Cholesterol-based polymeric monolithic columns for capillary liquid chromatography. Part II.

Area of Science:

• Chromatography
• Materials Science
• Analytical Chemistry

Background:

• Development of novel stationary phases is crucial for improving chromatographic separations.
• Cholesterol-based materials offer unique properties for chromatographic applications.

Purpose of the Study:

• To present a second part of research on cholesterol-based polymeric monolithic stationary phases.
• To evaluate the performance of these phases in capillary columns for various analytes.

Main Methods:

• Synthesis of cholesterol-based polymeric monolithic stationary phases.
• Preparation of capillary columns packed with the monolithic phase.
• Chromatographic separation of alkylbenzenes, steroid hormones, and polycyclic aromatic hydrocarbons.
• Investigation of thermal stability and re-equilibration properties.

Main Results:

• The capillary columns demonstrated successful separations of target analytes under isocratic and gradient elution.
• Excellent thermal stability was observed, with retained selectivity and efficient separations from 20 to 100°C.
• Non-linear van't Hoff plots suggest liquid crystal properties influencing retention.
• Columns exhibited fast re-equilibration and stability under high flow rates, high acetonitrile content, and high temperatures.

Conclusions:

• Cholesterol-based polymeric monolithic capillary columns are effective for diverse chromatographic separations.
• These columns offer superior thermal stability and rapid re-equilibration, outperforming conventional phases.
• The unique properties of cholesterol contribute to the observed chromatographic behavior and stability.