Miniaturization in carbohydrate analysis.

Area of Science:

• Analytical Chemistry
• Separation Science
• Biotechnology

Background:

• Carbohydrate analysis via microchip electrophoresis (ME) faces challenges due to the lack of inherent electric charge and chromophores in analyte molecules.
• Despite these challenges, ME leverages established capillary electrophoresis (CE) knowledge, enabling rapid separation of simple sugars with high efficiency comparable to CE.
• The inherent limitations of carbohydrate analysis necessitate innovative approaches to improve sensitivity and applicability.

Purpose of the Study:

• To provide an overview of recent advancements in microchip electrophoresis (ME) for carbohydrate analysis.
• To highlight effective strategies for overcoming analytical challenges in carbohydrate separation and detection using ME.
• To showcase the potential of ME as a rapid and efficient tool for clinical diagnostics and glycan profiling.

Main Methods:

• Analysis at high pH utilizing the weak dissociation of hydroxyl groups to ionize carbohydrates, followed by zone electrophoresis.
• Sensitive detection of ionized carbohydrates using electrochemical methods with gold or copper electrodes.
• Application of derivatization techniques with UV-absorbing or fluorescent tags (e.g., PMP, APTS, NBD-F) for enhanced detection, albeit with potential trade-offs in speed.

Main Results:

• High pH and electrochemical detection provide a promising approach for sensitive carbohydrate ionization and separation.
• ME enables rapid analysis of simple sugars within 1 minute, demonstrating high column efficiency comparable to CE.
• Specific examples of derivatization strategies (PMP, APTS, NBD-F) are presented with detailed analytical conditions for various carbohydrate types.
• Microchip electrophoresis has been successfully applied to clinical analyses, including blood glucose assays.
• Microfluidic reactors and microarrays show promise for enzyme-assisted carbohydrate analysis and glycan profiling.

Conclusions:

• Microchip electrophoresis is a powerful technique for rapid and efficient carbohydrate analysis, particularly suitable for clinical applications.
• High pH with electrochemical detection and strategic derivatization are key methods for enhancing sensitivity and speed.
• The integration of microfluidic devices offers expanded capabilities for complex carbohydrate analysis and glycomic studies.