Number of found documents: 298
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Voltammetric Detection of Purine Nucleobases on Screen-Printed Graphite Electrodes Modified by Nanocarbon Materials
Hasoň, Stanislav; Ostatná, Veronika; Fojta, Miroslav
2018 - English
Recent studies have shown that the electrochemical oxidation of purine nucleobases (adenine and geaoine) at graphite electrodes is strongly dependent on the orientation of graphene sheets. their size and mutual distribution on the electrode surface. Edges and defects of graphene sheets affect the kinetics of oxidation processes, basal planes support the adsorption processes The aim of this study is to determine how model carbon nanomaterials including graphene, single-walled or multi-wailed carbon nanotubes. carbon nanofibres and mesoporous graphene affect the electrochemical oxidation or purine nuclebases on screen-printed carbon electrodes modified by these nanostructures in solution without and in the presence of copper. Keywords: Differential Pulse Voltammetry; Purine Nucleobases; Screen-Printed Carbon Electrodes; Carbon Nanomaterials Available at various institutes of the ASCR
Voltammetric Detection of Purine Nucleobases on Screen-Printed Graphite Electrodes Modified by Nanocarbon Materials

Recent studies have shown that the electrochemical oxidation of purine nucleobases (adenine and geaoine) at graphite electrodes is strongly dependent on the orientation of graphene sheets. their size ...

Hasoň, Stanislav; Ostatná, Veronika; Fojta, Miroslav
Biofyzikální ústav, 2018

Electrochemical Investigation of Different Boron Cluster Compounds in Water-based Electrolytes
Fojt, Lukáš; Vespalec, Radim; Fojta, Miroslav; Grüner, Bohumír
2018 - English
Boron cluster compounds (BCC) belongs to one or the proud sing compounds which ace used for medical treatment Their use for biochemical purposes is connected with use of water-based environments. Up to now, the BCC were predominantly characterized in non-aqueous milieus Therefore, we decided to undertake electrochemical research of BCC in water-based electrolytes. We have investigated several boron clusters with structures containing different number of vertexes (from 3 to 18), The structures were modified by endo- and exo- skeletal substituents. All used BCC were electrochemically active in broad potential region. which implies their possible use as biomarkers with tunable electrochemical response. Keywords: boron cluster compounds; glassy carbon electrode; dpv; carboranes Available at various institutes of the ASCR
Electrochemical Investigation of Different Boron Cluster Compounds in Water-based Electrolytes

Boron cluster compounds (BCC) belongs to one or the proud sing compounds which ace used for medical treatment Their use for biochemical purposes is connected with use of water-based environments. Up ...

Fojt, Lukáš; Vespalec, Radim; Fojta, Miroslav; Grüner, Bohumír
Biofyzikální ústav, 2018

Preparation and Characterization of Silver Amalgam Particles on Gold Electrode Surface
Havranová-Vidláková, Pavlína; Šebest, Peter; Ligmajer, Filip; Fojta, Miroslav; Daňhel, Aleš
2018 - English
This work is focused on the preparation of silver amalgam particles by its direct electrodeposition on gold surfaces using double pulse chronoamperometry from solution containing soluble Ag+ and Hg2+ ionts. During the electrodepositions of silver amalgam particles, different: i) parameters of chronoamperometry, ii) Ag/Hg ratio in solution and iii) gold electrodes were studied. All the prepared amalgam particles were characterized by scanning electron microscope with energy dispersive X-ray spectroscopy and electrochemical methods. Voltammetric application of the gold electrodes decorated by sliver amalgam particles was confirmed by analysis of model organic nitrocompound using cyclic voltammetry. Keywords: Silver amalgam; Gold electrode; 4-nithrophenol; Amperometry Available at various institutes of the ASCR
Preparation and Characterization of Silver Amalgam Particles on Gold Electrode Surface

This work is focused on the preparation of silver amalgam particles by its direct electrodeposition on gold surfaces using double pulse chronoamperometry from solution containing soluble Ag+ and Hg2+ ...

Havranová-Vidláková, Pavlína; Šebest, Peter; Ligmajer, Filip; Fojta, Miroslav; Daňhel, Aleš
Biofyzikální ústav, 2018

Analysis of Products of Nontemplate Enzymatic Synthesis of DNA Oligonucleotides using Voltammetric Methods
Hermanová, Monika; Havranová-Vidláková, Pavlína; Ondrackova, Anna; Fojta, Miroslav
2018 - English
Nontemplate DNA synthesis is a feature specific for a special type of DNA polymerase, terminal deoxynucleotidyl transferase (TdT). This enzyme is able. to randomly add nucleotides to a sintde-stranded DNA primer, provided the 3'OH end of the primer is accessible, Here we show that voltammetric analysis based on hanging mercury drop electrode (EPODE) and pyrolytic graphite electrode (PGE) enables to study this nontemplate DNA synthesis. Keywords: Nontemplete DNA synthesis; Hanging mercury drop electrode; Pyrolytic graphite electrode Available at various institutes of the ASCR
Analysis of Products of Nontemplate Enzymatic Synthesis of DNA Oligonucleotides using Voltammetric Methods

Nontemplate DNA synthesis is a feature specific for a special type of DNA polymerase, terminal deoxynucleotidyl transferase (TdT). This enzyme is able. to randomly add nucleotides to a sintde-stranded ...

