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Evaluation of a combined linear and nonlinear approach for characterization of adsorption processes in chromatographic systems using modern alkaline stable columns as model
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC.
(English)Manuscript (preprint) (Other academic)
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-166986OAI: oai:DiVA.org:uu-166986DiVA: diva2:479847
Available from: 2012-01-18 Created: 2012-01-18 Last updated: 2012-01-18
In thesis
1. Development and improvement of methods for characterization of HPLC stationary phases
Open this publication in new window or tab >>Development and improvement of methods for characterization of HPLC stationary phases
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

High Performance Liquid Chromatography (HPLC) is a widely used tech-nique both for detecting and purifying substances in academy and in the industry. In order to facilitate the use of, and knowledge in HPLC, character-ization of stationary phases is of utmost importance. Tailor made characteri-zation methods and workflows are steadily increasing the speed and accura-cy in which new separation systems and methods are developed. In the field fundamental separation science and of preparative chromatography there is always the need for faster and more accurate methods of adsorption isotherm determination. Some of that demand are met with the steadily increase of computational power, but the practical aspects on models and methods must also be further developed. These nonlinear characterization methods will not only give models capable of describing the adsorption isotherm but also actual values of local adsorption energies and monolayer saturation capacity of an individual interaction sites etc.The studies presented in this thesis use modern alkali stable stationary phas-es as a model phase, which will give an insight in hybrid materials and their separation mechanism. This thesis will include an update and expansion in using the Elution by Characteristic Points (ECP) method for determination of adsorption isotherms. The precision is even further increased due to the ability to use slope data as well as an increase in usability by assigning a set of guidance rules to be applied when determine adsorption isotherms having inflection points. This thesis will further provide the reader with information about stationary phase characterization and the power of using existing tech-niques; combine them with each other, and also what the expansion of meth-ods can revile in terms of precision and increased usability. A more holistic view of what benefits that comes with combining a non-linear characteriza-tion of a stationary phase with more common linear characterization meth-ods are presented.

Place, publisher, year, edition, pages
Uppsala universitet, 2011. 40 p.
Keyword
Adsorption isotherms, Elution by characteristic points, Inflection points, Single component adsorption, Elution by characteristic points method, Slope data, ECP-slope method, Adsorption, Adsorption energy distribution, Adsorption isotherms, AED, Characterization of adsorption processes, Chromatographic analysis, Chromatography, Hydrophobic-subtraction method (HSM), Hydrophobicity, Linear methods, Linear Models, Liquid chromatography, metoprolol, Non-linear methods, Nonlinear methods, phenol, priority journal, propranolol, Retention mechanism, reversed phase liquid chromatography, Solvation, Subtraction method, Thermodynamics
National Category
Analytical Chemistry Biochemistry and Molecular Biology
Research subject
Chemistry with specialization in Surface Biotechnology
Identifiers
urn:nbn:se:uu:diva-166978 (URN)
Presentation
2011-10-21, C4:305, Husarg. 3, Uppsala, 10:27 (English)
Opponent
Supervisors
Available from: 2012-01-18 Created: 2012-01-18 Last updated: 2012-01-18Bibliographically approved

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