Mobilization in two-step capillary isoelectric focusing: Concepts assessed by computer simulation

Area of Science:

• Analytical Chemistry
• Separation Science

Background:

• Two-step capillary isoelectric focusing (cIEF) is a powerful separation technique.
• The mobilization step is critical for eluting focused analytes.
• Spacer compounds can influence the focusing and mobilization process.

Purpose of the Study:

• To investigate mobilization strategies in two-step capillary isoelectric focusing.
• To analyze the impact of spacer compounds on mobilization dynamics.
• To elucidate the mechanisms of electrophoretic and hydrodynamic mobilization.

Main Methods:

• Dynamic computer simulations were employed.
• Simulations were performed for systems with and without spacer compounds.
• Analysis focused on electroosmosis-free conditions during the first focusing step.

Main Results:

• Electrophoretic mobilization can be induced by applying an electric field.
• Hydrodynamic mobilization involves applying a flow.
• Simulations revealed complexities in electrophoretic mobilization and dispersion during hydrodynamic mobilization.

Conclusions:

• Both electrophoretic and hydrodynamic forces can effectively mobilize analytes after focusing.
• Spacer compounds play a role in the overall separation and mobilization efficiency.
• Computer simulations offer valuable insights into the intricate dynamics of capillary isoelectric focusing mobilization.