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Graphene Enhanced Electron Transfer at Aptamer Modified Electrode and Its Application in Biosensing

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State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China
*Tel.: +86 431 85262101. Fax: +86 431 85689711. E-mail: [email protected]
Cite this: Anal. Chem. 2012, 84, 17, 7301–7307
Publication Date (Web):July 26, 2012
Copyright © 2012 American Chemical Society

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    Abstract Image

    Graphene (GN), a two-dimensional and one-atom thick carbon sheet, is showing exciting applications because of its unique morphology and properties. In this work, a new electrochemical biosensing platform by taking advantage of the ultrahigh electron transfer ability of GN and its unique GN/ssDNA interaction was reported. Adenosine triphosphate binding aptamer (ABA) immobilized on Au electrode could strongly adsorb GN due to the strong π–π interaction and resulted in a large decrease of the charge transfer resistance (Rct) of the electrode. However, the binding reaction between ABA and its target adenosine triphosphate (ATP) inhibited the adsorption of GN, and Rct could not be decreased. On the basis of this, we developed a new GN-based biosensing platform for the detection of small molecule ATP. The experimental results confirmed that the electrochemical aptasensor we developed possessed a good sensitivity and high selectivity for ATP. The detection range for ATP was from 15 × 10–9 to 4 × 10–3 M. The method here was label-free and sensitive and did not require sophisticated fabrication. Furthermore, we can generalize this strategy to detect Hg2+ using a thymine (T)-rich, mercury-specific oligonucleotide. Therefore, we expected that this method may offer a promising approach for designing high-performance electrochemical aptasensors for the sensitive and selective detection of a spectrum of targets.

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