Resveratrol (3,5,4'-trihydroxystilbene) is a stilbenoid, a derivative of stilbene.
It exists as two geometric isomers: cis- (Z) and trans- (E), with the trans-isomer shown in the top image.
Resveratrol exists conjugated to glucose.

The trans- form can undergo photoisomerization to the cis- form when exposed to ultraviolet irradiation.

UV irradiation to cis-resveratrol induces further photochemical reaction, producing a fluorescent molecule named "Resveratrone".

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.
The trans isomer is also stabilized by the presence of transport proteins.
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.
Resveratrol (3,5,4'-trihydroxystilbene) is a stilbenoid, a derivative of stilbene. It exists as two geometric isomers: cis- (Z) and trans- (E), with the trans-isomer shown in the top image. Resveratrol exists conjugated to glucose.
The trans- form can undergo photoisomerization to the cis- form when exposed to ultraviolet irradiation.
UV irradiation to cis-resveratrol induces further photochemical reaction, producing a fluorescent molecule named "Resveratrone".
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. The trans isomer is also stabilized by the presence of transport proteins. 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.
Resveratrol