Table 3. ABTS⁺ 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.	80.8±1.31)c2)	56.0±1.0c	26.5±0.8c	14.9±0.6d	6.8±0.2d	200.3±2.7d
n-Hexane layer	32.0±0.5f	12.2±0.4f	5.3±0.4f	3.1±0.3f	0.8±0.1f	>500a
EtOAc layer	95.1±1.2b	83.3±1.1b	74.2±1.1b	42.9±0.8b	18.5±0.5b	72.7±1.2e
n-BuOH layer	88.2±1.0d	64.2±0.9d	36.9±1.0d	22.0±0.8c	10.7±0.4c	165.2±2.5c
H2O layer	64.0±0.9e	33.4±0.7e	16.5±0.6e	5.6±0.2e	3.1±0.1e	365.9±3.8b
(+)-Catechin3)	99.9±1.8a	95.8±1.6a	88.5±1.5a	65.3±1.0a	31.9±0.9a	18.4±0.3f

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.