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BeerTools Discussion Forum • View topic - Risk of oxidation or not?

Risk of oxidation or not?

What went wrong? Was this supposed to happen? Should I throw it out? What do I do now?

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Risk of oxidation or not?

Postby djavet » Sat Jan 06, 2007 6:43 am

Hello

I just transfert my hobgoblin clone to the secondary and wish to know if I've a risk of oxidation with the air space?

Image

Because since 24h, I see no activity and the pressure doesn't move into the airlock...

Thx for your feedback.
Dom
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Postby slothrob » Sat Jan 06, 2007 8:29 am

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Worried?

Postby brewmeisterintng » Sat Jan 06, 2007 8:37 am

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Postby djavet » Sat Jan 06, 2007 1:33 pm

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Postby djavet » Sun Jan 07, 2007 6:54 pm

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Postby slothrob » Mon Jan 08, 2007 10:27 am

19L in a 20L carboy should be fine. The beer will release some CO2 and purge most of the O2 from the head space. Also, there is probably enough yeast activity in secondary to use up some of the O2.

Depending on the yeast, bottling at 1.017 from a 1.051 beer is a little risky, unless you took gravity readings on a couple days and know that fermentation was complete. There may be enough fermentable sugar left in the beer to cause over carbonation or bottle bombs.

You might want to put these somewhere they will not cause damage if they explode and leak. Maybe in a plastic container of some kind.
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Postby djavet » Mon Jan 08, 2007 10:33 am

After 2 days, always at 1017.
in my recipe, the final gravity are 1013 - 1015. So ...
I add only 5gr per liter. I've bottled once with a 1020 gravity with no problem. But you absolut right. I will see in one week how the bottle look like, but I think regarding the final gravity without move during 2 days should not be a problem.

But I will buy this carboy glass and use it if I rak to secondary or let the whole stuf into the first fermenter.

Regards, Dom
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The road we have traveled

Postby brewmeisterintng » Mon Jan 08, 2007 7:19 pm

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Postby jctull » Tue Jan 09, 2007 12:38 am

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Postby djavet » Tue Jan 09, 2007 1:53 am

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Postby jctull » Tue Jan 09, 2007 6:21 pm

I should have qualified my statement about leaving it in the secondary. The reason most people do their secondary in glass is because plastic is gas permeable. If you leave it in plastic for extended periods, oxidation can occur. I have know idea at what rate this occurs, but I do know that you want to use plastic if you are doing something like a lambic or Flanders sour because you do want some gas exchange to occur over time.
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What does oxidized beer taste like?

Postby billvelek » Tue Jan 09, 2007 7:39 pm

Just out of curiosity, is there some characteristic flavor associated with oxidized beer? I brewed a California Common, although I was not able to keep the temp down to the recommended range (I fermented at about 65-68F), but I detect an off-flavor that I have never had in any of my other beers. I can't think of any reason why it would have become oxidized, or any hot-side aeration problems, and the temp is the same that I use for that yeast in other beers, but it has a very subtle distinct flavor that reminds me of something like cigarette ash -- like I had dipped an ash tray in it or something. It is drinkable, but I would never offer a sample to anyone. I just don't know what might have caused it, but I'd like to avoid it in the future. Most of my brews come out pretty good -- which tells me that I am doing things right for the most part -- but this California Common is a big disappointment.

Cheers.

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Oxidation Effects

Postby brewmeisterintng » Tue Jan 09, 2007 10:35 pm

I didn't write it but did some web searches.
Oxidation effects beer flavor in a few ways. The most unpalatable occurs mostly in light-colored beers: the formation of trans-2-nonenal. This compound, which is classified as an aldehyde, tastes like paper or lipstick (lipstick and paper actually taste quite similar!). It has a very low flavor threshold; as little as 0.1 parts per billion can be discerned in beer!
The ash tray flavor is associated with black patent malt. I can't see you putting that in a califoria common so that doesn't help much.
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Postby soyousee » Wed Jan 10, 2007 11:47 am

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