Table 2 DPPH radical scavenging activity of 80% methanol extract of Mongolian I. bungei and its n-hexane, EtOAc-, n-BuOH-, and H₂O-soluble fractions

Samples	Inhibition (%)					IC50 (μg/mL)
	500	250	125	62.5	31.3
	80% MeOH ext.	72.0±1.2c1)	58.1±0.2c	46.0±1.3c	31.2±1.3c		11.4±2.0bc	173.2±16.8
n-Hexane layer	61.8±1.7e	45.7±1.2e	28.5±0.8e	19.9±1.4d	10.4±1.8cd	310.4±11.1
EtOAc layer	80.2±1.1b	59.4±0.8b	48.2±1.3b	32.2±1.6b	14.3±0.2b	148.7±11.6
n-BuOH layer	40.2±0.2f	32.5±1.1f	24.3±1.5f	16.7±2.2e	9.8±0.8d	>500
H2O layer	64.3±0.9d	52.7±1.2d	41.2±1.7d	34.4±1.5b	12.3±1.4b	217.6±12.6
(+)-Catechin2)	99.9±0.7a	99.8±0.4a	96.2±1.4a	87.6±1.1a	74.1±0.6a	15.0±0.9

Scavenging activities are expressed as the mean±SD of triplicate experiments. Mean separation within columns of respective seasons by Duncan’s multiple range test at p=0.05.
(+)-Catechin was used as a positive control.