Shade treatment of Synurus deltoides (Aiton) Nakai was carried out with 0, 35, and 55% shading net, and samples were marked as no shade, 35% shade, and 55% shade, respectively. We examined in vitro antioxidant and anti-inflammatory capacities using a 1,1-diphenyl-2-2-pricylhydrazyl (DPPH) radical scavenging assay, a reducing power assay, a total antioxidant assay, a metal chelating assay, a superoxide radical scavenging assay, and a nitric oxide inhibition assay. As a result, no shade and 35% shade possessed higher DPPH radical scavenging activity and reducing power ability than that of 55% shade. Notably, no shade had significantly higher total phenolic and flavonoid contents than those in the other samples. No shade exhibited significantly higher total antioxidant activity than that of 35% shade and 55% shade. However, the chelating ability of 55% shade was significantly greater than that of no shade and 35% shade; 55% shade also showed significantly higher anti-inflammatory capacity than that of no shade or 35% shade.
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