Table 2 Antioxidant activity (as % and IC₅₀) of the four promising algal fractions from the crude extract {(0.316 mg/L (Cu) of C.vulgaris compared to BHT and vitamin C as standards against DPPH (%) radical method

30 min.

60 min.

30 min.

60 min.

30 min.

60 min.

30 min.

60 min.

30 min.

60 min.

30 min.

60 min.

500

95.1±12.0^a

96.1±1.6^a

94.0±2.0^a

95.1±2.1^a

97.2±2.1^a

97.1±2.1^a

93.7±2.0^a

92.±1.9^a

96.3±1.5^a

97.4±3.0^a

93.4±1.1^a

94.5±2.8^a

250

82±1.34^b

80.5±1.8^b

83.3±1.9^b

82.6±1.9^b

86±1.20^b

85.7±1.9^b

80±1.4^b

81.±1.8^b

92.7±1.0^b

93±2.2^b

90.3±1.0^b

90.9±2.2^b

125

77±1.08^c

77.5±1.6^c

74.5±1.7^c

75.8±1.3^c

84.0±81.5^b

83.9±1.4^c

78.5±2.0^c

77.1±1.3^c

90.3±0.9^c

89.0±2.0^c

88.8±0.9^c

88.3±1.9^c

62.50

60.7±1.11^d

61.1±1.7^d

63.3±1.6^d

64.8±1.3^d

79.5±1.02^c

80.7±1.9^d

71±1.0^d

70.9±1.9^d

84.4±0.4^d

84.9±2^d

83.7±1.1^d

85.9±1.0^d

31.25

59.3±0.9^d

60.9±0.9^d

56.3±1.1^e

55.1±1.1^e

74.4±1.2^d

75.9±1.4^e

60.3±0.9^e

61.9±1.2^e

72.7±0.5^e

73.2±1.9^e

68.2±0.7^e

69.5±0.9^e

15.62

57.5±0.8^e

56.9±0.7^e

53.5±1.2^f

54.0±0.9^e

65.8±1.3^e

67.09±1.^f

59.3±0.7^e

60.4±1.1^e

70.2±0.8^f

69.4±1.2^f

64.4±0.5^f

63.0±0.9^f

IC₅₀

13.58

13.72

14.59

14.46

11.87

11.65

13.18

12.93

11.1

11.2

12.1

12.9