title: Saponins and flavonoids of Allium triquetrum.
abstract: A phytochemical investigation of the flowers and bulbs of Allium triquetrum has been undertaken, leading to the isolation of five new furostanol saponins, triquetrosides A1/A2 (1a/1b), B (3), and C1/C2 (4a/4b), from the flowers, along with ascalonisides A1/A2 (6a/6b). The 22-O-methyl derivatives of triquetrosides A1/A2 (2a and 2b) and C1/C2 (5a and 5b) were also isolated, but they are considered extraction artifacts. Large amounts of seven kaempferol glycosides, of which one (7) has a new structure, were also isolated from both flowers and bulbs. The structures of the new compounds were determined by spectral and chemical methods.
authors.affiliation: Dipartimento di Chimica delle Sostanze Naturali, Università di Napoli Federico II, Via D. Montesano 49, I-80131 Napoli, Italy.
authors.forename: Gabriella
authors.initials: G
authors.lastname: Corea
authors.forename: Ernesto
authors.initials: E
authors.lastname: Fattorusso
authors.forename: Virginia
authors.initials: V
authors.lastname: Lanzotti
mesh_terms: D000490:Allium / Q000737:chemistry*; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D035264:Flowers / Q000737:chemistry; D007558:Italy; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification*; D013237:Stereoisomerism
chemical_list: D005419:Flavonoids; D012503:Saponins