<prompt> Most powerful chain breaking antioxidant:Vitamin CAlpha - tocopherolCatalaseGlutathione peroxidase  <response>: Alpha- tocopherol is most powerful chain breaking anti-oxidants. 2 Classes of antioxidants Chain breaking anti - oxidants : They interfere with chain propagation Alpha - tocopherol Beta - carotene Vitamin C Super oxide dismutase SOD Uric acidUrate Polyphenols Preventive antioxidants: They reduce the rate of chain initiation Glutathione peroxidase Catalase Ceruloplasmin transferrin Chelate metal ions 