Comparison of Adsorption Isotherms of Methylxanthines on C18 Column |
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Authors: | BI Wen-tao CHOI Dae Ki and ROW Kyung Ho |
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Institution: | 1. Department of Chemical Engineering, Inha University, Incheon 402-751, Korea;
2. Center for Fuel Cell Research, Korea Institute of Science and Technology, Seoul 136-791, Korea |
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Abstract: | A comparison of the adsorption isotherms of caffeine, theophylline and theobromine and the competitive adsorption of the three compounds on a C 18 column were investigated. The experimental parameters of the equilibrium isotherms were estimated by linear and nonlinear regression analyses. The linear equation as a function of the adsorption concentration of the single compound in its solution and the competitive adsorption of a single compound in a mixed solution were then determined. The adsorption equilibrium data were then correlated to the linear, Langmuir, Freundlich, Langmuir-Freundlich and stoichiometric displacement theory for adsorption(SDT-A) isotherm models. The mixed compounds of the three compounds were competitively adsorbed on the C 18 particles. The expression of stoichiometric displacement theory for adsorption was found to be more suitable for adsorption of methylxanthines on a C 18 column. |
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Keywords: | Adsorption isotherm Methylxanthine High-performance liquid chromatography |
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