Practical assessment of frictional heating effects and thermostat design on the performance of conventional (3μm and 5μm) columns in reversed-phase high-performance liquid chromatography

Fallas, M. M., Hadley, M. R. and McCalley, D. V. (2009) Practical assessment of frictional heating effects and thermostat design on the performance of conventional (3μm and 5μm) columns in reversed-phase high-performance liquid chromatography. Journal of Chromatography A, 1216 (18). pp. 3961-3969. ISSN 0021-9673

Full text not available from this repository

Publisher's URL: http://dx.doi.org/10.1016/j.chroma.2009.03.007

Abstract

A practical investigation of frictional heating effects in conventional C18 columns was undertaken, to investigate whether problems found for sub-2 μm columns were also present for those of particle size 3 μm and 5 μm and different internal diameter. The influence of a water bath, a still air heater, and a forced air heater on performance was investigated. Heating effects were substantial, with a decrease in k of almost 15% for toluene over the flow rate range 0.4–2.3 mL/min with a 15 cm × 0.46 cm ID column packed with 3 μm particles. Heating effects on retention increased with increasing solute k, with increase in the column ID, with decrease in the column particle size, and with decrease in the set column oven temperature. While the water bath minimised axial temperature gradients and thus its effect on k, radial temperature gradients were potentially serious with this system, especially at high mobile phase velocity, even with columns containing 5 μm particles. In contrast to the effects of axial temperature gradients in 4.6 mm columns, very little difference in Van Deemter plots was noted between the three different thermostats with 2 mm ID columns, even when 3 μm particles were used. However, the efficiency of 2 mm columns for peaks of low or moderate k (k < 4) can be compromised by the extra dead volume introduced by the heating systems, even with conventional HPLC systems with otherwise minimised extra column volume.

Item Type:Article
Uncontrolled Keywords:HPLC, frictional heating, retention, column efficiency
Faculty/Department:Faculty of Health and Applied Sciences > Department of Biological, Biomedical and Analytical Sciences
ID Code:8295
Deposited By: Professor D. Mccalley
Deposited On:12 Jul 2010 08:55
Last Modified:12 Aug 2013 08:00

Request a change to this item

Copyright 2013 © UWE better together