Autor según el artículo: Andrade, F.J.; Parrilla, M.; Cánovas, R.

Departamento: Química Analítica i Química Orgànica

Autor/es de la URV: ANDRADE , FRANCISCO JAVIER; Parrilla, M.; Cánovas, R.

Resumen: The potentiometric response to hydrogen peroxide of a platinum electrode coated with a layer of Nafion is presented. The results show that the Nafion membrane acts as an effective permselective barrier, thus significantly reducing the response to some redox active species, such as ascorbate. Even more interesting, these coated electrodes show a significantly enhanced sensitivity to hydrogen peroxide (H2O2) when the measurements are performed in solutions of high ionic strength. The influence of pH, ionic strength and supporting electrolyte on this enhancement are presented. Under optimized conditions these coated electrodes show a linear dependence with the logarithm of the concentration of H2O2, with sensitivities of -125.1±5.9 mV decade-1 (several times higher than the bare electrodes) and a linear range that spans from 10-5 M to 10-3 M of H2O2. Preliminary studies suggest that the coupling between the redox potential on the Pt electrode and the Donnan potential of the membrane play a role on this enhancement. Considering this improved sensitivity, selectivity, stability and linear ranges, this system shows promise as a future platform to build enzyme-based potentiometric biosensors.

Grupo de investigación: Grup de Quimiometria, Qualimetria i Nanosensors

Áreas temáticas: Química Química Chemistry

Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/

ISSN: 1040-0397

Identificador del autor: 0000-0003-1199-2837; 0000-0002-1344-8432; 0000-0001-9552-535X

Fecha de alta del registro: 2018-04-30

Página final: 230

Volumen de revista: 29

Versión del articulo depositado: info:eu-repo/semantics/acceptedVersion

Enlace a la fuente original: https://onlinelibrary.wiley.com/doi/abs/10.1002/elan.201600403

Programa de financiación: altres; European Union, Marie Curie Grant; FlexSens; PCIG09-GA-2011- 293538 altres; Fundación Recercaixa; SensAge; plan; CTQ2013- 46404-R altres; URV Martí i Franqués; 2013PMF-PIPF-16

DOI del artículo: 10.1002/elan.201600403

Entidad: Universitat Rovira i Virgili

Año de publicación de la revista: 2016

Página inicial: 223

Tipo de publicación: Article Artículo Article