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Sensors, Volume 1, Issue 7 (December 2001), Pages 215-235

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Research

Open AccessArticle Mediated Electron Transfer at Redox Active Monolayers
Sensors 2001, 1(7), 215-228; doi:10.3390/s10700215
Received: 29 November 2001 / Accepted: 9 December 2001 / Published: 13 December 2001
Cited by 3 | PDF Full-text (178 KB)
Abstract
A theoretical model describing the transport and kinetic processes involved in heterogeneous redox catalysis of solution phase reactants at electrode surfaces coated with redox active monolayers is presented. Although the analysis presented has quite general applicability, a specific focus of the paper [...] Read more.
A theoretical model describing the transport and kinetic processes involved in heterogeneous redox catalysis of solution phase reactants at electrode surfaces coated with redox active monolayers is presented. Although the analysis presented has quite general applicability, a specific focus of the paper is concerned with the idea that redox active monolayers can be used to model an ensemble of individual molecular nanoelectrodes. Three possible rate determining steps are considered: heterogeneous electron transfer between immobilized mediator and support electrode ; bimolecular chemical reaction between redox mediator and reactant species in the solution phase, and diffusional mass transport of reactant in solution. A general expression for the steady state reaction flux is derived which is valid for any degree of reversibility of both the heterogeneous electron transfer reaction involving immobilized mediator species and of the bimolecular cross exchange reaction between immobilized mediator and solution phase reactant. The influence of reactant transport in solution is also specifically considered. Simplified analytical expressions for the net reaction flux are derived for experimentally reasonable situations and a kinetic case diagram is constructed outlining the relationships between the various approximate solutions. The theory enables simple diagnostic plots to be constructed which can be used to analyse experimental data. Full article
Open AccessArticle Determination of Active Components in Rhubarb by Cyclodextrin-modified Capillary Zone Electrophoresis
Sensors 2001, 1(7), 229-235; doi:10.3390/s10700229
Received: 21 November 2000 / Accepted: 13 December 2001 / Published: 14 December 2001
Cited by 5 | PDF Full-text (36 KB) | HTML Full-text | XML Full-text
Abstract
A cyclodextrin-modified capillary zone electrophoresis was developed for the determination of four bioactive components in Rhubarb. Effects of pH, b-CD concentration and organic modifier content on the migration and separation of the components were studied. The four components were separated in the [...] Read more.
A cyclodextrin-modified capillary zone electrophoresis was developed for the determination of four bioactive components in Rhubarb. Effects of pH, b-CD concentration and organic modifier content on the migration and separation of the components were studied. The four components were separated in the running buffer of 50 mmol/L NaOHH3BO3 (pH 10.7) containing 10 mmol/L b-CD and 12.5% v/v ethanol. The analytical performance of the method was tested with respect to linearity response, precision and recovery. The determination of two commercial Rhubarb samples under the optimized conditions showed a satisfactory result. Full article

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