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. 2020 Dec 8;25(24):5787. doi: 10.3390/molecules25245787

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© 2020 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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Electrochemical aptasensors for the detection of biomolecules. (a) Aptamer anchored on gold electrode surface for Ochratoxin A (OHA) detection through structure switching of the aptamer [88]. (b) ECB for the sensitive detection of carcinoembryonic antigen (CEA) through label-free sandwich method [89]. (c) Aptamer displacement strategy-based sensor for the detection of PTK-7 [93]. (d) Schematics of a label-free competitive aptamer cytosensor design and detection process of hepatocellular carcinoma (HepG2) cells [96]. Reprinted with permission from [88], Copyright © 2020 Published by J-STAGE, [89], Copyright © 2020 Published by Elsevier B.V., [93], Copyright © 2020 Published by Springer Nature, [96], Copyright © 2020 Published by ECS. MCH: 6-mercapto-1-hexanol, PTK-7: protein tyrosine kinase-7, HP: hairpin probe.