Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 887, Issue 1-2, Pages 245-252Publisher
ELSEVIER
DOI: 10.1016/S0021-9673(99)01129-2
Keywords
temperature effects; temperature programming; electrochromatography
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In electrochromatography, solvent electrophoretic mobility and solute partitioning are temperature dependent processes. If temperature variations are controlled, solute selectivity and analysis times can be tailored. In this study the feasibility of temperature programming in capillary electrochromatography (CEC) was demonstrated using a reversed-phase CEC mode. The outcome of programmed separations was compared with isothermal, isocratic and isorheic (constant flow) separations. The combined effects of column temperature and mobile phase flow-rate changes during the separation run, resulted in up to a 50% reduction in the separation run time, without adversely affecting the quality of separation. For capillary electrochromatography, temperature programming may be a valuable alternative to solvent programming modes because of the great technical difficulties associated with carrying out solvent gradient elution. (C) 2000 Elsevier Science BN. All rights reserved.
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