Sugars in wine as chaptalization solely in order to boost the alcohol content – chaptalization does not increase the "sweetness" of a wine. Glucose, along with fructose, is one of the primary sugars found in wine grapes. In wine, glucose tastes less sweet than fructose. It is a six-carbon sugar molecule derived from the breakdown of sucrose. At the beginning of the ripening stage there is usually more glucose than fructose present in the grape (as much as five times more) but the rapid development of fructose shifts the ratio to where at harvest there are generally equal amounts. Grapes that are over
Quinta classification of Port vineyards in the Douro Quinta classification of Port vineyards in the Douro The Quinta classification of Port vineyards in the Douro is a system that grades the "terroir" and quality potential of vineyards in the Douro wine region to produce grapes suitable for the production of Port wine. In Portuguese, a "quinta" is a wine producing estate, which can be a winery or a vineyard. While other wine classification systems may classify the winery (such as the 1855 Bordeaux classification), the Douro quinta classification is based upon the physical characteristics of the vineyard. The classification system is run by the "Instituto dos Vinhos do