Isolation and Characterization of Novel Stilbene Derivatives from Riesling Wine

Besides the already known stilbenes trans -resveratrol as well as isomeric piceids, seven novel stilbene derivatives have been isolated from a commercial Riesling wine. The newly identified compounds included the monostilbene 2,4,6-trihydroxyphenanthrene-2- O -glucoside, as well as two isomeric resveratrol-2- C -glucosides. In addition, four dimeric stilbenes, i.e., cis- and trans- ε-viniferin diglucoside as well as pallidol glucoside and pallidol diglucoside, have also been obtained for the first time from Riesling wine.