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Electrochemical sensing of aptamer-protein interactions using magnetic particle assay and single-use sensor technology

Karadeniz, H. and Erdem, A. and Mayer, G. and Famulok, Michael and Caliskan, A. (2009) Electrochemical sensing of aptamer-protein interactions using magnetic particle assay and single-use sensor technology. Electroanalysis, 21 (11). pp. 1278-1284. ISSN 1040-0397

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Abstract

A magnetic particle assay has been designed herein that can report the interactions of DNA aptamers with their cognate protein targets lysozyme (LYS) and human thrombin (THR). Electrochemical sensing of the biomolecular recognition between each aptamer and its target was explored by using a disposable graphite electrode, PGE, in combination with differential pulse voltammetry (DPV). The magnitudes of the oxidation signals of LYS and THR were measured at +780 mV and +680 mV, respectively, after interaction with the cognate aptamers attached to the surface of magnetic particles. The detection limits estimated for signal to noise ratios above 3.0 correspond to the concentrations of 10.77 μg/mL LYS (769 nM) and 2.00 μg/mL THR (54.5 nM). Our aptamer based approach that combines magnetic particles with a disposable graphite electrode performs well compared to other aptamer-based sensor-formats for quantitative protein detection with respect to sensitivity, selectivity, detection limit, and reproducibility.

Item type: Article
ID code: 26089
Keywords: aptamers, proteins, aptamer – protein interactions, magnetic particles, lysozyme, thrombin, Therapeutics. Pharmacology, Analytical Chemistry, Electrochemistry
Subjects: Medicine > Therapeutics. Pharmacology
Department: Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 27 Aug 2010 15:46
    Last modified: 05 Sep 2014 05:17
    URI: http://strathprints.strath.ac.uk/id/eprint/26089

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