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(A) DPPH radical scavenging activity, (B) ABTS radical scavenging activity, (C) reducing power and (D) NO scavenging ability of Alnus firma at various concentrations. All values are expressed as the mean ± standard deviation. *P<0.05 vs. 50 μg/ml; #P<0.05 vs. 25 μg/ml, according to one-way analysis of variance. NO, nitric oxide; DPPH, 1,1-diphenyl-2-picryl hydrazyl radical; ABTS, 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid); OD, optical density.
