Fig. 6.

LSPR response in detecting antibodies against the SARS-CoV-2 spike protein in a diluted human plasma. (a) Typical sensorgrams corresponding to the detection of 1ng/mL of anti-SARS-CoV-2 spike protein antibodies in diluted human plasma (black line) and sensor response against diluted human plasma without the target antibody (red line). The vertical dashed lines highlight each step of the protocol described in the text. (b) LSPR response at different anti-SARS-CoV-2 spike protein antibody concentrations in PBS (red bars) and diluted plasma (blue bars). Each data point corresponds to the average value measured in 3 experiments, with the error bars denoting the standard deviation.