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. 2021 Dec 13;239:123147. doi: 10.1016/j.talanta.2021.123147

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Fig. 2 — The Concentration-dependent effect of Spike S1 binding on charge transfer resistance. A) Representative Nyquist plots from measurements of a bare gold electrode (denoted ‘Bare GE’, black squares), S1Ab-functionalized electrode (‘Bare GE + S1Ab’, red circles), and S1Ab-functionalized electrode after incubation in a solution containing 100 μg/mL purified S1 (‘Bare GE + S1Ab + S1 protein’, green triangles); B) the corresponding R_ct values averaged over 3–5 repetitions. C) Relative R_ct change obtained for different S1-RBD concentrations (0.015, 1.55, 15.5, 155 and 1550 μg/mL). ΔR_ct values were calculated by: [R_ct(RBD)/R_ct(S1Ab)]-1 and averaged over 3 to 5 repetitions; D) Dependence of %ΔR_ct on RBD concentration. Error bars represent ±SD. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)