Table 4 Antioxidant activity of crude pigment extract and γ-ray treated samples using DPPH and ABTS assay

Conc. (µg.ml⁻¹)

Crude pigment

1 kGy

3 kGy

5 kGy

0.05

21.8 ± 2.44

15.52 ± 0.65

10.96 ± 4.38

1.16 ± 1.14

0.1

31.86 ± 3.07

20.58 ± 0.62

15.98 ± 0.51

3.45 ± 1.02

0.15

45.94 ± 0.44

28.23 ± 0.88

23.05 ± 1.12

7.04 ± 0.51

0.2

55.18 ± 1.54

42.22 ± 2.81

27.68 ± 0.71

12.06 ± 2.25

0.5

65.36 ± 3.88

61.06 ± 2.02

32.93 ± 1.90

16.20 ± 0.61

1

84.13 ± 4.08

75.13 ± 1.36

42.56 ± 0.68

20.03 ± 1.03

Conc. (µg.ml⁻¹)

ABTS assay

Crude pigment

1 kGy

3 kGy

5 kGy

0.05

19.68 ± 0.02

19.13 ± 2.18

15.14 ± 1.84

0.99 ± 0.78

0.1

40.54 ± 0.03

29.70 ± 0.69

22.44 ± 0.27

3.09 ± 1.09

0.15

56.50 ± 0.01

38.4 ± 0.51

30.52 ± 1.17

5.17 ± 0.54

0.2

66.30 ± 0.72

49.47 ± 0.64

45.62 ± 1.52

9.38 ± 1.60

0.5

75.73 ± 0.07

66.93 ± 0.75

53.42 ± 3.45

15.64 ± 1.38

1

87.75 ± 0.01

77.86 ± 0.82

69.79 ± 1.56

18.62 ± 0.5