Effect of ionic strength on the behavior of amperometric enzyme electrodes mediated by redox hydrogels

The electron-transfer behavior of electroactive hydrogels formed by cross-linking ferrocene pofy(allylamine) (Fc-PAA) and glucose oxidase is investigated as a function of electrolyte ionic strength using several techniques. Cyclic voltammetry and electrochemical impedance spectroscopy show that the...

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Publicado:	1999
Materias:	ferrocene derivative glucose oxidase amperometry article enzyme electrode hydrogel ionic strength oxidation reduction reaction
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00032700_v71_n5_p1062_Battaglini http://hdl.handle.net/20.500.12110/paper_00032700_v71_n5_p1062_Battaglini
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00032700_v71_n5_p1062_Battaglini
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spelling	paper:paper_00032700_v71_n5_p1062_Battaglini2023-06-08T14:24:09Z Effect of ionic strength on the behavior of amperometric enzyme electrodes mediated by redox hydrogels ferrocene derivative glucose oxidase amperometry article enzyme electrode hydrogel ionic strength oxidation reduction reaction The electron-transfer behavior of electroactive hydrogels formed by cross-linking ferrocene pofy(allylamine) (Fc-PAA) and glucose oxidase is investigated as a function of electrolyte ionic strength using several techniques. Cyclic voltammetry and electrochemical impedance spectroscopy show that the quantity cDe 1/2 increases with electrolyte concentration. Enhancement of enzyme catalysis for the oxidation of glucose mediated by Fc-PAA is also apparent at higher KNO3 concentration. The electroactive redox center concentration, c, and the diffusion coefficient due to electron hopping in the gel, De, are independently measured by chronoamperometry at ultramicroelectrodes. Larger electrolyte ionic strength induces an increase in electroactive redox center concentration while De slightly decreases. These results are rationalized in terms of the electrostatic interactions within the redox gel backbone due to water and ion exchange with the external electrolyte, producing swelling and shrinking of the hydrogel. © 1999 American Chemical Society. 1999 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00032700_v71_n5_p1062_Battaglini http://hdl.handle.net/20.500.12110/paper_00032700_v71_n5_p1062_Battaglini
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	ferrocene derivative glucose oxidase amperometry article enzyme electrode hydrogel ionic strength oxidation reduction reaction
spellingShingle	ferrocene derivative glucose oxidase amperometry article enzyme electrode hydrogel ionic strength oxidation reduction reaction Effect of ionic strength on the behavior of amperometric enzyme electrodes mediated by redox hydrogels
topic_facet	ferrocene derivative glucose oxidase amperometry article enzyme electrode hydrogel ionic strength oxidation reduction reaction
description	The electron-transfer behavior of electroactive hydrogels formed by cross-linking ferrocene pofy(allylamine) (Fc-PAA) and glucose oxidase is investigated as a function of electrolyte ionic strength using several techniques. Cyclic voltammetry and electrochemical impedance spectroscopy show that the quantity cDe 1/2 increases with electrolyte concentration. Enhancement of enzyme catalysis for the oxidation of glucose mediated by Fc-PAA is also apparent at higher KNO3 concentration. The electroactive redox center concentration, c, and the diffusion coefficient due to electron hopping in the gel, De, are independently measured by chronoamperometry at ultramicroelectrodes. Larger electrolyte ionic strength induces an increase in electroactive redox center concentration while De slightly decreases. These results are rationalized in terms of the electrostatic interactions within the redox gel backbone due to water and ion exchange with the external electrolyte, producing swelling and shrinking of the hydrogel. © 1999 American Chemical Society.
title	Effect of ionic strength on the behavior of amperometric enzyme electrodes mediated by redox hydrogels
title_short	Effect of ionic strength on the behavior of amperometric enzyme electrodes mediated by redox hydrogels
title_full	Effect of ionic strength on the behavior of amperometric enzyme electrodes mediated by redox hydrogels
title_fullStr	Effect of ionic strength on the behavior of amperometric enzyme electrodes mediated by redox hydrogels
title_full_unstemmed	Effect of ionic strength on the behavior of amperometric enzyme electrodes mediated by redox hydrogels
title_sort	effect of ionic strength on the behavior of amperometric enzyme electrodes mediated by redox hydrogels
publishDate	1999
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00032700_v71_n5_p1062_Battaglini http://hdl.handle.net/20.500.12110/paper_00032700_v71_n5_p1062_Battaglini
_version_	1768546327364370432

Effect of ionic strength on the behavior of amperometric enzyme electrodes mediated by redox hydrogels

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