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Sensors 2011, 11(5), 5520-5528;

A Rapid Method to Regenerate Piezoelectric Microcantilever Sensors (PEMS)

Developmental Therapeutics Program, Fox Chase Cancer Center, 333 Cottman Ave., Philadelphia, PA 19111, USA
Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USA
Author to whom correspondence should be addressed.
Received: 15 March 2011 / Revised: 10 May 2011 / Accepted: 17 May 2011 / Published: 20 May 2011
(This article belongs to the Special Issue Microcantilever Sensors)
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Piezoelectric microcantilever sensors (PEMS) can be sensitive tools for the detection of proteins and cells in biological fluids. However, currently available PEMS can only be used a single time or must be completely stripped and refunctionalized prior to subsequent uses. Here we report the successful use of an alternative regeneration protocol employing high salt concentrations to remove the target, leaving the functional probe immobilized on the microcantilever surface. Our model system employed the extracellular domain (ECD) of recombinant human Epidermal Growth Factor Receptor (EGFR) as the probe and anti-human EGFR polyclonal antibodies as the target. We report that high concentrations of MgCl2 dissociated polyclonal antibodies specifically bound to EGFR ECD immobilized on the sensor surface without affecting its bioactivity. This simple regeneration protocol both minimized the time required to re-conjugate the probe and preserved the density of probe immobilized on PEMS surface, yielding identical biosensor sensitivity over a series of assays. View Full-Text
Keywords: piezoelectric microcantilever; biosensor; regeneration; antibody; antigen; biomarker piezoelectric microcantilever; biosensor; regeneration; antibody; antigen; biomarker
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Loo, L.; Wu, W.; Shih, W.Y.; Shih, W.-H.; Borghaei, H.; Pourrezaei, K.; Adams, G.P. A Rapid Method to Regenerate Piezoelectric Microcantilever Sensors (PEMS). Sensors 2011, 11, 5520-5528.

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