Enzymatic-ultrasonic assisted extraction of total flavonoids from Shaanxi Polygonatum sibiricum and in vitro evaluation of their anti-oxidant and anti-A549 proliferation activities 
GUO Kai-li, LIU Ji-ping, ZHAO Chong-bo, SHI Yong-heng, WANG Bin, QUAN Li-na, GUO Xiao-fang, ZHU Xing-mei
NATURAL PRODUCT RESEARCH AND DEVELOPMENT . 2022, (4): 630 -638 .  DOI: 10.16333/j.1001-6880.2022.4.011