Determination of stilbenes (delta-viniferin, trans-astringin, trans-piceid, cis- and trans-resveratrol, epsilon-viniferin) in Brazilian wines.
Phenolics from grapes and wines can play a role against oxidation and development of atherosclerosis. Stilbenes have been shown to protect lipoproteins from oxidative damage and to have cancer chemopreventive activity. We describe a method for the direct determination of stilbenes in several red wines using high-performance liquid chromatography with UV detection. In a survey of 12 commercial wines from the south of Brazil (Rio Grande del Sul), levels of delta-viniferin are reported for the first time in different varieties of red wines. Brazilian red wine contains trans-astringin, trans-piceid, trans-resveratrol, cis-resveratrol (in high quantity: 5 times more than the trans form), epsilon-viniferin, and a compound isolated for the first time in wine, trans-delta-viniferin. Isolation and identification of delta-viniferin was achieved by NMR after extraction and fractionation of red wine phenolics. delta-Viniferin contributes, as well as cis-resveratrol and trans-piceid, to a significant proportion of stilbenes in wine dietary intake, particularly with Merlot varieties containing an average level of 10 mg/L for delta-viniferin, 15 mg/L for cis-resveratrol, and 13 mg/L for trans-piceid. The total stilbene intake from wine origin was estimated for the Brazilian population as 5.3 mg/day per person (on the basis of a regular wine consumption of 160 mL/day). delta-Viniferin can contribute to around 20% of total stilbenes in wine (average of 6.4 mg/L in red Brazilian wines). It would be important in the future to investigate the origins of the differences in wine stilbene levels in relation to the vine varieties, and the bioavailability of the newly extracted stilbene delta-viniferin in plasma after consumption of different types of wines.
Université de Bordeaux 2, Faculté des Sciences Pharmaceutiques, Groupe d'Etude des Substances Végétales à Activité Biologique, EA 3675, 146, rue Léo Saignat, 33076 Bordeaux Cedex, France.
Xavier
X
Vitrac
Aurélie
A
Bornet
Regina
R
Vanderlinde
Josep
J
Valls
Tristan
T
Richard
Jean-Claude
JC
Delaunay
Jean-Michel
JM
Mérillon
Pierre-Louis
PL
Teissédre
D001572:Benzofurans / Q000032:analysis; D001938:Brazil; D002851:Chromatography, High Pressure Liquid; D005960:Glucosides / Q000032:analysis; D009682:Magnetic Resonance Spectroscopy; D012118:Resorcinols / Q000032:analysis; D000077185:Resveratrol; D013267:Stilbenes / Q000032:analysis*; D014920:Wine / Q000032:analysis*
D001572:Benzofurans; D005960:Glucosides; D012118:Resorcinols; D013267:Stilbenes; C121481:astringin; C477734:delta-viniferin; C091891:epsilon-viniferin; D000077185:Resveratrol; C058229:polydatin