Abstract
The antioxidant interactions between selenium species and tea polyphenols were investigated using 1,1-diphenyl-2-picryl-hydrazyl (DPPH) radicals, cupric reducing antioxidant capacity (CUPRAC) and Folin–Ciocalteu (FC) assay. Se(IV) exhibited the lowest antioxidant properties in comparison to other selenium compounds in all assays. The highest reducing power was obtained for SeMet, while the highest ability to scavenging DPPH radicals for MeSeCys. The results obtained experimentally for the mixtures containing selenium species and green or black tea infusion were compared with theoretical values calculated by adding up the effects of both individual components analyzed separately. The results obtained from each assay clearly show that observed effect is not additive. In almost every case the theoretical value of antioxidant capacity was significantly higher from that obtained from the activity of the binary mixture of black tea infusion with selenium compound decreased in the order: SeMet > Se(IV) > Se(VI) > MeSeCys, while for similar mixtures with green tea infusion: MeSeCys > Se(VI) > SeMet ~ Se(IV).
Highlights
Selenium is widely known as an essential nutrient, which is linked with some serious conditions like cancer, cardiovascular and inflammatory diseases [34]
The aim of this study was to evaluate the antioxidant interactions between selected selenium species and tea polyphenols employing three methods: scavenging of the stable 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical, cupric reducing antioxidant capacity (CUPRAC) and Folin–Ciocalteu assay
There are many well-known methods that can be used for study the antioxidant activity [26]
Summary
Selenium is widely known as an essential nutrient, which is linked with some serious conditions like cancer, cardiovascular and inflammatory diseases [34]. It plays an important role in many metabolic pathways such as thyroid hormone metabolism and antioxidant defense systems [39]. One geographically specific selenium-enriched Ziyang tea (Camellia sinensis L.) is widely distributed in the seleniferous region, in Ziyang County, China [10]. Se-enriched tea has significantly higher content of phenolic compounds, which are the most abundant antioxidants in the diet [29]. Some selenium compounds or their metabolites can act as antioxidants, prooxidants or both depending of specific conditions [23, 34, 39]. Selenoaminoacids can provide antioxidant benefits by acting as a source of Se for synthesis of selenium-dependent
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