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The DPPH radical-scavenging activity of gallic acid and gallic acid glucoside. The concentrations of 0, 0.01, 0.05, 0.1, 0.25, 0.5, 0.75, 1.0, and 2.0 mM were tested, and the reaction was monitored at 517 nm. The data are reported as mean ± SD of the three separate experiments
