Table 1.

Radical scavenging activity of six parts ofA. zerumbetextracts on DPPH, ABTS and PMS-NADH superoxide

Sample	Extraction	Inhibitory effect (IC50; μg/mL)
		DPPH	ABTS	PMS-NADH
BHT		11.74 ± 0.15 a 1	14.26 ± 0.16 a	24.80 ± 0.98 a
Rhizome	Aqueous	25.31 ± 0.67 b	73.94 ± 1.23 b	64.70 ± 0.72 c
	Ethanol	145.07 ± 1.68 e	155.86 ± 4.09 f	113.37 ± 1.24 d
Stem	Aqueous	144.03 ± 0.27 e	127.97 ± 1.70 d	215.09 ± 0.28 h
	Ethanol	293.08 ± 0.17 g	223.17 ± 0.26 i	132.27 ± 1.33 e
Leaf	Aqueous	165.60 ± 0.44 f	143.77 ± 1.37 e	191.24 ± 0.20 g
	Ethanol	586.47 ± 0.77 j	206.65 ± 0.85 h	168.23 ± 4.77 f
Flower	Aqueous	132.19 ± 1.02 c	140.50 ± 1.18 e	117.32 ± 1.46 d
	Ethanol	559.01 ± 3.61 h	293.90 ± 3.64 k	210.50 ± 4.03 h
Pericarp	Aqueous	140.91 ± 0.30 de	163.41 ± 1.07 g	169.02 ± 1.01 f
	Ethanol	580.38 ± 0.26 i	246.71 ± 0.85 j	166.11 ± 0.52 f
Seed	Aqueous	10.33 ± 0.03 a	84.29 ± 0.72 c	58.55 ± 0.31 b
	Ethanol	136.63 ± 0.33 cd	137.92 ± 1.74 e	56.12 ± 1.08 b

¹ The data represent the means ± SD of three determinations. Values with the same letter are not significantly different (p = 0.01) from each other.