Electrochemical detection in capillary electrophoresis

Area of Science:

• Analytical Chemistry
• Electrochemistry
• Separation Science

Background:

• Capillary electrophoresis (CE) is a powerful separation technique.
• Electrochemical detection (EC) offers high sensitivity and selectivity.
• Integrating CE with EC (CE-EC) presents unique challenges and opportunities.

Purpose of the Study:

• To review recent advances in CE-EC instrumentation and applications.
• To provide a state-of-the-art overview for non-electrochemists.
• To highlight suitable analytes and sample matrices for CE-EC.

Main Methods:

• Review of instrument innovations for electrical decoupling and physical alignment of CE and EC systems.
• Summary of CE-EC applications for specific analyte groups.
• Discussion of electrode material and configuration developments.

Main Results:

• Significant impact of EC techniques on CE usage in specific analytical areas.
• Detailed description of innovations addressing CE-EC interface challenges.
• Successful application of CE-EC for analyzing catecholamines, thiols, disulfides, amino acids, and carbohydrates.

Conclusions:

• CE-EC has reached a stage of significant analytical impact.
• Continued development in electrode materials and configurations will broaden its applicability.
• The technique is well-suited for specific analyte groups and sample types.