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Fused-core, sub-2 microm packings, and monolithic HPLC columns: a comparative evaluation
Richard W Brice1, Xin Zhang, Luis A Colón
1Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260-3000, USA.
Journal of Separation Science
|July 16, 2009
Summary
High-performance liquid chromatography (HPLC) column technologies were compared. Fused-core columns offer efficient, high-speed separations with lower back pressure, outperforming monolithic columns for certain applications.
Area of Science:
- Analytical Chemistry
- Chromatography
Background:
- High-performance liquid chromatography (HPLC) is crucial for chemical analysis.
- Advancements in HPLC column technology aim to improve separation efficiency, speed, and reduce solvent consumption.
Purpose of the Study:
- To compare three HPLC column technologies: monolithic, fused-core particles, and sub-2 micrometer particles.
- To evaluate performance based on van Deemter plots, analysis speed, back pressure, and mobile phase consumption.
Main Methods:
- Evaluation of monolithic, 2.7 micrometer fused-core, and sub-2 micrometer particle HPLC columns.
- Analysis of van Deemter plots, linear velocity, back pressure, and mobile phase usage.
- Separation of basic compounds (tricyclic antidepressants) at high pH.
Main Results:
- Monolithic columns achieved high linear velocities (approx. 12 mm/s) at modest pressure (110 bar) but consumed high mobile phase volumes.
- Fused-core columns provided efficiencies comparable to sub-2 micrometer particles at high flow rates and lower pressures (below 620 bar).
- Monolithic columns lacked pH stability, while 1.7 micrometer hybrid columns excelled in separating basic compounds at high pH.
Conclusions:
- Fused-core columns represent a viable alternative to sub-2 micrometer particles, offering high efficiency and speed with reduced operational pressure.
- Column selection depends on specific application requirements, including pH stability and separation needs.
- Further optimization of HPLC column technologies is essential for advancing analytical capabilities.
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