Flavonol tetraglycosides from fruits of Styphnolobium japonicum (Leguminosae) and the authentication of Fructus Sophorae and Flos Sophorae

Analysis of fruit flavonoids of Styphnolobium japonicum revealed two flavonol glycosides (a triglycoside 5 and a tetraglycoside 11) and two further tetraglycosides (6 and 7) not previously reported from this species, of which 6 was the major flavonoid in mature seeds. Flavonoid analysis permitted the authentication of Fructus Sophorae and Flos Sophorae.