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Author Topic: AA% degradation  (Read 228 times)

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Offline fewbrew

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AA% degradation
« on: December 05, 2017, 01:06:05 PM »
Hi all,

Can any one please provide some feedback on loss of AA% with old hops? Going to experiment with some real vintages this weekend. Applied the hop age calculator from BeerSmith to give new values. Was wondering how much merit there is to these values. Thinking of aiming for a lower ibu and lower final volume. To allow for possibly adding a bittering tea if necessary. Ideas?

Thanks.



Offline Doomed

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Re: AA% degradation
« Reply #1 on: December 05, 2017, 02:35:11 PM »
Too many variables.  How well it has been stored, exposure to oxygen, storage temperature?  Hop strain?  Hop form, pellet or whole?

How do they smell when you open hem?

Offline fewbrew

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Re: AA% degradation
« Reply #2 on: December 05, 2017, 02:52:53 PM »
Variables, that what concerns me. Stored frozen, sealed and out of light. Smells fine so far, not as potent as fresh obviously. No cheesy smell that I have read that can be apparent. Struggling to find anything study wise on old product. Apart from brulosophy. A few US uni papers here and there. But nothing on low temps an amateur would keep at. I think +2C was the lowest.

Offline punkin

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Re: AA% degradation
« Reply #3 on: December 05, 2017, 03:22:29 PM »
Aaahh don't make a simple thing complicated. It's just beer.
http://www.stilldragon.com.au/ for all your distilling related needs.

Offline Doomed

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Re: AA% degradation
« Reply #4 on: December 05, 2017, 04:13:26 PM »
Aaahh don't make a simple thing complicated. It's just beer.

It's as complicated as you want to make it  :93:

Personally, I would keep it simple and buy fresh hops :-)

Offline DrSmurto

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Re: AA% degradation
« Reply #5 on: December 05, 2017, 08:58:14 PM »
My understanding is the degradation value in software is based on hops at room temperature, exposed to oxygen and light. If stored in a vacuum sealed bag in the fridge or freezer, the degradation value is insignificant.

I regular use hops that are 3-4 years old and make no change to their AA%.

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Offline cronessa

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Re: AA% degradation
« Reply #6 on: December 05, 2017, 09:07:37 PM »
Most software allows you to select how the hops have been stored with quite a bit of particularity. I don't know that I trust that calculations though.

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Offline Zeek

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Re: AA% degradation
« Reply #7 on: December 05, 2017, 09:42:54 PM »
Just use them and see how it comes out. If its good then keep using them.
Its always a bit sad when a keg blows, kinda like losing an old friend.

Offline fewbrew

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Re: AA% degradation
« Reply #8 on: December 06, 2017, 06:36:06 AM »
Thanks for the feedback gentlemen. Will go ahead and report back.

Offline fewbrew

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Re: AA% degradation
« Reply #9 on: December 15, 2017, 05:19:12 PM »
So. How about some results. Just tried a sample from the hydrometer. Very Crystal dominant, was 8.8% of bill. BeerSmith predicted 64 ibu with age corrections in place. Don't taste it though, not that I have any idea. The ibu numbers are linear right? Would expect twice the bitterness of a typical beer? Right now I am thinking I have under bittered for a pom ipa.

Offline DrSmurto

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Re: AA% degradation
« Reply #10 on: December 15, 2017, 05:42:56 PM »
Are you no chilling and changing the calculations because of it?

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Offline fewbrew

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Re: AA% degradation
« Reply #11 on: December 15, 2017, 06:23:04 PM »
Yep cubing. But chilling with ice bottles till 79C. So extra bitterness should hopefully not occur. Using the old BeerSmith so don't have that feature. I am under bitter I believe, so alphas degraded more then expected I think.

Offline Mark D Pirate

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Re: AA% degradation
« Reply #12 on: December 15, 2017, 08:44:26 PM »
8.8 % crystal malts you said ? That is a lot for an English IPA so the resulting sweetness may be hiding the bitterness
What was the gravity of your sample ?
What was the recipe and how did you mash it ?
Life begins at 40 ....IBUs

Offline Doomed

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Re: AA% degradation
« Reply #13 on: December 15, 2017, 08:50:27 PM »
Do the exact same beer with the same process with known/fresh hops and compare.