|
| |
|
|
Electrochemical Study of Rhamnazin
Ramešová, Šárka ; Sokolová, Romana ; Degano, I.
The natural flavonoid compound rhamanzin (3,5,4’-trihydroxy-7,3’-dimethoxyflavone) is important bioactive compound with antioxidative, anti-allergic, and anti-inflammatory properties. The cyclic voltammetry is used for the electrochemistry behavior of rhamnazin. The determination of oxidation pathways is supported by the identification of degradation products using separation technique.
|
|
|
Adsorption of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine on Au(111) and HOPG
Kocábová, Jana ; Sokolová, Romana
Atomic force microscopy (AFM) was used to study the formation of layers of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) on Au(111) and highly oriented pyrolytic graphite (HOPG) in microscopic level. Both substrates were found to support the DPPC layers. The nanoshaving technique was applied to determine the layer thickness. In addition, the influence of deionized water on the DPPC ordering at the substrates was studied by ex-situ and in-situ AFM intermittent contact mode measurements.
|
|
|
Electrochemical Properties of Branched Pyridinium Cations
Lachmanová, Štěpánka ; Hromadová, Magdaléna ; Pospíšil, Lubomír ; Lainé, P. P.
The electrochemical properties of branched extended pyridinium cations depend strongly on the structure of the molecule. This work is focused on the redox processes of the electron transfer of four derivatives of pyridinium. The electron transfer mechanism was studied by various electrochemical methods. Although the structures of the studied molecules seem to be quite similar, 1-N-methyl-2,4,6-triphenylpyridinium and 1',3',5'-trimethyl-2,4,6-triphenyl-1,4'-bipyridine-1,1'-diium are reduced in two separate one-electron transfer steps. On the other hand, 1'-methyl-2,4,6-triphenyl-1,4'-bipyridine-1,1'-diium and 1',3,5-trimethyl-2,4,6-triphenyl-1,4'-bipyridine-1,1'-diium accept two electrons, but in a single two-electron transfer. The heterogeneous rate constants of the electron-transfer processes were determined.
|
|
| |
|
| |
|
| |
|
| |
|
|
Characterization of Liposomes Used as Model System of Biological Membranes by Glassy Carbon Electrode
Parisová, Martina ; Navrátil, Tomáš ; Šestáková, Ivana ; Barek, J.
This contribution deals with study and characterization of liposomes. These vesicles may serve as model membranes used for study of transporting processes of heavy metal ions across the real phospholipid membranes (PLMs). 1,2-dioleoyl-sn-glycero-3-phosphocholine was used for the formation of large unilamellar vesicles (LUV). These vesicles were prepared by hydration method. Interactions of cadmium ions with LUV in solution have been characterized using voltammetry, where glassy carbon electrode was used as the working electrode. Size and presence of liposomes in sample was proved by dynamic light scattering and free cadmium ions in samples were determined by differential pulse voltammetry.
|
|
|
Short Information on Methanol Outbreak in the Czech Republic in the year 2012
Navrátil, Tomáš ; Zakharov, S. ; Pelclová, D. ; Mrázová, K.
This contribution reports briefly on the large methanol outbreak in the Czech Republic (CR) in autumn 2012. The first case was registered in September 2012 in Havířov. The source was unknown at that time, but it was connected with the illegal production and sale of adulterated spirits. More than 130 cases of methanol intoxication have been reported during September 2012 – April 2013. 44 people died, about 1/5 of intoxicated patients have suffered by sequels of intoxication and their number have been increasing. Moreover, the samples of methanol can be found in some illegal stores and in some households up to now.
|
guest ::
