Optimization of extraction method and antioxidant activity of total flavonoids from stems and leaves of Fagopyrum dibotrys

• SUN Guang, 
• ZHANG Rong, 
• LIU Fengdan, 
• CHEN Guangji, 
• LI Shige, 
• SHANG Yishun, 
• SONG Li, 
• BAN Qian, 
• ZHONG Li, 
• LONG Zhongfu, 
• WANG Qian, 
• LI Xiaodong