Quantitative Analysis of Flavonoids of Hylocereus undatus (Bawanghua)

Bawanghua, the flower of Hylocereus undatus, is an edible herb. Quercetin, kaempferol and isorhamnetin glycosides are the major components in Bawanghua. The major flavonoid glycosides in Bawanghua are too identical to be separated in preparative scale which hindered the using of those glycosides as references in routine quality control method. Quantification of the flavonoid aglycones hydrolyzed from their glycosides