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Effects of ferulic acid and α-tocopherol on DPPH radicals. (A) Time dependent changes of DPPH radical by addition of ferulic acid at 10 μM (●) and 20 μM (▲) or α-tocopherol at 10 μM (○) and 20 μM (△) were assessed by measuring absorbance at 517 nm. (B) Percentage of DPPH radical scavenging by ferulic acid (black column) and α-tocopherol (grey column) measured at 15 min after addition of the compounds. Data are means ± SD (n = 3). *p<0.05.
