Chemical and Physical Properties
Resveratrol (3,5,4'-trihydroxystilbene) is a stilbenoid, a derivate of stilbene.
It exists as two geometric isomers: cis- (Z) and trans- (E), with the trans-isomer shown in the top image. The trans- and cis-resveratrol can be either free or bound to glucose. The trans- form can undergo isomerisation to the cis- form when exposed to ultraviolet irradiation. Trans-resveratrol in the powder form was found to be stable under "accelerated stability" conditions of 75% humidity and 40 °C in the presence of air. Resveratrol content also was stable in the skins of grapes and pomace taken after fermentation and stored for a long period. lH- and 13C-NMR data for the four most common forms of resveratrols are reported in literature.
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