The effects of boiling on AAs.

[Duxuk]

I have been looking for a way to increase the flavours associated withg late hopping and reduce the conversion of AAs to iso AAs.
In other word to make my beer taste better!
Sounds simple but I wanted to know if I should cool my wort before adding flameout hops. Cooling to 90C has seemed to have a positive effect. It may be that my extraction rate will fall by cooling but my hope is that I am extracting more of the unisomerised AAs,

This paper gives the best information I've seen if you are of a scienfific bent.

http://www.ipcbee.com/vol41/003-ICEBB2012-E005.pdf

It does seem that if I add my hops as soon as the heat is turned off then the reaction will take place as it does when you boil. The temp of your wort will fall quickly anyway so maybe there's nothing to worry about. Maybe more dry hopping is the ultimate answer but I must say that I think the flavours of dry hops and flameout hops are distinctly different.

Right then students, turn over your papers and discuss.

 

[Hawks]

I tend to add mine to steep at around 80c - I don't know the chemistry behind it, nor will I pretend to - twas just what I read a long time back and it seems to work. :thumb:

On the other hand, I've never tried splitting the brew and putting some in at FO for half ( which I do if tight for time ) and steeping the others at 80c. :wha:

 

[RobWalker]

first wort hopping will make the hop aroma oils more soluable, resulting in smooth bitterness & more aroma from your bittering hops. I chuck mine in after the mash and then start heating the water up, that works fine. one to consider I guess, especially for single hop beers.

you sure you don't wanna just use more and dry hop too? boil some hops into the priming sugar solution? :whistle:

 

[fisherman]

No doubt about it. I boil for 60 mins so 60% of your intended IBU in at the start. At 15 mins to flameout add 40% of your IBU and as a bonus at 5 mins add 20 grms of extra hops and soak for just 15 mins then cool. job done the 5 min additions are so good my beer was an APA and the late hops at 15min and 5 min were Citra.Fuggles for the bittering hop.