Comparison of Chemical Composition and Bioactivities of Essential Oils from Fresh and Dry Rhizomes of Zingiber zerumbet (L.) Smith

Table 2

Antioxidant ability of FR-EO and DR-EO of Z. zerumbet and zerumbone.

Sample	DPPH		ABTS
	IC50 (μg/mL)^a	AEAC (mg/100 g)^b	IC50 (μg/mL)^a	AEAC (mg/100 g)^b
DR-EO	17416.04 ± 3274.95	9.01	2884.67 ± 232.71	74.90
FR-EO	32385.39 ± 5628.23	4.85	2926.68 ± 104.28	73.82
Zerumbone	90293.12 ± 3529.38	1.74	10840.13 ± 938.35	19.93
BHT^c	29.25 ± 1.87		7.47 ± 0.12
Ascorbic acid^c	1.57 ± 0.23		2.16 ± 0.43

^aIC₅₀: the concentration of sample that affords a 50% reduction in the assay, expressed as the means ± SD of triplicate experiments. ^bAEAC (ascorbic acid equivalent antioxidant capacity) = (IC_50(AA)/IC_50(Sample)) × 10⁵. ^cBHT and ascorbic acid as positive control.