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Capillary electrophoresis with on-chip four-electrode capacitively coupled conductivity detection for application in bioanalysis

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Guijt, RM, Baltussen, E, van der Steen, G, Frank, J, Billiet, HAH, Schalkhammer, T, Laugere, F, Vellekoop, MJ, Berthold, A, Sarro, PM and van Dedem, GWK 2001 , 'Capillary electrophoresis with on-chip four-electrode capacitively coupled conductivity detection for application in bioanalysis' , Electrophoresis, vol. 22, No. 12 , pp. 2537-2541 , doi: 10.1002/1522-2683(200107)22:12<2537::AID-ELPS2537>3.0.CO;2-C.

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Abstract

Microchip capillary electrophoresis (CE) with integrated four-electrode capacitively coupled conductivity detection is presented. Conductivity detection is a universal detection technique that is relatively independent on the detection pathlength and, especially important for chip-based analysis, is compatible with miniaturization and on-chip integration. The glass microchip structure consists of a 6 cm etched channel (20 μm × 70 μm cross section) with silicon nitride covered walls. In the channel, a 30 nm thick silicon carbide layer covers the electrodes to enable capacitive coupling with the liquid inside the channel as well as to prevent interference of the applied separation field. The detector response was found to be linear over the concentration range from 20 μM up to 2 mM. Detection limits were at the low μm level. Separation of two short peptides with a pl of respectively 5.38 and 4.87 at the 1 mM level demonstrates the applicability for biochemical analysis. At a relatively low separation field strength (50 V/cm) plate numbers in the order of 3500 were achieved. Results obtained with the microdevice compared well with those obtained in a bench scale CE instrument using UV detection under similar conditions.

Item Type: Article
Authors/Creators:Guijt, RM and Baltussen, E and van der Steen, G and Frank, J and Billiet, HAH and Schalkhammer, T and Laugere, F and Vellekoop, MJ and Berthold, A and Sarro, PM and van Dedem, GWK
Keywords: Capillary electrophoresis • On-chip conductivity detection • Peptides
Journal or Publication Title: Electrophoresis
ISSN: 0173-0835
DOI / ID Number: 10.1002/1522-2683(200107)22:12<2537::AID-ELPS2537>3.0.CO;2-C
Additional Information:

Copyright 2001 Wiley-VCH Verlag GmbH & Co.
KGaA

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