Modifications of Poly(o-phenylenediamine) Permselective Layer on Pt-Ir for Biosensor Application in Neurochemical Monitoring
Kirwan, Sarah M. and Rocchitta, Gaia and McMahon, Colm P. and Craig, Jennifer D. and Killoran, Sarah J. and O'Brien, Kylie B. and Serra, Pier A. and Lowry, John P. and O'Neill, Robert D. (2007) Modifications of Poly(o-phenylenediamine) Permselective Layer on Pt-Ir for Biosensor Application in Neurochemical Monitoring. Sensors, 7 (4). pp. 420-437. ISSN 1424-8220
Reports that globular proteins could enhance the interference blocking ability of the PPD (poly(o-phenylenediamine) layer used as a permselective barrier in biosensor design, prompted this study where a variety of modifying agents were incorporated into PPD during its electrosynthesis on Pt-Ir electrodes. Trapped molecules, including fibrous proteins and ß-cyclodextrin, altered the polymer/modifier composite selectivity by affecting the sensitivity to both H2O2 (signal molecule in many enzyme-based biosensors) and the archetypal interference species, ascorbic acid. A comparison of electrochemical properties of Pt and a Pt-Ir alloy suggests that the benefits of the latter, more rigid, metal can be exploited in PPD-based biosensor design without significant loss of backward compatibility with studies involving pure Pt.
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