Compound No Absorbance of samples (λ) % inhibition
Control of ABTSa 0.474 0%
Ascorbic acid 0.048 89.87%
8a 0.466 6.23%
8b 0.050 89.93%
8c 0.358 27.96%
8d 0.418 15.89%
8e 0.370 25.55%
9a 0.020 95.97%
9b 0.102 79.47%
11 0.183 63.17%
12 0.171 65.59%
aABTS: The method used for antioxidant activity
(%) Inhibition = [A (control) - A (test) /A (control)] x 100
Table 1: ABTS Antioxidant activity assay of compounds 8a-e, 9a,b, 11 and 12.