Phenolic content in wine - quercetin. Like other flavonoids, the concentration of flavonols in the grape berries increases as they are exposed to sunlight. Some viticulturalists will use measurement of flavonols such as quercetin as an indication of a vineyard's sun exposure and the effectiveness of canopy management techniques. Anthocyanins are phenolic compounds found throughout the plant kingdom, being frequently responsible for the blue to red colors found in flowers, fruits and leaves. In wine grapes, they develop during the stage of "veraison" when the skin of red wine grapes changes color from green to red to black. As the sugars in the grape
Mexican wine by clergy. The Santo Tomás Mission, founded in Baja California by Jesuit priests in 1791, reactivated larger scale production of wine in Mexico. In 1843, Dominican priests began growing grapes at the nearby Nuestra Señora de Guadalupe del Norte mission, located in what is now called Valle de Guadalupe. This valley is one of the few in the world, along with others such as the Napa Valley and the Rhone Valley, in which premium wine grapes can be grown. In the 1850s, as part of Mexico’s Reform War, many of the Church’s land holdings were taken by the state. Most