title: LC-NMR, NMR, and LC-MS identification and LC-DAD quantification of flavonoids and ellagic acid derivatives in Drosera peltata.
abstract: The herb of Drosera peltata, commonly named the shield sundew, is used as an antitussive in phytotherapy, although the plants' composition has not been determined in detail so far. Hence, in this study, we present a validated, sensitive, reliable, and cheap narrow-bore LC-DAD method for the simultaneous quantification of flavonoids and ellagic acid derivatives in this herbal drug. In addition, the structures of 13 compounds have been elucidated by LC-MS, LC-NMR, and offline NMR experiments after isolation: herbacetin-3-O-glucoside (1), gossypitrin (2), ellagic acid (3), quercetin-7-O-glucoside (4), isoquercitrin (5), kaempferol-3-O-(6″-O-galloyl)-glucoside (6), herbacetin-7-O-glucoside (7), astragalin (8), gossypetin (9), herbacetin (10), quercetin (11), 3,3'-di-O-methyl ellagic acid (12), and kaempferol (13). Compounds 1, 2, 4, 5, 6, 7, and 10 have been identified in D. peltata for the first time, and compounds 1, 4, 6, 7, and 10 have not been detected in any Drosera species before.
authors.affiliation: Institute of Chemistry, Hohenheim University, Garbenstrasse 30, 70599 Stuttgart, Germany.
authors.forename: Christina
authors.initials: C
authors.lastname: Braunberger
authors.forename: Martin
authors.initials: M
authors.lastname: Zehl
authors.forename: Jürgen
authors.initials: J
authors.lastname: Conrad
authors.forename: Sonja
authors.initials: S
authors.lastname: Fischer
authors.forename: Hamid-Reza
authors.initials: HR
authors.lastname: Adhami
authors.forename: Uwe
authors.initials: U
authors.lastname: Beifuss
authors.forename: Liselotte
authors.initials: L
authors.lastname: Krenn
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D029787:Drosera / Q000737:chemistry*; D004610:Ellagic Acid / Q000032:analysis*; D005419:Flavonoids / Q000032:analysis*; D057230:Limit of Detection; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*
chemical_list: D005419:Flavonoids; D004610:Ellagic Acid
keywords: Drosera peltata; Ellagic acid derivatives; Flavonoids; LC–DAD; LC–MS; LC–NMR