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Fermented: Wine, cider and perry are produced by similar fermentation of natural sugar in apples and pears, respectively; and other fruit wines are produced from the fermentation of the sugars in any other kinds of fruit. Liquors: Brandy and eaux de vie (e.g. slivovitz) are produced by distillation of these fruit-fermented beverages.
Grapes being trodden to extract the juice and made into wine in storage jars. Tomb of Nakht, 18th dynasty, Thebes, Ancient Egypt. Sourdough starter. In food processing, fermentation is the conversion of carbohydrates to alcohol or organic acids using microorganisms—yeasts or bacteria—without an oxidizing agent being used in the reaction.
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The primary role of yeast is to convert the sugars present (namely glucose) in the grape must into alcohol.The yeast accomplishes this by utilizing glucose through a series of metabolic pathways that, in the presence of oxygen, produces not only large amounts of energy for the cell but also many different intermediates that the cell needs to function.
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Simple syrup (also known as sugar syrup, or bar syrup) is a basic sugar-and-water syrup. It is used by bartenders as a sweetener to make cocktails, and as a yeast feeding agent in ethanol fermentation. The ratio of sugar to water is 1:1 by volume for normal simple syrup, but can get up to 2:1 for rich simple syrup. [6]
Women brewers dominated alcohol production on every occupied continent [1] [2] until commercialization and industrialization of brewing occurred. [3] The tradition of brewing being in the domain of women stemmed from the fact that brewing was a by-product of gathering, [1] and often considered a part of baking. [2]
Depending on the time spent fermenting (always balanced against the risk of discovery by officers), the sugar content, and the quality of the ingredients and preparation, pruno's alcohol content by volume can range from as low as 2% (equivalent to a very weak beer) to as high as 14% (equivalent to a strong wine).