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. 2021 May 12;21(10):3360. doi: 10.3390/s21103360

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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SWVs obtained for various concentrations of UA (5 to 500 μM) (A) and FA (1 to 800 μM) (B) at Mn SnO₂/GCE in the presence of 200 μM AA in 0.1 M PBS (pH 6.0) and inreal samples (C). (insert of A–C): plots of the oxidation peak currents as a function of various concentrations of UA and FA, respectively [51].