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

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Fig. 2 — Nyquist plots recorded using the redox probe 5 mM [Fe(CN)₆]^3-/4-/KNO₃. Frequency from 50 kHz to 0.05 Hz and amplitude 10 mV. Peptide concentration: A) 0.25, B) 0.50 and C) 0.70 mM. D) The difference in the charge transfer resistance for the different concentrations of the synthetic peptide, with 0.01 mM MCH and interaction with 1.0 μg/mL Spike protein.