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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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Complexation of zinc ions by the phytochelatin PC2
Šestáková, Ivana ; Serrano, N. ; Diaz-Cruz, J. M. ; Arino, C.
Contrary to mammaliam metallothioneins, where Zn(II) is coordinated by four sulphur atoms, no structural studies are available for complexes of Zn- phytochelatins. Based on earlier experiences with electrochemical study of complexes of simplest phytochelatin-PC2- with cadmium ions, voltammetry and constant current chronopotentiometry on HMDE were used to study complexation of this phytochelatin with zinc ions. Overlapping of signals was overcome by the application of multivariate curve resolution method by alternating least squares. As result, structures with two or four sulphur atoms participating on Zn(II) complexation were suggested.
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Voltametrie vysoce dispergovaných měděných prášků na rtuťových elektrodách
Heyrovský, Michael ; Korshunov, A. ; Bakardjieva, Snejana
Average size of majority of the tested powder particles was between 100 and 300 nm, which are kept in relatively stable dispersed form in electrolytic solutions by Brownian motion. Electrolytic activity of the particles was due to 10-30 nm thick surface layer of copper oxides, the outer side consisting of CuO, the inner side of Cu.sub.2./sub.O. The current due to electroreduction of surface copper oxides followed particulate mechanism: on fortuitous contact of particle with electrode surface an immediate transfer of a number of electrons takes place, determined by time of the contact and by several dynamic and steric factors. No diffusion flux of particles to electrode surface is established. The potential of particulate electroreduction is determined by electronic structure of the actual form of the solid state particle.
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The use of electrochemistry for the study of human metabolism of sulfur-containing compounds
Navrátil, Tomáš ; Petr, M. ; Šenholdová, Z. ; Přistoupilová, K. ; Přistoupil, T. I. ; Heyrovský, Michael ; Pelclová, D. ; Kohlíková, E.
The contribution deals with explanation of metabolism of 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; from 4 to 6 hours after creatine supplementation the level of thiodiglycolic acid and pH in urine rapidly increase, both of them then decrease rapidly to the original values.
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Multichannel device for electrochemical measurements
Navrátil, Tomáš ; Josypčuk, Bohdan
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, using PCI interface card. Special 8-chanel sensor, consisting of 8 various solid electrodes (e.g., 5 solid amalgam electrodes, and one electrode of each, glassy carbon, platinum, and gold) can be connected to this device.
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Creatine fortification in relation to homocysteinemia
Kohlíková, E. ; Petr, M. ; Šenholdová, Z. ; Navrátil, Tomáš ; Heyrovský, Michael ; Přistoupilová, K. ; Přistoupil, T. I.
Some people supplement their diet by high doses of creatine (CR) to increase their muscle performace. In this way, they intensify the biochemical processes on cell membranes. The water thus formed is retained in the cells, which increases the body mass. The organism must remove exogenously added CR, probably in a similar way as in removing xenobiotics via oxidation with cyt.P450 to 2C units to cooperation with GSH. Our new simple and cheap voltammetric method enables to estimate thiogycolic (TDGA), the natural product of oxidative catabolism of thiocompounds, excreted to urine in regular catabolic processes.
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Different metabolic pathwazy of the origin of hyperhomosysteinemia
Přistoupilová, K. ; Přistoupil, T. I. ; Navrátil, Tomáš ; Heyrovský, Michael ; Šenholdová, Z. ; Kohlíková, E. ; Petr, M.
Our voltammetric method of estimation of thiodiglycolic acid (TDGA) in urine was used in case of a woman suffering from rare inborn inability to metylate homocysteine (HoCySH). The aim of this pilot study was to shed more light on the interrelationship among vitamin B.sub.12./sub., folates, and betaine used for her cure. On the basis of the achieved results we were able to modify our earlier published metabolic scheme. It comprises 3 metabolic pathways starting from serine, and three metabolic pathways starting from HoCySH.
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