A Dielectric Affinity Microbiosensor

X. Huang
S. Li, University of South Carolina - Columbia
J. S. Schultz
Qian Wang, University of South Carolina - Columbia
Q. Lin

© Applied Physics Letters 2010, American Institute of Physics

Huang, X., Li, S., Schultz, J. S., Wang, Q., & Lin, Q. (2010). A dielectric affinity microbiosensor. Applied Physics Letters, 96(3), 033701.



We present an affinity biosensing approach that exploits changes in dielectric properties of a polymer due to its specific, reversible binding with an analyte. The approach is demonstrated using a microsensor comprising a pair of thin-film capacitive electrodes sandwiching a solution of poly(acrylamide-ran-3-acrylamidophenylboronic acid), a synthetic polymer with specific affinity to glucose. Binding with glucose induces changes in the permittivity of the polymer, which can be measured capacitively for specific glucose detection, as confirmed by experimental results at physiologically relevant concentrations. The dielectric affinity biosensing approach holds the potential for practical applications such as long-term continuous glucose monitoring.