Table 2

	Hexane extract	1	2	3	Trolox	BHA	Values standard
•OH scavenging (IC₅₀)	175.17 ± 3.99^a	165.05 ± 5.21^a	179.76 ± 2.19^a	186.54 ± 6.39^a	36.21 ± 1.73^b	28.26 ± 2.65 ^b	Mannitol 568.51 ± 7.24^c
•O₂⁻scavenging (IC₅₀)	1727 ± 49.77^c	800.29 ± 44.75 ^a	1585.35 ± 38.61^c	1905.21 ± 52.03^c	2231 ± 58.87^c	2276 ± 62.34^b	Quercetin 44.61 ± 8.42^d
Fe2+-chelating (IC₅₀)	903.30 ± 4.83^d	572.26 ± 5.50^d	749.12 ± 5.29^d	844.61 ± 7.20^d	28.63 ± 4.72^b	ND
DPPH• scavenging (IC₅₀)	22.51 ± 5.45^c	19.81 ± 6.11^c	26.36 ± 3.72^c	28.59 ± 6.30e	4.65 ± 0.69^b	12.49 ± 1.72^a	Ascorbic acid 5.34 ± 0.19^b
ABTS•+ (IC₅₀) µM	441.35 ± 4.56^c	438.30 ± 6.37^c	559.57 ± 8.26^d	587.10 ± 5.39^d	9.73 ± 2.19^b	7.85 ± 1.29^b
TEAC µM	0.876 ± 0.006^b	1.830 ± 0.023^b	0.621 ± 0.003^c	0.321 ± 0.006^d	ND	ND
ORAC (1 ORAC unit/1µmol trolox)	37.65 ± 10.23^c	24.55 ± 9.52^a	33.32 ± 7.67^c	36.75 ± 8.59^c	ND	ND	Quercetin 8.56 ± 2.43^b
NO• (%)	57.36 ± 3.73^c	60.59 ± 4.12^c	58.38 ± 6.73^c	50.48 ± 7.31^c	ND	ND	Curcumin 59.25 ± 2.90^c
ONOO• (%)	65.94 ± 6.29^a	67.37 ± 2.10^a	58.31 ± 4.41^a	52.47 ± 4.28^a	ND	ND	Quercetin 72.46 ± 5.19^a
H2O2 (%)	150.42 ± 5.80^a	128.13 ± 3.54^c	149.13 ± 5.32^a	167.21 ± 6.58^a	74.41 ± 4.72^b	77.69 ± 8.41^b	α-Tocopherol 67.82 ± 5.34^b
SOD scavenging (%)	79.52 ± 5.45^b	73.52 ± 5.45^b	76.28 ± 3.63^b	79.87 ± 4.38^b	44.73 ± 4. 65^a	49.43 ± 3. 18^a	α-Tocopherol 44.63 ± 4.60^a
Lipid Peroxidation (%)	52.75 ± 12.32^d	50.13 ± 14.21^d	46.39 ± 9.48^d	37.15 ± 4.88^a	86.50 ± 9.78^b	80.74 ± 6.52^b	α-Tocopherol 69.36 ± 5.14^c
HOCl (%)	30.77 ± 3.61^a	33.86 ± 6.04^a	37.25 ± 4.82^b	45.54 ± 5.49^b	ND	ND	Quercetin 27.63 ± 2.57a Ascorbic acid (4.17 ± 0.87c)
FRAP mg/eq Vit C/g DE	9.32 ± 1.03 ^c	11.56 ± 2.25 ^c	8.75 ± 2.53 ^c	7.21 ± 1.53 ^c	ND	ND	Butylated hydroxyl toluene (BHT) 35.17 ± 5.12 ^a

IC₅₀ value (μg/ml) is defined as the concentration of 50% effect percentage and expressed as Mean ±SD (n = 4). Means values with different superscripts in the same row are significantly different (p<0.05), while with same superscripts are not significantly different (p<0.05). ND, cannot detected.

Table 2: Antioxidant activities of diterpenes 1-3.