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@article{1668497,
author = {Hadjixenis, Antonios and Hrbáč, Jan and Prodromidis, Mamas},
article_number = {November},
doi = {http://dx.doi.org/10.1016/j.talanta.2020.121313},
keywords = {Bipolar electrochemistryEye visual detectionAntioxidant capacity; Phenolphthalein; Agarose hydrogel; Portable analytical device},
language = {eng},
issn = {0039-9140},
journal = {Talanta},
title = {A compact bipolar electrochemistry device utilizing a liquid free catholyte and eye visual indication of the reporting event for the determination of antioxidant capacity in real-world samples},
url = {https://reader.elsevier.com/reader/sd/pii/S0039914020306044?token=4CBB19CF095E2AB89E2FA8C6CC86C8A1A6E769C67FB201E829B32F8927EE225BC2CBB3E727AAA7887551CD488B8305EA},
volume = {219},
year = {2020}
}
TY - JOUR
ID - 1668497
AU - Hadjixenis, Antonios - Hrbáč, Jan - Prodromidis, Mamas
PY - 2020
TI - A compact bipolar electrochemistry device utilizing a liquid free catholyte and eye visual indication of the reporting event for the determination of antioxidant capacity in real-world samples
JF - Talanta
VL - 219
IS - November
SP - "121313"
EP - "121313"
PB - Elsevier
SN - 00399140
KW - Bipolar electrochemistryEye visual detectionAntioxidant capacity
KW - Phenolphthalein
KW - Agarose hydrogel
KW - Portable analytical device
UR - https://reader.elsevier.com/reader/sd/pii/S0039914020306044?token=4CBB19CF095E2AB89E2FA8C6CC86C8A1A6E769C67FB201E829B32F8927EE225BC2CBB3E727AAA7887551CD488B8305EA
L2 - https://reader.elsevier.com/reader/sd/pii/S0039914020306044?token=4CBB19CF095E2AB89E2FA8C6CC86C8A1A6E769C67FB201E829B32F8927EE225BC2CBB3E727AAA7887551CD488B8305EA
N2 - Here we report for the first time the development of a compact, closed bipolar electrochemistry (BPE) device for the determination of antioxidant capacity in real-world samples by recording the onset driving voltage at which an eye-visible reporting event at the cathode pole of bipolar electrode (BE) occurs. The BPE cell consists of two distinct anode and cathode compartments that are electrically connected through a platinum wire BE. The anode pole of the BE is covered by a cellulose acetate thin film to prevent the fouling of the surface, while the cathode pole is embedded into an agarose hydrogel containing phenolphthalein, i.e., an acid-base indicator. The method relies on the oxidation of the reducing compounds in the sample by a fixed amount of H2O2 and the electro oxidation of the remaining H2O2 in the anode pole of the BE. This reaction triggers the reduction of water at the cathodic pole accompanied by the production of hydroxyl ions at different, H2O2 concentration-dependent onset driving voltages. The resulting increase of pH at the cathode pole results in the formation of a pink spot (reporting event), which is visible by the unaided eye. The applicability of the BPE device for the determination of antioxidant capacity in fruit juices and sodas is demonstrated. The analytical results, expressed as Trolox (TEAC) or Vitamin C (CVEAC) equivalent antioxidant capacity, correlate well with those obtained by the CUPRAC method.
ER -
HADJIXENIS, Antonios, Jan HRBÁČ a Mamas PRODROMIDIS. A compact bipolar electrochemistry device utilizing a liquid free catholyte and eye visual indication of the reporting event for the determination of antioxidant capacity in real-world samples. \textit{Talanta}. Elsevier, roč.~219, November, s.~''121313'', 6 s. ISSN~0039-9140. doi:10.1016/j.talanta.2020.121313. 2020.
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