Zhu BW, Cai L, He XP, Chen GR, Long YT. Anthraquinonyl glycoside facilitates the standardization of graphene electrodes for the impedance detection of lectins.
Chem Cent J 2014;
8:67. [PMID:
25435901 PMCID:
PMC4245500 DOI:
10.1186/s13065-014-0067-y]
[Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Accepted: 10/30/2014] [Indexed: 12/02/2022] Open
Abstract
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 supplementary material
The online version of this article (doi:10.1186/s13065-014-0067-y) contains supplementary material, which is available to authorized users.
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