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Yeast flocculation typically refers to the reversible clumping together (flocculation) of brewing yeast once the sugar in a wort has been fermented into beer. In the case of "top-fermenting" ale yeast (Saccharomyces cerevisiae), the yeast creates a krausen, or barm on the top of the liquid, unlike "bottom-fermenting" lager yeast (Saccharomyces pastorianus) where the yeast falls to the bottom ...
In the brewing industry flocculation has a different meaning. It is a very important process in fermentation during the production of beer where cells form macroscopic flocs. These flocs cause the yeast to sediment or rise to the top of a fermentation at the end of the fermentation.
Flocculation is the tendency for the yeast to conglomerate into large masses at the top and bottom of the fermentation tank at the end of the fermentation process. This selective trait in the yeast came about as the majority of the yeast that gets repurposed is that which aggregates and gets easily removed.
Saccharomyces pastorianus is a yeast used industrially for the production of lager beer, and was named in honour of Louis Pasteur by the German Max Reess in 1870. [1] This yeast's complicated genome appears to be the result of hybridisation between two pure species in the Saccharomyces species complex, a factor that led to difficulty in establishing a proper taxonomy of the species.
The yeast in these beers tends to settle to the bottom of the storage tank naturally, so the sediment from these beers can often be filtered without using isinglass. [ citation needed ] However, some breweries still use isinglass finings for non-cask beers, especially when attempting to repair bad batches.
Brewers generally refer to this apparent attenuation when using the word without qualification, [5] although the measurement of real attenuation — the actual percentage of sugar consumed by the yeast — is an important indicator of yeast health and for producing certain styles of beer. A beer which does not attenuate to the expected level in ...
1: Properly served, there should be no significant quantities of this yeast present in the beer as it is drunk. During the conditioning process, finings help to gather the yeast into clumps ("flocculation") which sink into the belly of the cask below the tap. Only if the cask is shaken, tilted too far, or served too early will the yeast find ...
Yeast flocculation#Process; References This page was last edited on 30 May 2024, at 18:53 (UTC). Text is available under the Creative Commons ...