Author Topic: Sulfate Iso-Alpha Acid Extraction  (Read 320 times)

Offline wsoublo

  • Cellarman
  • **
  • Posts: 38
    • View Profile
Sulfate Iso-Alpha Acid Extraction
« on: March 30, 2014, 05:54:52 PM »
I'm using a few guides to help prepare my answers for all possible technical questions on the BJCP written exam.

I keep seeing sulfate ion listed as improving iso-alpha acid extraction in one of the guides.  However, the guide doesn't provide any reference or mechanism description.  Also, I can't find any mechanism to explain the improved extraction on Google.  I did find a patent, but it didn't list a mechanism as far as I could tell.

I understand that sulfate lends a dryness to beer and somewhat astringent taste at higher levels, but this is different from actually increasing iso-AA solubility in wort/beer. 

Does anyone have any insight?  Thanks.

Offline klickitat jim

  • Official Poobah of No Life.
  • *
  • Posts: 5978
    • View Profile
Re: Sulfate Iso-Alpha Acid Extraction
« Reply #1 on: March 30, 2014, 08:48:12 PM »
My guess, someone is using an overly fancy term. I'll bet they are talking about SO4 enhancing pereption of bitterness.

Offline tschmidlin

  • I must live here
  • **********
  • Posts: 8198
  • Redmond, WA
    • View Profile
Re: Sulfate Iso-Alpha Acid Extraction
« Reply #2 on: March 30, 2014, 11:44:35 PM »
I'm with Jim.  I've never heard of it improving extraction.  Enhancing perception, yes.
Tom Schmidlin

Offline mabrungard

  • Senior Brewmaster
  • ******
  • Posts: 1542
    • View Profile
    • Bru'n Water
Re: Sulfate Iso-Alpha Acid Extraction
« Reply #3 on: March 31, 2014, 05:08:10 AM »
That is a new one on me. I had not heard of sulfate improving the extraction of iso-alpha acids, but I'm not going to dismiss that it may or may not exist. I do know that sulfate helps dry the palate and that has the effect of improving the perception of bittering to the drinker.
Martin B
Carmel, IN

BJCP National
Foam Blowers of Indiana (FBI)

Brewing Water Information at:

Like Bru'n Water on Facebook for occasional discussions on brewing water and Bru'n Water