Publication Date:
2014-11-27
Description:
Background: Construction of electrochemical impedance sensors by the self-assembly technique has become a promising strategy for the `label-free? detection of protein-ligand interactions. However, previous impedance sensors are devoid of an inherent electrochemical signal, which limits the standardization of the sensors for protein recognition in a reproducible manner. Results: We designed and synthesized an anthraquinonyl glycoside (AG) where the anthraquinone (AQ) moiety can bind to the surface of a graphene-based working electrode while the glycoside serving as a ligand for lectin. By measuring the inherent voltammetric signal of AQ, the glycosides decorated on the working electrode could be simply quantified to obtain electrodes with a unified signal window. Subsequently, impedance analysis showed that the `standardized? electrodes gave a reproducible electrochemical response to a selective lectin with no signal variation in the presence of unselective proteins. Conclusion: Anthraquinone-modified ligands could be used to facilitate the standardization of electrochemical impedance sensors for the reproducible, selective analysis of ligand-protein interactions.
Electronic ISSN:
1752-153X
Topics:
Chemistry and Pharmacology
