One-step strategy for the synthesis of a derivatized cyclodextrin-based monolithic column

Area of Science:

• Analytical Chemistry
• Materials Science
• Separation Science

Background:

• Cyclodextrins (CDs) are widely used in chromatography due to their unique molecular recognition capabilities.
• Developing efficient and versatile methods for preparing functionalized CD-based chromatographic materials is crucial for advancing separation technologies.

Purpose of the Study:

• To develop a novel "one-step" strategy for preparing derivatized beta-cyclodextrin (β-CD) functionalized monolithic columns.
• To evaluate the performance of these β-CD monolithic columns in different liquid chromatography modes.

Main Methods:

• Synthesis of derivatized β-CD monomers via click chemistry between propargyl methacrylate and mono-6-azido-β-CD.
• Functionalization of β-CD monomers through sulfonation or methylation.
• Preparation of monolithic columns via in situ copolymerization of derivatized β-CD monomers and ethylene glycol dimethacrylate.
• Characterization of monomers using Fourier transform infrared spectroscopy and mass spectrometry.
• Evaluation of monolith properties and column performance using scanning electron microscopy and micro high performance liquid chromatography.

Main Results:

• Successfully synthesized sulfated and methylated β-CD monomers.
• Prepared β-CD functionalized monolithic columns using a facile one-step procedure.
• Demonstrated the application of sulfated β-CD monoliths in hydrophilic interaction liquid chromatography for separating nucleosides and small peptides.
• Showcased the utility of methylated β-CD monoliths in capillary reversed-phase liquid chromatography for separating nonpolar compounds and drug enantiomers.

Conclusions:

• The "one-step" click chemistry strategy provides an efficient route for preparing derivatized β-CD functionalized monolithic columns.
• These β-CD monolithic columns exhibit excellent performance in both hydrophilic interaction and reversed-phase liquid chromatography.
• The developed strategy holds significant potential for the synthesis of a wide range of derivatized CD-based methacrylate monoliths for various separation applications.