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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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Analysis of the sensitivity of an impediometric biosensor for the detection of bacteria

Webster, M.S. and Timoshkin, I. and MacGregor, S.J. and Fouracre, R.A. and Mattey, M. (2009) Analysis of the sensitivity of an impediometric biosensor for the detection of bacteria. In: IEEE Conference on Electrical Insulation and Dielectric Phenomena, 2009, 2009-10-18 - 2009-10-21.

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Abstract

An electrostatic finite element model of an interdigitated microelectrode array impedance biosensor has been used to further investigate the biosensor's sensitivity to detecting bacteria. Specifically, the sensor's sensitivity towards bacteria of different sizes was investigated and it was found that the biosensor was more sensitive to certain bacteria depending on their diameter. Further, it was discovered that by altering the sensor's physical wavelength, the sensor's topology can be optimized for the detection of a specific bacteria based on bacteria diameter. The effect of bacteria aggregation was also investigated. Increased aggregation i.e. increased numbers of bacteria on the sensor surface, eventually leads to sensor saturation and a maximum change in normalized capacitance can be estimated for a specific sensor topology. It is hoped that the modelling work presented here will aid in improved and knowledgeable development of the actual sensor for the rapid detection of bacteria.