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. 2020 Sep 4;8:574846. doi: 10.3389/fbioe.2020.574846

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Copyright © 2020 Hassani, Rezaei Akmal, Salek Maghsoudi, Rahmani, Vakhshiteh, Norouzi, Ganjali and Abdollahi.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Nyquist spectra of EIS data for intact SPCE (A), AuNPs/SPCE (B), aptamer/AuNPs/SPCE (C), MCH/aptamer/AuNPs/SPCE (D) and BPA (100 pM)/MCH/aptamer/AuNPs/SPCE (E) in 0.1 M PBS (pH 7.4) containing [Fe(CN)₆]^3–/4–/KCl (5 mM/0.1 M) electrolyte solution. The Randles equivalent circuit was employed to model the electrochemical impedance data, (R_s: solution resistance; C_dl: double layer capacitance; R_ct: charge transfer resistance, W: Warburg impedance).