1. Biological Engineering Laboratory, College of Pharmacy, Hunan University of Chinese Medicine, Changsha, Hunan 410208, P.R. China
2. Hunan Engineering Technology Research Center for Bioactive Substance Discovery of Chinese Medicine, Changsha, Hunan 410208, P.R. China
3. Hunan Province Sino-US International Joint Research Center for Therapeutic Drugs of Senile Degenerative Diseases, Changsha, Hunan 410208, P.R. China