mold in beer

Reads 1361 • Replies 6 • Started Wednesday, January 16, 2013 3:15:14 PM CT

Thread Frozen

beers 4 º 15:15 Wed 1/16/2013

OK. This is kind of related to my previously posted fruit beer question. Iíve purchased the requisite raspberries to add to my fermentor near the end of the primary. I froze them last weekend. The wife says "what if there was mold on them?" I didnít know to wash them before freezing, cause, unlike her, I didnít major in biology.

I now wish sheís said something sooner, but my question is... if, by chance, there IS a bit of mold, (and I saw no evidence of it as I emptied them from eight 12 oz. containers) will the freeze kill off any possible mold, or will I be risking mold infection in my fermented brew? Iím hoping the alcohol will knock the mold down, or at least stop it from affecting my flavor. Should I thaw and rinse the berries? Boil them for a minute and pitch in the carboy? Any suggestions? I plan to add them on Thursday evening so Iím hoping to hear something soon.


beers 5792 º places 407 º 15:20 Wed 1/16/2013

Hmmm, if your wife is a biology major maybe asking her would be the first step to knowing if mold survives freezer temperatures. I wouldnít be especially concerned, berries are naturally covered with mold (spores) and these do not have a tendancy to grow in an environment where yeast is well established in tremendous numbers and the environment is already alcoholic.

Another thing to keep in mind is if the worse comes to the worst, Iíve had homebrew that had mold on it (not mine but someone elseís) that turned out just fine when he racked from below. I donít think extra manipulation of the berries will do anything in your favor, but thatís just IMO.

beers 1508 º places 102 º 15:42 Wed 1/16/2013

Hardywood had some interesting stuff happen with their Virginia Strawberry that they determined was due to a mold on the strawberries they used.

beers 9426 º places 536 º 16:01 Wed 1/16/2013

I wouldnít sweat it - many molds can survive freezing but fermenting/fermented wort is not an especially hospitable environment for yeast.

beers 4 º 16:03 Wed 1/16/2013

Well, the wife says she wasnít a microbiology major, so her guess is as good as everyone elseís. I will toss them in and see what happens. If it turns out bad Iíll blame the unconfirmed existence of mold spores.

beers 217 º 16:04 Wed 1/16/2013

You might be able to tick the basement aroma box, but it will be fine either way. You added it after fermentation and the booze will probably kill the mold.

08:56 Wed 2/13/2013

its very scary to hear mold in did you manage to notice it?

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