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Home Brew Forums > Home Brewing Beer > General Techniques > Autolysis: fact or fiction
View Poll Results: Have you experienced yeast autolysis?
No, never had it happen to me 143 81.71%
Yes, with 2 to 3 weeks in the primary 1 0.57%
Yes, with 4 - 5 weeks in the primary 1 0.57%
Yes, but with 6 weeks or more in the primary 11 6.29%
WTF is autolysis??? 19 10.86%
Voters: 175. You may not vote on this poll

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Old 05-22-2007, 11:49 PM   #1
FlyGuy
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Default Autolysis: fact or fiction

OK, yes yeast autolysis is actually a potential concern (not fiction). But is it a substantial concern? I have been gradually moving away from secondaries and leaving my beer longer and longer in the primary. With up to 6 weeks in the primary, I still haven't perceived anything resembling autolysis. The more I investigate the topic, the more it seems that autolysis is awfully hard to produce.

So, the question is 'Have you experienced autolysis, and if so, how long did you leave your beer in the primary to achieve it?' Comments on the type of beer, yeast, fermentation conditions, etc. would be helpful if you have experienced it. If it was a one-time or rare event, perhaps that could be mentioned too. Thanks.

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Old 05-23-2007, 12:29 AM   #2
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Nope, never had a beer on the yeast long enough.

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Old 05-23-2007, 01:19 AM   #3
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I've had it when I failed to clean out a fermenter. Took about two months, in the summer.

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Old 05-23-2007, 01:50 AM   #4
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Never had a problem with autolysis, but I have left beers in the primary for about 6 weeks several times.

-a.

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Old 05-23-2007, 02:39 AM   #5
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Never had a problem. The longest I've left a beer in primary was 31 days, and it was fine. Of course, it was 1.090 OG, so that may have helped.

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Old 05-23-2007, 02:45 AM   #6
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I leave 1.090+ beers in primary for 6-8 weeks on occasion and never have any problems with it.

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Old 05-23-2007, 03:48 AM   #7
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My last ale (a Highland Gaelic clone) sat in primary 63 days at around 65-70F with no problems. Only one data point, though.

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Old 06-25-2009, 08:24 AM   #8
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I just racked a beer to secondary, 1.072 og brewed on 1/21 (today is 6/24). I don't taste anything bad. As far as I'm concerned it's a warm sweet stout, as it should be.

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Old 06-25-2009, 10:48 AM   #9
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My doppelbock sat in the primary at least 7 months and no autolysis. My barleywine sat in primary 5 months, no problems.

Now, I left a carboy out that had been racked, but still had the yeast cake in it for a few days in the hot sun. Oh yea, problems.

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Old 06-25-2009, 11:43 AM   #10
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Had it once but I can't find the notes. From memory it was somewhere between 4 and 5 weeks in primary.

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