title: Hopeaphenol: the first resveratrol tetramer in wines from North Africa.
abstract: Grapes and wines are now known to constitute a rich source of phenolics such as stilbenes and flavonoids. These compounds have been shown to have cancer chemopreventive activity and potential beneficial effects on cardiovascular diseases thanks to their antioxidant and antiplatelet properties. However, because little is known about African wines and their phenolic compositions, we investigated wine samples from North Africa. A three-step method was used for the fractionation of the Merlot variety wine: column chromatography followed by centrifugal partition chromatography and reversed-phase semipreparative high-performance liquid chromatography (HPLC). Six polyphenolic compounds of the Merlot variety (from Algeria) were isolated and identified by NMR spectroscopy, five of which are known (trans-resveratrol, trans-piceid, trans-epsilon-viniferin, pallidol, and astilbin) and one that is reported for the first time in wine, (+)-hopeaphenol, a stilbene tetramer. Furthermore, these molecules were quantified in 10 commercial wines from North Africa by means of an analytical HPLC system coupled with diode array detection. Differences in concentrations were found ranging in mg/L from 4.6 to 45 (trans-piceid), 0.66 to 3.45 (trans-resveratrol), 0.2 to 1.2 (trans-epsilon-viniferin), 0.2 to 9.2 (pallidol), 0.3 to 3.8 (hopeaphenol), and 10.8 to 24.22 (astilbin). Such a high level of pallidol and astilbin has never been recorded in wine. North African wines may contribute to a significant proportion of dietary intake of stilbene and astilbin, which may have health benefits.
authors.affiliation: Laboratoire de Chimie Appliquée, Université du 08 mai 1945, Guelma 24000, Algérie, France.
authors.forename: Habiba Amira
authors.initials: HA
authors.lastname: Guebailia
authors.forename: Kleopatra
authors.initials: K
authors.lastname: Chira
authors.forename: Tristan
authors.initials: T
authors.lastname: Richard
authors.forename: Teguiche
authors.initials: T
authors.lastname: Mabrouk
authors.forename: Aurélie
authors.initials: A
authors.lastname: Furiga
authors.forename: Xavier
authors.initials: X
authors.lastname: Vitrac
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Monti
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Delaunay
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Mérillon
mesh_terms: D000352:Africa, Northern; D000462:Algeria; D002851:Chromatography, High Pressure Liquid; D005419:Flavonoids / Q000032:analysis / Q000302:isolation & purification; D044948:Flavonols / Q000032:analysis; D009682:Magnetic Resonance Spectroscopy; D010636:Phenols / Q000032:analysis / Q000302:isolation & purification; D059808:Polyphenols; D000077185:Resveratrol; D013267:Stilbenes / Q000032:analysis*; D014920:Wine / Q000032:analysis*
chemical_list: D005419:Flavonoids; D044948:Flavonols; D010636:Phenols; D059808:Polyphenols; D013267:Stilbenes; C518233:hopeaphenol; C099069:astilbin; D000077185:Resveratrol