Microfabricated Liquid Junction Capillary Electrophoresis-Mass Spectrometry Interface

Area of Science:

• Analytical Chemistry
• Separation Science
• Microfluidics

Background:

• Capillary electrophoresis (CE) coupled with mass spectrometry (MS) offers powerful analytical capabilities.
• Existing CE-MS interfaces can be complex to construct and operate.
• There is a need for simplified, integrated interfaces for enhanced analytical workflows.

Purpose of the Study:

• To describe the construction and operation of a novel microfabricated liquid junction CE-MS interface.
• To demonstrate the application of this interface for sensitive compound analysis.
• To present an integrated and attachable CE-MS interface solution.

Main Methods:

• Microfabrication of a liquid junction and electrospray tip using polyimide.
• Integration of the microfabricated unit into a plastic connection block.
• Attachment of the interface to a CE instrument for CE-MS analysis.
• Analysis of (2-aminoethyl)trimethylammonium (AETMA) salt-labeled dextran oligomers.

Main Results:

• Successful construction and operation of the microfabricated liquid junction CE-MS interface.
• Demonstration of rapid, efficient, and sensitive CE-MS analysis.
• Effective analysis of AETMA-labeled dextran oligomers using the developed interface.

Conclusions:

• The microfabricated liquid junction CE-MS interface provides a robust and efficient solution for analytical applications.
• This integrated interface simplifies CE-MS coupling, enhancing usability and sensitivity.
• The developed system is suitable for the analysis of complex mixtures such as labeled dextran oligomers.