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Malic and tartaric acid are the primary acids in wine grapes. The acids in wine are an important component in both winemaking and the finished product of wine. They are present in both grapes and wine, having direct influences on the color, balance and taste of the wine as well as the growth and vitality of yeast during fermentation and protecting the wine from bacteria.
Barbera is a red Italian wine grape variety that, as of 2000, was the third most-planted red grape variety in Italy (after Sangiovese and Montepulciano). It produces good yields and is known for deep color, full body, low tannins and high levels of acidity. [1]
In Canada, red wine dominates with a 52.3% share of total wine sales in 2004, although there are regional disparities, with Quebec favoring it even more. [13] In the United States, there is a balance between white wine, preferred by women, and red wine, favored by men. [8] Red wine is gaining market share in many countries.
Red wine will be richer in phenols abundant in the skin and seeds, such as anthocyanin, proanthocyanidins and flavonols, whereas the phenols in white wine will essentially originate from the pulp, and these will be the phenolic acids together with lower amounts of catechins and stilbenes. Red wines will also have the phenols found in white wines.
Esters: [2] Ethyl acetate is the most common ester in wine, being the product of the most common volatile organic acid — acetic acid, and the ethyl alcohol generated during the fermentation. Norisoprenoids, such as C13-norisoprenoids found in grape (Vitis vinifera) [8] or wine, [9] can be produced by fungal peroxidases [10] or glycosidases. [11]
At an odor detection threshold of 0.2 mg/L in white wines and 2.8 mg/L in red wines, it can be perceived as slightly buttery or "nutty" while at concentrations greater than 5 to 7 mg/L (5-7 ppm) can overwhelm other aroma notes in the wine. [7] [10] Diacetyl can be produced by the LAB through metabolism of sugar or of citric acid. [11]