High-speed chiral separations on microchip electrophoresis devices.

Area of Science:

• Analytical Chemistry
• Separation Science
• Microfluidics

Background:

• Chiral separations are crucial in pharmaceuticals and biochemistry.
• Traditional methods can be time-consuming and require large sample volumes.
• Micellar electrokinetic chromatography (MEKC) offers an alternative for chiral analysis.

Purpose of the Study:

• To develop a high-speed electrophoretic method for chiral separation of amino acids.
• To optimize conditions for fast and efficient enantiomer separation using CD-MEKC in a microfabricated device.

Main Methods:

• Utilized cyclodextrin-modified micellar electrokinetic chromatography (CD-MEKC).
• Employed a microfabricated device with short separation channels and high field strengths.
• Operated under counter-electroosmotic flow conditions with small volume-defined injection plugs.

Main Results:

• Achieved rapid separation of fluorescein isothiocyanate (FITC)-labeled amino acid enantiomers.
• Analysis times ranged from 75 to 160 seconds.
• Obtained high separation efficiencies, from 7000 up to 28,000 effective plates (100,000 to 395,000 plates/m).
• Identified an optimal buffer system (100 mM borate, 30 mM SDS, 10 mM gamma-CD) for resolving most enantiomers.

Conclusions:

• High-speed chiral separations of FITC-amino acid enantiomers are feasible in microfabricated devices using CD-MEKC.
• The developed method provides fast, efficient, and high-resolution enantiomeric separations.
• This approach holds promise for rapid chiral analysis in various scientific fields.