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Development and applications of ambient mass spectrometry techniques
Rejšek, Jan ; Cvačka, Josef (advisor) ; Lemr, Karel (referee) ; Klejdus, Bořivoj (referee)
(EN) Ambient mass spectrometry defines the versatile group of methods providing analysis of solid sample surfaces and liquids in an open atmospheric pressure environment, where the sample is simultaneously accessible to another treatment. Ambient mass spectrometry is a sharply developing research area in the analytical chemistry. It provides fast, direct analysis of objects without any sample pretreatment with the use of the mass spectrometer. Desorption electrospray ionization (DESI) and desorption atmospheric pressure photoionization (DAPPI) equipped with software control of the sample holder were investigated in this doctoral thesis. These methods use a spray of solvents for desorption and ionization molecules from solid substrate and they are suitable tools for mass spectrometry imaging (MSI) of low molecular organic compounds, where the chemical identity of molecules present on a surface is examined as a function of spatial distribution. This project deals with applications and instrumental development. As for the applications, the position of the defense glands on insect bodies, separation of the lipids in complex mixtures on thin-layer chromatography (TLC) plates, or steroid metabolites in woman urine during pregnancy were thus investigated. As for the instrumental development, the most...
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Versatile use of liquid chromatography and mass spectrometry in drug metabolism studies
Suchanová, Bohumila ; Wsól, Vladimír (advisor) ; Solich, Petr (referee) ; Lemr, Karel (referee)
Human organism has always been exposed to a vast array of chemicals encountered in the environment. Chemical revolution has significantly influenced biological evolution of humans leading to serious unpredictable toxicities. In response to continual chemical stress they have developed a variety of enzymes to transform these xenobiotics. Xenobiotics are mostly highly lipophilic and cannot readily be excreted from the body without metabolism to more hydrophilic, water-soluble metabolites. Not only environmental chemicals represent xenobiotics but also drugs, dietary components etc. Biotransformation studies play an important role in the drug discovery and development process. Usually data from drug metabolism is required before a new substance can advance towards the development stages of a new therapeutic agent. Data on metabolism is frequently used to optimize drug candidates, suggest more active compounds or support toxicology studies. The increased flux of new chemical entities into drug discovery has placed an increased need for fast and reliable information on the metabolism of these substances. Liquid chromatography coupled with mass spectrometry can meet demands for rapid drugs and metabolites analysis imposed by modern drug discovery strategies. This dissertation thesis presents an evidence...
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Development and applications of ambient mass spectrometry techniques
Rejšek, Jan ; Cvačka, Josef (advisor) ; Lemr, Karel (referee) ; Klejdus, Bořivoj (referee)
(EN) Ambient mass spectrometry defines the versatile group of methods providing analysis of solid sample surfaces and liquids in an open atmospheric pressure environment, where the sample is simultaneously accessible to another treatment. Ambient mass spectrometry is a sharply developing research area in the analytical chemistry. It provides fast, direct analysis of objects without any sample pretreatment with the use of the mass spectrometer. Desorption electrospray ionization (DESI) and desorption atmospheric pressure photoionization (DAPPI) equipped with software control of the sample holder were investigated in this doctoral thesis. These methods use a spray of solvents for desorption and ionization molecules from solid substrate and they are suitable tools for mass spectrometry imaging (MSI) of low molecular organic compounds, where the chemical identity of molecules present on a surface is examined as a function of spatial distribution. This project deals with applications and instrumental development. As for the applications, the position of the defense glands on insect bodies, separation of the lipids in complex mixtures on thin-layer chromatography (TLC) plates, or steroid metabolites in woman urine during pregnancy were thus investigated. As for the instrumental development, the most...
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Versatile use of liquid chromatography and mass spectrometry in drug metabolism studies
Suchanová, Bohumila ; Wsól, Vladimír (advisor) ; Solich, Petr (referee) ; Lemr, Karel (referee)
Human organism has always been exposed to a vast array of chemicals encountered in the environment. Chemical revolution has significantly influenced biological evolution of humans leading to serious unpredictable toxicities. In response to continual chemical stress they have developed a variety of enzymes to transform these xenobiotics. Xenobiotics are mostly highly lipophilic and cannot readily be excreted from the body without metabolism to more hydrophilic, water-soluble metabolites. Not only environmental chemicals represent xenobiotics but also drugs, dietary components etc. Biotransformation studies play an important role in the drug discovery and development process. Usually data from drug metabolism is required before a new substance can advance towards the development stages of a new therapeutic agent. Data on metabolism is frequently used to optimize drug candidates, suggest more active compounds or support toxicology studies. The increased flux of new chemical entities into drug discovery has placed an increased need for fast and reliable information on the metabolism of these substances. Liquid chromatography coupled with mass spectrometry can meet demands for rapid drugs and metabolites analysis imposed by modern drug discovery strategies. This dissertation thesis presents an evidence...
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