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Decreasing the Polymerization Potential Improves the Selectivity of PPD-Coated Disc Biosensors for Glutamate

Lookup NU author(s): Sridhar Govindarajan, Emeritus Professor Calum McNeilORCiD


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The selectivity of glutamate microdisc biosensors coated with poly(o-phenylenediamine) (PPD) as the interference-rejecting layer against ascorbic acid was observed to be very low. Enhancement in the selectivity was noticed when the electropolymerization potential for the polymerization of the o-phenylenediamine monomer was decreased from 0.65V to 0.40V vs. Ag/AgCl. The selectivity coefficient increased from -34.933.75% (n=5) to 53.054.33% (n=3). Decreasing the polymerization potential decreases the rate of formation of the polymer and improves the compactness of the polymer layer formed, thereby increasing the selectivity of the electrodes.

Publication metadata

Author(s): Govindarajan S, McNeil CJ

Publication type: Article

Publication status: Published

Journal: Analytical Letters

Year: 2009

Volume: 42

Issue: 5

Pages: 739-745

ISSN (print): 0003-2719

ISSN (electronic): 1532-236X

Publisher: Taylor & Francis Inc.


DOI: 10.1080/00032710902721972


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