Fig. 1. Antioxidant activities and principal component analysis. A, 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activities of wild-rice grass tea-bag samples roasted at different temperatures. B, DPPH radical scavenging activities of wild-rice grass tea-bag samples infused with boiled mineral water for 5 min. C and D, Contents of total phenols and total flavonoids in wild-rice grass tea roasted at different temperatures before and after infusing the grass tea-bag with boiled mineral water for 30 s. Different lowercase letters above the bars in A-D indicate significant differences (P < 0.05) between groups. E, Principal component analysis for wild-rice tea-bag samples.