The process of fermentation in winemaking turns grape juice into an alcoholic beverage. During fermentation, yeasts transform sugars present in the juice into ethanol and carbon dioxide (as a by-product). In winemaking, the temperature and speed of fermentation are important considerations as well as the levels of oxygen present in the must at the start of the fermentation. The risk of stuck fermentation and the development of several wine faults can also occur during this stage, which can last anywhere from 5 to 14 days for primary fermentation and potentially another 5 to 10 days for a secondary fermentation. Fermentation may be done in stainless steel tanks, which is common with many white wines like Riesling, in an open wooden vat, inside a wine barrel and inside the wine bottle itself as in the production of many sparkling wines.
>>>PUT SHARE BUTTONS HERE<<<
Fermentation in winemaking in the context of Wine
Wine is an alcoholic drink made from fermented grape juice. It is produced and consumed in many regions around the world, in a wide variety of styles which are influenced by different varieties of grapes, growing environments, viticulture methods, and production techniques.
Wine has been produced for thousands of years, the earliest evidence dating from c. 6000 BCE in present-day Georgia. Its popularity spread around the Mediterranean during Classical antiquity, and was sustained in Western Europe by winemaking monks and a secular trade for general drinking. New World wine was established by settler colonies from the 16th century onwards, and the wine trade increased dramatically up to the latter half of the 19th century, when European vineyards were largely destroyed by the invasive pest phylloxera. After the Second World War, the wine market improved dramatically as winemakers focused on quality and marketing to cater for a more discerning audience, and wine remains a popular drink in much of the world.
Fermentation in winemaking in the context of Sake
Sake, saké (Japanese: 酒, Hepburn: sake; English: IPA: /ˈsɑːki, ˈsækeɪ/ SAH-kee, SAK-ay), or saki, also referred to as Japanese rice wine, is an alcoholic beverage of Japanese origin made by fermenting rice that has been polished to remove the bran. Despite the name Japanese rice wine, sake, and indeed any East Asian rice wine (such as huangjiu and cheongju), is produced by a brewing process more akin to that of beer, where starch is converted into sugars that ferment into alcohol, whereas in wine, alcohol is produced by fermenting sugar that is naturally present in fruit, typically grapes. This process is called Multiple Parallel Fermentation.
Although similar, the brewing process for sake differs from the process for beer, in which the conversion from starch to sugar and then from sugar to alcohol occurs in two distinct steps. Like other rice wines, these conversions occur simultaneously when brewing sake. The typical alcohol content also differs between sake, wine, and beer; while most beer contains 3–9% ABV and wine generally contains 9–16% ABV, undiluted sake contains 18–20% ABV (although this is typically lowered somewhat by diluting with water prior to bottling).
Fermentation in winemaking in the context of White wine
White wine is a wine that is fermented without undergoing the process of maceration, which involves prolonged contact between the juice with the grape skins, seeds, and pulp. The colour can be straw-yellow, yellow-green, or yellow-gold. It is produced by the alcoholic fermentation of the non-coloured pulp of grapes, which may have a skin of any colour. White wine has existed for at least 4,000 years.
The wide variety of white wines comes from the large number of varieties, methods of winemaking, and ratios of residual sugar. White wine is mainly from "white" grapes, which are green or yellow in colour, such as the Chardonnay, Sauvignon blanc and Riesling. Some white wine is also made from grapes with coloured skin, provided that the obtained must is not stained. Pinot noir, for example, is commonly used to produce champagne.
Fermentation in winemaking in the context of Sparkling wines
Sparkling wine is a wine with significant levels of carbon dioxide in it, making it fizzy. While it is common to refer to this as champagne, European Union countries legally reserve that word for products exclusively produced in the Champagne region of France. Sparkling wine is usually either white or rosé, but there are examples of red sparkling wines such as the Italian Brachetto, Bonarda and Lambrusco, and the Australian sparkling Shiraz. The sweetness of sparkling wine can range from very dry brut styles to sweeter doux varieties (French for 'hard' and 'soft', respectively).
The sparkling quality of these wines comes from its carbon dioxide content and may be the result of natural fermentation, either in a bottle, as with the traditional method, in a large tank designed to withstand the pressures involved (as in the Charmat process), or as a result of simple carbon dioxide injection in some cheaper sparkling wines.