Adsorption/desorption of biomacromolecules involved in catalytic hydrogen evolution

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081707%3A_____%2F18%3A00488373" target="_blank" >RIV/68081707:_____/18:00488373 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.bioelechem.2017.11.013" target="_blank" >http://dx.doi.org/10.1016/j.bioelechem.2017.11.013</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.bioelechem.2017.11.013" target="_blank" >10.1016/j.bioelechem.2017.11.013</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Adsorption/desorption of biomacromolecules involved in catalytic hydrogen evolution

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Adsorption/desorption of biomacromolecules involved in catalytic hydrogen evolution

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Projekt

<a href="/cs/project/GA15-15479S" target="_blank" >GA15-15479S: Nové nástroje pro výzkum a diagnostiku nemocí. Mikrofluidické reaktory a elektrochemie pro analýzu proteinů a jejich glykosylaci.</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Bioelectrochemistry

ISSN

1567-5394

e-ISSN

—

Svazek periodika

120

Číslo periodika v rámci svazku

APR2018

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

7

Strana od-do

87-93

Kód UT WoS článku

000425575800011

EID výsledku v databázi Scopus

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