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. 2021 Feb 2;21(3):979. doi: 10.3390/s21030979

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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 (http://creativecommons.org/licenses/by/4.0/).

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(A–D) Schematic illustrations for the fabrication of electrochemical aptasensors. (A) Impedimetric assay using glassy carbon electrode (GCE) immobilized with OTA aptamer, reproduced from [190]. (B) Impedimetric assay for amoxicillin based on the synergetic effect between the amoxicillin and its aptamer on the surface of the GCE coated with TiO₂-g-C₃N₄-AuNPs, reproduced from [191]. (C) A sandwich-type aptasensor for thrombin assay using CSPH hydrogel-modified electrode, reproduced from [192]. (D) PSA assay based on polyaniline (PANI)/AuNPs as a conducting layer on GCE immobilized with a PSA aptamer, reproduced from [193].