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-   -   Adjusting for high hop AA% (http://www.homebrewtalk.com/f39/adjusting-high-hop-aa-135283/)

Heineken 09-04-2009 08:16 PM

Adjusting for high hop AA%
I got my ingredients for upcoming hefe and noticed the Hallertauer hops had a 8.7 AA%. My recipe has the hops at 3.7 AA%. When I input the 8.7 AA% in Beersmith, my IBUs are about twice what they should be.

Recipe calls for 1 oz -60 minutes. Can I simply use half (.5 oz - 60 minutes) the amount of bittering hops to get my IBUs closer to what they should be.

If so, any impact on the beer flavor / bitterness?

weirdboy 09-04-2009 08:24 PM

You are correct, just cut it in half. From what I have read on this subject, the amount of essential oils where the aroma/flavor come from are roughly proportional to alpha acid content, so a higher AA hop should have higher levels of essential oils as well. This may not be true in some cases, as there are hops being bred to contain higher levels of particular compounds (like alpha acids), but not others. I have also recently heard in an interview with a hops expert that the flavor and "rough" bitterness of hops cones tends to decrease in plants after a few years of harvest.

VTBrewer 09-04-2009 08:31 PM

That is a very high AA for Hallertau. Any chance the label is off?

carbon111 09-04-2009 08:34 PM


Originally Posted by VTBrewer (Post 1527907)
That is a very high AA for Hallertau. Any chance the label is off?

That would be my first guess as well...

8.7 sounds weirdly high.

homebrewer_99 09-04-2009 10:38 PM

Simple math really:

Your recipe calls for 3.7 AA and you have 8.7AAs...

Divide 8.7 into 3.7 for .425 of an oz. ;)

If it were the other way around...divide 3.7 into 8.7 is would be 2.35 oz.

Class dismissed!!:ban:

Heineken 09-05-2009 10:26 AM

It is Hallertauer NZ which apparently has a higher AA%.

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