title: Flavonoids from Jovibarba globifera (Crassulaceae) rosette leaves and their antioxidant activity.
abstract: Seven flavonoids new for the genus Jovibarba, kaempferol 1, kaempferol 3-O-galactopyranosyl-(1 → 2)-O-α-L-rhamnopyranoside 2, kaempferol 3-O-β-D-glucoside 3, kaempferol 3-O-α-L-rhamnopyranosyl-7-O-α-D-glucofuranosyl-(1 → 2)-O-α-L-rhamnopyranoside 4, kaempferol 3-O-β-D-glucopyranoside-7-O-α-L-rhamnopyranoside 5, kaempferol 3,7,4'-O-trimethyl ether 6 and quercetin 7, were isolated from fresh and dried leaves of J.ovibarba globifera subsp. globifera. The structures of these compounds were established by analysis of their spectroscopic ((1)H and (13)C NMR) and spectrometric (MS) data, as well as by comparison of these with those reported in the literature. All of the flavonoids are reported for the first time from the investigated taxon. In addition the antioxidant activities in DPPH test of selected compounds were evaluated.
authors.affiliation: a Department of Pharmaceutical Botany , Medical University of Lublin , Chodźki 1 St, 20-093 Lublin , Poland.
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Szewczyk
authors.forename: Tadeusz
authors.initials: T
authors.lastname: Krzaczek
authors.forename: Tomasz
authors.initials: T
authors.lastname: Łopatyński
authors.forename: Urszula
authors.initials: U
authors.lastname: Gawlik-Dziki
authors.forename: Christian
authors.initials: C
authors.lastname: Zidorn
mesh_terms: D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D001713:Biphenyl Compounds / Q000494:pharmacology; D029627:Crassulaceae / Q000737:chemistry*; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D044949:Kaempferols / Q000737:chemistry / Q000302:isolation & purification; D015394:Molecular Structure; D010851:Picrates / Q000494:pharmacology; D018515:Plant Leaves / Q000737:chemistry
chemical_list: D000975:Antioxidants; D001713:Biphenyl Compounds; D005419:Flavonoids; D044949:Kaempferols; D010851:Picrates; C006552:kaempferol; C004931:1,1-diphenyl-2-picrylhydrazyl
keywords: Crassulaceae; Jovibarba globifera; Jovibarba sobolifera; Sempervivum; antioxidant activity; flavonoids