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Yeast and Fermentation / Re: Hope for an unintentional souring
« on: December 21, 2011, 07:54:36 AM »
Acetylaldehyde 'green apple' flavor is also an intermediate step in coversion of sugar to alcohol, so its not really surprising that you'd detect it in a young beer. Given time, the yeast will continue to convert it into alcohol, and all will be good. However, you did it no favors by racking to secondary - removing it from the yeast that would convert the acetylaldehyde to ethanol.
It can also be caused by acetic acid infection, but that would also produce a very vinegary smell that cannot be missed.
It can also be caused by acetic acid infection, but that would also produce a very vinegary smell that cannot be missed.




