New Electrochemical Evaluation of the Antioxidant Capacity of Beverages with Polyoxometalates as Redox Probes

A new method was developed to evaluate antioxidant activity based on the redox properties of polyoxometalates, which are partially reduced by antioxidants to generate a limiting potential. The polyoxometalates [PMo12O40]3−, [PVW11O40]4− and [SV2W10O40]4− formed in situ were used as electrochemical p...

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Bibliographic Details
Published in:Analytical Sciences 2016/08/10, Vol.32(8), pp.825-830
Main Authors: UEDA, Tadaharu, OKUMURA, Takashi, TANAKA, Yukino, AKASE, Saki, SHIMAMURA, Tomoko, UKEDA, Hiroyuki
Format: Article
Language:English
Subjects:
activity
Analytical Chemistry
Antioxidant
capacity
Chemistry
polyoxometalate
potentiometry
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Summary:A new method was developed to evaluate antioxidant activity based on the redox properties of polyoxometalates, which are partially reduced by antioxidants to generate a limiting potential. The polyoxometalates [PMo12O40]3−, [PVW11O40]4− and [SV2W10O40]4− formed in situ were used as electrochemical probes for the new evaluation method, and their formation conditions were optimized to evaluate the antioxidant activities of gallic acid, ellagic acid, catechin, quercetin, morin, trans-ferulic acid, sesamol, α-tocopherol, δ-tocopherol and L-ascorbic acid. The observed difference between initial potential and limiting potential (ΔE) were compared with spectrophotometrically evaluated antioxidant activities. In addition, the antioxidant capacities of five beverages (Japanese green tea, concentrated catechin-containing green tea, grapefruit juice, red wine and Japanese sake) were evaluated.
ISSN:0910-6340
1348-2246
DOI:10.2116/analsci.32.825