title: New phenylpropanoid esters of sucrose from Polygonum hydropiper and their antioxidant activity.
abstract: By various chromatographic methods, two new phenylpropanoid esters of sucrose named hidropiperosides A (1) and B (2), and three known compounds as vanicosides A (3), B (4), and E (5) were isolated from the methanolic extract of the whole plant of Polygonum hydropiper L. (Polygonaceae). Their structures were elucidated by extensive spectroscopic methods including 1D-and 2D-NMR experiments, as well as ESI-MS analysis. All the isolated compounds were tested for their antioxidant activity in the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay system. Among them, compounds 2 and 3 showed significant antioxidant activity with their SC(50) values of 23.4 and 26.7 microg/mL, respectively.
authors.affiliation: Institute of Natural Products Chemistry, Vietnamese Academy of Science and Technology, 18 Hoang Quoc Viet, Nghiado, Caugiay, Hanoi, Vietnam.
authors.forename: Phan Van
authors.initials: PV
authors.lastname: Kiem
authors.forename: Nguyen Xuan
authors.initials: NX
authors.lastname: Nhiem
authors.forename: Nguyen Xuan
authors.initials: NX
authors.lastname: Cuong
authors.forename: Tran Quynh
authors.initials: TQ
authors.lastname: Hoa
authors.forename: Hoang Thanh
authors.initials: HT
authors.lastname: Huong
authors.forename: Le Mai
authors.initials: le M
authors.lastname: Huong
authors.forename: Chau Van
authors.initials: CV
authors.lastname: Minh
authors.forename: Young Ho
authors.initials: YH
authors.lastname: Kim
mesh_terms: D000975:Antioxidants / Q000737:chemistry / Q000494:pharmacology*; D001713:Biphenyl Compounds; D002855:Chromatography, Thin Layer; D003373:Coumaric Acids / Q000302:isolation & purification / Q000494:pharmacology*; D004187:Disaccharides / Q000302:isolation & purification / Q000494:pharmacology*; D016166:Free Radical Scavengers / Q000302:isolation & purification / Q000494:pharmacology; D006868:Hydrolysis; D009682:Magnetic Resonance Spectroscopy; D010851:Picrates / Q000737:chemistry; D010936:Plant Extracts / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D028502:Polygonum / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization; D013055:Spectrophotometry, Infrared; D013395:Sucrose / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D001713:Biphenyl Compounds; D003373:Coumaric Acids; D004187:Disaccharides; D016166:Free Radical Scavengers; D010851:Picrates; D010936:Plant Extracts; C534005:hidropiperoside B; D013395:Sucrose; C004931:1,1-diphenyl-2-picrylhydrazyl