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Switching solvent and enhancing analyte concentrations in small effluent fractions using in-column focusing
H C van de Ven1, A F G Gargano1, Sj van der Wal2
1University of Amsterdam, Faculty of Science, Science Park 904, 1098 XH Amsterdam, The Netherlands; TA-COAST, Science Park 904, Amsterdam, The Netherlands.
Journal of Chromatography. A
|December 25, 2015
Summary
This study introduces a novel liquid chromatography method using temperature changes for solvent switching and analyte focusing. This technique effectively transfers and concentrates analytes by manipulating retention on a trap column.
Area of Science:
- Analytical Chemistry
- Chromatography
Background:
- Liquid chromatography often requires solvent switching for optimal separation.
- Focusing analyte fractions is crucial for sensitivity and resolution.
Purpose of the Study:
- To present a new method for solvent switching and analyte focusing in liquid chromatography.
- To demonstrate the principle using temperature modulation in back-flush mode.
Main Methods:
- Utilizing temperature-dependent retention on a trap column.
- Performing analyte loading at a higher temperature and elution at a lower temperature.
- Employing back-flush mode for solvent transfer and focusing.
Main Results:
- Successful solvent switching and focusing of small aromatic molecules (toluene, p-xylene, benzophenone).
- Demonstrated analyte transfer from loading to elution solvent.
- Achieved significant focusing when using a stronger desorption solvent.
Conclusions:
- Temperature-based retention modulation is an effective strategy for solvent switching and analyte focusing.
- This approach enhances analytical capabilities in liquid chromatography.
- The method shows promise for improved separation and detection.
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