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Alpha acids (α acids) are a class of chemical compounds found in the resin glands of the flowers of the hop plant and are the main source of hop's bitterness contribution to beer. The Alpha Acids are isomerized during the boil, and it is the iso-alpha acids that contribute bitterness to the final product.
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Is there a distinction between flavoring (e.g. 30m) and aroma (late) hop additions
Short answer, "yes". Long answer ...
Excuse me for getting a little sciency, but ...
Using the simple assumption the "flavor" is a single component with concentration X(t) with a some half-life g, a …