Flavor hop addition time - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > General Beer Discussion > Flavor hop addition time

Thread Tools
Old 04-18-2011, 03:25 PM   #1
Jan 2011
Somerville, MA
Posts: 212
Liked 2 Times on 2 Posts

What causes hops to stop bittering when they are in the wort? When you stop the boil, the wort is still pretty hot so won't they still contribute to the bitterness of the wort even though it's no longer boiling?

I just made an IPA recently that had a relatively low amount of bittering hops, but a huge 3.5 ounces of 11% AAU hops added @10min for flavoring. I turned off the boil after the 10 min, but I didn't put my wort chiller in right away since I was still stirring to get the DME to finish dissolving. Will that extra 5-10 min of hot wort mess up the IBU? Using the calculators it seems that even an extra 5 min with that many hops will cause the IBU jump 15 or more and now I'm worried that my beer will end up too bitter.
Primary 1: Sixpoint Bengali Clone
Primary 2: Hefeweizen

Reply With Quote
Old 04-18-2011, 03:52 PM   #2
Nov 2008
Kansas City
Posts: 3,654
Liked 43 Times on 41 Posts

Yes, alpha acids isomerize in hot but not boiling wort. As an example, Pelican Pub Kiwanda Cream Ale has no hops added during the boil but is around 18 ibu.

I've always wondered how much of the difference between the Rager and Tinseth models were due to how they were calibrated to the authors' systems and in particular perhaps Rager using a counterflow chiller and Tinseth an immersion chiller (the former tends to give higher estimates).

I think these things are best approached empirically and I don't really worry about the models for really hoppy beers. If the beer is too bitter, you know what to do next time.

The isomerization will slow once the boil is over so I doubt you are getting 15 extra IBUs out of 10 minutes.

Reply With Quote
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Fruit addition? Bhunter87 General Beer Discussion 5 04-15-2011 06:00 PM
Interesting hop addition?? WildGingerBrewing General Beer Discussion 8 04-02-2010 10:48 PM
late extract addition sims_l22 General Beer Discussion 3 01-10-2010 08:40 AM
Boil time and hop flavor Yeastie General Beer Discussion 10 06-07-2009 03:45 AM
Club addition Penguin General Beer Discussion 0 01-08-2009 03:23 PM

Forum Jump