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Issue 6, 2005
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Biomolecule detection via target mediated nanoparticle aggregation and dielectrophoretic impedance measurement

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Abstract

A new biosensing system is described that is based on the aggregation of nanoparticles by a target biological molecule and dielectrophoretic impedance measurement of these aggregates. The aggregation process was verified within a microchannel via fluorescence microscopy, demonstrating that this process can be used in a real time sensor application. Positive dielectrophoresis is employed to capture the nanoparticle aggregates at the edge of thin film electrodes, where their presence is detected either by optical imaging via fluorescence microscopy or by measuring the change in electrical impedance between adjacent electrodes. The electrical detection mechanism demonstrates the potential for this method as a micro total analysis system (┬ÁTAS).

Graphical abstract: Biomolecule detection via target mediated nanoparticle aggregation and dielectrophoretic impedance measurement

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Publication details

The article was received on 18 Nov 2004, accepted on 31 Mar 2005 and first published on 29 Apr 2005


Article type: Paper
DOI: 10.1039/B417535B
Lab Chip, 2005,5, 606-610

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    Biomolecule detection via target mediated nanoparticle aggregation and dielectrophoretic impedance measurement

    P. J. Costanzo, E. Liang, T. E. Patten, S. D. Collins and R. L. Smith, Lab Chip, 2005, 5, 606
    DOI: 10.1039/B417535B

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