Detection of the tau protein in human serum by a sensitive four-electrode electrochemical biosensor

Wang, Scarlet Xiaoyan, Acha, Desiree, Shah, Ajit J. ORCID:, Hills, Frank ORCID:, Roitt, Ivan, Demosthenous, Andreas and Bayford, Richard (2017) Detection of the tau protein in human serum by a sensitive four-electrode electrochemical biosensor. Biosensors and Bioelectronics, 92 . pp. 482-488. ISSN 0956-5663 (doi:10.1016/j.bios.2016.10.077)

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This study presents a novel approach based on a four-electrode electrochemical biosensor for the detection of tau protein – one of the possible markers for the prediction of Alzheimer's disease (AD). The biosensor is based on the formation of stable antibody–antigen complexes on gold microband electrodes covered with a layer of a self-assembled monolayer and protein G. Antibodies were immobilized on the gold electrode surface in an optimal orientation by protein G interaction. Electrochemical impedance spectroscopy was used to analyze impedance change, which revealed a linear response with increasing tau concentrations. The assay is fast (<1 h for incubation and measurement) and very sensitive. The limit of quantification for the full-length 2N4R tau protein is 0.03 pM, a value unaltered when the assay was processed in bovine serum albumin or human serum. This technology could be adapted for the detection of other biomarkers to provide a multiple assay to identify AD progression in a point of care setting.

Item Type: Article
Research Areas: A. > School of Science and Technology > Natural Sciences > Biophysics and Bioengineering group
Item ID: 20921
Notes on copyright: © 2016. This author's accepted manuscript version is made available under the CC-BY-NC-ND 4.0 license
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Depositing User: Richard Bayford
Date Deposited: 08 Nov 2016 11:12
Last Modified: 22 May 2020 18:20

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