What is the function of yeast? If the yeast is expired and the dough cannot rise, can we still use it?

Yeast belongs to the kingdom of fungi, family Saccharomyces, and genus Saccharomyces. It is widely distributed in nature and is a natural leavening agent. It is also a typical heterotrophic anaerobic microorganism. As we all know, yeast is indispensable when making dough in our daily life. Let's take a look at the role of yeast!

Contents of this article

1. The role of yeast

2. Can I still keep the dough if the yeast is expired and cannot rise?

3. How long can yeast dough be allowed to rise?

The role of yeast

The functions of yeast are:

First, make bread yeast to help the dough rise.

Second, it can be made into tea yeast to enhance the nutrition of food.

Third, it is made into beer yeast to help brew beer.

Third, it is made into yeast tablets to maintain body functions.

Yeast generally refers to the eukaryotic receptor cells commonly used in gene cloning experiments. It is a single-cell fungus that can be obtained through culture.

Yeast has the function of fermenting sugar into alcohol and carbon dioxide. It is a natural fermentation agent and a typical heterotrophic facultative anaerobic microorganism.

Yeast belongs to the kingdom of fungi, family Saccharomyces, and genus Saccharomyces. It is widely distributed in nature and generally grows in a slightly acidic, humid, sugary environment, such as air, soil, water, and in animals.

Can I still keep the dough if the yeast expires and it doesn't rise?

The dough that cannot rise due to yeast expiration can still be used if it has not deteriorated. The reason why the dough cannot rise due to yeast expiration is mainly related to the amount and temperature of the yeast. If the dough cannot rise, you can deal with it according to different situations. If the yeast activity is still poor and the dough cannot rise, you can make cakes instead to avoid waste.

Generally speaking, if the temperature is normal and the dough does not rise within the proofing time, you can use the method of adding yeast. Dissolve the yeast in water and pour it on the dough. After waiting for about 10 minutes, observe the dough. If a layer of foam floats on the surface of the dough, it means that the yeast is active and you can continue to wait for the dough to rise.

When making dough, in addition to yeast powder, you can add a little sugar or vinegar to help the dough rise. Sugar and vinegar can properly increase the activity of yeast, make the dough softer, increase the taste of the dough, and also have a certain flavor enhancement effect.

How long can yeast dough rise?

It is best not to leave the dough to rise for more than 3 hours, because over-leaving will make the dough too fluffy and difficult to shape. When using yeast to rise the dough, it is generally enough to leave it to rise for 30 minutes, but the specific fermentation time is related to the temperature. If it is in winter, the fermentation time needs to be longer.

When using yeast to make dough, the water temperature should not exceed 47°C, because yeast cells generally cannot grow at temperatures above 47°C.

It is best to place yeast dough in an environment with a temperature of 20-30℃, so that the fermentation effect is better.

Yeast can ferment sugar into alcohol and carbon dioxide. It can survive under both aerobic and anaerobic conditions and is a natural fermentation agent.