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DPPH radical scavenging activity of WEP and chlorogenic acid. Values are means ± SD (n = 3). The samples with different lower case letters indicate a significant difference from the vitamin C standard (P < 0.05). Vitamin C (0.1 mg/mL, 0.3 mg/mL, 1 mg/mL, and 3 mg/mL) is used as a positive control.
