1. Real-time monitoring of macromolecular biosensing probe self-assembly and on-chip ELISA using impedimetric microsensors.
- Author
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Zang F, Gerasopoulos K, Fan XZ, Brown AD, Culver JN, and Ghodssi R
- Subjects
- Electric Impedance, Equipment Design, Nanotubes ultrastructure, Biosensing Techniques instrumentation, Capsid Proteins chemistry, Dielectric Spectroscopy instrumentation, Enzyme-Linked Immunosorbent Assay instrumentation, Immunoglobulin G analysis, Nanotubes chemistry, Tobacco Mosaic Virus chemistry
- Abstract
This paper presents a comprehensive study of the self-assembly dynamics and the biosensing efficacy of Tobacco mosaic virus-like particle (TMV VLP) sensing probes using an impedimetric microsensor platform. TMV VLPs are high surface area macromolecules with nanorod structures constructed from helical arrangements of thousands of identical coat proteins. Genetically modified TMV VLPs express both surface attachment-promoting cysteine residues and FLAG-tag antibody binding peptides on their coat protein outer surfaces, making them selective biosensing probes with self-assembly capability on sensors. The VLP self-assembly dynamics were studied by the continuous monitoring of impedance changes at 100Hz using interdigitated impedimetric microsensors. Electrical impedance spectroscopy revealed VLP saturation on impedance sensor surface with the coverage of 68% in self-assembly process. The VLP-functionalized impedance sensors responded to 12ng/ml to 1.2μg/ml of target anti-FLAG IgG antibodies in the subsequent enzyme-linked immunosorbent assays (ELISA), and yielded 18-35% total impedance increases, respectively. The detection limit of the target antibody is 9.1ng/ml using the VLP-based impedimetric microsensor. These results highlight the significant potential of genetically modified VLPs as selective nanostructured probes for autonomous sensor functionalization and enhanced biosensing., (Copyright © 2016 Elsevier B.V. All rights reserved.)
- Published
- 2016
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