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Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Overattenuation
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Old 12-11-2009, 05:31 AM   #1
spage
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Default Overattenuation

Got an odd one for you guys. I made a big IPA that dropped from 1.076 to 1.005, way more than I anticipated. Recipe was mostly Marris Otter, 2-row, and Pale. Tons of Simcoe and Amarillo, and I used 1056 yeast @ 68 degrees. It turned out quite estery, like what I would imagine a pear stem to taste like. A hoppy, hoppy pear stem.

I am absolutely anal about sanitation, using iodophor. Is there anything besides infection that could cause overattenuation?

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Old 12-11-2009, 05:32 AM   #2
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Update: It is still young, just under 3 weeks since brew day.

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Old 12-11-2009, 05:41 AM   #3
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I've made two beers, quite a while ago, with 90%+ attenuation. The factors that I believe contributed to this are:

1. Mashing with a thermometer that hasn't been properly calibrated, which causes the mash to be too low.
2. Testing the OG with too much hop debris and trub in the tube, making the OG seem higher than it actually is.
3. Using Nottingham yeast. That stuff is a powerhouse of an attenuator.

I know #3 doesn't apply to you, but it certainly contributed to a few of my beers being over-attenuated.

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Old 12-11-2009, 05:45 AM   #4
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Mash temp may have done it, I was at about 149 degrees. Well within beta-amylase range.

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Old 12-11-2009, 02:06 PM   #5
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Did you include any simple sugars? I did a DIPA mashed at 149* with about a pound of corn sugar that attenuated to 82%. Are you certain your OG was that high?

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Old 12-11-2009, 02:22 PM   #6
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I think its more the yeast than anything. 1056 will dry a beer out pretty good. What was your fermentation temp? That yeast will give some fruity/pear esters when fermented warm.

Another culprit is lack of specialty grains. Did you have anything in there other than base malt? Even with a low mash temp, crystal malts, and other specialty grains will add some residual sweetness and body.

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Old 12-11-2009, 02:23 PM   #7
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Same thing happened to me last weekend but I inflicted my own pain. Biere de Garde I made went from 1.071 to 1.005. I mashed at 148f for 90 minutes plus a pound of sugar in the boil in simple syrup form. I used the new WLP072 French ale and did not expect 90% attenuation from this yeast. I am still hopeful this will taste ok time will tell.

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Old 12-11-2009, 02:24 PM   #8
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No sugars added, the fermentables were all from the mash. The only post-boil additions were yeast and dry-hop. OG was taken in the fermenter about 1 hour after the boil. Come to think of it though, I used a different hydrometer to take the FG. I will test the hydrometer in water when I get home.

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Old 12-11-2009, 02:28 PM   #9
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Quote:
Originally Posted by Edcculus View Post
I think its more the yeast than anything. 1056 will dry a beer out pretty good. What was your fermentation temp? That yeast will give some fruity/pear esters when fermented warm.

Another culprit is lack of specialty grains. Did you have anything in there other than base malt? Even with a low mash temp, crystal malts, and other specialty grains will add some residual sweetness and body.
Ferment temp was a consistent 68F, fermented in a bathtub full of water and a floating thermometer. Come to think of it, I absent-mindedly omitted any Caramel malt from the mix. The grist was as follows:

6# Marris Otter
5# 2-Row
3# Pale
1# Pilsener
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Old 12-11-2009, 02:33 PM   #10
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I'll give it a a little bit of time and see how it is. Considering that calculates to 9.5%, this beast probably needs a few weeks at least.

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