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BeerTools Discussion Forum • View topic - Calculating AA in Homegrown hops

Calculating AA in Homegrown hops

Physics, chemistry and biology of brewing. The causes and the effects.

Moderator: slothrob

Calculating AA in Homegrown hops

Postby skotti » Tue Feb 12, 2008 6:58 pm

I am starting to grow my own hops and I am wanting to know the AA for them. Does anyone know what is the easiest way to test them? My BS is in chemistry and the only way I can find is NIR after titration. And without buying a microgram scale and NIR the ASBC method below is inaccurate.

http://www.realbeer.com/hops/ASBC.html

Does anyone know if there is a lab that does this test?

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Bitterness

Postby slothrob » Tue Feb 12, 2008 9:18 pm

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Home tests for AA% of homegrown hops

Postby billvelek » Wed Feb 13, 2008 12:28 pm

Gentlemen, I am not a chemist and I have a fairly weak background in chemistry -- having only taken Chem 101 in college nearly 30 years ago. However, in response to this thread, and particularly the original post, let me mention that there has been some recent discussion of using titration as a home test for AA over on my Grow-Hops Group -- -- which now has 961 members. It seems, afterall, that titration might not actually be an accurate test of AA in particular, because if it just checks pH, then the beta-acid isn't being ignored, is it? I don't know if there is a 'work around' for that. Anyway, if you happen to grow hops -- or even if you don't but think you might have a solution that could help us -- I encourage you to join us and add your comments to this thread: . Thanks for any help.

Cheers.

Bill Velek
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