Online sample pre-concentration via dynamic pH junction in capillary and microchip electrophoresis

Area of Science:

• Analytical Chemistry
• Biochemistry

Background:

• Capillary Electrophoresis (CE) offers high efficiency and resolution for biomolecule analysis.
• A major limitation of CE is its poor sensitivity due to short detection path lengths and small injection volumes.

Purpose of the Study:

• To review the application of dynamic pH junction as a sample preconcentration technique in CE.
• To discuss mechanisms, conditions, and published works for enhancing CE sensitivity.

Main Methods:

• Focus on dynamic pH junction, which utilizes analyte ionization changes with varying pH.
• Analysis of buffer and sample conditions for analyte preconcentration.
• Compilation of published studies on dynamic pH junction in CE (1990-2010).

Main Results:

• Dynamic pH junction effectively addresses the sensitivity limitations of CE.
• Achieved high sensitivity enhancements through analyte preconcentration.
• Demonstrated the versatility of dynamic pH junction, often in combination with other techniques.

Conclusions:

• Dynamic pH junction is a powerful strategy for improving CE sensitivity.
• Understanding pH-dependent ionization is crucial for optimizing this technique.
• The review provides a valuable resource for researchers seeking to enhance CE-based analyses.