Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1356, Issue -, Pages 96-104Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2014.06.030
Keywords
Gradient chromatography; Computer simulation; Equilibrium dispersive model; Acetonitrile; Distorted gradients; Non-linear solvation strength model
Funding
- University of Tennessee
- Oak Ridge National Laboratory
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Computer calculations of gradient chromatograms were performed by taking into account the adsorption behavior of the strong eluent in RPLC and the true Henry constant of the analytes. This improves the accuracy of classical gradient calculations, which all assume no affinity of the eluent modifier for the stationary phase and that the linear solvation strength model (LSSM) applies. The excess adsorption isotherm of acetonitrile with respect to water was measured by the minor disturbance method onto a Symmetry-C-18 RPLC adsorbent. The variations of the Henry constants of a nine compound mixture with the volume fraction of acetonitrile in the aqueous mobile phase were measured. The equilibrium dispersive model of chromatography combined with orthogonal collocation on finite elements was used to calculate chromatograms of the sample mixture for four gradient times decreasing from 25 to 1 min. The results predict a loss of resolution for the less retained analytes when the gradient times becomes smaller than 4 min. They also predict that this behavior can be eliminated when applying a quadratic gradient profile rather than a classical linear gradient. The predictions were validated by the agreement between the calculated and experimental chromatograms. (C) 2014 Elsevier B.V. All rights reserved.
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