Search results
Results from the WOW.Com Content Network
The natural occurrence of fermentation means it was probably first observed long ago by humans. [3] The earliest uses of the word "fermentation" in relation to winemaking was in reference to the apparent "boiling" within the must that came from the anaerobic reaction of the yeast to the sugars in the grape juice and the release of carbon dioxide.
Grape-treading or grape-stomping is part of the method of maceration used in traditional wine-making. [ 1 ] [ 2 ] [ 3 ] Rather than being crushed in a wine press or by another mechanized method, grapes are repeatedly trampled in vats by barefoot participants to release their juices and begin fermentation .
The chemistry of wine and its resultant quality depend on achieving a balance between three aspects of the berries used to make the wine: their sugar content, acidity and the presence of secondary compounds. Vines store sugar in grapes through photosynthesis, and acids break down as grapes ripen. Secondary compounds are also stored in the ...
After the harvest, the grapes are taken into a winery and prepared for primary ferment; at this stage red wine making diverges from white wine making. Red wine is made from the must (pulp, including the juice) of red or black grapes and fermentation occurs together with the grape skins, which impart color, flavor and tannins to the wine through ...
Vine-Glo was a grape concentrate brick product sold in the United States during Prohibition by Fruit Industries Ltd, a front for the California Vineyardist Association (CVA), from 1929. It was sold as a grape concentrate to make grape juice from but it apophatically included a warning with instructions on how to make wine from it. [1]
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.
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, fungal pectolytic enzymes are often added to white must to break up pectins, decrease the viscosity of the juice, and speed up settling.
Grape stomping at the Colorado Mountain Winefest in Grand Junction, Colorado, United States First developed in the Middle Ages, basket presses have a long history of use in winemaking. The earliest wine press was likely the human foot or hand, crushing and squeezing grapes into a bag or container where the contents would ferment.