Kegconnection Complete Starter Kit and More Giveaway!


Home Brew Forums > Home Brewing Beer > General Techniques > Hop Isomerization Rate

Reply
 
LinkBack Thread Tools
Old 07-06-2006, 12:53 AM   #1
digdan
Feedback Score: 0 reviews
 
digdan's Avatar
Recipes 
 
Join Date: Aug 2005
Location: Pasadena, CA
Posts: 503
Liked 4 Times on 4 Posts

Default Hop Isomerization Rate

My beers have been coming up a bit more bitter than intended. I was wondering if Isomerization could be increased with its temps. Persay I'm boiling my water at 240 degrees, would the hops isomerize faster/more than opposed to 206 degrees?

are there high/low limits to isomerizations rates?

k, thx

EDIT: I just realized water only boils around 200 ish, then it turns into steam. Now I feel dumb

__________________

Last edited by digdan; 07-06-2006 at 12:58 AM.
digdan is offline
 
Reply With Quote Quick reply to this message
Old 07-06-2006, 01:40 AM   #2
Musthavbeer
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2006
Posts: 60
Default

When in the boil are you adding the hops? How fast do you cool your wort? What is the carbonation level of the finnished beer?

__________________

Serving:

A lot

Musthavbeer is offline
 
Reply With Quote Quick reply to this message
Old 07-06-2006, 02:33 AM   #3
Kaiser
Feedback Score: 0 reviews
 
Kaiser's Avatar
Recipes 
 
Join Date: Nov 2005
Location: Pepperell, MA
Posts: 3,904
Liked 114 Times on 71 Posts
Likes Given: 4

Default

Quote:
Originally Posted by digdan
My beers have been coming up a bit more bitter than intended.
Every brewery is different in the hop utilization that it will give you. You have to brew a few batches to figure this out and ad just your recipes accordingly. I have the same problem and if I want to brew a recipe that calls for 40 IBUs, I will aim for 35 IBUs to get the desired bitterness.

Kai
Kaiser is offline
 
Reply With Quote Quick reply to this message
Old 07-06-2006, 01:16 PM   #4
david_42
Feedback Score: 0 reviews
 
david_42's Avatar
Recipes 
 
Join Date: Oct 2005
Location: Willamina & Oak Grove, Oregon, USA
Posts: 25,651
Liked 132 Times on 125 Posts

Default

Isomerization is non-linear: Utilization You get more bittering per unit time early in the boil than later. The best way to control your bittering is to calculate based on AA % rather than weight and add a efficiency factor, which can only be learned by experience. Try aiming for 85% of the bittering on your next batch and see how that works. Since bittering utilization changes more slowly the longer you boil, trying to control the IBU by timing is tough. Adjusting the amount of hops is much easier.

I suspect the non-lineararity is due to the smaller grains of resin being consumed early in the boil.

__________________

Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"

"I would like to die on Mars, just not on impact." Elon Musk

david_42 is offline
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
"Isomerization" in Hops??? shot0rum247 Brew Science 16 01-18-2014 12:33 PM
Rate my IPA erock2112 Recipes/Ingredients 17 11-11-2009 06:28 PM
Boil-Off rate AGBrewer All Grain & Partial Mash Brewing 5 05-15-2007 05:17 PM