To produce the alcohol in beer, you use yeast, which must respire anaerobically.
1) Barley grains are allowed to germinate. Their starch is broken down into sugars using enzymes.
2) The grains are dried in a kiln. (malting)
3) The malted grain is mashed up with water to produce a sugary solution.
4) The solution is sieved to remove the pieces of grain.
5) Hops are added to the mixture to give beer its flavour.
6) Yeast is added and the beer is kept covered so that the yeast respires anaerobically and produces ethanol from the sugar.
-- When making wine, the yeast uses the natural sugars in the grapes.
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