1. School of Pharmacy , Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Yantai University , Yantai , P. R. China
2. School of Pharmacy , The Key Laboratory of Prescription Effect and Clinical Evaluation of State Administration of Traditional Chinese Medicine of China, Binzhou Medical University , Yantai , 264003 , P. R. China
3. Shandong Wendeng Jizhen American Ginseng Industry Co., Ltd. , Shandong , 264400 , P. R. China
4. Department of Organic Chemistry, School of Pharmacy , Naval Medical University , Shanghai , 200433 , P. R. China
5. Department of Lab Teaching, School of Pharmacy , Naval Medical University , Shanghai , 200433 , P. R. China