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-   -   Alpha Acid loss in whole hops? (http://www.homebrewtalk.com/f12/alpha-acid-loss-whole-hops-7696/)

cweston 03-28-2006 06:04 PM

Alpha Acid loss in whole hops?
I recently got a "pound" of whole Columbus hops from HopsDirect.

As quickly as possible, I put 1 oz portions in ziplocks, squeezed every possible bit of air out, put them all in a jumbo ziplock, squeezed every possible bit of air out of that, and put it into the deep freeze (which we keep on the coldest setting).

I know that one always loses some AA to oxidation with whole hops. Anyone have a reasonable estimate of what percentage that loss is? This batch was labelled 16% AA (!!!).

I know it's kindof anal, but I'd like to have a decent guess what the actual AA is for computing IBUs.

Baron von BeeGee 03-28-2006 06:07 PM

I know ProMash and BeerSmith both estimate hop degradation after you input storage temperature and time (actually, I think they give a degradation chart with months on one axis). However, I don't know the actual formula. I think your storage technique is quite sound.

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