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. 2022 Mar 21;1205:339739. doi: 10.1016/j.aca.2022.339739

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Fig. 3 — A) and C) Nyquist plots obtained in 5 mM [Fe(CN)₆]^3-/4-/KNO₃ as redox probe, with 50 kHz to 0.05 Hz frequency range and 10 mV amplitude at 0.05, 0.1, 0.25, 0.5, 0.8, 1.0, 2.0 and 3.0 μg/mL Spike protein and 10¹, 10², 1.8 × 10², 3.0 × 10², 5.6 × 10², 10³ copies/mL and Inset: 10⁴, 10⁵, 10⁶ copies/mL lysate SARS-CoV-2 viral particles, respectively; B) and D) The resultant calibration curves and inset is the linear regression between the concentration of Spike protein and lysate SARS-CoV-2 viral particles, respectively. Bars are mean values from 3 independent biosensors.