Dynamic Comparison of Free Radical Scavenging Abilities of Hypericum Perforatum L., Herba Verbenae Officinalis, and Valeriana Officinalis L. Extracts

Yi-ming Li¹,Yan-Ru Liu^2,3, Bing-Kun Xiao², Jian-Yun Yang², Rong-Qing Huang^2*

¹Anhui Medical University,Hefei 230032, P. R.China;

²Beijing Institute of Radiation Medicine, Haidian District, Beijing 100850, P.R. China;

³The School of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenhe District, Shenyang 110016, P.R. China