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. 2020 Jul 15;8:503. doi: 10.3389/fchem.2020.00503

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Copyright © 2020 Naderi Asrami, Aberoomand Azar, Saber Tehrani and Mozaffari.

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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(A) The Nyquist plots (−Z″ vs. Z′), and (B) Cyclic voltammograms at the scan rate of 0.1 V s−1 obtained in PBS (pH 7.4) containing 5 mM glucose in the absence of [Fe(CN)6]3−/4− probe, and (C) The influence of KNO3 salt concentration, as a supporting electrolyte, on the cyclic voltammogram electrochemical response of 5 mM of glucose on GOx/Nano-ZnO/PVA/FTO biosensor. The inset in (A) shows equivalent circuit. (Zw: Warburg impedance, Ipa: anodic peak current, Rs: solution resistance, Rct: charge transfer resistance).