Počet záznamů: 1
Adsorption/desorption of biomacromolecules involved in catalytic hydrogen evolution
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SYSNO ASEP 0488373 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Adsorption/desorption of biomacromolecules involved in catalytic hydrogen evolution Tvůrce(i) Strmečki, S. (HR)
Paleček, Emil (BFU-R) RID, ORCIDCelkový počet autorů 2 Zdroj.dok. Bioelectrochemistry. - : Elsevier - ISSN 1567-5394
Roč. 120, APR2018 (2018), s. 87-93Poč.str. 7 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. CH - Švýcarsko Klíč. slova surface-active substances ; free electrochemical analysis ; mercury-electrodes Vědní obor RIV CG - Elektrochemie Obor OECD Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis) CEP GA15-15479S GA ČR - Grantová agentura ČR Institucionální podpora BFU-R - RVO:68081707 UT WOS 000425575800011 DOI https://doi.org/10.1016/j.bioelechem.2017.11.013 Anotace Previously, it has been shown thatproteins and some polysaccharides (PSs) catalyse hydrogen evolution, producing electrochemical signals on mercury electrodes. The catalytic hydrogen evolution reaction (CHER) of the above-mentioned biomacromolecules was studied by voltammetric and chronopotentiometric stripping (CPS) methods. To obtain more information about electrode processes involving CHER, here we used protein such as BSA, and chitosan as a PS, in addition, we investigated dextran as a control PS not involved in CHER. We studied biomacromolecules by phase-sensitive alternating current (AC) voltammetry. Using phase-in AC voltammetry, for CHER-involved biomacromolecules we observed a CHER peak at highly negative potentials, similar to that observed with other voltammetric and CPS methods. On the other hand, by means of the adsorption/desorption processes studied in phase-out AC voltammetry, we uncovered a sharp and narrow decrease of capacitive current in the potential range of the CHER peak, denominated as the tensammetric minimum. This minimum was closely related to the CHER peak, as demonstrated by similar dependences on specific conditions affecting the CHER peak such as buffer capacity and pH. A tensammetric minimum was not observed for dextran. Our results suggest specific organization of biopolymer layers at negative potentials observed only in biomacromolecules involved in CHER. (C) 2017 Elsevier B.V. All rights reserved. Pracoviště Biofyzikální ústav Kontakt Jana Poláková, polakova@ibp.cz, Tel.: 541 517 244 Rok sběru 2018
Počet záznamů: 1