参考文献: 1. Valko, M. et al., 2006. Free radicals and antioxidants in normal physiological functions and human disease. Int. J. Biochem. Cell.Bio., 39(1): 44-84. 2. Sies, H., 1997. Oxidative stress: oxidants and antioxidants. Exp. Physiol., 82(2): 291-295.