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Dissertations / Theses on the topic 'Liquid chromatography'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Li, Zhiguo. "High-performance liquid chromatography analysis of fatty acids and mathematical modeling of liquid chromatography." Ohio : Ohio University, 2001. http://www.ohiolink.edu/etd/view.cgi?ohiou1179157379.

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2

Mekaoui, Nazim. "Contribution à l'étude de la chromatographie à contre-courant : partage de composés ionisables, nouvelles colonnes et purification séquentielles." Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10249/document.

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La chromatographie à contre courant (CCC) est une technique de purification chimique préparative quitravaille avec un système biphasique liquide. Une phase est la phase mobile, l'autre phase est la phasestationnaire. Il n'y a aucun support solide: un champ de force centrifuge est utilisé pour maintenir en place laphase stationnaire. Ce travail est une contribution à l'étude de la purification préparative par CCC. Après uneimportante étude bibliographique des procédés de purification en continu tant en CCC qu'autres, il est montréque la méthode dite "multi-dual-mode", ou MDM, est une solution p

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3

Jeong, Lena N. "Development of General Purpose Liquid Chromatography Simulator for the Exploration of Novel Liquid Chromatographic Strategies." VCU Scholars Compass, 2017. http://scholarscompass.vcu.edu/etd/5079.

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The method development process in liquid chromatography (LC) involves optimization of a variety of method parameters including stationary phase chemistry, column temperature, initial and final mobile phase compositions, and gradient time when gradient mobile phases are used. Here, a general simulation program to predict the results (i.e., retention time, peak width and peak shape) of LC separations, with the ability to study various complex chromatographic conditions is described. The simulation program is based on the Craig distribution model where the column is divided into discrete distance

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4

Andersson, David. "Simulation Testbed for Liquid Chromatography." Thesis, Umeå universitet, Institutionen för fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-185024.

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The stlc package is proposed as a tool for simulation of liquid chromatography by implementing several lumped kinetic models which combine diffusive mass transport and adsorption isotherm equations. The purpose of the package is to provide computationally efficient approximations to the general rate model of chromatography. Orthogonal collocation is used to discretize the spatial domain and the resulting system of ordinary differential equations is evaluated by one of several solvers made available in the package. Comparisons between numerical and analytical Laplace domain solutions for valu

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5

Waichigo, Martin M. "Alkylammonium Carboxylates as Mobile Phases for Reversed-Phase Liquid Chromatography." Miami University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=miami1134142423.

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6

Kirk, John Daniel. "Particle beam LC/MS with fast atom bombardment." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/27127.

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7

Hemström, Petrus. "Hydrophilic Separation Materials for Liquid Chromatography." Doctoral thesis, Umeå universitet, Kemi, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1350.

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The main focus of this thesis is on hydrophilic interaction chromatography (HILIC) and the preparation of stationary phases for HILIC. The mechanism of HILIC is also discussed; a large part of the discussion has been adapted from a review written by me and professor Irgum for the Journal of Separation Science (ref 34). By reevaluating the literature we have revealed that the notion of HILIC as simply partitioning chromatography needed modification. However, our interest in the HILIC mechanism was mainly inspired by the need to understand how to construct the optimal HILIC stationary phase. The

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8

Hendriks, Margriet Megtilda Wilhelmina Bartholomea. "Nonlinear retention modeling in liquid chromatography." [S.l. : [Groningen] : s.n.] ; [University Library Groningen] [Host], 1996. http://irs.ub.rug.nl/ppn/148573207.

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9

Hemström, Petrus. "Hydrophilic separation materials for liquid chromatography /." Umeå : Department of Chemistry, Umeå University, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1350.

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10

Hickling, Simon James. "Liquid crystal polymers for gas chromatography." Thesis, University of Bath, 1999. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760726.

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11

Harvey-Doyle, Fiona. "Resistively heated columns for liquid chromatography." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/6370.

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Interest in temperature as a modifier in HPLC separations has increased markedly recently due to miniaturisation, new stable hybrid stationary phases and the use of superheated water as an eluent. However, for decades temperature has generally been regarded as a parameter that should be kept constant in LC separations for retention reproducibility but there is now a mountain of journal papers supporting the use of this variable. Currently, the limit of implementation usually arises from the lack of LC ovens on the market capable of high temperature applications. This led to the development of

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12

Wilson, William Henry. "Packed capillary columns for liquid chromatography." Diss., Virginia Tech, 1990. http://hdl.handle.net/10919/37746.

