Compound

R

IC₅₀ values for free radical scavenging activity(µg/mL)

DPPH^•

OH^•

9

H

35.23 ± 0.083

35.65 ± 0.056

34.26 ± 0.010

10

p-CH₃

8.09 ± 0.074

7.56 ± 0.012

8.49 ± 0.098

11

p-OCH₃

3.78 ± 0.056

4.31 ± 0.063

4.23 ± 0.063

12

p-F

41.44 ± 0.053

40.46 ± 0.098

40.26 ± 0.057

13

p-Cl

37.92 ± 0.077

38.59 ± 0.0925

37.95 ± 0.090

14

p-Br

35.01 ± 0.084

37.93 ± 0.035

36.97 ± 0.091

15

p-CH(CH₃)₂

4.61 ± 0.071

4.59 ± 0.039

5.16 ± 0.093

BHT

-

5.46 ± 0.064

5.66 ± 0.013

5.86 ± 0.011