Sugars in wine The technique allows for a better extraction of wine polysaccharides. Sugars in wine Sugars in wine are at the heart of what makes winemaking possible. During the process of fermentation, sugars from wine grapes are broken down and converted by yeast into alcohol (ethanol) and carbon dioxide. Grapes accumulate sugars as they grow on the grapevine through the translocation of sucrose molecules that are produced by photosynthesis from the leaves. During ripening the sucrose molecules are hydrolyzed (separated) by the enzyme invertase into glucose and fructose. By the time of harvest, between 15 and 25% of the grape will be
History of the wine press they provide solid evidence of wine making, they don't necessarily provide evidence of how the wine was made and if the modern concept of pressing (i.e. extracting juice from the skins and separating it from the skins and seeds) was used. Winemaking in ancient Egypt probably used people's feet for crushing and pressing the grapes, but tomb paintings excavated at Thebes showed that the ancient Egyptians developed some innovations to their wine presses-such as the use of long bars hanging over the treading basins and straps that the workers could hold onto while treading. Hieroglyph and paintings also showed the