Fig. 1

HPLC chromatogram of each plant. a Loganin is the marker compound of Cornus officinalis Sieb. et Zucc. b Betain is the marker compound of Lycium chinense Miller. c Ellagic acid is the marker compound of Rubus coreanus Miquel. d Hyperoside is the marker compound of Cuscuta chinensis Lam. e Schizandrin is the marker compound of Schisandra chinensis Baillon