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13

Shih, Victor Chi-Yuan Tai Yu-Chong. "Temperature-controlled microchip liquid chromatography system /." Diss., Pasadena, Calif. : Caltech, 2006. http://resolver.caltech.edu/CaltechETD:etd-04182006-162552.

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14

Sharma, Sonika. "Hand-portable Capillary Liquid Chromatography Instrumentation." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/6164.

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This dissertation focuses on the development of hand-portable capillary liquid chromatography (LC) instrumentation. In this work, battery-operable nano-flow pumping systems (isocratic and gradient) were developed and integrated with portable UV-absorption detectors for capillary LC. The systems were reduced in size to acceptable weights and power usage for field operation. A major advantage of the pumps is that they do not employ a splitter, since they were specifically designed for capillary column use, thereby greatly reducing solvent consumption and waste generation. UV-absorption detectors

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15

Wong, Victor, University of Western Sydney, of Science Technology and Environment College, and of Science Food and Horticulture School. "A fundamental study towards improving the performance of liquid chromatographic separation." THESIS_CSTE_SFH_Wong_V.xml, 2003. http://handle.uws.edu.au:8081/1959.7/467.

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The three factors of the resolution (Rs)equation(see Equation 1.1)were explored in this thesis. During the course of the research project, an important aim was to explore separation processes that would lead to an increase in productivity without sacrificing Rs. To that end, an increase in the retention factor (k)to enhance Rs was deemed detrimental to the cycle time, hence the production rate, particularly when preparative separations are involved. Consequently the primary objectives were to (i)prepare more efficient columns and (ii)investigate new strategies in manipulating selectivity. The

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16

DONALD, GREGORY THOMAS. "Model Chiral Ionic Liquids for High Performance Liquid Chromatography Stationary Phases." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1214325450.

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17

McBrady, Adam Dewey. "Microfabricated chromatographic instrumentation for micro total analysis systems /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/8570.

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18

Scullion, Simon Daniel. "The analysis of surfactants and their determination in surface water by liquid chromatography and liquid chromatography-mass spectrometry." Thesis, Sheffield Hallam University, 1997. http://shura.shu.ac.uk/20338/.

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Linear alkylbenzene sulphonates (LAS) and alkylphenol polyethoxylates (APEO), the surfactants most used in this country, are complex mixtures of oligomers and homologues. Due to their excellent surface active properties they are widely used as ingredients in many detergent formulations both in the home and more importantly in industry. For several years research has been carried out in order to understand the environmental impact of these widely used groups of compounds. However, some of the analytical techniques developed are not able to give reliable information concerning individual oligome

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19

Bhattacharjee, Rathindra Chandra. "Development of a sensitive and stereoselective high performance liquid chromatographic assay method for propafenone enantiomers in human plasma." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/27800.

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Propafenone is a new class 1C antiarrhythmic agent with additional calcium antagonistic and beta-blocking activities. Clinically it is effective in the treatment of supraventricular and ventricular tachycardia, atrial and ventricular fibrillation, ventricular premature contractions and for the management of Wolf-Parkinson-White syndrome. In North America it is still an investigational drug. Propafenone is a chiral drug and is used clinically in the racemic form. The enantiomers of numerous chiral drugs have been shown to differ in their disposition kinetics in the body due to their stereosele

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20

Jedrzejewski, Paul T. "Investigation of mass spectrometric interfaces for supercritical fluid chromatography and liquid chromatography." Diss., This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-08282003-155244/.

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21

Yla-Maihaniemi, Pirre Paivikki. "A novel method for investigating solid-liquid interactions : inverse liquid chromatography." Thesis, Imperial College London, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.429885.

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22

Norcio, Lawrence P. "Stability studies of coal liquid products using high performance liquid chromatography." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=984.

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Thesis (Ph. D.)--West Virginia University, 1999.<br>Title from document title page. Document formatted into pages; contains xi, 152 p. : ill. (some col.) Vita. Includes abstract. Includes bibliographical references (p. 127-133).

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23

Monser, Lotfi Ibrahim. "Modified porous graphitic carbon for liquid chromatography." Thesis, University of Hull, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318379.

