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Related Experiment Videos

Liquid core waveguide for full imaging of electrophoretic separations.

José A Olivares1, Peter C Stark, Paul Jackson

  • 1Los Alamos National Laboratory, Bioscience Division, New Mexico 87545, USA.

Analytical Chemistry
|May 30, 2002
PubMed
Summary

A novel liquid core waveguide system enables sensitive imaging of DNA and protein separations. This technology achieves zeptomolar detection limits for analyzing biological molecules with high resolution.

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Molecular Biology

Background:

  • Accurate analysis of DNA and proteins is crucial for biological research.
  • Existing separation and detection methods can be limited in sensitivity and resolution.

Purpose of the Study:

  • To develop and demonstrate a novel liquid core waveguide system for high-sensitivity imaging of molecular separations.
  • To validate the system's utility for DNA fragment sizing and protein isoelectric focusing.

Main Methods:

  • Utilized a liquid core waveguide for excitation and light collection via total internal reflectance.
  • Employed a scanning laser to excite separated analyte bands in an electrophoresis capillary.
  • Collected fluorescence end-on using an optical fiber coupled to a photomultiplier tube.

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Main Results:

  • Achieved detection of target molecules in the zeptomolar range.
  • Demonstrated successful imaging of DNA electrophoresis separations and protein isoelectric focusing.
  • The system provided an image of the separation along the capillary length.

Conclusions:

  • The liquid core waveguide system offers a highly sensitive and efficient platform for imaging molecular separations.
  • This technology has significant potential for advancing analytical techniques in biochemistry and molecular biology.