Novel Chromatographic Separations Through Dynamically Controlled Stationary Phase Removal

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dc.contributor.advisorThurbide, Kevin B.
dc.contributor.authorSaowapon, Matthew Tatchai
dc.contributor.committeememberKimura-Hara, Susana
dc.contributor.committeememberShi, Yujun
dc.contributor.committeememberThangadurai, Venkataraman
dc.date2019-06
dc.date.accessioned2019-05-03T16:32:36Z
dc.date.available2019-05-03T16:32:36Z
dc.date.issued2019-05-02
dc.description.abstractThis thesis explores the removal of a water stationary phase as a novel means of tuning separations in supercritical fluid chromatography. The first area investigated is the systematic dehydration of the stationary phase to achieve gradient style elutions. Here, the gradual removal of the water stationary phase is used to maintain the separation of early eluting analytes while speeding up the elution of well retained analytes. The dehydration gradient allows analyses to be performed more rapidly and is shown to reproducibly and predictably adjust analyte retention times. Additionally, the removal of the stationary phase is observed to focus the peaks of well retained compounds, making them sharper and easier to quantify. Together, these effects are used to facilitate the analysis of several polar and ionizable compounds, which are typically well retained in supercritical fluid chromatography and elute with poor peak shape. Thus, the dehydration gradient represents an attractive new method with several advantages over conventional approaches that use toxic organic modifiers or pressure gradients for similar analyses. Next, the use of axial thermal gradients to control the hydration and dehydration of the water stationary phase is explored. Here, the temperature is varied along the length of the column so that the stationary phase can be maintained on a section of the column, while other areas are left uncoated. Therefore, the effective column length can be changed by adjusting the thermal gradient. The length of the column is shown to respond rapidly to changes in the axial thermal gradient and, once a length has been established, retention times are highly reproducible. This approach to tuning column length allows the resolution between analytes and the total analysis time to easily be optimized to meet the needs of different separations. Notably, it is much faster, simpler and more affordable than the conventional method of switching between columns of different lengths. Thus, the control of column length through the partial removal of the water stationary phase presents a more flexible and convenient means of tuning chromatographic separations.en_US
dc.identifier.citationSaowapon, M. T. (2019). Novel Chromatographic Separations Through Dynamically Controlled Stationary Phase Removal (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/36465
dc.identifier.urihttp://hdl.handle.net/1880/110283
dc.language.isoengen_US
dc.publisher.facultyScienceen_US
dc.publisher.institutionUniversity of Calgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.en_US
dc.subjectsupercritical fluiden_US
dc.subjectchromatographyen_US
dc.subjectwateren_US
dc.subjectstationary phaseen_US
dc.subjectcolumn lengthen_US
dc.subjectgradienten_US
dc.subject.classificationChemistry--Analyticalen_US
dc.subject.classificationEngineering--Chemicalen_US
dc.titleNovel Chromatographic Separations Through Dynamically Controlled Stationary Phase Removalen_US
dc.typemaster thesisen_US
thesis.degree.disciplineChemistryen_US
thesis.degree.grantorUniversity of Calgaryen_US
thesis.degree.nameMaster of Science (MSc)en_US
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