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Detailed characterization of pyrolysis oil by separation techniques and mass spectrometry
Žvaková, Veronika ; Mravcová, Ludmila (referee) ; Čáslavský, Josef (advisor)
The aim of this work is detailed characterization of pyrolysis oil by advanced analytical separation methods and mass spectrometry. During the pyrolysis process decomposition of complex organic material take place in the presence of high temperatures and the absence of oxygen. Condensable part of vapours and aerosols forms viscous liquid called pyrolysis oil which is a complex mixture of large amount of compounds. In this work samples from microwave pyrolysis of woodchips and sewage sludge from wastewater treatment plant Brno-Modřice were analysed. Samples were provided by Bionic Laboratories company. Samples were separated by column chromatography on activated silica. For detailed characterization of each fraction gas chromatography with mass spectrometry detection and comprehensive two-dimensional gas chromatography with mass spectrometric detection with time of flight analyser were used. Substances that have been identified can be divided into several groups: alkanes, alkenes, aromatic hydrocarbons, polycyclic aromatic hydrocarbons, alcohols, aldehydes, esters, carboxylic acid and heterocycles.
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Stanovení vybraných obsahových látek ve vínech metodou kapalinové chromatografie
Hermanová, Veronika
This thesis deals with the analysis of wines using high-pressure liquid chromatography in order to analyze the content of alcohols, organic acids, and carbohydrates in wine. The most important groups and their representatives are presented in the literary review, as well as the theoretical basis of chromatographic methods, selected types of detectors, and used stationary and mobile phases. In the experimental part, analytical parameters of wines from the retail network, laboratory-prepared must and wines prepared by fermentation were measured using liquid chromatography methods with refractometric and UV detection. The results indicate the suitability of this combination of detectors for the selected wine analyses.
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Estery karotenoidů v potravinách a potravinových doplňcích
MICHALČÍKOVÁ, Anna
Carotenoids are lipophilic dyes; their production is very important for photosynthetic processes as well as for tissue protection in leaves and as attractants in fruits. They are also crucial in human/animal nutrition for their antioxidant effects. Carotenoids can be found in plant and animal tissues both in free and esterified forms. The main goal of this bachelor thesis was to establish the method of saponification of carotenoid extracts from fruits, food supplements and subsequent analysis of the presence of carotenoid esters by HPLC. Saponification was tested with sodium and potassium hydroxides. Content of carotenoid esters was detected in food samples and in selected food supplements with presumed high carotenoid content. Findings are discussed in terms of carotenoid uptake in human digestive tract.
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Targeted analysis of branched-chain faty acid esters by LC/MS
Březinová, Marie ; Kuda, Ondřej (advisor) ; Vrkoslav, Vladimír (referee)
Lipidomics as a part of metabolomics is a fast-growing area of research due to the improvement in analytical techniques. This master thesis is focused on lipid extraction techniques optimization, using liquid liquid extraction and solid phase extraction as pre-separation methods and ultra performance liquid chromatography coupled with mass spectrometry for extraction and subsequent identification of branched-chain fatty acid esters (FAHFA - branched-chain Fatty Acid esters of Hydroxy Fatty Acids). This newly discovered class of lipid molecules is associated with insulin secretion, which could improve whole body and local glucose metabolism, providing potential for diabetes 2 type treatment. Solid phase extraction of biological samples was optimized on columns regarding to sorbent composition using reversed phase columns with modified styrene divinylbenzene polymer or octadecyl-bonded polymer and normal phase columns packed with silica gel. Column Strata SI-1 Silica was the most effective for FAHFA separation from biological samples. Chromatographic separation of FAHFA was performed on UPLC Ultimate 3000 RSLC equipped with Kinetex C18 1,7 µm, 2,1 x 150 mm column using gradient program. UPLC was coupled to QTRAP 5500/SelexION, a hybrid, triple quadrupole, linear ion trap mass spectrometer equipped...
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Detailed characterization of pyrolysis oil by separation techniques and mass spectrometry
Žvaková, Veronika ; Mravcová, Ludmila (referee) ; Čáslavský, Josef (advisor)
The aim of this work is detailed characterization of pyrolysis oil by advanced analytical separation methods and mass spectrometry. During the pyrolysis process decomposition of complex organic material take place in the presence of high temperatures and the absence of oxygen. Condensable part of vapours and aerosols forms viscous liquid called pyrolysis oil which is a complex mixture of large amount of compounds. In this work samples from microwave pyrolysis of woodchips and sewage sludge from wastewater treatment plant Brno-Modřice were analysed. Samples were provided by Bionic Laboratories company. Samples were separated by column chromatography on activated silica. For detailed characterization of each fraction gas chromatography with mass spectrometry detection and comprehensive two-dimensional gas chromatography with mass spectrometric detection with time of flight analyser were used. Substances that have been identified can be divided into several groups: alkanes, alkenes, aromatic hydrocarbons, polycyclic aromatic hydrocarbons, alcohols, aldehydes, esters, carboxylic acid and heterocycles.
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