TPCs were highly positively
correlated with DPPH (r = 0.9733, P < 0.001), ABTS (r = 0.9490,
P < 0.001), and FRAP (r = 0.9646, P < 0.001), which indicated that the
phenolic compounds of these herbal teas had both hydrogen and
electron-donating abilities of antioxidant capacity (Table 3).