Table 4.
DPPH free radical scavenging ability of hot water extracts from root and aerial part of S. palmata

Concentration (μg/mL)	Extract		Control
	RHW	APHW	Ascorbic acid
	50	15.95 ± 1.74^b1)	11.83 ± 1.22^c	84.32 ± 0.63^a
100	50.09 ± 0.96^b	46.86 ± 1.42^c	86.40 ± 0.37^a
300	67.58 ± 1.20^b	64.03 ± 1.44^c	89.46 ± 0.80^a
500	81.59 ± 1.53^b	72.01 ± 1.01^c	91.43 ± 0.62^a
1,000	90.32 ± 0.69^b	86.88 ± 0.71^c	95.07 ± 0.24^a
2,000	94.41 ± 0.42^b	93.98 ± 0.51^b	96.85 ± 0.18^a
IC₅₀	99.87 ± 0.84^b	118.29 ± 4.92^c	48.79 ± 0.13^a

Values represent the mean±SD and mean with different superscripts within the row are significantly different at p<0.05 by Duncan’s multiple range test. IC₅₀ values were determined by linear regression analysis.