Electrokinetic separation of chiral compounds.

Area of Science:

• Analytical Chemistry
• Biochemistry
• Separation Science

Background:

• Chiral separation of amino acids is crucial for pharmaceutical and biological analysis.
• Existing methods can be time-consuming or require large sample volumes.
• High-voltage zone electrophoresis offers potential for rapid and sensitive separations.

Purpose of the Study:

• To develop a rapid and sensitive method for resolving racemic amino acid mixtures.
• To utilize high-voltage zone electrophoresis with laser-fluorescence detection for chiral analysis.
• To investigate the effectiveness of a chiral support electrolyte for amino acid separation.

Main Methods:

• High-voltage zone electrophoresis in capillary columns.
• Use of a chiral support electrolyte containing a copper(II) complex of L-histidine.
• Laser-fluorescence detection for sensitive quantitation.
• Analysis of dansyl-derivatized amino acids.

Main Results:

• Successful resolution of femtomole amounts of racemic amino acid mixtures.
• Rapid analysis time of approximately 10 minutes.
• Separation achieved through diastereomeric interactions within the chiral electrolyte.
• Detection of all charged species (positive, neutral, negative) in a small detection volume.

Conclusions:

• High-voltage zone electrophoresis with laser-fluorescence detection provides a fast and sensitive method for chiral amino acid resolution.
• The developed method is effective for analyzing trace amounts of derivatized amino acids.
• Diastereomeric interactions in a chiral support electrolyte are key to successful separation.