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Sample stacking of cationic and anionic analytes in capillary electrophoresis
1Faculty of Science, Himeji Institute of Technology, Hyogo, Japan. jquirino@stanford.edu
Journal of Chromatography. A
|February 24, 2001
Summary
Sample stacking in capillary zone electrophoresis (CZE) enhances sensitivity by concentrating charged analytes. This technique, crucial for low-concentration samples, has broad applications in fields like biomedicine.
Area of Science:
- Analytical Chemistry
- Separation Science
Background:
- Capillary Zone Electrophoresis (CZE) traditionally suffers from low concentration sensitivity.
- Charged species behavior at concentration boundaries was described by Everaerts et al. in 1979.
- Sample stacking emerged as a solution to improve CZE sensitivity.
Purpose of the Study:
- To review the theory and methodological advancements of sample stacking for charged analytes in CZE and electrokinetic chromatography.
- To highlight the significance of sample stacking in overcoming sensitivity limitations.
- To discuss various on-line concentration methods.
Main Methods:
- Review of theoretical principles of sample stacking based on electrophoretic velocity changes.
- Discussion of methodological developments since the early 1990s (Chien and Burgi).
- Compilation of reported applications in biomedical and environmental fields.
Main Results:
- Sample stacking effectively concentrates charged solutes within the capillary.
- The technique significantly enhances detection sensitivity in CZE.
- Various related on-line concentration methods are briefly discussed, including sample self-stacking and sweeping techniques.
Conclusions:
- Sample stacking is a vital on-line concentration technique for charged analytes in CZE and electrokinetic chromatography.
- Its application is particularly valuable in fields requiring high sensitivity, such as biomedical and environmental analysis.
- Further development and application of stacking techniques continue to advance separation science.