Hermanová, Monika; Havranová-Vidláková, Pavlína; Ondrackova, Anna; Fojta, Miroslav
Biofyzikální ústav, 2018

Electrochemical Deposition of Silver Amalgam Particles on Pyrolitic Graphite Electrode
Šebest, Peter; Havranová-Vidláková, Pavlína; Ligmajer, Filip; Fojta, Miroslav; Daňhel, Aleš
2018 - English
Silver solid amalgam represents suitable alternative electrode material to metallic mercury, Controlled electrodeposition of variable silver amalgam particles (AgAP) on the surface of pyrolitic graphite electrode from an electrolyte containing Agt It and Hg(II) ions is reported as a novel method suitable lot preparation of perspective supporting materials Scanning electron microscopy including energy-disperse X-ray spectrometer and image processing software were used for analysis of composition and morphology of AgAP on POE A model electrochemically reducible 4-niirophenol was used to test a potential applicability of AgAp-PGE in electroanalytical methods. Keywords: Silver Amalgam; Electrodeposition; Scanning Electron Microscopy; Voltammetry Available at various institutes of the ASCR
Electrochemical Deposition of Silver Amalgam Particles on Pyrolitic Graphite Electrode

Silver solid amalgam represents suitable alternative electrode material to metallic mercury, Controlled electrodeposition of variable silver amalgam particles (AgAP) on the surface of pyrolitic ...

Šebest, Peter; Havranová-Vidláková, Pavlína; Ligmajer, Filip; Fojta, Miroslav; Daňhel, Aleš
Biofyzikální ústav, 2018

Electrochemical Study of Osmium Tetroxide Comptests Reactivity to DNA Bearing Butylacrylate
Havran, Luděk; Havranová-Vidláková, Pavlína; Špaček, Jan; Vítová, Lada; Hermanová, Monika; Fojta, Miroslav
2018 - English
Coniplexes of osmium tetroside with nitrogen ligands (Os,L e.g.. with 2,2'-bipyridine (bpy) find application in redox labelling of DNA.. probing of DNA structure, and in studies of DNA interaction with other molecules Os,L preferentially react with pyrimidines in single strand DNA producing electroactive adducts Primary reaction site for Os,L is C=C double bond in pyrimidine nucleobases. In this contribution we introduce a new two-step technique of DNA modification with Os,bpy, consisting in enzymatic construdion or DNA beating butyl acrylate (BA) moieties attached to uracil or T-deaza adenine, followed by chemical modification of a reactive C=C double bond in BA residue. Keywords: Osmium tetroxide complexes; Chemically modified DNA; Voltammetry; Butyl acrylate Available at various institutes of the ASCR
Electrochemical Study of Osmium Tetroxide Comptests Reactivity to DNA Bearing Butylacrylate

Coniplexes of osmium tetroside with nitrogen ligands (Os,L e.g.. with 2,2'-bipyridine (bpy) find application in redox labelling of DNA.. probing of DNA structure, and in studies of DNA interaction ...

Havran, Luděk; Havranová-Vidláková, Pavlína; Špaček, Jan; Vítová, Lada; Hermanová, Monika; Fojta, Miroslav
Biofyzikální ústav, 2018

Study of Synthetic Oligonacleotides Containing Guanine by Voltammetry on a Graphite Electrode
Hejduková, M.; Špaček, Jan; Fojta, Miroslav; Havran, L.; Renciuk, D.
2018 - English
Electrochemical oxidation of specifically designed DNA hexamers containing guanine has been studied in aqueous acetate buffet (pH 5) at a pyrolytic graphite electrode (PGE) by linear sweep voltammetry (LSV) Influence of the oligonucleotide composition and concentration was investigated It seems that short oligonucleotides containing guanine produce oxidation signals. which are sensitive to their structural properties Simple electrochemical techniques us may be useful tool for monitoring of structural changes of DNA. Keywords: Oligonucleotides; Pyrolytic graphite electrode; Linear sweep voltammetry Available at various institutes of the ASCR
Study of Synthetic Oligonacleotides Containing Guanine by Voltammetry on a Graphite Electrode

Electrochemical oxidation of specifically designed DNA hexamers containing guanine has been studied in aqueous acetate buffet (pH 5) at a pyrolytic graphite electrode (PGE) by linear sweep voltammetry ...

