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Use of Monovalent Copper for Sensitive Detection of Methyl Derivatives of Xanthine
Navrátil, R. ; Motlova, D. ; Jelen, F. ; Trnková, L.
This work is concerned with the electroanalysis of xanthine (Xan) and its methylated derivatives (1-, 3-, 7-, and 9-mXan) on a pencil graphite electrode in the presence of copper ions. The main idea of using copper consists in the in situ formation of the complex Cu(I)-mXan on the electrode surface and improvement of oxidative signals of the corresponding mXan during the detection. Linear sweep voltammetry (LSV) in connection with adsorption stripping techniques was used for the determination of mXan. To enhance the oxidation signals the elimination voltammetric procedure (EVP) was applied.
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A Preliminary Study of Modification of 7-Deazaadenine with a Complex of Osmium Tetroxide with 2,2 '-Bipyridine
Vítová, Lada ; Havran, Luděk ; Fojta, Miroslav ; Šedo, O. ; Zdráhal, Z. ; Vespalec, Radim
Reactivity of a purine nucleic base analogue 7-deazaadenine (A*) in short oligodeoxynucleotide (ODN) towards an osmium tetroxide complex with 2,2'-bipyridine (Os, bipy) was investigated by means of electrochemistry, capillary electrophoresis and MALDI-TOF mass spectrometry. Electrochemical measurement, electrophoretic analyses and mass spectrometric analyses of reaction mixture proved that ODN with an A* residue yields an osmium adduct with properties similar to those exhibited by the well-known adduct of thymine.
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Application of Cyclopentenediones for Preparation of Permselective Layers.
Vacek, J. ; Hrbáč, J. ; Matějka, P. ; Storch, Jan
In this contribution, we report that electrooxidation of PCD, phenolic cyclopentenedione, 2,2'-bis[4,5-bis(4-hydroxybenzyl)-2-(4-hydroxyphenyl)-cyclopent-4-ene-1,3-dione] results in the formation of stable films with permselective properties on metal and carbon surfaces. The electropolymerization process proceeds in neutral and alkaline aqueous medium at potentials higher than +0.6 V (vs. Ag/AgCl/3M KCl). The PCD polymer prepared was characterized by electrochemical methods, quartz crystal microbalance and optical spectroscopy techniques. The PCD film can be used for electrode coating and preparation of an anti-interference barrier. Thus, we performed SAR study which could open the door to developing novel functional films and electrochemical tools for bioactive compounds sensing.\n
Plný tet: MEM20140001 -  PDF
Plný text: content.csg - PDF
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Searching for Electrochemical Reduction Mechanism of Azidophenyl DNA Labels
Daňhel, Aleš ; Trošanová, Zuzana ; Balintová, Jana ; Hocek, Michal ; Fojta, Miroslav
This contribution brings new information to sporadic scientific results concerned to electrochemical reduction of aromatic azides. Selected compounds used as perspective DNA labels or their structural constituents such as, 4-azidophenyltrifluoroboronic acid, 4-azidophenyl modified deoxycytidine and next probable analogous compounds and/or products of their reduction, were voltammetrically studied and compared to each other in order to reveal a mechanism of their electrochemical reduction at mercury electrodes in aqueous media. Preliminary results obtained by cyclic voltammetry at mercury and carbon based electrodes and by mass spectrometry of the products isolated from batch electrolysis on mercury pool by preparative chromatography are discussed.
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Voltametrická analýza nukleosidtrifosfátů a oligonukleotidů značených antrochinonem na zlatých elektrodách
Vidláková, Pavlína ; Balintová, Jana ; Havran, Luděk ; Hocek, Michal ; Fojta, Miroslav
Elektrochemická aktivita nukleových kyselin byla objevena v 50. letech 20. století a od té doby je používána ke studiu struktury a interakcí přirozených i modifikovaných molekul nukleových kyselin i syntetických oligonukleotidů. Přestože je přirozená DNA sama o sobě elektrochemicky aktivní a je možné ji studovat na různých typech elektrod, je pro řadu analytických aplikací praktické použít DNA značenou elektroaktivními molekulami (například komplexy přechodných kovů, amino- nebo nitroskupinami, antrachinonem apod.). Tyto látky podléhají redoxním reakcím a dávají takto modifikované DNA nové elektrochemické vlastnosti, které je možné využít pro studium struktury a interakcí nukleových kyselin a v oblasti DNA diagnostiky.
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Voltammetric Behavior of 4-Aminophthalimide Label using Hanging Mercury Drop Electrode
Ferenčíková, Z. ; Daňhel, Aleš ; Riedl, Jan ; Hocek, Michal ; Fojta, Miroslav
4-aminophthalimide (API), covalently attached to nucleotide (dCTP or dATP) has recently beendesigned as a fluorescent label for the detection of DNA-protein interaction. However API is electrochemically reducible and therefore it is possible to use alternatively the API-modified nuclotides as DNA redox labels. The electrochemical behavior of labeled nucleotides and labeled DNA was studied using cyclic voltammetry and transfer stripping cyclic voltammetry at hanging mercury drop electrode. Observed CVs showed irreversible reduction signals of 4-aminophthalimide label without production of consequently oxidizable/reducible species.
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