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Zinfandel (also known as Primitivo) is a variety of black-skinned wine grape.The variety is grown in over 10 percent of California vineyards. [1] DNA analysis has revealed that it is genetically equivalent to the Croatian grapes Crljenak Kaštelanski and Tribidrag, as well as to the Primitivo variety traditionally grown in Apulia, Italy, where it was introduced in the 18th century, and ...
In 1997, Zinfandel Advocates and Producers partnered with the UC Davis department of enology to initiate the Zinfandel Heritage Vineyard Project.This project had four key goals: 1) Preservation of historical Zinfandel vines, 2) Identification of different clonal selections of Zinfandel, 3) Propagation of a variety of “clean” Zinfandel selections and 4) Experimentation of how the different ...
A bottle of California-made White Zinfandel. White Zinfandel is a type of rosé wine made from red Zinfandel grapes that falls between the categories of off-dry and sweet.As it is not made from white grapes, it has a blush color, derived from grapes which are typically used to produce a full-bodied and spicy red wine called Zinfandel.
Zinfandel is typically made into a robust red wine, but in the USA a semi-sweet rosé wine called White Zinfandel has six times the sales of the red wine. Zinfandel has such high sugar levels that in the USA the grapes were originally grown for eating as fruit, and this sugar can be fermented into high levels of alcohol, sometimes 15% or more.
Large pectin molecules can affect the amount of juice yielded at pressing, ease of filtration and clarification, and extraction of tannins. Grapes contain natural pectolytic enzymes responsible for softening the grape berries during ripening, but these are not active under wine-making conditions (due to pH level, SO 2, and alcohol.) Therefore ...
In some grape species, clusters ripen collectively, which allows them to be harvested together. [13] For others, grapes may ripen individually within a cluster. Each grape berry contains a pedicel which attaches to the rachis. The main function of the rachis is to allow the grapes to receive their water and nutrients. [12]
Wines that could have potentially problematic fermentation (such as high sugar level late harvest or botryized wines) may have more yeast added. [5] Similarly, re-hydration procedures will also vary depending on the manufacturer and winery. Yeast is often inoculated in a volume of water or grape must that is 5–10 times the weight of the dry ...
At time of harvest, there is usually an equal amount of glucose and fructose molecules in the grape; however, as the grape overripens the level of fructose will become higher. In wine, fructose can taste nearly twice as sweet as glucose and is a key component in the creation of sweet dessert wines. During fermentation, glucose is consumed first ...