Table 3 ABTS⁺ radical scavenging activity of the 80% methanolic extract of A. dioicus var. kamtschaticus roots and its n-hexane-, EtOAc-, n-BuOH-, and H₂O-soluble por tions

Sample (μg/mL)	Inhibition (%)					IC50 (μg/mL)1)
	200	100	50	25	12.5
	80% MeOH extract	94.2±2.7	88.6±2.2	42.6±2.0	21.5±1.1		12.8±0.7	31.9±1.2
n-Hexane layer	10.3±0.7	8.2±0.5	5.3±0.3	3.9±0.2	1.8±0.2	>200
EtOAc layer	91.0±2.8	85.1±2.4	82.8±2.1	60.9±1.8	35.4±1.5	18.9±2.1
n-BuOH layer	68.6±2.3	40.4±2.1	21.0±0.7	8.4±0.5	2.7±0.2	51.0±2.9
H2O layer	1.7±0.1	1.4±0.2	1.1±0.2	0.5±0.1	0.3±0.1	>200
(+)-Catechin2)	99.9±2.3	99.9±2.0	71.8±1.8	28.4±1.1	8.9±0.8	34.9±2.1

All samples were examined in triplicate experiments. Inhibitory effects are expressed as the mean±SD of triplicate experiments.
(+)-Catechin was used as a positive control.