Národní úložiště šedé literatury Nalezeno 37 záznamů.  začátekpředchozí21 - 30další  přejít na záznam: Hledání trvalo 0.00 vteřin. 
Electrochemistry of Flavonolignans and their Interactions with DNA and Proteins
Pyszková, M. ; Zatloukalová, M. ; Biedermann, David ; Křen, Vladimír ; Ulrichová, J. ; Ramešová, Šárka ; Sokolová, Romana ; Vacek, J.
Electrochemical oxidation of flavonolignans silybin, silydianin, silychristin and their 2,3-dehydroderivatives, was studied using ex situ and in situ cyclic and square wave voltammetry at pyrolytic graphite electrode. The pilot results presented here could be used for further investigation of mechanism of oxidation and reactivity of flavonolignans to DNA and proteins.
Electrochemistry as a Tool for an Enzyme Characterization
Gál, M. ; Krahulec, J. ; Jiríčková, K. ; Sokolová, Romana ; Híveš, J.
Basic biochemical properties such as Michaelis constant (KM) and turnover number (kcat) of enzyme enteropeptidase was measured by electrochemical impedance spectroscopy. Both values determined by impedance measurements are in good agreement with those obtained by traditional spectroscopic techniques. Therefore one can suppose that electrochemical methods might be successful for such measurements also in the case where usual ones (UV-Vis, fluorescence spectroscopy) are not able to determine these enzyme characteristics.
Electrochemistry of Flavonolignans in Acetonitrile and Dimethylsulfoxide
Sokolová, Romana ; Kocábová, Jana ; Fiedler, Jan ; Vacek, J. ; Marhol, Petr ; Vavříková, Eva ; Křen, Vladimír
This study is focused on investigation of oxidation pathways of silybin and 2,3-dehydrosilybin in nonaqueous solutions. The oxidation mechanism of both flavonolignans differs and depends strongly on their chemical structure. The cyclic voltammetry, UV/Vis and IR spectroelectrochemistry were used for identification of electrooxidation (semiquinone) intermediates. HPLC with diode array detection was applied for identification of oxidation and degradation products. Molecular orbital calculations supported the experimental findings.
Oxidation Mechanisms of Diflunisal on Glassy Carbon Electrode
Tiribilli, Ch. ; Giannarelli, S. ; Sokolová, Romana ; Valášek, M.
The electrochemical oxidation of diflunisal in acetonitrile was studied on a glassy carbon electrode. Diflunisal yields one irreversible oxidation wave at 1.6 V (vs. Ag/AgCl/1M LiCl electrode). The oxidation mechanism depends on the basicity of the solvent. The study is based on cyclic voltammetry, electroanalytical methods and UV-Vis spectroelectrochemistry. The degradation products were determined by separation techniques (HPLC-DAD, GC-MS).
Elektrochemická studie rhamnazinu
Ramešová, Šárka ; Sokolová, Romana ; Degano, I.
Rhamnazin (3,5,4’-trihydroxy-7,3’-dimethoxyflavone) patří do skupiny přirozeně se vyskytujících bioflavonoidů. Flavonoidy jsou zpravidla syntetizovány rostlinami a jsou hlavními chromofory ve většině používaných žlutých barviv 1. Flavonoidy byly využívány k barvení tapiserií a dalších historických předmětů již v 16. století 2. Rhamnazin je široce rozšířený v přírodě, především v ovoci, zelenině a čajích 3,4. Tato sloučenina je známá pro své terapeutické účinky, užívá se jako preventivní léčivo při kardiovaskulárních onemocněních, rakovině a hepatitidě 5,6.
Adsorpce 1,2-dipalmitoyl-sn-glycero-3-fosfocholin na Au(111) a HOPG
Kocábová, Jana ; Sokolová, Romana
Molekula 1,2-dipalmitoyl-sn-glycero-3-fosfocholin (DPPC) (Obr. 1.) 1 patří mezi fosfolipidy (zwitterion fosfoglycerid), které jsou používané pro přípravu liposomálních monovrstev. V literatuře se stále setkáváme se snahou vytvořit modelové membrány buněk, tak abychom byli schopni pochopit jejich mechanismus a kinetiku vzniku a následně je mohli využit v biotechnologických aplikacích 2,3.
Adsorpce fosfolipidů na mezifází
Sokolová, Romana ; Kocábová, Jana ; Parisová, Martina ; Navrátil, Tomáš ; Gál, Miroslav
V předkládaném příspěvku je diskutován vliv typu substrátu na tvorbu fosfolipidové vrstvy, ať už fosfolipidové dvojvrstvy nanesené na povrchu (supported phospholipids bilayer, SPB) nebo vrstvy vesikul fosfolipidu nanesené na povrchu (supported vesicular layer, SVL). Studium je zaměřeno hlavně na vlastnosti fosfolipidové vrstvy nanesené na polykarbonátovou membránu.
Spectroelectrochemistry of Flavonolignans and their DNA-binding Copper Complexes
Sokolová, Romana ; Kubala, M. ; Vavříková, E. ; Ulrichová, J. ; Křen, Vladimír ; Vacek, J.
The oxidation of flavonolagnan silybin and its selected derivatives was studied on glassy carbon electrode in aqueous environment by means of cyclic voltammetry, in situ UV/VIS spectroelectrochemistry and absorption spectrometry. The oxidation mechanism of flavonolignans and their complexion with copper was investigated under anaerobic conditions. The acquired results were interpreted in context of protective (antioxidant) and DNA-binding (prooxidant) properties of flavonolignans and their transition metal complexes.
Electrochemistry of Potential Eu MRI Complexes
Gál, Miroslav ; Sokolová, Romana ; Kielar, P.
Properties of the several potential contrast agents for magnetic resonance imaging (MRI) with Eu(III)/Eu(II) redox couple were investigated by means of the electrochemical methods. Cyclic voltammetry, phase sensitive AC voltammetry, and DC polarography were utilized to elucidate the mechanism of the reduction/oxidation of Eu ion in the presence of these compounds. Moreover, the stability constants of the Eu(II)-MRI agent complexes were also determined. Some suggestions on the chemical structure of the potential contrast agents for MRI are also made.
Properties of some radiosensitizers studied by means of the electrochemical methods
Gál, Miroslav ; Kolivoška, Viliam ; Ambrová, M. ; Híveš, J. ; Sokolová, Romana ; Hromadová, Magdaléna
To determine the correlation between reduction potential and some physicochemical properties of selected radiosensitizers cyclic voltammetry and theoretical calculations based on the DFT method with B3LYP functional of the level of 6-311++G** basis set in vacuum were utilized. Very good correlation was found between electron affinities of radiosensitizers and their reduction potential and so called E1(7) potential.

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