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Beta-interferon effects the tryptophan metabolism in the plasma of multiple sclerosis patients
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry, Analytical Chemistry.
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Manuscript (Other academic)
URN: urn:nbn:se:uu:diva-91341OAI: oai:DiVA.org:uu-91341DiVA: diva2:164037
Available from: 2004-01-30 Created: 2004-01-30 Last updated: 2011-03-21
In thesis
1. Development of Techniques and Methods for the Quantitative Analysis of Endogenous Substances by Microcolumn Liquid Chromatography Coupled to Mass Spectrometry
Open this publication in new window or tab >>Development of Techniques and Methods for the Quantitative Analysis of Endogenous Substances by Microcolumn Liquid Chromatography Coupled to Mass Spectrometry
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Utveckling av tekniker och metoder för kvantitativ analys av endogena substanser med mikrokolonn vätskekromatografi sammankopplad med masspektrometri
Abstract [en]

Liquid chromatography-mass spectrometry (LC-MS) is a powerful technique for the analysis of endogenous compounds. The introduction of electrospray ionization (ESI) as an interface between LC and MS has contributed strongly to a trend towards miniaturization of LC, due to the possibility to perform ESI at low flow rates. In this thesis, several aspects regarding the design of miniaturized LC systems and electrospray emitters were investigated. In addition miniaturized LC-ESI-MS have been used for the qualitative and quantitative analysis of endogenous polar compounds, peptides and protein digests.

The performance of miniaturized LC-MS was compared using different electrospray emitter configurations. The results indicated that the efficiency of the LC system is rather independent of the configuration of the emitter.

The lifetime of gold-coated fused silica electrospray emitters based on vapor deposited adhesion layers of titanium were investigated. The long lifetime of the emitter facilitates the use in LC-MS experiments, exemplified LC-MS by analysis of neuropeptides.

The ESI voltage is shown to interfere with liquid chromatographic separations performed in packed porous graphitic carbon capillary column. This interference is ascribed to the presence of an electric field over the conductive column in absence of a ground point between the column and the ESI emitter.

The solid supported enhanced microdialysis for analysis of neuropeptides were compared with conventional microdialysis. The difference between the two methodologies were evaluated by LC-MS analysis of the microdialysates. The solid supported method gave in general higher relative recoveries.

Finally, a method of standard addition was developed to determine total level of tryptophan and two of its metabolites in human plasma by capillary LC-ESI tandem mass spectrometry. The method was applied in a clinical study of multiple scleroses patients treated with cytokines (IFN Beta 1a, 1b). The results show that the intervention effects the tryptophan metabolism.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2004. 48 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 936
Analytical chemistry, Analytisk kemi
National Category
Analytical Chemistry
urn:nbn:se:uu:diva-3990 (URN)91-554-5869-6 (ISBN)
Public defence
2004-02-20, B 41, BMC, Husargatan 3 75 237, Uppsala, 10:15
Available from: 2004-01-30 Created: 2004-01-30 Last updated: 2013-06-14Bibliographically approved

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