At what temperature range does yeast die?

At what temperature range does yeast die?

• A. 100F-110F
• B. 120F-130F
• C. 130F-140F
• D. 140F-150F

Answer: (C)

The correct temperature range at which yeast dies is between 130F and 140F. Yeast is a living organism, and it is sensitive to temperature changes. When the yeast is exposed to temperatures within this range, the heat effectively kills the cells, which prevents them from fermenting the dough and producing carbon dioxide gas.

At temperatures below this range, yeast remains active and can ferment effectively; however, as temperatures approach or exceed 130F, the proteins in the yeast cells begin to denature, resulting in loss of function and ultimately cell death. Maintaining proper fermentation temperatures is crucial in baking, as it influences not only the yeast's activity but also the texture and flavor of the final baked product.

Understanding the temperature tolerance of yeast is essential for bakers to achieve the desired rise in bread and other yeast-leavened products.