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Silica xerogel as a continuous column support for high-performance liquid chromatography
1Hoechst Marion Roussel, Analytical and Structural Sciences, 2110 East Galbraith Road, Cincinnati, Ohio 45215.
Analytical Chemistry
|May 31, 2011
Summary
This study introduces a novel continuous silica xerogel column for reversed-phase HPLC. While exhibiting high permeability, its efficiency is impacted by xerogel morphology, suggesting avenues for performance enhancement in chromatographic separations.
Area of Science:
- Analytical Chemistry
- Chromatography
- Materials Science
Background:
- High-performance liquid chromatography (HPLC) relies on efficient stationary phases.
- Continuous columns offer potential advantages over packed beds.
- Silica xerogels present a tunable material for chromatographic applications.
Purpose of the Study:
- To evaluate the chromatographic performance and permeability of a continuous silica xerogel column.
- To investigate the impact of xerogel morphology on column efficiency.
- To demonstrate the applicability of the column in gradient elution mode.
Main Methods:
- Synthesis of a porous silica xerogel support within a fused silica tube.
- Derivatization of the xerogel with dimethyloctadecylchlorosilane for reversed-phase applications.
- Chromatographic testing under reversed-phase HPLC conditions, including gradient elution.
Main Results:
- Achieved a plate height of approximately 65 μm at optimal linear velocity.
- Demonstrated column efficiencies of 5000 and 13,000 plates/meter for ethyl benzoate and naphthalene, respectively.
- Observed high column permeability with a back pressure of 632 psi at 10 μL/min using a 95% aqueous mobile phase.
- Identified xerogel morphology as a key factor influencing column efficiency.
Conclusions:
- The continuous silica xerogel column shows promising permeability for HPLC.
- Further optimization of xerogel morphology is needed to enhance chromatographic efficiency.
- The column is suitable for gradient elution, particularly for analyzing polycyclic aromatic hydrocarbons.
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