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

Version 2 2024-06-04, 12:15
Version 1 2017-07-21, 14:02
journal contribution
posted on 2024-06-04, 12:15 authored by Rosanne GuijtRosanne Guijt, E Baltussen, G van der Steen, H Frank, H Billiet, T Schalkhammer, F Laugere, M Vellekoop, A Berthold, L Sarro, GW van Dedem
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 microm x 70 microm 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 microM up to 2 mM. Detection limits were at the low microM level. Separation of two short peptides with a pI 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.

History

Journal

Electrophoresis

Volume

22

Pagination

2537-2541

Location

Weinheim, Germany

ISSN

0173-0835

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

[2001, Wiley VCH]

Issue

12

Publisher

Wiley VCH