What is a phenolic acid rest?

HomeBrewTalk.com - Beer, Wine, Mead, & Cider Brewing Discussion Community.

Help Support Homebrew Talk:

BVilleggiante

Well-Known Member
Joined
Aug 9, 2010
Messages
328
Reaction score
2
Location
Petaluma, CA
I'm reading, "Brewing with Wheat" and it talks occasionally about phenolic acid rests. Can someone please explain what phenolic acid is and what are it's characteristics?

Cheers!
 

dwarven_stout

Well-Known Member
Joined
Apr 16, 2009
Messages
1,606
Reaction score
44
Location
Boise, ID
Not exactly sure, but I imagine they're talking about a rest at ~110 degrees F for 20min or so. It's supposed to develop the precursors that yeast turn into clove-like phenols.
 

rockfish42

Well-Known Member
Joined
Jun 11, 2010
Messages
807
Reaction score
20
Location
Merced
It's a ferulic acid rest, it increases the precursor chemical for 4-vinyl-guiaiacol which is the clove phenol produced by weizen yeasts. It's conducted at ~110F and >5.7 pH and there is some debate about it's usefulness as well as the proper duration. I usually prefer to use a clove heavy yeast like wlp380 instead of wlp300 and that seems to give me plenty of the clove character.
 

Latest posts

Top