title: Free-radical scavenging properties and reducing power of grape cane extracts from 11 selected grape cultivars widely grown in China.
abstract: Total phenolic contents (TPC), total flavonoid contents (TFC), related antioxidative and antiradical capabilities of grape cane extracts from 11 varieties (five V. vinifera cultivars and six Chinese wild grapes) widely grown in China were evaluated. Antioxidant properties were determined as DPPH and ABTS radical-scavenging abilities, superoxide anion and hydroxyl radical and hydrogen peroxide scavenging assays, as well as reducing power. Phenolic profiles of the extracts were characterized by using high-performance liquid chromatography (HPLC) techniques. All extracts exhibited strong antioxidant and effective free radical inhibition activities (EC(50) values), which generally correlated negatively with TPC (r = -0.804 to -0.918) and TFC (r = -0.749 to -0.888). In comparison with gallic acid, Trolox and tert-butylhydroquinone (positive controls), most grape cane extracts showed more efficient scavenging effects toward different reactive oxygen species. HPLC analysis revealed the presence of (+)-catechin, (-)-epicatechin, and trans-resveratrol as major phenolic components in the extracts. These results suggest that grape cane extracts may serve as a potential source of natural antioxidant for food and pharmaceutical application.
authors.affiliation: College of Enology, Northwest A&F University, Yangling, Shaanxi 712100, China.
authors.forename: Ang
authors.initials: A
authors.lastname: Zhang
authors.forename: Yulin
authors.initials: Y
authors.lastname: Fang
authors.forename: Hua
authors.initials: H
authors.lastname: Wang
authors.forename: Hua
authors.initials: H
authors.lastname: Li
authors.forename: Zhenwen
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D000975:Antioxidants / Q000378:metabolism; D052160:Benzothiazoles / Q000378:metabolism; D001713:Biphenyl Compounds / Q000378:metabolism; D002681:China; D005419:Flavonoids / Q000032:analysis; D016166:Free Radical Scavengers / Q000494:pharmacology*; D010084:Oxidation-Reduction / Q000187:drug effects; D010636:Phenols / Q000032:analysis; D010851:Picrates / Q000378:metabolism; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D017382:Reactive Oxygen Species / Q000378:metabolism; D019163:Reducing Agents / Q000494:pharmacology*; D013451:Sulfonic Acids / Q000378:metabolism; D027843:Vitis / Q000737:chemistry* / Q000187:drug effects / Q000254:growth & development*
chemical_list: D000975:Antioxidants; D052160:Benzothiazoles; D001713:Biphenyl Compounds; D005419:Flavonoids; D016166:Free Radical Scavengers; D010636:Phenols; D010851:Picrates; D010936:Plant Extracts; D017382:Reactive Oxygen Species; D019163:Reducing Agents; D013451:Sulfonic Acids; C002502:2,2'-azino-di-(3-ethylbenzothiazoline)-6-sulfonic acid; C004931:1,1-diphenyl-2-picrylhydrazyl