Core-shell particles: preparation, fundamentals and applications in high performance liquid chromatography

Area of Science:

• Analytical Chemistry
• Separation Science
• Materials Science

Background:

• High-Performance Liquid Chromatography (HPLC) faces challenges in achieving fast and efficient separations without excessive operating pressures.
• Traditional totally porous particles often require high pressures for rapid analysis, limiting instrumentation and sample throughput.
• Core-shell silica microspheres, featuring a solid core and porous shell, have emerged as a promising alternative.

Purpose of the Study:

• To review the preparation methods and fundamental principles behind the superior performance of core-shell silica particles in chromatography.
• To compare the efficiency and pressure characteristics of core-shell particles with totally porous silica particles and monolithic columns.
• To explore the applications of core-shell particle-packed columns in various liquid chromatography techniques for diverse sample types.

Main Methods:

• Discussion of core-shell particle synthesis, focusing on silica-based materials for chromatography.
• Analysis of performance based on van Deemter equation and kinetic plots to explain low back pressure.
• Comparative evaluation of core-shell columns against totally porous and monolithic columns.

Main Results:

• Core-shell particles demonstrate enhanced separation efficiency and speed with reduced back pressure compared to totally porous particles.
• The unique particle structure minimizes mass transfer resistance, leading to improved chromatographic performance.
• Successful applications across various liquid chromatography modes for small molecules, large molecules, and complex mixtures were illustrated.

Conclusions:

• Core-shell silica microspheres provide a significant advancement in HPLC, enabling faster and more efficient separations at lower pressures.
• These particles offer a compelling alternative to traditional stationary phases, broadening the scope of chromatographic analysis.
• Future developments in core-shell particle technology hold promise for further innovations in separation science.