(2)Oxygen free radical, OFR Types (1)the superoxide anion(O2) (2 the hydroxyl radical (oH (3 singlet oxygen (102) (4 hydrogen peroxide(H2O2)(2) Oxygen free radical, OFR Types： (1)the superoxide anion (O2 -) (2)the hydroxyl radical (OH ·) (3)singlet oxygen (1O2 ) (4)hydrogen peroxide (H2O2 )