Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1049, Issue 1-2, Pages 205-209Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2004.08.018
Keywords
SDS-PAGE; microchip; photopolymerization; protein separation; isoelectric focusing
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We have developed novel protein gel electrophoresis techniques, sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and isoelectric focusing (IEF) in short microchannels (similar tomillimeters) that take less than a minute. A photopatterning technique was used to cast in situ crosslinked polyacrylamide gel in a microchannel to perform SDS-PAGE. A fluorescent protein marker sample (M, range of 20 000-200 000) was separated in less than 30 s in less than 2 mm of channel length. Crosslinked polyacrylamide gel, patterned in channels using UV light, provides higher sieving power and sample stacking effect, therefore yielding faster and higher-resolution separation in a chip. IEF of proteins was also achieved in a microchannel, and several proteins were focussed within tens of seconds in mm-length channels. As resolution in IEF is independent of separation distance, focusing in ultra-short channels results in not only faster separation but also more concentrated bands potentially allowing detection of low-concentration species. (C) 2004 Elsevier B.V. All rights reserved.
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