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III. Deviceless Decoupled Electrochemical Detection of Catecholamines in Capillary Electrophoresis using Gold Microband Array Electrodes
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
2002 In: Electrophoresis, Vol. 23, 3678-3682 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2002. Vol. 23, 3678-3682 p.
URN: urn:nbn:se:uu:diva-90121OAI: oai:DiVA.org:uu-90121DiVA: diva2:162338
Available from: 2003-03-07 Created: 2003-03-07Bibliographically approved
In thesis
1. Electrochemical Aspects of Miniaturized Analytical Platforms
Open this publication in new window or tab >>Electrochemical Aspects of Miniaturized Analytical Platforms
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis ties some electrochemical aspects of development and fabrication of an analytical system on a microchip together. These aspects develop through the fundamentals of amperometric detection in microsystems and microfabrication via the interaction of electrochemical detection and electrophoretic separation finally to the interfacing of a microsystem to the macro world.

Paper I deals with amperometric detection in microscale systems and describes the fabrication of the necessary on-chip microelectrodes together with fluidic channels in silicon. It was furthermore studied, if the interelectrode distance of some μm could be used to improve the sensitivity in amperometric detection by employing redox cycling.

Papers II, III and IV deal with the effect of a high voltage field on amperometric detection. In analytical microdevices typically an electrophoretic separation step (e.g. capillary electrophoresis, CE) precedes the detection. The interference of the CE high voltage with the amperometric detection potential is often considered one of the main hindrances for an effective combination of these techniques. In paper II one reason for the observed disturbing potential shift was elucidated. It was shown that positioning of working electrode and reference electrode on an equipotiental surface eliminates this problem. Paper III reports an application of this technique. In paper IV it could be shown that this approach could further be used to significantly reduce the instrumental requirements for amperometric detection in CE.

Papers V, VI, VII, finally discuss the interfacing of low volumetric flows that typically occur on microanalytical devices to other techniques. Both, interfacing from liquid to liquid phase (μLC to CE in paper V) and from liquid to gas phase (CE to MS in paper VI and VII) were discussed. Electrochemical methods are used in this context to evaluate the stability and, in paper VI and VII, to increase the understanding of underlying processes of corrosion.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2003. 42 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 810
Analytical chemistry, electrochemical detection, microanalytical systems, on-chip CE, ESI, Analytisk kemi
National Category
Analytical Chemistry
Research subject
Analytical Chemistry
urn:nbn:se:uu:diva-3297 (URN)91-554-5536-0 (ISBN)
Public defence
2003-03-28, BMC:B41, Uppsala, 10:15
Available from: 2003-03-07 Created: 2003-03-07 Last updated: 2011-12-09Bibliographically approved

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