Table 1 The percentage yields and IC₃₀ values of free radical scavenging activities of STF extracts, its components and active compounds were obtained from DPPH assay and represented as Mean ± SEM. in triplicate experiments. IC₃₀ values indicated concentrations of the test compounds required to scavenge DPPH radical by 30%

1

L-ascorbic acid

-

-

-

3.32 ± 0.22

2

Piperine

-

-

-

>120

3

Gallic acid

-

-

-

8.04 ± 0.94

4

STF formula

-

-

19.78

19.62 ± 1.13

5

1,7, 7 – trimethylbicyclo (2.2.1) heptan −2- one (analytical camphor)

crystal

1.40

-

>120

6

Acorus calamus L.

root

8.80

1.73

>120

7

Anethum graveolens L.

seed

1.00

2.82

>120

8

Atractylodes lancea (Thunb.) DC.

root

0.50

6.83

>120

9

Baliospermum solanifolium (Burm.) Suresh

root

8.00

0.74

90.86 ± 16.96

10

Clausena excavate Burm.f.

stem

4.80

2.30

98.47 ± 4.81

11

Cuminium cyminum L.

seed

0.80

6.26

75.67 ± 11.63

12

Ferula assa-foetida Regel

gum

1.00

27.89

>120

13

Lepidium sativum L.

seed

1.10

7.83

49.43 ± 5.42

14

Merremia vitifolia (Burm.f.) Hallier.f.

stem

0.80

1.49

25.17 ± 2.34

15

Myristica fragrans Houtt.

fruit

1.30

1.01

19.99 ± 1.17

16

Myristica fragrans Houtt.

mace

1.20

2.02

31.35 ± 3.13

17

Nigella sativa L.

seed

0.70

9.21

>120

18

Pistacia chinensis subsp. integerrima (J. L. Stewart ex Brandis) Rech. f. Lagasca.

root

0.60

11.09

65.57 ± 8.81

19

Picrorhiza kurroa Royle ex Benth.

root

0.40

7.70

84.96 ± 1.18

20

Pimpinella anisum L.

seed

0.90

5.40

78.54 ± 7.47

21

Piper nigrum L.

fruit

24.00

0.03

>120

22

Piper retrofractum Vahl.

fruit

9.60

6.03

>120

23

Plumbago indica L.

root

22.40

2.30

72.88 ± 6.84

24

Terminalia chebula Retz.

fruit

10.40

28.29

5.14 ± 0.52

25

Terminalia chebula Retz.

gall

0.30

8.83

2.35 ± 0.18