Detection of charged proteins by means of impedance measurements


Kruise, J. and Rispens, J.G. and Bergveld, P. and Kremer, F.J.B. and Starmans, D. and Haak, J.R. and Feijen, J. and Reinhoudt, D.N. (1992) Detection of charged proteins by means of impedance measurements. Sensors and Actuators B: Chemical, 6 (1-3). pp. 101-105. ISSN 0925-4005

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Abstract:The electrical resistance of a membrane containing charged proteins is a function of both concentration and mobility of the electrolyte ions present in the membrane, and thus it depends on the Donnan effect. We were able to determine the resistance of such a membrane deposited on an ISFET, by means of a simple a.c. impedance measurement. As an example a membrane containing cross-linked lysozyme was used. We found the membrane resistance to be inversely proportional to the fixed charge density, in good agreement with the theoretical description based on the Donnan theory.
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Copyright:© 1992 Elsevier Science
Science and Technology (TNW)
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Metis ID: 106778