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Performance of HPLC/MS microchips in isocratic and gradient elution modes.
Steffen Ehlert1, Lukas Trojer, Martin Vollmer
1Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Strasse, 35032 Marburg, Germany.
Journal of Mass Spectrometry : JMS
|March 9, 2010
Summary
Optimizing packing density in all-polyimide high-performance liquid chromatography/mass spectrometry (HPLC/MS) microchips significantly enhances chromatographic separation. Densely packed chips show improved peak shape and resolution, crucial for analytical power.
Area of Science:
- Analytical Chemistry
- Separation Science
- Microfluidics
Background:
- Particle-packed microchips are essential for high-performance liquid chromatography/mass spectrometry (HPLC/MS).
- Optimizing packing density is critical for achieving efficient chromatographic separations within these microdevices.
Purpose of the Study:
- To evaluate the chromatographic performance of all-polyimide HPLC/MS microchips packed with C18-silica particles.
- To investigate the impact of packing conditions on hydraulic permeability and separation efficiency.
Main Methods:
- Slurry packing of 3.5 or 5 microm C18-silica particles into all-polyimide HPLC/MS microchips using a custom holder.
- Analysis of hydraulic permeabilities and separation efficiency under isocratic and gradient elution.
- Evaluation of peak shape and chromatographic resolution.
Main Results:
- Packing conditions significantly influence packing density and subsequent HPLC/MS chip performance.
- Densely packed chips demonstrate substantially improved peak shape and chromatographic resolution, even with steep solvent gradients.
- Hydraulic permeability and separation efficiency are directly related to packing density.
Conclusions:
- The quality of chromatographic separation is the primary determinant of the analytical power of HPLC/MS microchips.
- Achieving optimal packing density is key to maximizing the performance of particle-packed HPLC/MS microchips.
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