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UV-Vis and IR Spectroelectrocbemistry of Copper Complexes and Bioactive Compounds
Sokolová, Romana ; Obluková, Michaela ; Sýs, M. ; Mikysek, T. ; Wantulok, J. ; Nycz, J. E. ; Degano, I.
The interpretation of the change of absorption spectrum of an oxidized and reduced molecule\nrecorded during the electron transfer is an efficient tool for the determination of oxidation or\nreduction mechanism. This technique provides the information about the electroactive\nchromophore and is performed in two regimes of electrochemical measurement, cyclic\nvoltammetry and chronoamperometry, respectively. This approach was successfully applied to\nstudy the fundamental electrochemical behavior of recently synthesized copper complexes\nproviding biomimetic activity, ofpolyphenolic bioactive compounds, and also for the reduction\nof halogenated phenanthrolines. The identification of redox products was done by\nchromatographic techniques as HPLC-DAD and HPLC-ESI-MS/MS.
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Structure and reactivity of anions of aromatic hydrocarbons
Obluková, Michaela ; Čabala, Radomír (advisor) ; Jašík, Juraj (referee)
This bachelor thesis deals with research about negative ions reactivity of aromatic hydrocarbons which occur in Titan's ionosphere - Saturn's moon. As an experimental method there was used tandem mass spectrometry with electrospray ionization technique, quadrupole mass analyzer and collision cell. The aim of this thesis was to contribute to the general understanding of processes in the Titan's ionosphere. Particularly there were performed experimental studies to created isomeric benzyne radical anions (o-, m-, p- C6H4˙- ) which were generated from phthalic, isophthalic and terephthalic acid and subsequently their reactions were explored with selected neutral gases in collision cell (C2H2, HC3N, CH3CN, SO2, O2).
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Study of new synthetic drugs using LC/MS/MS
Obluková, Michaela ; Žabka, Ján (advisor) ; Cvačka, Josef (referee)
In the recent years, many new substances have appeared in the drug market, which are abused for their psychoactive effect. It is used as an alternative to classical drugs (heroin, cocaine, ecstasy ect.) due to their legal status. The great concern is ineffectiveness of the current methods of toxicological screening of biological samples to identify these new compounds. The aim of my diploma thesis was to receive or expand knowledge of chemical properties of 10 standards of new psychoactive substances and its metabolites using MS/MS. Conditions for creation of precursor ions in ion source, optimization of conditions of transport of these ions to the ion trap and optimization of condition of fragments creation in the ion trap were optimized. Subsequently, fragmentation of these ions was studied systematically. Characteristic losses of neutral molecules were determined for each group of these substances which can increase the sensitivity of this method. After that, mephedrone was chosen for detailed study including the study of its metabolites using LC-MS/MS. Standard of mephedrone, spiked urine sample with mephedrone and rat urine dosed with mephedrone were studied. Mephedrone and some its metabolites were identificated in this urine sample. Information received from the investigated substances can...
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Study of Metabolism of Synthetic Cannabinoids. Electrochemical Properties of JWH-018
Obluková, Michaela ; Sokolová, Romana ; Čabala, R.
In the recent years, many new substances have appeared in the drug market, which are abused for their psychoactive effect. They serve as alternative to classical drugs (heroin, cocaine, ecstasy) due to their legal status. The great concern is the ineffectiveness of the current methods of toxicological screening of biological samples to identify these new compounds. It is essential to know the metabolism pathway of these psychoactive substances for a development of a new efficient method for their detection. This report is devoted to understanding of oxidation and reduction mechanism of JWH-018 and JWH-250 by means of cyclic voltammetry and to identification of their redox products.
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Study of new synthetic drugs using LC/MS/MS
Obluková, Michaela ; Žabka, Ján (advisor) ; Cvačka, Josef (referee)
In the recent years, many new substances have appeared in the drug market, which are abused for their psychoactive effect. It is used as an alternative to classical drugs (heroin, cocaine, ecstasy ect.) due to their legal status. The great concern is ineffectiveness of the current methods of toxicological screening of biological samples to identify these new compounds. The aim of my diploma thesis was to receive or expand knowledge of chemical properties of 10 standards of new psychoactive substances and its metabolites using MS/MS. Conditions for creation of precursor ions in ion source, optimization of conditions of transport of these ions to the ion trap and optimization of condition of fragments creation in the ion trap were optimized. Subsequently, fragmentation of these ions was studied systematically. Characteristic losses of neutral molecules were determined for each group of these substances which can increase the sensitivity of this method. After that, mephedrone was chosen for detailed study including the study of its metabolites using LC-MS/MS. Standard of mephedrone, spiked urine sample with mephedrone and rat urine dosed with mephedrone were studied. Mephedrone and some its metabolites were identificated in this urine sample. Information received from the investigated substances can...
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Structure and reactivity of anions of aromatic hydrocarbons
Obluková, Michaela ; Čabala, Radomír (advisor) ; Jašík, Juraj (referee)
This bachelor thesis deals with research about negative ions reactivity of aromatic hydrocarbons which occur in Titan's ionosphere - Saturn's moon. As an experimental method there was used tandem mass spectrometry with electrospray ionization technique, quadrupole mass analyzer and collision cell. The aim of this thesis was to contribute to the general understanding of processes in the Titan's ionosphere. Particularly there were performed experimental studies to created isomeric benzyne radical anions (o-, m-, p- C6H4˙- ) which were generated from phthalic, isophthalic and terephthalic acid and subsequently their reactions were explored with selected neutral gases in collision cell (C2H2, HC3N, CH3CN, SO2, O2).
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