The mass transfer kinetics in columns packed with Halo-ES shell particles

Area of Science:

• Chromatography
• Separation Science
• Analytical Chemistry

Background:

• Classical Halo shell particles have a mesopore size of 90 Å.
• Understanding mass transfer and diffusion is crucial for optimizing chromatographic separations.

Purpose of the Study:

• To evaluate the performance of new Halo-ES-Peptide shell particles with larger mesopores (160 Å).
• To investigate the impact of increased mesopore size on column efficiency and mass transfer resistance.

Main Methods:

• Systematic measurements of the C term of the van Deemter equation.
• Analysis of Height Equivalent to a Theoretical Plate (HETP) data for various molecules (peptides, proteins, polystyrene standards, small molecules).

Main Results:

• Halo-ES-Peptide particles exhibit a considerable decrease in film mass transfer resistance.
• A 25% reduction in the eddy diffusion (A) term was observed for small molecules compared to classical Halo columns.
• Improved column performance is attributed to increased accessible surface area and reduced eddy diffusion.

Conclusions:

• Larger mesopores in Halo-ES-Peptide particles enhance column efficiency.
• The study demonstrates the benefits of tailored particle design for improved chromatographic separations.
• Reduced mass transfer resistance and eddy diffusion contribute to superior separation performance.