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Yeast, most commonly S. cerevisiae, is used in baking as a leavening agent, converting the fermentable sugars present in dough into carbon dioxide. This causes the dough to expand or rise as gas forms pockets or bubbles. When the dough is baked, the yeast dies and the air pockets "set", giving the baked product a soft and spongy texture.
Saccharomyces cerevisiae (/ ˌ s ɛr ə ˈ v ɪ s i. iː /) (brewer's yeast or baker's yeast) is a species of yeast (single-celled fungal microorganisms). The species has been instrumental in winemaking, baking, and brewing since ancient times. It is believed to have been originally isolated from the skin of grapes.
Starch gelatinization begins at 105 °F (41 °C), [34] the yeast dies at 140 °F (60 °C), [35] and the baking is finished when the product reaches an internal temperature of 208–210 °F (98–99 °C). [21] Cooling: Once the bread is fully baked, it is removed to racks to cool. Bread is sliced once it has cooled to 95–105 °F (35–41 °C).
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.
When the yeast cells die, they release high quantities of a protease which snip protein strands, and in large die-offs result in soft, sticky dough, less baked volume, and a coarse crumb, [2] but in smaller die offs, increase dough extensibility and baked volume. [10] Different bread varieties will have different process requirements.
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The skins included in the fermentation of red wine provide some nutrients to the yeast. A byproduct of the energy created during fermentation is heat. which raises the temperature of the fermenting must as the yeast works. When temperatures near 104°F (40°C), activity slows and yeast starts to die. If temperatures stay high and the yeast ...
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