Why would it kill the yeast? The only information I have got from this thread from others is they have suggested that it will kill the yeast because H2O2 is a sanitiser. Yes it is a sanitiser, when mixed at the proper concentration for sanitising. What is doing the sanitising is the O2, therefore if you claim that trying to use H2O2 to oxygenate will kill the yeast, then I could claim that using oxygen to oxygenate will kill the yeast (if you get enough of it in there somehow )
No one has given any real evidence that H2O2 used at the proper concentration for oxygenation will kill the yeast. Pollox has given anecdotal evidence that it could actually work and did not reasult in off flavours, but no one has come back with concrete evidence why (or why not) this would work.
using oxygen to oxygenate actually will kill the yeast- in concentrations over ~40ppm. (so says wyeast.com) that is .004%. same as concentrated oxygen will destroy many materials (not only organic, also metals, plastics, minerals...).
hydrogen peroxide is an effective disinfectant even in concentrations down to somthing like 0.02 to 0.05%. adding a 3% or 5% soloution to almost anything living will kill it.
was the short form of me saying "i doubt anyone trying to do this would actually calculate out the oxygen content and use the correct concentration. people are most likely to overestimate by many orders of magnitude and end up killing their yeast."i would not be adding it into the beer though. you would likely kill your yeast, as others have suggested.
i would think that, yes, you could probably get the ratio correct and use it for oxygenating your wort- IF (big if) you could know how hydrogen peroxide would react with the assortment of different chemicals in the wort (as its not directly free oxygen, it needs to be converted into oxygen by some process). who knows what effect a powerful oxidizer would have on alpha acid, or the starches and proteins. who knows how much of the oxygen content of H2O2 gets converted into free oxygen.
it only shouldnt be used due to the fact that it destroys good cells as well as bad cells. it is still a potent antimicrobial agent, and will destroy bacteria, fungi, and other living things. topically, its not effective to treat bacterial infection because of the bodily process involved in an infection (puss and mucous dillute the peroxide or sequester the bacteria enough to reduce its effectiveness at destroying them).Hydrogen peroxide is NOT an antibacterial and shouldn't be used to clean wounds