Detection of -Amyloid (1-42) on Protein Array Based on Electrical Detection Technique Using Scanning Tunneling Microscopy
In this study an immuno-array for A 42 based on scanning tunneling microscopy (STM) was developed using conjugated gold nanoparticle (Au-NP) and antibody (Ab) complex. Fragmented monoclonal Ab against A42 was allowed to immobilize on the Au-dot arrays followed by its target protein A42 and Au NP and Ab complex. The surface structure of Au-NP and Ab complex on Au-dots was investigated with Atomic Force Microscopy and the current profile of fabricated immunosensing element was investigated with STM. The power spectrum derived from the current profile was found to be increasing with higher concentrations of A42 having a detection limit of 100 fg/ml. The proposed technique can be a promising method to construct the highly sensitive and efficient protein chip of immunosensors arrays.
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Document Type: Research Article
Publication date: 2011-05-01
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