Fig. 4. Typical LC–MS chromatograms of flavonoids from C. paliurus leaves obtained by MAE. Peak A, quercetin-3-O-b-D-glucuronide; Peak B, kaempferol-3-O-b-Dglucuronide; Peak C, kaempferol-7-O-a-L-rhamnoside, Peak D, quercetin; and Peak E, kaempferol.