Hejduková, M.; Špaček, Jan; Fojta, Miroslav; Havran, L.; Renciuk, D.
Biofyzikální ústav, 2018

Reduction of the DNA at a Pyrolytic Graphite Electrode:Opening of the Second Half of the Potential Window
Špaček, Jan; Daňhel, Aleš; Hasoň, Stanislav; Hejduková, M.; Fojta, Miroslav
2018 - English
The pyrolytic graphite electrode (PGE) can be used at highly negative potentials, providing reduction signals known from mercury-based electrodes. Use of the negative part of the potential window more than doubled the number of analytically useful signals provided by unlabelled DNA on PGE. It enables selective analysis of all canonical DNA bases,5-methylcytosine and uracil It also allows for distinction of overlapping signals cathodic polarization can selectively ´switch off´ DNA anodic signals and rice versa. Newly observed signals corresponding to oxidation of reduced bases and reduction of oxidized bases are also described. Keywords: 5-Methyleylosine; dna; Electrochemistry; Electrochemical oxidation Available at various institutes of the ASCR
Reduction of the DNA at a Pyrolytic Graphite Electrode:Opening of the Second Half of the Potential Window

The pyrolytic graphite electrode (PGE) can be used at highly negative potentials, providing reduction signals known from mercury-based electrodes. Use of the negative part of the potential window more ...

Špaček, Jan; Daňhel, Aleš; Hasoň, Stanislav; Hejduková, M.; Fojta, Miroslav
Biofyzikální ústav, 2018

Voltammetric Techniques for Analysis in a Single Drop of a Solution
Gajdar, J.; Goněc, T.; Jampílek, J.; Brázdová, Marie; Bábková, Zuzana; Fojta, Miroslav; Barek, J.; Fischer, J.
2017 - English
This contribution describes miniaturization of voltammetric methods and some of the main problems caused by reducing the sample volume to 20 mu L. This study was carried out in dimethyl sulfoxide solutions and buffered aqueous solutions with 10% DMSO at a glassy carbon electrode. A novel antibiotic agent, 1-hydroxy-N-(4-nitrophenyl) naphthalene-2-carboxamide, was used as a model substance. This analyte was determined by cathodic and anodic voltammetry. Elimination of the negative influence of dissolved oxygen was performed in various manners. Two most effective methods were square wave voltammetry that can be used in the presence of dissolved oxygen and removal of oxygen in a microcell with nitrogen atmosphere inside. Keywords: herbicidal activity; antibacterial; electrodes; system Available at various institutes of the ASCR
Voltammetric Techniques for Analysis in a Single Drop of a Solution

This contribution describes miniaturization of voltammetric methods and some of the main problems caused by reducing the sample volume to 20 mu L. This study was carried out in dimethyl sulfoxide ...

Gajdar, J.; Goněc, T.; Jampílek, J.; Brázdová, Marie; Bábková, Zuzana; Fojta, Miroslav; Barek, J.; Fischer, J.
Biofyzikální ústav, 2017

Utilization of Catalytic Hydrogen Evolution in Electrochemical Analysis of Nucleic Acids
Fojta, Miroslav; Daňhel, Aleš; Špaček, Jan; Havran, Luděk; Šebest, Peter; Orság, Petr; Pivoňková, Hana; Vosáhlová, J.; Schwarzová-Pecková, K.
2017 - English
Catalysis of hydrogen evolution (CHE) at mercury in the presence of proteins was discoverd shortly after the introduction of polarography. In contrast, unmodified nucleic acids have not been reported to produce distinct signals due to the CHE to date. Chemically modified nucleic acids bearing certain extrinsic groups produce analytically useful signals due to hydrogen evloution catalyzed by the respective modifications. These species include (a) transition metal complexes, and (b) non-metal catalytically active organic moieties. In addition, the CHE has been reported to be invoved in guanine reduction process at the mercury-based electrodes. Keywords: Catalytic hydrogen evolution; Mercury; Amalgam Available at various institutes of the ASCR
Utilization of Catalytic Hydrogen Evolution in Electrochemical Analysis of Nucleic Acids

Catalysis of hydrogen evolution (CHE) at mercury in the presence of proteins was discoverd shortly after the introduction of polarography. In contrast, unmodified nucleic acids have not been reported ...

Fojta, Miroslav; Daňhel, Aleš; Špaček, Jan; Havran, Luděk; Šebest, Peter; Orság, Petr; Pivoňková, Hana; Vosáhlová, J.; Schwarzová-Pecková, K.
Biofyzikální ústav, 2017

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