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Active Dry Yeast

A dehydrated yeast culture that is the most convenient form of yeast for home winemakers to work with. Active dry yeast (ADY) cultures are prepared by extruding 70% moisture compressed yeast through a perforated plate into a spaghetti-like form, about the diameter of a 0.036 inch pencil lead, into a drier with a screen bottom that has a upward flow of air that keeps the particles of yeast suspended in a fluid-like bed. The incoming air is controlled for volume, temperature and relative humidity. The drying from the original 70% moisture down to 4-7% occurs in less than 30 minutes. There are typically over 150 billion cells in a 5-gram sachet of ADY. The ADY should be rehydrated in a starter solution (see Yeast Starter) before "pitching," both to ensure the culture is still good and to get a vigorous start.

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