All solvents were purchased from Sigma–Aldrich and distilled
under vacuum before use. 2,2-diphenyl-1-picrylhydrazyl (DPPH),
BHT (P97%), a-tocopherol (P98%) and benzoyl peroxide (75%)
were purchased from Sigma–Aldrich. They were used as received
and kept at a temperature lower than 5 C.