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Micellar electrokinetic chromatography in zero-electroosmotic flow environment
G M Janini1, G M Muschik, H J Issaq
1SAIC Frederick, NCI-Frederick Cancer Research and Development Center, MD 21702, USA.
Journal of Chromatography. B, Biomedical Applications
|August 9, 1996
Summary
Reversed-flow micellar electrokinetic chromatography (RF-MEKC) offers efficient separation of hydrophobic compounds. This method enhances detection sensitivity and allows separations in acidic or basic media, unlike traditional MEKC.
Area of Science:
- Analytical Chemistry
- Separation Science
- Chromatography
Background:
- Micellar electrokinetic chromatography (MEKC) is a powerful separation technique.
- Traditional MEKC often faces limitations with hydrophobic solutes and specific buffer conditions.
Purpose of the Study:
- To introduce and describe Reversed-Flow MEKC (RF-MEKC) for enhanced separation of neutral solutes.
- To present equations for migration and resolution in RF-MEKC.
- To demonstrate the advantages of RF-MEKC for hydrophobic compound analysis.
Main Methods:
- Utilizing polyacrylamide-coated capillaries with suppressed electroosmotic flow.
- Employing sodium dodecyl sulfate (SDS) as the surfactant.
- Analyzing polycyclic aromatic hydrocarbons, aflatoxins, and dansylated-amino acids.
Main Results:
- RF-MEKC reverses solute migration order compared to N-MEKC.
- Migration time is inversely proportional to micelle concentration, enabling rapid separations.
- High-efficiency separation of hydrophobic compounds with enhanced detection sensitivity was achieved.
- Separations were demonstrated in both basic and acidic media (pH 4.2).
Conclusions:
- RF-MEKC provides a versatile and efficient method for separating hydrophobic and other neutral solutes.
- The technique offers improved sensitivity due to sharp peaks and minimal background noise.
- RF-MEKC expands the applicability of MEKC to various buffer conditions, including acidic media.