Automated electrochemical determination of beer total antioxidant capacity employing microdialysis online-coupled with amperometry

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F22%3A73615446" target="_blank" >RIV/61989592:15310/22:73615446 - isvavai.cz</a>
Alternative codes found
RIV/00216224:14310/22:00127045
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0026265X22007834" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0026265X22007834</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.microc.2022.107955" target="_blank" >10.1016/j.microc.2022.107955</a>

Result language
angličtina
Original language name
Automated electrochemical determination of beer total antioxidant capacity employing microdialysis online-coupled with amperometry
Original language description
Electrochemical techniques are rarely applied for the evaluation of total antioxidant capacity of beers due to severe electrode inactivation (fouling) by adsorbed oxidation products of the species present in the samples. In this work, we show that microdialysis online-coupled with amperometry is suitable for beer analysis, permitting also an assay automation. The working electrode of the amperometric detector employs a carbon fiber micro -electrode that is regenerated between the analyses by short (1 sec) rapid (50 Hz) sinusoidal potential cycling between 0 and 2.9 V vs Ag/AgCl. This step, along with the sample cleanup by microdialysis effectively removes electrode fouling. The suitability of this approach for beer analysis was studied using eight different beers produced by international manufacturers. The results were compared with standard Kaneda diphenylpicrylhy-drazil (DPPH) assay. Steady state currents, obtained at 600 mV vs Ag/AgCl correlate well with the results ob-tained with Kaneda method and thus can be used for quantification of beers' antioxidant capacities. HPLC-ED of microdialysates with and without DPPH treatment were employed to get an insight into DPPH reactivity with beer components.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10406 - Analytical chemistry

Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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