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Portable Device for Potentiometric Determination of Antioxidant Capacity

Authors :
Alla V. Ivanova
Maria G. Markina
Source :
Sensors, Vol 23, Iss 18, p 7845 (2023)
Publication Year :
2023
Publisher :
MDPI AG, 2023.

Abstract

For the first time, a prototype of a portable device for the potentiometric determination of antioxidant capacity based on a new measurement principle is proposed. A feature of the approach is the use of an electrochemical microcell with separated spaces and two identical electrodes with immobilized reagents. An antioxidant solution is introduced into one half-cell, and the antioxidants interact with the reagents. The other half-cell contains only reagents. The potential difference between the electrodes is due to the change in the ratio of the oxidized and reduced form of the reagents, which occurs as a result of the reaction with the antioxidants in one of the half-cells and is related to their concentration. The range of linearity of the microcell with immobilized reagents is 40–4000 μM-eq, and the limit of detection is 20 μM-eq. The device was successfully tested in the analysis of standard antioxidant solutions. The recoveries were (92–113)%, and the relative standard deviation did not exceed 15%. A good correlation was found between the data obtained by the approach and the potentiometric method in a macrocell for fruit juice analysis. Pearson’s coefficient for the obtained experimental data was 0.9955. The proposed portable device is promising and can be used in field conditions.

Details

Language :
English
ISSN :
14248220
Volume :
23
Issue :
18
Database :
Directory of Open Access Journals
Journal :
Sensors
Publication Type :
Academic Journal
Accession number :
edsdoj.830c4b5286224534b9fbc106a8633fc5
Document Type :
article
Full Text :
https://doi.org/10.3390/s23187845