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Related Experiment Videos

Two-dimensional electrochromatography/capillary electrophoresis on a microchip.

N Gottschlich1, S C Jacobson, C T Culbertson

  • 1Oak Ridge National Laboratory, Tennessee 37831-6142, USA.

Analytical Chemistry
|June 14, 2001
PubMed
Summary

A novel two-dimensional separation system combined open-channel electrochromatography and capillary electrophoresis on a microchip. This innovative method efficiently analyzed complex biological samples in minutes.

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Area of Science:

  • Analytical Chemistry
  • Separation Science
  • Microfluidics

Background:

  • Two-dimensional (2D) separation techniques enhance resolution for complex samples.
  • Microfluidic devices offer miniaturization and efficiency in analytical separations.

Purpose of the Study:

  • To develop and demonstrate a novel 2D microfluidic separation system.
  • To integrate open-channel electrochromatography (OCEC) with capillary electrophoresis (CE) for enhanced analysis.

Main Methods:

  • A microfabricated device employed OCEC in a spiral channel (25 cm) as the first dimension.
  • CE in a straight channel (1.2 cm) served as the second dimension, receiving repetitive injections.
  • Octadecylsilane (ODS) chemical modification was used for the OCEC channel.

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Main Results:

  • The 2D system successfully separated fluorescently labeled tryptic digests of beta-casein.
  • Analysis was completed within a rapid 13-minute timeframe.
  • The system demonstrated effective coupling of OCEC and CE for complex mixture analysis.

Conclusions:

  • The demonstrated 2D OCEC-CE microfluidic system provides a powerful platform for rapid and high-resolution separation.
  • This approach is suitable for analyzing complex biological digests, such as protein tryptic digests.
  • Miniaturized 2D separations offer significant advantages in speed and efficiency for biochemical analysis.