Table 2. DPPH radical scavenging activities of fraction extracts from P. persica twigs and its solvent-soluble portions

Samples	Scavenging activity (%)					IC50 values (μg/mL)
	500 μg/mL	250 μg/mL	125 μg/mL	62.5 μg/mL	31.3 μg/mL
Hot water	82.7±0.162)b3)	75.1±0.12d	51.0±0.17d	32.3±0.13d	13.0±0.16d	119.9±7.2a
n-Hexane layer	-4)	-	-	-	-	>500
EtOAc layer	99.9±0.13a	99.9±0.14a	80.1±0.13b	67.9±0.12b	44.5±0.12b	3.82±1.6e
n-BuOH layer	82.2±0.17b	81.9±0.15c	65.4±0.14c	50.4±0.16c	29.3±0.13c	6.82±2.4d
H2O layer	72.9±0.16c	56.3±0.16e	37.8±0.12e	21.1±0.13e	10.2±0.14e	105.8±4.5b
(+)-Catechin1)	99.9±0.12a	95.8±0.12b	92.4±0.14a	88.1±0.12a	72.6±0.15a	13.0±2.0c

(+)-Catechin was used as a positive control substance.
Mean±SD (n=3).
^a-eValues with different superscript letters in the column are significantly different (p<0.05).
-, not tested.