Molecularly imprinted microparticles for capillary electrochromatography: studies on microparticle synthesis and...

Area of Science:

• Analytical Chemistry
• Separation Science
• Polymer Chemistry

Background:

• Capillary electrochromatography (CEC) is a powerful separation technique.
• Molecularly imprinted polymers (MIPs) offer tailored selectivity for specific analytes.
• Partial filling CEC with MIP microparticles allows for adaptable and reusable separation phases.

Purpose of the Study:

• To investigate the impact of preparation and separation parameters on MIP microparticle performance in CEC.
• To optimize MIP synthesis for enhanced enantiomer separation of propranolol.
• To evaluate the advantages of the partial filling technique in CEC.

Main Methods:

• Synthesis of MIP microparticles using varying template-to-monomer ratios, cross-linkers (EDMA, TRIM, PETEA), and functional monomers.
• Capillary electrochromatography (CEC) using a partial filling technique.
• Systematic variation of CEC separation conditions: organic modifier content, pH, and column temperature.

Main Results:

• Ethyleneglycol dimethacrylate (EDMA) demonstrated superior CEC performance compared to TRIM and PETEA.
• Employing weak functional monomers increased separation efficiency.
• The template-to-functional monomer ratio significantly influenced MIP microparticle performance and size.
• Partial filling enabled adaptable selectivity and MIP phase regeneration without column switching.

Conclusions:

• Optimized MIP microparticles, particularly with EDMA and controlled monomer ratios, significantly enhance CEC enantiomer separation.
• The partial filling technique offers a flexible and efficient approach for utilizing MIPs in CEC.
• This methodology provides a versatile platform for developing customized separation columns for chiral compounds.