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Old 02-08-2009, 08:51 PM   #1
Aspera
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Default Alpha Acids

I recently purchased a pound of Styrian Goldings hops. After placing the order, I noticed that the AA content was about 2% lower than usual. I was wondering if the aromatic qualities will also be affected or if this is in any way an indicator of poor quality. I'm not especially concerned about the bittering properties but would like to know if the hops are otherwise different from what I usually use.
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Old 02-08-2009, 09:07 PM   #2
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Not an indicator of poor quality, just of a different crop most likely. Are they European or New Zealand Styrian? The NZ Styrians I've see are about 2.9% AAU, while the European I recently got are over 5%. Just use a proportionally larger amount than you usually do and it should be fine.
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Old 02-08-2009, 09:13 PM   #3
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They are true Styrian Goldings (not from Austria, but from Slovenia). The AA is about 3.2%. Is it even truthful to to call a hop Styrian Golding's if it is from NZ. Isn't that just another Fuggle cultivar?
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Old 02-08-2009, 10:04 PM   #4
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Quote:
Originally Posted by Aspera View Post
Is it even truthful to to call a hop Styrian Golding's if it is from NZ. Isn't that just another Fuggle cultivar?
I agree, but I've seen Styrian Goldings (NZ) and the AA% is roughly 2.9%. Your 3.2% from Slovenia could be from a first or second year crop, or maybe it's just a bad year for that particular region. Just use about 50% more than you normally do and they should be just fine.
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Old 02-08-2009, 10:14 PM   #5
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Is there a formula to work out how to correct for different values?

The hops i need are

45.00 gm Northern Brewer [8.50%] (60 min) Hops 42.1 IBU
15.00 gm Goldings, East Kent [5.00%] (15 min) Hops 4.1 IBU
10.00 gm Goldings, East Kent [5.00%] (5 min) Hops 1.1 IBU

and the ones i bought are

Northern Brewer [5.5%]
Goldings, East Kent [4.5%]
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Old 02-09-2009, 12:24 AM   #6
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It's a direct proportion so 45gm @ 8.5% = x gm @ 5.5%. You need ~70gm of NB @ 5.5%. Using the same formula, your 15 min addition of EKG would be ~17gm and your 5 min addition would be ~11gm.
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Old 02-09-2009, 12:30 AM   #7
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For flavoring and finishing hops, the AAU doesn't matter. You're talking about fractions of IBUs in that example. I wouldn't change them at all.

Bittering hops are different- you want to "match" up the IBUs as above.
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Old 02-09-2009, 03:06 AM   #8
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Quote:
Originally Posted by YooperBrew View Post
For flavoring and finishing hops, the AAU doesn't matter. You're talking about fractions of IBUs in that example. I wouldn't change them at all.
Kybert asked about a formula, though, so I was showing how it would work. Can't disagree in this particular instance, but it would matter if there was a bigger AAU% difference even on finishing hops, e.g., 5.5% v. 2.6%.
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Old 02-09-2009, 10:43 AM   #9
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Quote:
Originally Posted by TopDog View Post
It's a direct proportion so 45gm @ 8.5% = x gm @ 5.5%. You need ~70gm of NB @ 5.5%. Using the same formula, your 15 min addition of EKG would be ~17gm and your 5 min addition would be ~11gm.
For completness, and future reference, ive added the formula to work this out, it may be usefull in the future.

PHP Code:
(max % - min %) 
---------------  
x  original weight   =   additional hops required (weight
      
max 

so

   
8.5% - 5.5
   -----------   
x  45g 
       8.5


     

=  ----- x  45g 
    8.5 


=  0.35  x  45g 
        
=  15.88g 

= new hops weight required 45 15.88 60.88g 
I think thats correct!

Reason: trying to get stuff to line up!
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Old 02-09-2009, 01:51 PM   #10
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Going back to the original question: year-to-year AA% varies a great deal more than aromatic oil levels.
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