title: Antioxidant C-glycosyl flavones from the leaves of Sasa kurilensis var. gigantea.
abstract: C-glycosyl flavones, kurilensin A (1) and B (2), together with two known compounds, tricin-4'-O-beta-d-glucopyranoside (3) and tricin-5-O-beta-d-glucopyranoside (4), were isolated from hot-water extracts of the leaves of Sasa kurilensis. The structure of the compounds was determined by spectroscopic analyses including 1D, 2D NMR and MS. The absolute configuration of sugar moieties in 1 and 2 was determined by chiral HPLC analyses of the benzoyl derivatives of acid hydrolysis. Compounds 1 and 2 exhibited higher radical scavenging activity than ascorbic acid in the 1,1-diphenyl-2-pycrylhydrazyl (DPPH) assay system.
authors.affiliation: Department of Pharmacognosy and Chemistry of Natural Products, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Hasegawa
authors.forename: Ayumi
authors.initials: A
authors.lastname: Tanaka
authors.forename: Akiko
authors.initials: A
authors.lastname: Hosoda
authors.forename: Fumihide
authors.initials: F
authors.lastname: Takano
authors.forename: Tomihisa
authors.initials: T
authors.lastname: Ohta
mesh_terms: D000975:Antioxidants / Q000737:chemistry*; D001713:Biphenyl Compounds / Q000737:chemistry; D047309:Flavones / Q000737:chemistry*; D006834:Hydrazines / Q000737:chemistry; D015394:Molecular Structure; D010851:Picrates; D018515:Plant Leaves / Q000737:chemistry*; D031787:Sasa / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D001713:Biphenyl Compounds; D047309:Flavones; D006834:Hydrazines; D010851:Picrates; C004931:1,1-diphenyl-2-picrylhydrazyl