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Curtain Flow Column: Optimization of Efficiency and Sensitivity
Published on: June 12, 2016
Columns and optimum gradient conditions for fast second-dimension separations in comprehensive two-dimensional liquid
1Department of Analytical Chemistry, University of Pardubice, Pardubice, Czech Republic.
Journal of Separation Science
|July 19, 2012
Summary
Gradient elution in two-dimensional liquid chromatography (LC) significantly enhances peak capacity. A new strategy optimizes the second-dimension gradient for faster, more resolved separations of complex samples like antioxidants.
Area of Science:
- Analytical Chemistry
- Chromatography
Background:
- Gradient elution offers higher peak capacity than isocratic elution in liquid chromatography (LC).
- Online comprehensive two-dimensional LC (2D-LC) requires fast separations in the second dimension, limited by fraction cycle times.
Purpose of the Study:
- To compare the suitability of core-shell and monolithic columns for fast gradients in 2D-LC.
- To develop a new strategy for optimizing the second-dimension gradient in 2D-reversed-phase systems.
- To improve resolution, peak capacity, and retention space coverage in 2D-LC separations.
Main Methods:
- Comparison of five commercial core-shell columns and one monolithic column for fast gradient separations.
- Development of a strategy to adjust the second-dimension gradient range using retention data from sample standards and alkylbenzene calibration.
- Application of optimized single-step or segmented gradients to separate phenolic acids and flavonoids.
Main Results:
- Core-shell and monolithic columns were evaluated for fast gradient performance in the second dimension.
- A novel strategy for adjusting the second-dimension gradient range was developed and validated.
- Optimized gradients significantly improved resolution, separation time, and coverage of the 2D retention plane.
Conclusions:
- Gradient elution is crucial for enhancing peak capacity in 2D-LC.
- The developed gradient optimization strategy improves 2D-LC separation efficiency and sample coverage.
- This approach is effective for analyzing complex natural product mixtures like phenolic acids and flavonoids.
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