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


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Contents:
  re:  HBD, Inc. News... (John Vaughn)
  Measuring IBUs in wort (Fred L Johnson)


* * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*   Beer is our obsession and we're late for therapy!   *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * *

NOTE: With the economy as it is, the HBD is struggling to 
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spare for next year. Please consider it.

Financial Projection As of 13 Jun 2010
       Projected 2010 Budget  $3305.65
 Expended against projection  $1899.76
Projected Excess/(Shortfall)  $  38.08

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Date: Mon, 21 Jun 2010 21:47:32 -0800
From: John Vaughn <hogbrew at mtaonline.net>
Subject: re:  HBD, Inc. News...

It is great to see the HBD's financial position is looking better.  I 
sent my $25.  Thanks to all who have ponied up.  Now it's time for the 
rest of you to do the same.

Pat, thanks for all of your hard work.



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Date: Tue, 22 Jun 2010 09:31:17 -0400
From: Fred L Johnson <FLJohnson52 at nc.rr.com>
Subject: Measuring IBUs in wort

Can anyone tell me if the ASBC spectrophotometric method for measuring IBUs
in wort includes a filtration or centrifugation step to remove trub? If the
method does not include trub separation, does anyone know to what degree the
presence of trub in the extraction affects the results? I can imagine that
some of the material measurable in the ASBC spectrophotometric method as an
IBU might be bound to trub proteins such that the value obtained after trub
filtration could be lower than that obtained without filtration. Anyone have
any knowledge on this?

On a related topic, what materials besides isomerized alpha acids contribute
to the IBU value in the ASBC spectrophotometric method?

Fred L Johnson
Apex, North Carolina, USA




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