Abstract
An on-site electrochemical antioxidant capacity measurement system was developed using a screen print electrode (SPE) and circuit tester. The antioxidant capacities of eight antioxidants were evaluated with the handheld electrochemical antioxidant capacity measurement system to compare with those measured with spectroscopic methods, namely, oxygen radical absorbance capacity (ORAC) and 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging assays, as well as the reported electrochemical method with three conventional electrodes (a glassy carbon electrode, Ag/AgCl electrode and platinum wire electrode) and a potentiostat. Additionally, the potential shifts were proportional to the logarithm of the antioxidant concentration, which obeyed the Nernstian equation. Moreover, the antioxidant capacities of extracts from vegetables (green pepper, ginger and eggplant) were measured with a handheld electrochemical system. Each measurement was finished in only ca. 3 min. The electrochemically obtained antioxidant data were comparable to those from DPPH free-radical scavenging assays and superoxide anion scavenging activity (SOSA) assays, as well as the total phenolic compound content.
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Acknowledgements
This work was supported by the JSPS Core-to-Core Collaboration in Advanced Research Network, International Network on Polyoxometalate Science for Advanced Functional Energy Materials, the Cooperative Research Program of “Network Joint Research Center for Materials and Devices”, Cabinet Office grant-in-aid, and the Advanced Next-Generation Greenhouse Horticulture by IoP (Internet of Plants), Japan.
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Advance Publication Released Online by J-STAGE September 24, 2021.
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Ishida, H., Yamasaki, N., Otsuka, Y. et al. Electrochemical antioxidant capacity measurement: a downsized system and its application to agricultural crops. ANAL. SCI. 38, 151–156 (2022). https://doi.org/10.2116/analsci.21P217
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DOI: https://doi.org/10.2116/analsci.21P217