Sunday, September 6, 2015

13. Fermentation



Grapes turning into wine is an example of fermentation. Fermentation is a cellular process that does not require oxygen. It is changing carbohydrates into alcohols, carbon dioxide or organic acids using bacteria or yeast. Because grape skin contains natural bacteria and yeast, it is fermented with its skin. After the grapes have been made into grape juice, if it is put at the right temperature, then the yeast turns the sugar in the grape juice into alcohol and carbon dioxide. That is the process of grape fermentation.

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