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Vol. 120, Issue 9, September 2010, pp.53-61




Ellipsometric Immunosensor for Detection of Amyloid Precursor Protein with a View of Alzheimer's Disease Diagnostics


1*Alexei Nabok, 1Mohd Kamarulzaki Mustafa, 2David Parkinson, 1Anna Tsargorodskaya

1 Material and Engineering Research Institute, Sheffield Hallam University, UK

2 Biomedical Research Centre, Sheffield Hallam University, UK

Tel.: +44(0)114 2256905, fax: +44(0)114 2256930

E-mail: a.nabok@shu.ac.uk



Received: 22 June 2010   /Accepted: 14 September 2010   /Published: 27 September 2010


Abstract: The detection of amyloid precursor protein isoform 770 (APP770) was achieved with the use of total internal reflection ellipsometry (TIRE) in a direct immunoassay format with DE2 monoclonal antibodies raised against the β amyloid peptide 1-16 (Aβ 1-16) which is a part of APP770. DE2 antibodies were immobilised on the surface of gold by electrostatic binding to a layer of (poly)allylamine hydrochloride (PAH) via an intermediate layer of Protein G molecules. TIRE spectra were recorded after adsorption (binding) of every molecular layer in a sequence of PAH, Protein G, DE2, and APP770. A noticeable increase in the adsorbed layer thickness was obtained upon binding of APP770 molecules from its solution of unknown concentration in Complete Medium, a complex mixture containing other proteins. For a purpose of TIRE biosensor calibration, complementary quartz crystal microbalance (QCM) measurements were utilised and allowed the evaluation of surface concentrations of DE2 and APP770 of 1.08.1011 cm-2 and 4.73.1012 cm-2, respectively.


Keywords: Alzheimer's disease, Amyloid precursor protein, Amyloid peptide, Direct immunoassay, Total internal reflection ellipsometry, Quartz crystal microbalance


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