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12-01-2005, 05:11 AM
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#1
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Senior Member
Join Date: Jun 2005
Location: Bloomington, Indiana
Posts: 116
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geek question involving alpha acids
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OK, so I was under the impression that alpha acids were hydrophobic, and had to isomerize in order to dissolve into water... does this sound familiar?
On p 64 of the Homebrewer's Companion Papazian says "Recall that alpha acids must be dissolved before they can become isomerized and affect beer bitterness."
just a curiousity kind of question...
oh, and did anyone see the IU-Duke game? we were SO close! 
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12-01-2005, 01:07 PM
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#2
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Senior Member
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You don't really even know what you're saying do you? You're just trying to impress us, right? 
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12-01-2005, 01:22 PM
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#3
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Senior Member
Join Date: May 2005
Location: Houston, Baja Oklahoma
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Quote:
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Originally Posted by Dragonfly
On p 64 of the Homebrewer's Companion Papazian says "Recall that alpha acids must be dissolved before they can become isomerized and affect beer bitterness."
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I don't think Charlie is a chemist...he could be a little muddled in the details.
Quote:
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Originally Posted by Dragonfly
oh, and did anyone see the IU-Duke game? we were SO close! |
IU should have isomerized ealier.
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12-01-2005, 02:03 PM
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#4
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Senior Member
Join Date: Nov 2004
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Gregory Noonan - New Brewing Lager Beer "The alpha acids have no aroma but are intensley bitter. They are responsible for the hops' bacteriostatic contribution the the brew. Alpha acids (humulone, cohumulone, and adhumulone) are isomerized during boiling (their atroms are rearranged) to somewhat soluble and even more iso-alpha acids. In contrast, the beta acids (lupulone, colupulone, and adlupulone) are far less stable than alpha acids, are extremely subject to oxidation, and are only slightly soluble. They become even less soluble as the hot wort cools, and are deposited in the trub as an amorphous yellow precipitate."
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DeRoux's Broux
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12-01-2005, 02:43 PM
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#5
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Senior Member
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IANAC, but I think you've got it right. The alpha acids are normally insoluble, but are isomerized during the boil and dissolve into the wort.
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12-01-2005, 06:43 PM
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#6
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Join Date: Jun 2005
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Quote:
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Originally Posted by billybrew
You don't really even know what you're saying do you? You're just trying to impress us, right? |
while I pique myself on my mastery of all things brewing, I do find it rather laborious to showboat online.
[dictated but not read]
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up next:
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secondary:
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Bottled:
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"Straight up" Pale Ale
Java Porter
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12-01-2005, 06:46 PM
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#7
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Senior Member
Join Date: Jun 2005
Location: Bloomington, Indiana
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Quote:
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Originally Posted by El Pistolero
IU should have isomerized ealier. |
now, that's just not fair.
[QUOTE=I don't think Charlie is a chemist...he could be a little muddled in the details.[/QUOTE]
I guess not - that just goes to show that those "insignificant" details aren't necessarily required to brew amazing beer consistently... or maybe Charlie's just a badass 
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up next:
Kolsch
secondary:
altbier
Keg: empty
Bottled:
maple pumpkin ale
"Straight up" Pale Ale
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Vanilla Cream Ale
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12-01-2005, 11:12 PM
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#8
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Senior Member
Join Date: Sep 2005
Location: Melnibone
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Quote:
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Originally Posted by Dragonfly
while I pique myself on my mastery of all things brewing, I do find it rather laborious to showboat online.
[dictated but not read]
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Nice!!!!!!!
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---------------------------------------------------
Desert Planet Brewing Co.
Primary :Bloody Nose Porter
Primary 2: Bloody Nose Porter
Secondary: Blackberry Melomel
Secondary 2:air
Bottled : 14 Pound Hammer Cider, Punkin Ale, know ale, Domino wheat
Keg 1: **** Inside Her
Keg 2: IPA
Keg 3: one on a weeknight, two on a weekend IIPA
Future : Ginger Cream Ale,
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