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Related Experiment Videos

Microfabricated porous membrane structure for sample concentration and electrophoretic analysis.

J Khandurina1, S C Jacobson, L C Waters

  • 1Chemical and Analytical Sciences Division, Oak Ridge National Laboratory, Tennessee 37831-6142, USA.

Analytical Chemistry
|May 20, 1999
PubMed
Summary

This study introduces a microfabricated injection valve with a porous membrane for electrokinetic concentration of DNA samples. This device achieves significant DNA concentration, improving subsequent electrophoretic analysis.

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Area of Science:

  • Microfluidics
  • Analytical Chemistry
  • Biotechnology

Background:

  • Electrophoretic analysis of DNA requires efficient sample preparation.
  • Traditional DNA concentration methods can be complex and time-consuming.
  • Microfluidic devices offer miniaturized solutions for biological sample handling.

Purpose of the Study:

  • To develop a microfabricated injection valve for electrokinetic concentration of DNA.
  • To enable DNA concentration under homogeneous buffer conditions.
  • To facilitate subsequent electrophoretic analysis of concentrated DNA samples.

Main Methods:

  • Fabrication of a microfluidic device with a porous silicate membrane separating two channels.
  • Utilizing electrokinetic forces across the membrane for DNA concentration.

Related Experiment Videos

  • Injecting concentrated DNA into a separation channel for analysis.
  • Comparing electrophoretic peak intensities with and without the concentration step.

    • Main Results:

    • The microfabricated valve successfully concentrated DNA samples.
    • Concentration levels increased non-linearly with time.
    • DNA fragments were concentrated up to two orders of magnitude.
    • Improved peak intensities were observed in electrophoretic analysis of concentrated samples.

    Conclusions:

    • The developed microfluidic injection valve is effective for electrokinetic DNA concentration.
    • This technology simplifies sample preparation for electrophoretic analysis.
    • The device enables significant pre-concentration of DNA, enhancing analytical sensitivity.