A Brewing Post: Yeasty Beer
Yesterday, on one of the brewing boards that I subscribe to, someone posted the following:
How to [sic] I get my brew to be less yeasty (no matter what the kits have a strong yeast after taste .. even though I have tryed [sic] to cover it with other flaverings [sic]This is how I responded:
Yeasty flavor can happen for one of two reasons. First, the most obvious and common reason is that there could actually be yeast in the brew. This could be because the yeast has not fully flocculated and settled out, or that the yeast that carbonated the beer, which will settle on the bottom of the bottle, has been stirred up. Is the beer cloudy when you pour it? Are you drinking it right out of the bottle? Try and pour the beer carefully out of the bottle and leave the yeast sediment behind.
The second reason that yeastiness can occur might be an actual fault in the beer. During fermentation, having the beer sit too long on the yeast cake (the large layer of yeast sediment that accumulates in the fermenter during fermentation), after fermentation has slowed, can cause the yeast can autolyze.
When it does this, the yeast cell ruptures and taints the beer. Sometimes, this is called "yeast taint." In slight forms, it will make the beer taste and smell yeasty. In extreme cases, it can smell and taste like burnt rubber.
One thing to note is that autolysis is somewhat rare, and is not guaranteed to happen. Sometimes, you hear stories of people letting beer sit on the cake for a year or more and not having issues. However, in some cases, it might happen after a month or so. You just never know. One thing is for sure, though. The longer it sits, the more the chances of autolysis.
To reduce the risk, you can rack to a secondary fermenter after the fermentation slows. In some cases, even racking to a tertiary can help, if you get a lot of yeast flocculation and settling in the secondary.
I hope this helps.














