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Home Brew Forums > Home Brewing Beer > Recipes/Ingredients > Peanut butter fermentation won't stop!
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Old 08-04-2012, 02:10 AM   #1
etcetrah
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Default Peanut butter fermentation won't stop!

I was brewing a brown ale and decided to rack a gallon of it onto some de-oiled natural peanut butter (mixed 7 oz. peanut butter with 1 cup of boiling water to pasteurize and make it pourable).

The krausen on the base beer started falling after about 3 days (@68F). I let it go a total of two weeks before racking onto the peanut butter, so it should have been completely done. The portion of the base beer I bottled was at the FG I was shooting for so I didn't expect much activity from the gallon in secondary with peanut butter.

Well, after two weeks, the gallon on the peanut butter is still actively bubbling. It's in a clear glass gallon jug, so I can see it bubbling. It's not roiling like the first few days of regular fermentation, but it's far from still, as in hundreds of tiny bubbles per second that I can see gliding up against the glass.

Has anyone else noticed anything like this before? I wanted to bottle it because I brewed it for a competition and it won't have time to carbonate if I let it go much longer. But, I don't want to bottle with so much activity still apparent.

At this point, I've pretty much given up on getting this one to comp. on time, but I would like some insight on what might be going on. Do peanuts have a lot of complex sugar that the yeast have to break down or is some other process creating gas bubbles?

Thanks in advance for any help!

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Old 08-04-2012, 03:46 AM   #2
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This dude seems to have had a similar experience with his peanut butter, maybe a bit of oil left? If you read the comments, he says it came out great:

http://www.simplybeer.com/2010/03/19...porter-recipe/

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Old 08-04-2012, 01:42 PM   #3
etcetrah
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Thanks for the encouragement. I'm still hoping for something good. I just have to be more patient and let it take it's course. There's always another competition around the corner.

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