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On-column sample gating for high-speed capillary zone electrophoresis.
1Department of Chemistry, University of North Carolina, Chapel Hill 27599-3290.
Analytical Chemistry
|April 15, 1991
Summary
This study introduces high-speed zone electrophoresis for rapid amino acid separation using high electric fields and short capillaries. Laser-induced photolysis enables fast, automated sample introduction, achieving separations in under 2 seconds.
Area of Science:
- Analytical Chemistry
- Separation Science
- Biochemistry
Background:
- Capillary electrophoresis (CE) is a powerful separation technique.
- Achieving rapid separations in CE remains a challenge.
- Automated sample introduction is crucial for high-throughput analysis.
Purpose of the Study:
- To develop a high-speed zone electrophoresis method for rapid separation of amino acids.
- To investigate the use of laser-induced photolysis for controlled sample introduction.
- To identify factors limiting separation speed and efficiency.
Main Methods:
- High-speed zone electrophoresis in a fused-silica capillary.
- Utilized elevated electric fields and short capillary lengths.
- Employed laser-induced photolysis of a tagging reagent for analyte zone formation.
- Separated fluorescein isothiocyanate (FITC) labeled amino acids.
Main Results:
- Achieved separation of FITC-labeled amino acids in as little as 1.5 seconds.
- Demonstrated rapid and automated sample introduction via laser-induced photolysis.
- Identified Joule heating as the primary limitation to speed and efficiency.
Conclusions:
- High-speed zone electrophoresis offers a viable method for rapid amino acid analysis.
- Laser-induced photolysis is an effective gating strategy for automated sample introduction.
- Further optimization is needed to overcome Joule heating limitations for enhanced speed and efficiency.