Capillary Electrophoresis With Amperometric Detection for Neurotransmitter Analysis: Principles, Electrode Materials,...

Area of Science:

• Analytical Chemistry
• Neuroscience
• Biochemistry

Background:

• Capillary electrophoresis (CE) with amperometric detection (AD) is crucial for analyzing electroactive neurotransmitters.
• High separation efficiency, minimal sample use, and sensitivity make CE-AD a powerful analytical tool.

Purpose of the Study:

• To provide a comprehensive review of monoamine neurotransmitter analysis using CE-AD in biological systems.
• To critically compare electrode materials, electrolyte compositions, and detection strategies.

Main Methods:

• Review of fundamental principles of amperometric detection and electrode positioning.
• Comparison of various electrode materials (carbon fiber, glassy carbon, BDD, etc.) and electrolyte systems (phosphate, MES).
• Discussion of advanced techniques like online preconcentration and redox-cycling electrodes.

Main Results:

• Phosphate buffers are common, but MES systems achieve attomole detection limits.
• Various electrode materials impact noise, sensitivity, and fouling resistance.
• CE-AD is applied to diverse biological matrices, including human tissues and single cells.

Conclusions:

• CE-AD is a versatile platform for neurochemical analysis with broad biological applications.
• Advances enhance selectivity and sensitivity, enabling attomole-level detection.
• Future trends include clinical translation and in vivo neuroanalysis, despite challenges like electrode fouling.