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	FORUM ON BEER, HOMEBREWING, AND RELATED ISSUES
		Digest Janitor: pbabcock at hbd.org


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Contents:
  Re: IIPA IBUs (Joe Walts)
  IBUs ("A.J deLange")
  10 gallon stainless press wanted (Joe Katchever)


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Date: Fri, 24 Sep 2010 04:32:16 -0500
From: Joe Walts <jwalts at gmail.com>
Subject: Re: IIPA IBUs

Nick brings up a good point about the measurement of iso-alpha acids.
The differences between calculated and measured IBUs in this article
by Deschutes Brewery are stunning (although I don't know the formula
they use for calculated IBUs...):

http://www.deschutesbrewery.com/blog/2009/02/13/lies-damn-lies-and-statistics/

Well, I hope it's the correct article.  I'm in a hospital right now
and can't view websites with the word 'alcohol' in them.  Anyway, late
and dry hopping with high-alpha varieties are great ways to build
massive hop flavor and aroma.  Adding the majority of your late hops
at flameout and waiting a half hour before cooling your wort will help
a lot too; DMS isn't really a concern at the boiling rates of most
home breweries (I lose 15-20% of my wort in a 1-hour boil compared
with 5-10% seen by small craft breweries, who typically leave their
worts hot for a half hour to whirlpool).  Last year, I was lucky
enough to attend a presentation on hopping methods by the quality
director of Rock Bottom.  They performed a hop experiment across their
entire organization, and I found it hugely informative.  Here's my
take on their results:

http://republicbrewpub.blogspot.com/2009/06/hopping-methods.html

Joe


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Date: Fri, 24 Sep 2010 09:06:54 -0400
From: "A.J deLange" <ajdel at cox.net>
Subject: IBUs

It might be well to recall the introduction to the ASBC MOA for  
determining beer bitterness by the international (IBU) method (the  
method most accessible to home and craft brewers):
"Reports of the Subcommittee on Determination of Isohumulones in  
Beer... indicate that  bitterness units (BU), as determined in Method  
A below, express the bitter flavor of beer satisfactorily..."
I  doubt very much that the committee studies beers of over 100 IBU in  
coming to that conclusion. Whether they did or didn't note that no  
claim is made that the measurement accurately represents perceived  
bitterness.

The method itself involves extraction of the beer with gasoline and  
measurement of the absorption in 1 cm at  275 nm. The result is  
multiplied by 50. Assuming the instrument  is linear up to A = 3.0 the  
maximum it could measure would be 150 IBU. Most analysts would  
probably prefer to keep readings to no more than A= 2 for an  
instrument rated to A = 3 so that would imply that perhaps 100 IBU  
would be the upper limit.

The instrument does not have to be the limiting factor, of course. One  
could simply dilute the beer 1:1 with DI water before doing the  
extraction. In such a case a reading of A=2 would correspond to 200 IBU.

I'd have some questions about the solubility limits of isohumulones  
but I really don't know what it takes to saturate a solution with  
them. Nor do I have any feel for what it would take to saturate one's  
palate. I know I wouldn't like a beer that bitter!

A.J.





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Date: Thu, 23 Sep 2010 17:27:42 -0500
From: Joe Katchever <joe at pearlstreetbrewery.com>
Subject: 10 gallon stainless press wanted

I know, I know. I should be posting this on the flea
market but I just thought I'd stick it in here quick. Content's been
slim lately anyways. (ED: No, you should be posting it in plain text
so that I don't have to edit it... ;o)

I'm looking for an all-stainless 5-10 gallon wine press, or other
method of pressing about that quantity. I've seen commercial ones that
use belts and rollers to do the squeezing, but I don't know that a
small version of that exists. I've seen the bladder wine presses - they
are cool but too big. I want to sanitarily remove the liquid from about
10 gallons of mash quick and easy. Any comments or suggestions on where
to find such a gizmo will be welcome.

Cheers, 
Joe Karlin


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