Table 4.

Analysis of Quercetin 3-O-Glycosides in the Leaves and the Berry Skins (Exocarps) of Grapevines

Cultivar Organ/Tissue	Quercetin 3-O-glucoside + 3-O-galactoside (mg/g fresh weight)	Quercetin 3-O-glucuronide (mg/g fresh weight)
Pinot Noir
Leaves	3.242	9.724
Exocarp	0.418	0.367
Cabernet Sauvignon
Leaves	0.045	0.255
Exocarp	0.178	0.422
Shiraz
Exocarp	0.057	0.219
Dried fruits	0.029	0.030

Contents of quercetin 3-O-glycosides in grapevine leaves and berry skins were determined by LC-MS and HPLC. For experimental details, see Methods.