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24

Abid, F. M. "High performance liquid chromatography : theory and applications." Thesis, Swansea University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.635837.

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A detailed study was undertaken of both the individual and combined effects of pH, temperature and flow rate on the retention volumes of underivatised amino acids. The relative merits of 3-dimensional S-window diagrams to locate the optimum conditions for the separation of amino acids on a stationary phase comprising 5μ ODS has been successfully performed. The enthalpies of retention of transfer from stationary phase to mobile phase for the amino acids have been measured from the chromatographic data. An isocratic study of the separation of phenylthiohyddation (PTH) amino acids using a 3μ MOS

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25

Cowen, Thomas. "Some studies in reversed phase liquid chromatography." Thesis, University of Salford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305175.

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26

Airiau, Christian Y. "Application of chemometrics to hyphenated liquid chromatography." Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392922.

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27

Ortman, Jerker. "Improvement of conductivity measurement in liquid chromatography." Thesis, Uppsala universitet, Institutionen för elektroteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-448059.

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In liquid chromatography the ability to measure the conductivity is essential toreach a good result. This is done by applying a current through the electrolyte ofinterest and measuring the voltage drop over the electrolyte. The conductivity isthen calculated with the known current and the measured voltage. It is of highimportance that it is an AC-current to avoid polarization at the electrodes of thesensor. With the AC-current a frequency must be chosen to reach the most accurateresult. This is hypothetically done where the phase is as low as possible. An electricequivalent circuit and previou

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28

Leow, Pei Ling. "In-column electrochemical detection for liquid chromatography." Thesis, Imperial College London, 2009. http://hdl.handle.net/10044/1/5295.

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This research focuses on the development of whole column detection (WCD) for liquid chromatography (LC). The WCD uses electrochemical techniques for detecting the analytes passing through the separation column. Electrode array for in-column electrochemical detection (ICED) is fabricated along the separation column to enable whole column separation monitoring and allow better understanding on the affinity of particular analyte to the stationary and mobile phases. Numerical models were built to understand the feasibility and differences of electrochemical detection within an unpacked and packed

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29

Xiang, Yanqiao. "Capillary Liquid Chromatography Using Micro Size Particles." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd531.pdf.

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30

Dotlich, Erin Michele. "ALKYLAMMONIUM FORMATE IONIC LIQUIDS AS SOLVENTS FOR FLUORESCENCE AND LIQUID CHROMATOGRAPHY METHODS." Miami University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=miami1208983119.

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31

Wong, Victor. "A fundamental study towards improving the performance of liquid chromatographic separation." Thesis, View thesis, 2003. http://handle.uws.edu.au:8081/1959.7/467.

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The three factors of the resolution (Rs)equation(see Equation 1.1)were explored in this thesis. During the course of the research project, an important aim was to explore separation processes that would lead to an increase in productivity without sacrificing Rs. To that end, an increase in the retention factor (k)to enhance Rs was deemed detrimental to the cycle time, hence the production rate, particularly when preparative separations are involved. Consequently the primary objectives were to (i)prepare more efficient columns and (ii)investigate new strategies in manipulating selectivity. The

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32

Forssén, Patrik. "Adsorption Isotherm Parameter Estimation in Nonlinear Liquid Chromatography." Doctoral thesis, Uppsala universitet, Avdelningen för teknisk databehandling, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5971.

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This thesis concerns the development and validation of methods for the industrially important area of adsorption isotherm parameter estimation in preparative, nonlinear high performance liquid chromatography (HPLC). Preparative chromatography is a powerful separation method to get pure compounds from more or less complex liquid mixtures, e.g., mixtures of mirror-image molecules. Computer simulations can be used to optimize preparative chromatography, but then competitive adsorption isotherm parameters are usually required. Here two methods to estimate adsorption isotherm parameters are treated

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33

Rousu, T. (Timo). "Liquid chromatography–mass spectrometry in drug metabolism studies." Doctoral thesis, Oulun yliopisto, 2012. http://urn.fi/urn:isbn:9789514298172.

