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Old 05-29-2009, 08:23 PM   #1
bnscherm
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Has anyone considered using hydrogen peroxide to aerate/oxygenate there wort prior to pitching? It is my understanding that H2O2 would decompose into two H2O molecules and one O2 molecule. Maybe someone with more of a chemistry background can chime in.

Seeing as how hydrogen peroxide is antiseptic I would think it would be important to add the H2O2 to the wort and give it a good stir before adding the yeast...

 
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Old 05-29-2009, 08:33 PM   #2
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It's been discussed several times and, IIRC, it's suggested as being too antiseptic for the yeast. Likely killing them or stressing them beyond benifit.

Olive Oil appears to have more merit but only with a couple relavent studies.

Shaking, Aquarium pumps or good ole fashion Oxygen have been proven tho'.

 
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Old 06-01-2009, 07:14 PM   #3
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Shaking has yet to fail for me.


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Old 06-02-2009, 08:07 PM   #4
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Old 06-02-2009, 08:16 PM   #5
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Quote:
Originally Posted by Pangea View Post
Most solutions of H2O2 are available in 50% aqueous.
Where are you buying your peroxide? I haven't seen anything OTC above 30%.

 
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Old 06-02-2009, 08:51 PM   #6
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Quote:
Originally Posted by Pangea View Post
Hydrogen peroxide is H2O2 - and will dissociate in water to 2 H+ ions and Oxygen gas (O2).
-1 for high school chemistry

Try 2 H2O2 --> 2 H2O + O2.

The power of hydrogen peroxide is not the acidity(which is weak), but the fact that it is one of the strongest oxidizing agents. Normal, drug store H2O2 is only around 3% and that is enough to bleach hair (see peroxide blonde). 50%, that stuff is corrosive and no one is going to sell it to individuals at that strength.

The biggest issue with adding H2O2 to wort would be the compounds that would result from the redux reaction. Sure you'll have some extra H2o and O2, but what else?

+1 for shaking.

 
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Old 06-02-2009, 09:20 PM   #7
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Quote:
Originally Posted by GNBrews View Post
Where are you buying your peroxide? I haven't seen anything OTC above 30%.
At work we were told to use up all the >30% peroxide as it has made the leap to the "watched substances" list by Homeland Security. Apparently if you want to use something stronger than 30% you must be a terrorist.

And yes, the peroxide would probably do mean and hurtful things to your yeast. We use it to keep critter populations down.
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Old 06-02-2009, 10:45 PM   #8
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hmmm, anyone want to figure out how much H2O2 yields enough O2 for properly oxygenated wort?

 
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Old 06-02-2009, 10:56 PM   #9
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Speaking of high school chemistry, I'm pretty sure hydrogen peroxide doesn't break down into O2 and H20 for sh*ts and giggles, it's going to need a catalyst and I don't think anything in beer qualifies. Plus, has anyone ever mouthwashed with H2O2, it tastes f**king disgusting. HOW IS THIS BEING DISCUSSED AS A POSSIBLITLY?!?!...sip...sip...okay, sorry about that.

Oh and then there's this:

Ingestion:
Large oral doses may cause irritation and blistering to the mouth, throat, and abdomen. May also cause abdominal pain, vomiting, and diarrhea.
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Old 06-02-2009, 11:13 PM   #10
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Quote:
Originally Posted by z987k View Post
hmmm, anyone want to figure out how much H2O2 yields enough O2 for properly oxygenated wort?
OK. I'll bite.

Assumptions: 2H2O2 --> 2H2O + O2
Neglecting everything in the wort that isn't water, 5 gallons is roughly 19 liters.
8 PPM target value for oxygenation.
All oxygen released by H2O2 goes into solution (this probably isn't the case).

19 l water * 56 (mol/l) = 1064 moles of water.

1064 mol water * ( 8 mol O2 / 1,000,000 mol water) = 8.5E-3 moles O2 needed.
Since 2 mol H2O2 yields 1 mol O2, we'd need 17.02E-3 moles of H2O2

With a molecular weight of 34, you'd need 34 * 71.02E-3 = 0.578 grams, or about a half a gram of H2O2. Using a 3% solution from the drugstore would mean you'd need around 19.3 grams dilute H2O2. Doesn't seem like much, but that assumes 100% efficiency at getting the released O2 into solution.

3% H2O2 has a specific gravity similar to water, so we're talking about 20ml of dilute hydrogen peroxide.

Anybody want to give it a shot?

 
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