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Related Experiment Videos

Monolithic capillary electrophoresis device with integrated fluorescence detector.

J R Webster1, M A Burns, D T Burke

  • 1Center for Integrated Microsystems, Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor 48109-2122, USA.

Analytical Chemistry
|April 26, 2001
PubMed
Summary

A novel microfabricated capillary electrophoresis system with an integrated fluorescence detector achieves femtogram detection limits for DNA fragments. This silicon-based device enhances sensitivity by minimizing light interference for precise molecular analysis.

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Area of Science:

  • Microfabrication and Analytical Chemistry
  • Development of integrated microfluidic devices for molecular analysis

Background:

  • Capillary electrophoresis (CE) is a powerful separation technique.
  • Integrated detectors can improve the efficiency and sensitivity of CE systems.
  • Previous integrated detectors faced challenges with excitation light and electric field interference.

Purpose of the Study:

  • To develop a monolithic capillary electrophoresis system with an integrated on-chip fluorescence detector.
  • To overcome limitations of existing integrated detection systems.
  • To achieve high sensitivity for molecular separations.

Main Methods:

  • Microfabrication of a monolithic capillary electrophoresis system on a silicon substrate.
  • Integration of photodiodes for fluorescence detection.

Related Experiment Videos

  • Incorporation of a thin-film interference filter to block excitation light.
  • Utilizing a transparent AZO conducting ground plane to shield photodiodes from electric fields.

    • Main Results:

    • Successful microfabrication of a monolithic CE system with integrated fluorescence detection.
    • Demonstrated femtogram detection limits for DNA restriction fragments.
    • SYBR Green I intercalating dye used for enhanced fluorescence detection.

    Conclusions:

    • The developed monolithic CE system with integrated fluorescence detection is highly sensitive.
    • The design effectively mitigates interference from excitation light and electric fields.
    • This technology offers a promising platform for sensitive molecular analysis.