Total Flavonoids Determined by HPLC in Extracts of Gynura bicolor DC.
REN Bing-ru, Lü Han, CHEN Jian, LIANG Cheng-yuan, WU Ju-lan, LI Wei-lin*
FOOD SCIENCE . 2014, (12): 160 -164 .  DOI: 10.7506/spkx1002-6630-201412032