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Continuous electrophoretic separations in narrow channels coupled to small-bore capillaries
J M Mesaros1, G Luo, J Roeraade
1Department of Chemistry, Pennsylvania State University, University Park 16802.
Analytical Chemistry
|November 15, 1993
Summary
This study demonstrates continuous zone electrophoresis for sampling and separating analytes from microenvironments. The technique utilizes capillary sampling coupled to a channel for continuous electrophoretic separation and laser-induced fluorescence detection.
Area of Science:
- Analytical Chemistry
- Separation Science
- Microfluidics
Background:
- Continuous sampling and separation from microenvironments are challenging.
- Electrophoretic techniques offer high-resolution separations.
- Microfluidic devices enable miniaturized analytical systems.
Purpose of the Study:
- To demonstrate continuous zone electrophoretic separations in channels.
- To develop a technique for continuous sampling and separation of analytes from volume-limited microenvironments.
Main Methods:
- A small-bore capillary was used for electrophoretic sampling.
- The capillary was coupled to a quartz channel for continuous injection.
- Laser-induced fluorescence detection with fiber optic arrays was employed.
Main Results:
- Continuous separation of dansylated amino acids was achieved within minutes.
- Continuous sampling was performed for up to 400 seconds.
- Initial detection limits were approximately 30 microM.
Conclusions:
- Continuous zone electrophoresis in channels is a viable technique for microenvironmental analysis.
- The method allows for continuous sampling and separation of analytes.
- Further optimization may improve detection limits for broader applications.