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Capillary electrochromatography with macroporous particles.

R Stol1, W T Kok, H Poppe

  • 1Department of Chemical Engineering, University of Amsterdam, The Netherlands.

Journal of Chromatography. A
|September 16, 1999
PubMed
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Macro-porous particles significantly enhance capillary electrochromatography performance. Larger pore sizes and higher buffer concentrations improve separation efficiency and mobile phase velocity, enabling rapid, high-resolution separations.

Area of Science:

  • Analytical Chemistry
  • Separation Science

Background:

  • Capillary electrochromatography (CEC) performance is limited by flow inhomogeneity and mass transfer kinetics.
  • Macro-porous particles offer potential for improved CEC separations.

Purpose of the Study:

  • To investigate the impact of macro-porous particles on CEC performance.
  • To evaluate the effect of pore size and mobile phase composition on separation efficiency and mobile phase velocity.

Main Methods:

  • Testing three reversed-phase stationary phases with pore diameters ranging from 500 Å to 4000 Å.
  • Analyzing separation efficiency (plate height) and mobile phase velocity (H-u plots).
  • Studying the influence of buffer concentration and pore size.

Main Results:

Related Experiment Videos

  • Increased buffer concentrations and larger pore diameters (up to 4000 Å) led to higher mobile phase velocities and separation efficiencies.
  • Columns packed with 7 µm particles with 4000 Å pores achieved up to 430,000 theoretical plates/m.
  • Reduced plate heights as low as 0.34 were observed, indicating significant flow through particle pores.
  • No minimum in the H-u plot was observed up to 3.3 mm/s for 4000 Å pores, suggesting axial diffusion dominance.

Conclusions:

  • Macro-porous particles enhance CEC by reducing flow inhomogeneity and improving mass transfer.
  • Optimized pore size and mobile phase conditions enable high-efficiency and fast separations in CEC.
  • CEC with macro-porous particles demonstrates potential for both high-resolution and rapid analytical separations.