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. 2022 Jan 10;10:100105. doi: 10.1016/j.biosx.2022.100105

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© 2022 Published by Elsevier B.V.

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Fig. 2 — Oxidation response of the AuNPs-LSG sensor with magnified DPV peaks corresponding (a, c) SARS-CoV-2 S1 and (b, d) S2 protein various concentrations with respect to LSG RE. The insets indicate the logarithmic relation of the oxidation current difference (ΔIox) and S1 and S2 protein concentration (logCS1 and logCS2). Histograms showing (e) the response of the AuNPs-LSG sensor towards different viruses including Influenza B (INFB) (5.59 %RSD), Human Rhinovirus (HRV) (10.5 %RSD), Respiratory Syncytial Virus (RSV) (4.93 %RSD), Influenza A (H1N1) (INFA-H1N1) (0.85 %RSD), Human Coronavirus 229E/NL63 (HCoV-229E/NL63) (1.02 %RSD), Adenovirus/Rhinovirus, (HAdV/HRV) (1.97 %RSD), SARS-CoV-2 B.1.1.7 (2.59 %RSD), B.1.351 variants (0.46 %RSD), SARS-CoV-2 without mutation (0.58 %RSD) and control (negative) sample (18.7 %RSD),; (f) the change in oxidation current for nasopharyngeal swab dilution percentages 25% (0.65 %RSD), 50% (1.03 %RSD), 75% (0.47 %RSD), 100% (4.76 %RSD). (Error bars: ± SD for n = 3 for different sensors). 5.0 mM [Fe (CN)6]3–/4– containing 0.1 M PBS and 0.1 M KCl was used as redox buffer at 50 mV/s scan rate.