (d).
