Good Microbes In Food

Yeast

Yeasts have two main uses in food production:

baking and making alcoholic beverages

Baked Goods like bread rise because of the presence of yeast as a raising or leavening,agent.

This forms bubbles within the dough,causing it expand. Other ingredients in the mixture

have an effect on the speed of the fermentation- sugar and eggs speed it up;fats and salt

slow it down.

Several different yeasts are used in brewing beer,where they ferment the sugars present in malted barley to produce alcohol. They ferment more of the sugars in the mixture then top-

fermenting yeast,giving a cleaner taste.

The alcohol in wine is formed by the fermentation of the sugars in grape juice,with carbon dioxide as a byproduct. Yeast is naturally present on grapeskins and this alone can be sufficient for the fermentation of sugars to alcohol to occur