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Seeding
The seed yeast is a carefully maintained laboratory culture so as to avoid contamination by "wild" yeast present in the air. Yeast seeds are selected with care according to the type of yeast to be produced and the specific characteristics desired. All cultures are laboratory pure; all transfers are made with absolute sterility; all vessels are completely sterilized.
The "seed yeast" is placed in small flasks where it is allowed to grow. It is then transferred in a series of steps from these small flasks to tanks of about 1,000 gallons in volume. Now known as "stock yeast", it is separated from the alcohol generated by the fermentation and stored in refrigerated tanks for the subsequent fermentation cultivation.
Step# 3: Cultivation
Click here to learn how yeast is cultivated
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