Show simple item record

dc.contributor.authorGalceran i Nogués, Josep
dc.contributor.authorTaylor, S. L.
dc.contributor.authorBartlett, P. N.
dc.date.accessioned2015-11-03T09:22:03Z
dc.date.available2015-11-03T09:22:03Z
dc.date.issued2001
dc.identifier.issn1572-6657
dc.identifier.urihttp://hdl.handle.net/10459.1/48899
dc.description.abstractThe steady-state currents at an inlaid microdisc electrode have been modelled for a redox mediated enzyme catalysed reaction (such as the glucose/glucose oxidase/ferrocene system) in which all the components are present in homogeneous solution and the reaction of the redox mediator at the electrode is assumed to be either reversible or mass transport limited. The numerical solution for the non-linear system in the axisymmetrical geometry of the inlaid disc is achieved by using the finite element method in an iterative scheme. The resulting concentration and reaction profiles provide useful insight into the process, and show for some parameter values the formation of an almost spherical, sharp reaction layer or shell, whose position can be predicted approximately. Conditions under which the scheme reverts to the pseudo-first-order EC′ mechanism and expressions to interpret the corresponding current are discussed. A simple approximate expression is worked out under the assumption of constant substrate concentration on the electrode surface. This approximate expression is useful in determining a combination of the parameters from the slope of measurements at low substrate concentration. The effect of some parameters is discussed in detail, leading to two suggestions which can improve the analytical performance: (i) use of the lowest mediator concentration compatible with the background current and (ii) use of the largest microelectrode which reaches steady state in a reasonable time. Experimental measurements using ferrocene monocarboxylic acid as the mediator for the glucose/glucose oxidase system agree with the model and confirm the order of magnitude of the previously reported parameter values.
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherElsevier
dc.relation.isformatofVersió postprint del document publicat a: https://doi.org/10.1016/S0022-0728(01)00503-4
dc.relation.ispartofJournal of Electroanalytical Chemistry, 2001, vol. 506, num. 2, p. 65-81
dc.rights(c) Elsevier, 2001
dc.subject.classificationElectroquímica
dc.subject.classificationAnàlisi electroquímica
dc.subject.otherElectrochemistry
dc.subject.otherElectrochemical analysis
dc.titleModelling the steady-state current at the inlaid disc microelectrode for homogeneous mediated enzyme catalysed reactions
dc.typeinfo:eu-repo/semantics/article
dc.date.updated2015-11-03T09:22:04Z
dc.identifier.idgrec002966
dc.type.versioninfo:eu-repo/semantics/acceptedVersion
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.identifier.doihttps://doi.org/10.1016/S0022-0728(01)00503-4


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record