Abstract
Six flavonoids, diosmetin ( 1 ), apigenin ( 2 ), luteolin ( 3 ), chrysoeriol ( 4 ), apigenin-7- O -glucuronide ( 5 ) and acacetin ( 6 ), two caffeic acid sugar esters, verbascoside ( 7 ) and isoverbascoside ( 8 ), as well as one norsesquiterpene, blumenol A ( 9 ) were isolated or detected from the EtOAc and n -BuOH extract of the whole plants of Striga asiatica . Their structures were identified by 1 H & 13 C NMR, HR-LC-TOF-MS and co-injection with the reference standards. Among them, blumenol A ( 9 ) was firstly found from the Scrophulariaceae. Diosmetin ( 1 ) and isoverbascoside ( 8 ) were firstly reported from the genus Striga , while verbascoside ( 7 ) was reported from this plant for the first time. Based on our chemotaxonomic studies and the previous phytochemical studies on Scrophulariaceae, Striga could be tentatively treated as a member of the family Scrophulariaceae instead of Orobanchaceae. ► Nine compounds were isolated or detected from the extract of Striga asiatica . ► Blumenol A was firstly found from the Scrophulariaceae. ► Diosmetin, isoverbascoside were firstly reported from genus Striga . ► Striga should be treated as a member in Scrophulariaceae based on chemotaxonomic.
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