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Size-exclusion electrochromatography with controlled pore flow.

R Stol1, W T Kok, H Poppe

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

Journal of Chromatography. A
|May 19, 2001
PubMed
Summary
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Optimizing the pore-to-interstitial flow ratio in size-exclusion electrochromatography (SEEC) is key for resolution. Applying hydrodynamic flow alongside electric fields effectively controls this ratio, enhancing separation efficiency for various silica particles.

Area of Science:

  • Analytical Chemistry
  • Separation Science

Background:

  • Size-exclusion electrochromatography (SEEC) relies on an optimal pore-to-interstitial flow ratio for maximizing chromatographic resolution.
  • Controlling this flow ratio is crucial for effective separations, particularly with different particle pore sizes.

Purpose of the Study:

  • To investigate two methods for controlling the pore-to-interstitial flow ratio in SEEC: mobile phase ionic strength adjustment and superimposed hydrodynamic flow.
  • To evaluate the efficiency and applicability of these methods using silica particles with 10 nm and 50 nm pores.

Main Methods:

  • Method 1: Modifying mobile phase ionic strength to alter flow ratios.
  • Method 2: Applying external pressure (hydrodynamic flow) in conjunction with electroosmotic flow.
  • Chromatographic analysis using silica particles of 10 nm and 50 nm pore diameters with varying ionic strength mobile phases.

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Main Results:

  • Varying ionic strength effectively adjusted the flow ratio for 10 nm pore particles but was insufficient for 50 nm pore particles.
  • Superimposed hydrodynamic flow (pressure) proved applicable to both particle types, enabling precise control over the pore-to-interstitial flow ratio.
  • Pressurized SEEC significantly improved separation efficiency due to enhanced mass transfer from intra-particle electroosmotic flow, achieving efficiencies comparable to pure SEEC.

Conclusions:

  • Superimposed hydrodynamic flow is a versatile method for optimizing pore-to-interstitial flow ratios in SEEC across different particle types.
  • Pressurized SEEC offers a powerful approach to enhance separation efficiency while minimizing selectivity loss compared to pressure-driven size-exclusion chromatography.