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Related Experiment Videos

Fluorescence imaging detection for capillary isoelectric focusing

X Z Wu1, J Wu, J Pawliszyn

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

Electrophoresis
|August 1, 1995
PubMed
Summary

This study introduces advanced laser-induced fluorescence (LIF) imaging detectors for capillary isoelectric focusing (CIEF). These systems achieve ultrasensitive protein detection, enabling analysis of samples at picomolar and femtomolar levels.

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Area of Science:

  • Analytical Chemistry
  • Biophysical Chemistry
  • Spectroscopy

Background:

  • Capillary Isoelectric Focusing (CIEF) is a powerful separation technique for charged molecules.
  • Sensitive detection methods are crucial for analyzing low-concentration protein samples in CIEF.
  • Laser-Induced Fluorescence (LIF) offers high sensitivity for detecting fluorescently labeled analytes.

Purpose of the Study:

  • To develop and evaluate simple and ultrasensitive LIF imaging detectors for CIEF.
  • To demonstrate the capability of these detectors for protein analysis and separation.
  • To determine the detection limits and performance of the ultrasensitive LIF system.

Main Methods:

  • Development of two LIF imaging detector systems: a simple and an ultrasensitive version.

Related Experiment Videos

  • Utilizing an argon ion laser (496.5 nm) as the excitation source.
  • Employing a charge-coupled device (CCD) camera for fluorescence detection.
  • Verification with naturally fluorescent b-phycoerythrin and FITC-labeled proteins (albumin, insulin, casein).

    • Main Results:

    • The LIF imaging detectors were successfully implemented for CIEF.
    • Protein samples achieved focusing in approximately 1.5 minutes.
    • The ultrasensitive detector achieved detection limits down to 10(-10) M and mass detection limits of ~4.5 x 10(-17) mole.
    • The system demonstrated capability for detecting 10(-11) M or amole-level protein samples.

    Conclusions:

    • The developed LIF imaging detectors are effective for CIEF analysis.
    • The ultrasensitive LIF system provides high sensitivity and low detection limits for protein analysis.
    • This method is suitable for the separation and detection of trace amounts of proteins in CIEF.