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- W3204490325 endingPage "3262" @default.
- W3204490325 startingPage "3262" @default.
- W3204490325 abstract "Humic substances (HS) are natural supramolecular systems of high- and low-molecular-weight compounds with distinct immunomodulatory and protective properties. The key beneficial biological activity of HS is their antioxidant activity. However, systematic studies of the antioxidant activity of HS against biologically relevant peroxyl radicals are still scarce. The main objective of this work was to estimate the antioxidant capacity (AOC) of a broad set of HS widely differing in structure using an oxygen radical absorption capacity (ORAC) assay. For this purpose, 25 samples of soil, peat, coal, and aquatic HS and humic-like substances were characterized using elemental analysis and quantitative 13C solution-state NMR. The Folin-Ciocalteu method was used to quantify total phenol (TP) content in HS. The determined AOC values varied in the range of 0.31-2.56 μmol Trolox eqv. mg-1, which is close to the values for ascorbic acid and vitamin E. Forward stepwise regression was used to reveal the four main factors contributing to the AOC value of HS: atomic C/N ratio, content of O-substituted methine and methoxyl groups, and TP. The results obtained clearly demonstrate the dependence of the AOC of HS on both phenolic and non-phenolic moieties in their structure, including carbohydrate fragments." @default.
- W3204490325 created "2021-10-11" @default.
- W3204490325 creator A5005546025 @default.
- W3204490325 creator A5022027403 @default.
- W3204490325 creator A5038585505 @default.
- W3204490325 creator A5043632087 @default.
- W3204490325 creator A5047662720 @default.
- W3204490325 date "2021-09-25" @default.
- W3204490325 modified "2023-10-16" @default.
- W3204490325 title "A Systematic Study of the Antioxidant Capacity of Humic Substances against Peroxyl Radicals: Relation to Structure" @default.
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