Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1090, Issue 1-2, Pages 39-57Publisher
ELSEVIER
DOI: 10.1016/j.chroma.2005.06.079
Keywords
adsorption equilibrium; single and competitive adsorption isotherms; frontal analysis; column heterogeneity; affinity energy distribution; retention mechanism; preparative chromatography; silica; discovery-C-18; nortriptyline; amytriptyline; acetonitrile
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The single and the competitive equilibrium isotherms of nortriptyline and amytriptyline were acquired by frontal analysis (FA) on the C-18-bonded discovery column, using a 28/72 (v/v) mixture of acetonitrile and water buffered with phosphate (20 mM, pH 2.70). The adsorption energy distributions (AED) of each compound were calculated from the raw adsorption data. Both the fitting of the adsorption data using multi-linear regression analysis and the AEDs are consistent with a trimodal isotherm model. The single-component isotherm data fit well to the tri-Langmuir isotherm model. The extension to a competitive two-component tri-Langmuir isotherm model based on the best parameters of the single-component isotherms does not account well for the breakthrough curves nor for the overloaded band profiles measured for mixtures of nortriptyline and amytriptyline. However, it was possible to derive adjusted parameters of a competitive tri-Langmuir model based on the fitting of the adsorption data obtained for these mixtures. A very good agreement was then found between the calculated and the experimental overloaded band profiles of all the mixtures injected. (c) 2005 Elsevier B.V. All rights reserved.
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