Antioxidant Capacities and Total Quercetin Content of Several Species of Polygonaceae in Mongolia

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Antioxidant capacities (AOCs) and total phenolic (TP) content of 11 species of Polygonaceae from Mongolia were evaluated using diphenyl picrylhydrazyl radical (DPPH), oxygen radical antioxidant capacity (ORAC) and Folin-Ciocalteu (F-C) assays. Additionally, total quercetin content was determined by high performance liquid chromatography (HPLC) after acid hydrolysis. These plant extracts showed high AOCs using both DPPH (111.9-950.5 μmol Trolox equivalent (TE) /g.dw) and ORAC assays (770.7-2307.9 μmol TE/g.dw), and high TP contents (20.84-113.86 mg Gallic acid equivalent (GAE)/g.dw). AOCs were positively correlated with TP content (DPPH: r = 0.98; ORAC: r = 0.83). Moderate correlations were observed between AOCs and total quercetin content (DPPH: r = 0.58; ORAC: r = 0.51). These results suggest that quercetin glycosides may be one of the important contributors to AOCs of Mongolian Polygonaceae species.