Delta-Viniferin (original) (raw)

δ-Viniferin is a resveratrol dehydrodimer. It is an isomer of epsilon-viniferin. It can be isolated from stressed grapevine (Vitis vinifera) leaves. It is also found in plant cell cultures and wine. It can also be found in Rheum maximowiczii. It is a grapevine phytoalexin following stresses like fungal infection (by Plasmopara viticola, the agent of downy mildew), UV light irradiation or ozone treatment. Botryosphaeria obtusa, a pathogen responsible for the black dead arm disease of grapevine, has also been shown to be able to oxidise wood δ-resveratrol into delta-viniferin.