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Related Experiment Videos

Imaging electrophoretic gels with a scanning beam laser macroscope

E K Seto1, S Damaskinos, A E Dixon

  • 1Department of Physics, University of Waterloo, Ontario, Canada.

Electrophoresis
|June 1, 1995
PubMed
Summary

A new laser macroscope rapidly scans electrophoretic gels for detailed imaging. This versatile system offers high sensitivity for analyzing protein and DNA gels, improving upon traditional scanning methods.

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Area of Science:

  • Biotechnology
  • Analytical Chemistry
  • Imaging Science

Background:

  • Electrophoretic gels are crucial for separating biomolecules.
  • Current gel scanning methods can be time-consuming and limited in flexibility.
  • There is a need for rapid, high-resolution gel imaging systems.

Purpose of the Study:

  • To develop and evaluate a scanning beam laser macroscope for electrophoretic gel analysis.
  • To assess the system's performance in imaging both protein and DNA gels.
  • To determine the sensitivity and speed of the new imaging technique.

Main Methods:

  • A scanning beam laser macroscope with a telecentric, f* theta lens was developed.
  • The system uses a 10-micron laser spot for raster scanning across a 7.5 x 7.5 cm area.

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  • Images were acquired using a photomultiplier detector, creating 512 x 512 digital files.
  • Gels were imaged in transmission (protein) and fluorescence (DNA) modes.

    • Main Results:

    • The macroscope scanned gels in 5 seconds, achieving a linear scan and flat focal plane.
    • Silver-stained protein gels were successfully imaged in transmission and double-transmission.
    • DNA agarose gels stained with ethidium bromide were imaged with fluorescence sensitivity better than 25 pg.
    • The system demonstrated high resolution and rapid scanning capabilities.

    Conclusions:

    • The scanning beam laser macroscope is a viable and efficient tool for electrophoretic gel analysis.
    • Its speed and flexibility offer advantages over integrated or end-of-line scanning systems.
    • The system provides high-sensitivity imaging for various gel types and staining methods.