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You are here: Home --> Forum Home --> Brewing Forum --> Brewing Discussion --> Metamorphosis of iso-alpha acids with long boils?

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Charter Member
Eden Prairie, MN
301 Posts

In the last month or so I read a brief mention that isomerized alpha acids can chemically convert into some other, non-bitter substance with extended boiling. I don't remember the source anymore.

Does anyone here have any insight on this?

Posted 34 days ago.

314 Posts

No source on hand at the moment, sorry. But yes, prolonged boiling (90++ minutes) reduces bitterness due to deterioration of iso-alpha's (beta's???). Bitterness peak/plateau is @ 60-90 minutes.

Posted 34 days ago.
Edited 34 days ago by ingoogni

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