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Participation of electrochemistry in the studies of human metabolism
Navrátil, Tomáš ; Šenholdová, Z. ; Přistoupilová, K. ; Přistoupil, T. I. ; Heyrovský, Michael ; Pelclová, D. ; Žák, J.
The contribution deals with explanation of metabolism of long term supplemented creatine in human organism. This process differs from metabolism of natural endogenous creatine, which is excreted in form of creatinine. Exogenous creatine induces increase of peptide formation, of body mass, and of intracellular fluid.
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The use of prototype of multichannel device for electrochemical detection of DNA hybridization
Brázdilová, P. ; Navrátil, Tomáš ; Josypčuk, Bohdan ; Fojta, Miroslav
The article presents newly constructed 8-channel device, which enables sequential analysis realized on up to 8 different or equal sensors. The device is computer controlled. The screen-printed carbon electrodes (SPCE) were connected to the device. DNA hybridization was detected. DNA present in the sample spontaneously adsorbed on the surface of SPCE and free surface was subsequently blocked using beef serum albumin. The adsorbed DNA was then hybridized with the probe marked with biotin and streptavidin conjugated with enzyme alkaline phosphatase (SALP). This enzyme catalyzes the transformation of electrochemically inactive 1-naphtylphosphateone 1-naphtol, which anodic signal was detected DC voltammetry (DCV).
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Composite solid amalgam electrodes
Lukina, A. ; Josypčuk, Bohdan ; Navrátil, Tomáš ; Pecková, K. ; Barek, J.
Preparation and first results achieved by composite silver solid amalgam electrodes (AgSA-CE) are presented. Polished, film as well as mercury meniscus modifications of these electrodes were studied by determination of p-nitrophenol, lead, cadmium, iodades, adenine, ascorbic acid and other compounds.
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Determination of herbicide dinoseb with amalgam and carbon electrodes
Fischer, J. ; Barek, J. ; Pecková, K. ; Zima, J. ; Kücükkolbasi, S. ; Ersöz, M. ; Kara, H. ; Josypčuk, Bohdan ; Navrátil, Tomáš
Dinoseb, systematically 2-(1-methylpropyl)-4,6-dinitro-phenol, is phenolic, commonly used herbicide and insecticide. Dinoseb has two very easy reducible nitro-groups in its structure and one electrochemically oxidizable hydroxy group. Differential pulse voltammetry was applied for its determination in water. The nitro group reduction was used for voltammetric determination with hanging mercury electrode (HMDE), mercury film electrode (MFE) and modified carbon paste electrode (MCPE) and carbon paste electrode (CPE) as well as meniscus modified silver solid amalgam electrode (m-AgSAE).
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Essential contribution of d.c. chronopotentiometry to bioelectrochemistry
Heyrovský, Michael
By means of the direct current derivative adsorptive stripping chronopotentiometric method the substances, that catalyze evolution of hydrogen on electrodes characterized by high hydrogen overvoltage, produce a prominent cathodic peak on the polarization curve in the negative potential region, where on d.c. polarographic curves appears the "pre-sodium wave". That chronopotentiometric peak, called "peak H", is an electrochemical signal considerably more sensitive than the Brdička’s catalytic signal appearing in presence of Co ions on d.c. polarographic or voltammetric curves, and it is much more versatile with respect to experimental conditions. As almost every biologically important compound is able to catalyze hydrogen evolution from a particular solution, it is almost always possible to find specific "peak H" which would allow a given compound to be determined and followed in high dilution. The electrochemical team in the Institute of Biophysics in Brno found so far a variety...
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Electrochemical study of the effect of long-term creatine supplementation creatine on human metabolism
Šenholdová, Z. ; Navrátil, Tomáš ; Heyrovský, Michael ; Pelclová, D.
The volunteers were supplemented in time interval of one month by creatine. Body parameters (mass, height, intra- and extracellular water content etc.), levels of vitamins and a few other compounds in urine and in blood (vitamine B12, homocysteine, thiodiglycolic acid, creatine, creatinine etc.) were followed. The corresponding metabolic processes are studied.
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Vliv kreatinu aplikovaného jako potravinový doplněk na exkreci homocysteinu do krve a kyseliny thiodiglykolové do moře
Přistoupilová, K. ; Navrátil, Tomáš ; Šenholdová, Z. ; Přistoupil, T. I. ; Heyrovský, Michael ; Kohlíková, E. ; Petr, M. ; Pelclová, D.
Single-dose food supplementation of creatine (5 g of creatine per day), commonly used by sportsmen, affects their metabolism of thiocompounds and of some compounds in blood and in urine, the metabolism of which is connected with the synthesis of creatine or with its usage in the body. In blood the levels of folates, vitamin B12, homocysteine, triacylglycerols, total cholesterol, LDL cholesterol and HDL cholesterol, uric acid, cortizol, and testosterone were followed. In urine the changes in levels of creatine, creatinine, thiodiglycolic acid (TDGA), and pH were followed. The results were accomplished by data of bioimpedance measurements (body mass, muscle mass, body fat, intra- and extracellular fluids, total body water content, protein content, fitness score). It was found that according to the changes in creatine levels before and after administration of creatine in course of one month, it was possible to divide the subjects under study into four groups.
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