Search for dissertations about: "analytisk"

Showing result 16 - 20 of 688 swedish dissertations containing the word analytisk.

2. 16. Development of Enhanced Analytical Methodology in Pesticide Chemistry

   Author : Tuija Pihlström; Karin E Markides; Bengt-Göran Österdahl; Amadeo Rodríguez Fernández-Alba; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Analytical chemistry; Analytisk kemi; Analytical chemistry; Analytisk kemi; Analytical Chemistry; analytisk kemi;

   Abstract : The analysis of pesticide residues in fruit, vegetables, rape seed and water has been improved using developments in sample handling and analytical techniques. The method development is associated with analytical difficulties, since pesticides currently used in agriculture represent a variety of chemical classes having very different physico chemical properties. READ MORE

4. 17. Novel clean-up, concentration and laser desorption/ionization strategies for mass spectrometry

   Author : Mohammadreza Shariatgorji; Leopold Ilag; Juan Astorga-wells; Bernhard Spengler; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Mass spectrometry; ESI-MS; SALDI-MS; Electrocapture; Sample treatment; Analytical chemistry; Analytisk kemi; Analytical Chemistry; analytisk kemi;

   Abstract : Despite valuable advantages of mass spectrometry (MS) techniques they still have drawbacks that need to be overcome, notably their sensitivity to various kinds of interfering substances and associated difficulties involved in detecting signals from analytes present in trace quantities. Thus, high quality analytical data could be acquired by improving sample pre-treatment techniques and/or ionization methods to increase ionization yields and/or avoid the generation of unwanted ions. READ MORE

5. 18. Mass Spectrometry of Biologically Active Small Molecules : Focusing on polyphenols, alkaloids and amino acids

   Author : Zdeněk Spáčil; Leopold L. Ilag; Frantisek Turecek; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; LC-MS; LDI; Mass spectrometry; HPLC; UHPLC; polyphenols; phenolic acids; BMAA; Separation methods; Separationsmetoder; Analytical chemistry; Analytisk kemi; Analytical Chemistry; analytisk kemi;

   Abstract : The foci of this dissertation are on advanced liquid chromatography (LC) separation and mass spectrometry (MS) techniques for the analysis of small bioactive molecules. In addition to discussing general aspects of such techniques the results from analyses of polyphenols (PPs), alkaloids and amino acids published in five appended studies are presented and discussed. READ MORE

6. 19. Colloidal/Solid Phase Extraction (C/S PE) Methods Based on Hydrogel Nanoparticles, Titanium dioxide microparticles and Empore Membranes Applied to Biological and Environmental Matrices

   Author : Davide Tamburro; Leopold Ilag; Robin Couch; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; biomarkers; nanogels; solid-phase extraction; organophosphate esters; peptides; mass spectrometry; Analytical chemistry; Analytisk kemi; Analytical Chemistry; analytisk kemi;

   Abstract : The aim of the work described in this thesis was to create and develop novel technologies in order to overcome barriers and hurdles that analytical chemistry faces focusing on sample extraction. In paper I dye containing amine groups (e.g. READ MORE

7. 20. Retention time predictions in Gas Chromatography

   Author : Yasar Thewalim; Anders Colmsjö; Torgny Fornstedt; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; gas chromatography; computer simulation; two-parameter model; retention time prediction; Analytical chemistry; Analytisk kemi; Analytical Chemistry; analytisk kemi;

   Abstract : In gas chromatography, analytes are separated by differences in their partition between a mobile phase and a stationary phase. Temperature-program, column dimensions, stationary and mobile phases, and flow rate are all parameters that can affect the quality of the separation in gas chromatography. READ MORE