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Institute of Anatomy, University of Milan, Italy.
The antiaggregating effect of the phytoalexin resveratrol (3,4,5-trihydroxystilbene), alone or associated with red wine, and polyphenol have been evaluated in vitro at different concentrations on platelet-rich plasma from healthy volunteers. Resveratrol at the concentration of 3.56 micrograms/l was able to lower platelet aggregation by 50.3% +/- 1.83. Red wine containing 1.2 mg/l of natural trans-resveratrol and 3.6 milligrams of polyphenols diluted 1000-fold (final resveratrol concentration: 1.2 micrograms/l) inhibited platelet aggregation by 41.9% +/- 2.11. By adding resveratrol to the wine up to a concentration of 1.2 micrograms/l, inhibition was raised to 78.5% +/- 4.70. These results suggest that the antiaggregating activity of resveratrol is related to its concentration in wine.
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