Table 2. DPPH radical scavenging activity of 70% methanolic extract of D. takeshimana from Ulleung Island and its organic solvent-soluble portions

Samples	Scavenging activity (%)					IC50(μg/mL)
	500 μg/mL	250 μg/mL	125 μg/mL	62.5 μg/mL	31.3 μg/mL
70% MeOH ext.	77.3±1.31)c2)	55.9±0.8c	31.8±0.5c	14.5±0.6d	12.5±0.3c	213.9±3.4d
n-Hexane layer	33.8±0.9f	20.7±0.2f	14.9±0.4f	7.2±0.3f	3.2±0.3f	>500a
EtOAc layer	89.5±1.2b	66.3±1.0b	48.8±0.6b	28.9±0.4b	20.5±0.4b	127.3±2.1e
n-BuOH layer	71.0±1.0d	50.1±0.6d	29.4±0.5d	19.4±0.3c	12.6±0.2d	247.3±3.5c
H2O layer	51.2±0.8e	35.0±0.3e	23.1±0.3e	12.9±0.2e	8.7±0.1e	492.2±4.6b
(+)-Catechin3)	99.9±1.8a	95.6±1.4a	88.2±1.3a	73.4±1.3a	53.5±1.0a	22.2±0.6f

¹⁾Radical scavenging activities are expressed as the mean±SD of triplicate experiments.
²⁾Different letters (a-f) within the same column indicate significant differences (p<0.05).
³⁾(+)-Catechin was used as a positive control.