Figure 4 | Scientific Reports

Figure 4

From: A gold nanoparticle-protein G electrochemical affinity biosensor for the detection of SARS-CoV-2 antibodies: a surface modification approach

Figure 4

Impedance data collected from affinity biosensor chips after incubation with COVID-19 positive or negative sera followed by binding with GNP-protein G. (a–e) Impedance data collected from 5 different chips. The blue color indicates positive cases while the gray one indicates negative ones. Each curve corresponds to data collected from a single test. (f,g) two examples of failed tests, not able to distinguish between positive and negative sera. (h)The impedance data, collected from positive or negative sera, tested on the same chips, was averaged and plotted as single points. (i) The impedance data collected from individual COVID-19 positive or negative sera from different chips, was averaged.

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