Correlation between two methods of antioxidant activity
Extracted samples from leaves at a concentration of 0.02 ppm were chosen to test the correlation
between the two methods. The percentage of antioxidant activity were between 65 and 80% for both
methods (Table 2). Fresh P. foetida and S. aqueum both had better antioxidant activity than the dried
samples. The correlation between the β-carotene oxidation and ABTS methods had R2 = 0.9878.