DNA was isolated from human blood serum. A total of 10 μL of DNA sample was taken in separate microfuge tubes covered with black paper. Then about 10 μL of plant extract samples was added into the DNA sample, and this was mixed gently and then incubated for 10 min. After 10 min, 10 μL of Fenton’s reagent (ascorbic acid, FeCl3, H2O2) were added to the above and mixed well and incubated at room temperature for 1 h in dark condition. Then 15 μL from each of the above was taken and added with 3 μL of the 6伊 loading dye.