Main Page | See live article | Alphabetical index Brewing yeasts are yeasts used in the brewing Process and which have certain properties, including: The ability to convert certain sugars to alcohol Reduce diacetyl thereby avoiding 'butterscotch' flavours in the beer These fall into two main categories: Saccharomyces carlsbergensis Saccharmoyces cerevisiae To ensure purity of strain , a 'clean' sample of the yeast is stored in a laboratory environment at refridgerated temperature. After a certain number of fermentation cycles , a full scale propagation is produced from this laboratory sample. Typically, it is grown up in about three or four stages using sterile Brewing wort and oxygen. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.