Progress in stacking techniques based on field amplification of capillary electrophoresis

Area of Science:

• Analytical Chemistry
• Separation Science

Background:

• Capillary electrophoresis (CE) suffers from low detection sensitivity, limiting its analytical applications.
• In-line stacking is a key strategy to overcome CE sensitivity limitations.

Purpose of the Study:

• To review field amplification stacking techniques for enhancing CE sensitivity.
• To provide examples of methods for improving detection limits in CE.

Main Methods:

• Field-amplified sample stacking (FASS)
• Large-volume sample stacking (LVSS)
• Field-amplified stacking injection (FASI) and its variations (head-column, matrix)
• Coupling FASI with extraction and clean-up
• Electrokinetic supercharging
• Cation-anion selective exhaustive injection-sweeping-micellar electrokinetic chromatography (CASEMEC)
• Novel techniques combining field amplification with other methods

Main Results:

• Field amplification stacking offers effective and simple solutions for high-sensitivity CE.
• Various techniques demonstrate significant improvements in detection sensitivity.
• Examples illustrate practical applications for overcoming sensitivity challenges.

Conclusions:

• Field amplification stacking is a powerful approach to enhance CE sensitivity.
• The reviewed techniques offer diverse strategies with varying advantages and limitations.
• Future developments promise further advancements in sensitive CE analysis.