“When alpha-tocopherol was depleted by the interaction with ferric ion , it acted solely as a prooxidant, whereas if some alpha-tocopherol remained, it acted as an antioxidant.”
“ alpha-Tocopherol incorporated into artificial liposomal membranes reduced ferric ion rapidly to give more reactive ferrous ion, and alpha-tocopherol acted either as an antioxidant or as a prooxidant depending on the experimental conditions.”