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Abstract Drug metabolite profiling and identification studies are nowadays regularly conducted with liquid chromatography (LC) coupled with mass spectrometry (MS) as an analytical tool. The speed, selectivity and sensitivity of modern LC–MS instruments have been significantly increased in recent years. Especially the use of ultra-high-performance LC (UHPLC) in combination with a modern high-resolution MS instrument offers high full scan detection sensitivity, mass accuracy and the detection of both expected and unexpected metabolites in a single LC–MS run. The present study showed that no sing

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34

Tam, Chung Ming. "Use of liquid chromatography in membrane material characterization." Thesis, University of Ottawa (Canada), 1989. http://hdl.handle.net/10393/5701.

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35

Forssén, Patrik. "Adsorption isotherm parameter estimation in nonlinear liquid chromatography /." Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5971.

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36

Fitzpatrick, Fiona Patricia. "Interactive liquid chromatography for the characterisation of polymers." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2004. http://dare.uva.nl/document/74455.

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37

Enetoft, Daniel. "Automating analysis of two-dimensional liquid chromatography data." Thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-95339.

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A biomarker is a cellular or molecular indicator of exposure, disease, or susceptibility to disease. Ones a biomarker has been confirmed, it can be used to diagnose disease risk or to tailor treatment for it. A protein is a possible biomarker. These proteins can be found by several methods, where two-dimensional liquid chromatography (2DLC) is one of the newer approaches. This technique is capable of separating thousands of proteins. To find the proteins whose abundance differs in different groups, the data must be carefully analyzed. Due to the amount of proteins that can be found by the meth

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38

Huft, Jens. "Microfluidic technologies for the integration of liquid chromatography." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44898.

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The microfabrication technique of Multilayer Soft Lithography (MSL) has emerged as the dominant platform for the development of microfluidic devices in biomedical research. However, Multilayer Soft Lithography, as originally developed, has technological limitations that restrict its effectiveness and versatility in implementing laboratory operations on chip. This thesis solves two of these limitations, namely that channel routing is restricted to planar geometries and that no established methods exist for creating solid-phase columns needed to perform on-chip analytical and preparative separat

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39

Edwardson, P. A. D. "High Performance Liquid Chromatography of polynucleotides and proteins." Thesis, London School of Hygiene and Tropical Medicine (University of London), 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376534.

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40

Zhu, Cuiru. "Elevated temperature liquid chromatography and peak shape analysis." Thesis, University of York, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413172.

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41

Cooper, J. D. H. "Automated sample preparation for high pressure liquid chromatography." Thesis, De Montfort University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292855.

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42

Dias, H. "Gas and liquid chromatography on porous graphitic carbon." Thesis, University of Edinburgh, 1990. http://hdl.handle.net/1842/13643.

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A new hydrophobic support material, Porous Graphitic (or Graphitised) Carbon (PGC) has been studied using both Liquid (LC) and Gas Chromatography (GC). The heat of adsorbtion (AH) of typical LC solvents determined on PGC, using GC, showed that AH increased with the molecular area (Ax) of solvents for well graphitised carbons, but that AH/Ax values were similar for all solvents studied. By definition, AH/Ax is a measure of eluotropic strength. The results reveal that a strong eluotropic series does not exist on carbon. A strong eluotropic series does exist on silica. In this case, AH/Ax values

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43

Wan, Quian-Hong. "Surface modification of porous graphite for liquid chromatography." Thesis, University of Edinburgh, 1992. http://hdl.handle.net/1842/13187.

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Surface modification of porous graphite has been studied in detail by liquid chromatography. The non-polar nature of the graphite provides the basis for adsorptive modification by which the graphite surface is either deactivated or functionized. While the elimination of geometric heterogeneity is achieved by adsorption of trace polyaromatic compounds, the specialist in selectivity is conferred to the graphite by a monolayer coating of modifiers. A number of strategies are used for different purposes. These include dynamic coating, insoluble coating and cross-linked coating. The chromatographic

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44

Dolci, Monica. "Liquid chromatography-mass spectrometry analysis of oligolactic acids." Thesis, Loughborough University, 2008. https://dspace.lboro.ac.uk/2134/35549.

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The project has demonstrated the application of liquid chromatography coupled to mass spectrometry (LC-MS) for the characterisation of oligolactic acids (OLAs), employed as pharmaceutical excipients in metered dose inhalers. OLAs proved to be difficult to characterise because of their complexity, which was ascribed. to the presence of repeated structural monomeric units and a nonrepeating moiety (the head group). Furthermore, during the course of method development the potential presence of degradation products and impurities had to be considered for quality control purposes. Various LC-MS met

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45

Aggarwal, Pankaj. "High-Performance Polymer Monoliths for Capillary Liquid Chromatography." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/4236.

