Antioxidant Capacity of Teas and Herbal Infusions: Polarographic Assessment (CROSBI ID 186234)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Gorjanović, Stanislava ; Komes, Draženka ; Pastor, Ferenc T. ; Belščak-Cvitanović, Ana ; Pezo, Lato ; Hečimović, Ivana ; Sužnjević, Desanka
engleski
Antioxidant Capacity of Teas and Herbal Infusions: Polarographic Assessment
Hydrogen peroxide scavenging (HPS) activity of unfermented (green, yellow, and white), partially fermented (oolong), and completely fermented (black) tea (Camellia sinensis), maté (Ilex paraguariensis), and various herbal infusions, as well as individual compounds (flavan-3-ols, flavonols, cinnamic and benzoic acids, and methylxanthines), was assessed by recently developed direct current (DC) polarographic assay. Correlations of tea and herbal infusion HPS activity with total phenolic content determined using the Folin−Ciocalteu assay (FC-GAE) (0.81 and 0.93), ferric reducing/antioxidant power (FRAP)(0.97 and 0.92), 1, 1-diphenyl-2-picrylhydrazyl (DPPH) (0.77 and 0.80), and 2, 2′-azinobis(3-ethylbenzthiazoline-6-sulfonic acid)(ABTS) scavenging (0.86 and 0.86) were statistically significant. Correlations between relative antioxidant capacity index (RACI), calculated by assigning all applied assays equal weight, and HPS (0.98), FRAP (0.97), ABTS (0.89), and DPPH (0.89) confirmed DC polarographic assay reliability when applied individually. Correlation analysis, ANOVA, and Levene and Tukey’s HSD tests unequivocally confirmed this reliable, rapid, and low-cost assay validity, clearly demonstrating its advantages over spectrophotometric assays applied.
tea; herbal infusions; mate; antioxidant activity; hydrogen peroxide; DC polarography
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Podaci o izdanju
60 (38)
2012.
9573-9580
objavljeno
0021-8561
10.1021/jf302375t