Multidimensional capillary electrophoresis

Area of Science:

• Analytical Chemistry
• Separation Science
• Capillary Electrophoresis

Background:

• Multidimensional separation in capillary electrophoresis (CE) enhances analytical performance by combining orthogonal displacement mechanisms.
• Peak capacity is maximized by multiplying the individual peak capacities of coupled separation techniques.
• Early research focused on capillary connections for 2D CE, with current systems adept at analyzing complex biological and environmental samples.

Purpose of the Study:

• To review the advancements in multidimensional CE over the past 15 years.
• To highlight the development of interfaces and interface-free techniques in multidimensional CE.
• To discuss improvements in sample concentration and detection sensitivity for complex mixture analysis.

Main Methods:

• Review of literature on multidimensional CE developments from the last 15 years.
• Focus on interface engineering for 2D and 3D CE systems.
• Exploration of integrated separations, microdevices, and on-line sample pre-concentration techniques.

Main Results:

• Significant improvements in peak capacity and resolution for complex mixtures using multidimensional CE.
• Development of robust 2D and 3D CE systems with good repeatability and minimal sample loss.
• Advancements in interface design and interface-free techniques, including microfluidic devices.

Conclusions:

• Multidimensional CE offers a powerful strategy for analyzing complex samples with enhanced separation capabilities.
• Ongoing research focuses on improving interfaces, integrating separation steps, and enhancing detection sensitivity.
• The field has matured, enabling the routine analysis of challenging biological and environmental samples.