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Date: 23 Sep 2007 08:57:35
From: Tennessee Tom
Subject: Oxidation in Bottle-Conditioned Beers
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Regarding oxidation, I've heard the argument made that yeast (in
bottle-conditioned beer) will absorb any excess oxygen. Is there any
validity to that?
TIA,
Tom
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Date: 23 Sep 2007 22:50:46
From: Pierre Jelenc
Subject: Re: Oxidation in Bottle-Conditioned Beers
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Tennessee Tom <teastlakeNO@SPAMmyspeedworks.com > writes:
> Regarding oxidation, I've heard the argument made that yeast (in
> bottle-conditioned beer) will absorb any excess oxygen. Is there any
> validity to that?
Of course, but it's rather irrelevant. It's not so much oxygen that is the
cause of oxidation late in the game, it's the oxidized melanoidins (and
probably others) that slowly oxidize fatty acids and higher alcohols to
aldehydes and ketones. If you have oxidation of the hot wort, no matter
how well oxygen is scavenged, the beer will stale.
Pierre
--
Pierre Jelenc
The Gigometer www.gigometer.com
Home Office Records www.homeofficerecords.com
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Date: 23 Sep 2007 19:46:51
From: Ed Edelenbos
Subject: Re: Oxidation in Bottle-Conditioned Beers
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"Pierre Jelenc" <rcpj@panix.com > wrote in message
news:fd6qk6$cep$1@reader1.panix.com...
> Tennessee Tom <teastlakeNO@SPAMmyspeedworks.com> writes:
>> Regarding oxidation, I've heard the argument made that yeast (in
>> bottle-conditioned beer) will absorb any excess oxygen. Is there any
>> validity to that?
>
> Of course, but it's rather irrelevant. It's not so much oxygen that is the
> cause of oxidation late in the game, it's the oxidized melanoidins (and
> probably others) that slowly oxidize fatty acids and higher alcohols to
> aldehydes and ketones. If you have oxidation of the hot wort, no matter
> how well oxygen is scavenged, the beer will stale.
>
> Pierre
> --
In my experience, there is much to much worrying over brewing details like
this.
When I was bottling, one "trick" I read that made sense was to fill the
bottle and lay the cap on. Then after all the bottles were filled to go
back and start clinching the tops starting with the first bottle filled.
The reasoning was that residual CO2 would come out of solution and push the
air in the headspace out of the bottle. I did so thinking I was saving
batches. As I think back though, the only oxidized batch I ever had was
from before I understood why one should rack and I had poured the beer from
the primary to the secondary.
If you leave the beer in the bottle too long, it'll probably stale also.
YMMV
Ed
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