Q&A for How to Grow Yeast

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How does yeast grow?

Community Answer

It goes though mitosis, like all living organisms do. Interphase is when the cell grows and replicates its DNA, then goes through the 4 stages of mitosis: Prophase, Metaphase, Anaphase, and Telophase. At the end one cell (mother cell) has divided into two cells (daughter cells), each having the same contents that the mother cell possessed. Each cell then divides into two more cells, and so on.

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Question

Can I use self-rising flour to grow yeast?

Community Answer

Self-rising flour is basically just a mixture of baking powder (sometimes salt) and flour. The baking powder and salt might kill the yeast, so I would not recommend it.

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Question

Can I freeze active yeast?

Community Answer

You really shouldn't. Active yeast cells have water in them. When you freeze water, it forms crystals which expand and that will kill the yeast cells.

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Question

How can I convert my yeast growth to active dry granulated yeast?

Community Answer

You can't do that unless you have extensive laboratory/factory equipment at home. Homemade yeast will always stay "wet," and attempting to dry the culture at home will most likely result in the yeast dying.

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Question

What makes yeast grow?

Community Answer

Usually optimal environmental settings will help with the growth of yeast; for example, light levels, temperature, and humidity all play a part in the growth of yeast. If you're referring to the physical mechanism of growth, yeast grows by feeding on sugars.

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Question

What do I do if the jar is full?

Community Answer

Take out a portion and keep the mixture refrigerated in order to slow down growth or make the yeast dormant. Do not freeze the mixture.

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Question

Can I use this method to cultivate certain strains of yeast?

Sciencesid

Community Answer

Yes, as long as you make sure there are no contaminations, and you use bleached flour for food so that the unnaturally introduced strain does not get crowded out.

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Question

In brewing, different strains of yeast produce different levels of ABV. How can I grow a strain specifically for higher ABV levels?

Jeff Robinson

Community Answer

Certain yeasts can tolerate higher levels of alcohol, which is their byproduct of feeding (eating the sugars supplied by the malt/wort). Different yeasts don’t produce more alcohol or less, but can survive in higher alcohol environments. So basically to make higher ABV, you need to give the yeast more sugar with a yeast strain that can tolerate the higher levels of alcohol. I know my local wine making shop has kits with this higher tolerant yeast along with instructions to brew higher ABV beverage (not using a still).

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