Table 6
Comparison of DPPH radical scavenging effects of water , ethanol and methanol extracts of cactus Chounnyouncho (Opuntia humifusa) (Unit: %)

Samples		Treatment concentration (ppm)³⁾				RC₅₀ (μg/mL)
Samples		250	500	1000	2000	RC₅₀ (μg/mL)
Cs¹⁾powder	Water1	12.28±0.02^e4)	25.66±0.00^e	31.85±0.01^e	39.59±0.05^e1	1105.10
	EtOH	16.00±0.01^b	29.36±0.01^b	37.72±0.01^b	46.93±0.01^b9	956.30
	MeOH	13.36±0.02^d	27.20±0.01^c	35.01±0.01^c	45.20±0.01^c9	982.40
Cf²⁾powder	Water	15.48±0.01^c	25.33±0.01^e	32.25±0.01^d	40.89±0.02^e1	1105.30
	EtOH	16.05±0.01^b	26.12±0.01^d	31.22±0.01^e	41.62±0.01^d1	1020.40
	MeOH	13.06±0.00^d	23.91±0.03^f	28.80±0.02^f	39.48±0.01^e1	1123.50
Ascorbic acid		92.13±0.01^a	92.00±0.01^a	93.01±0.01^a	93.93±0.00^a	10.50
BHA		91.25±0.01^a	91.87±0.01^a	92.87±0.01^a	93.13±0.01^a	35.05
F-value		3,725.17^***	2,663.21^***	2,260.20^***	1,788.35^***

¹⁾Cs, cactus Chounnyouncho (O. humifusa ) stem.
²⁾Cf, cactus Chounnyouncho (O. humifusa ) fruit.
³⁾Radical scavenging effect.
⁴⁾Values are mean±SD (n=3). Means in a column by different superscripts are significantly different at 5% significance level by Duncan's multiple range test. ***p<0.001.