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Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides
Published on: July 14, 2015
Dynamically coated silica monolith with ionic liquids for capillary electrochromatography.
Yun Tian1, Rui Feng, Liping Liao
1Department of Chemistry, Wuhan University, Wuhan, PR China.
Electrophoresis
|July 26, 2008
Summary
A novel ionic liquid dynamic coating on a silica monolithic column enhances capillary electrochromatography separations. This method offers improved repeatability and efficient separation of phenols and nucleoside monophosphates.
Area of Science:
- Analytical Chemistry
- Separation Science
Background:
- Capillary electrochromatography (CEC) is a powerful separation technique.
- Silica monolithic columns offer advantages in CEC but require surface modification for optimal performance.
Purpose of the Study:
- To develop a new dynamic coating for silica monolithic columns using an ionic liquid.
- To evaluate the performance of this modified column for the separation of phenols and nucleoside monophosphates.
Main Methods:
- Dynamic coating of a silica monolithic column with 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]).
- Capillary electrochromatography analysis of phenols and nucleoside monophosphates.
- Investigation of electroosmotic flow (EOF) behavior with varying [BMIM][BF4] concentrations.
Main Results:
- Satisfactory run-to-run and column-to-column repeatability for phenol migration times (RSD < 0.90% and 4.31%).
- Anodic EOF was observed, increasing with [BMIM][BF4] concentration up to 120 mM, then leveling off due to saturation.
- Efficient separation of phenols and nucleoside monophosphates was achieved, outperforming unmodified and fused-silica columns.
Conclusions:
- The [BMIM][BF4] dynamic coating provides excellent performance for CEC separations.
- Hydrophobic interactions and electrostatic attractions govern the retention mechanisms for phenols and nucleoside monophosphates, respectively.
- The modified monolithic column offers a robust and efficient platform for analyzing complex mixtures.
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