Table 1

Sample Concentration (%)	% DPPH inhibition	FRAP (miromol Fe(II) /g dry wt)	Total phenolics mg Catechol equivalents/l	β –carotene bleaching assay (% Anti-Oxidant Activity)
Essential oil
0.5	32.74 ± 0.02^a	82.25 ±0.05^a	29.49 ± 0.15^a	26.36±0.07^a
1	52.03 ± 0.04^b	123.42±0.04^b	58.89 ± 0.08^b	33.04±0.15^b
2	74.81 ± 0.05^c	167.35±0.07^c	106.6 ± 0.20^c	44.43±0.06^c
5	78.68 ± 0.04^d	190.52±0.12^d	130.70 ± 0.04^d	52.94±0.22^d
Aqueous extract
0.5	5.92 ± 0.02^a	24.75 ±0.04^a	ND	12.57±0.52^a
1	9.24±0.01^b	32.59 ±0.02^b	ND	13.48±0.45^b
2	13.27±0.01^c	35.42 ±0.02^c	ND	24.52 ±0.45^c
5	35.31±0.03^d	49.65 ±0.05^d	24.38 ±1.25^a	41.52 ±0.34^d
10	76.29±0.05^e	98.42±0.06^e	63.95 ±0.04^b	47.15±0.17^e
20	89.72±0.07^f	107.59 ±0.05^f	97.69 ±0.01^c	54.85±0.05^f

Where,
DPPH–2, 2- Diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay;
FRAP- Ferric Reducing Antioxidant Power assay;
Results are mean ± SD, n=3; Values within a column with different superscript letters are significantly (p<0.05) different. ND = Not detected.

Table 1: Antioxidant activity of essential oil and aqueous extracts of ginger rhizome