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This dissertation focuses on improving the chromatographic efficiency of polymeric organic monoliths by characterizing and optimizing the bed morphology. In-situ characterization techniques such as capillary flow porometry (CFP), 3-dimensional scanning electron microscopy (3D SEM) and conductivity measurements were developed and implemented to quantitatively characterize the morphology of poly(ethylene glycol) diacrylate (PEGDA) monoliths. The CFP measurements for monoliths prepared by the same procedure in capillaries with different diameters (i.e., 75, 150, and 250 μm) clearly showed a chang

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46

Matos, Ana Karollyna Alves de [UNESP]. "Influência da vinhaça e da palhada de cana-de-açúcar na sorção de herbicidas aplicados em diferentes solos." Universidade Estadual Paulista (UNESP), 2014. http://hdl.handle.net/11449/110931.

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Made available in DSpace on 2014-12-02T11:16:45Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-07-10Bitstream added on 2014-12-02T11:21:41Z : No. of bitstreams: 1 000800265.pdf: 1317086 bytes, checksum: 617587c5dc929a7726bd7a48f2571ce3 (MD5)<br>O sistema de produção com ou sem a pres ença de palhada, bem como, a aplicação de vinhaça nos canaviais, podem levar a alterações nas propriedades do solo e influenciar a disponibilidade dos herbicidas na solução do solo. Diante disto, o presente trabalho teve por objetivo avaliar a influência d a água, água após passar pela palha de cana - de

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47

Matos, Ana Karollyna Alves de 1991. "Influência da vinhaça e da palhada de cana-de-açúcar na sorção de herbicidas aplicados em diferentes solos /." Botucatu :, 2014. http://hdl.handle.net/11449/110931.

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Orientador: Caio Antonio Carbonari<br>Coorientador: Edivaldo Domingues Velini<br>Banca: Carlos Gilberto Raetano<br>Banca: Fernando Tadeu de Carvalho<br>Resumo: O sistema de produção com ou sem a pres ença de palhada, bem como, a aplicação de vinhaça nos canaviais, podem levar a alterações nas propriedades do solo e influenciar a disponibilidade dos herbicidas na solução do solo. Diante disto, o presente trabalho teve por objetivo avaliar a influência d a água, água após passar pela palha de cana - de - açúcar e vinhaça na disponibilidade na solução do solo dos herbicidas amicarbazone, clomazon

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48

Embree, Leanne. "Development of a high-performance liquid chromatographic assay for human chorionic gonadotropin as an alternative to the official United States pharmacopeial animal assay." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24637.

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Human chorionic gonadotropin (HCG), a glycoprotein hormone with two nonidentical subunits, is produced by chorionic tissue in pregnant women and by neoplastic tissue containing chorionic elements. It is used in the treatment of male hypogonadism and female sub-fertility. Quantitation of HCG is used to monitor therapy, diagnose various disease states and diagnose and monitor pregnancy. Low levels of HCG in the early and late stages of pregnancy and in various disease states has prompted the development of extremely sensitive assay procedures. Clinically, radioimmunoassay methods are most frequ

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49

Smith, Anita Mohler. "Objective judgement of cheese varieties by multivariate analysis of HPLC profiles." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26535.

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An objective analytical method was developed to characterize the taste profiles of five cheese varieties. Nonvolatile water extracts of Cheddar, Edam, Gouda, Swiss, and Parmesan cheeses were analyzed by high performance liquid chromatography (HPLC) with a reversed phase column. The HPLC operating conditions were determined with Mapping Super-Simplex followed by Centroid Mapping Optimization. A ternary gradient elution system was used with an Adsorbosphere C8 column to resolve a maximum number of components. The optimum solvent volume ratio was 96.8 : 1.2 : 2.0 for trifluoroacetic acid (0.1%),

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50

Shekhawat, Lalita Kanwar. "Modeling of liquid chromatography empirical and mechanistic modeling approaches." Thesis, IIT Delhi, 2019. http://eprint.iitd.ac.in:80//handle/2074/8051.

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