Metabolism of geraniol in grape berry mesocarp of Vitis vinifera L. cv. Scheurebe: demonstration of stereoselective reduction, E/Z-isomerization, oxidation and glycosylation

The metabolism of deuterium labeled geraniol 5 in grape mesocarp of Vitis vinifera L. cv. Scheurebe was studied by in vivo-feeding experiments. Stereoselective reduction to (S)-citronellol 9, stereoselective biosynthesis of the potent odorant cis-(2S,4R)-rose oxide 11 and E/Z-isomerization to nerol 7 could be demonstrated.