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Old 10-25-2006, 03:49 PM   #1
Ol' Grog
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Default yeast and aeration

When we aerate for the yeast, are we talking about getting it enough O2 to take off? I mean, yeast don't need O2 for the whole fermenting cycle, do they? Thought this was a anaerobic process.

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Old 10-25-2006, 03:53 PM   #2
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Quote:
Originally Posted by Ol' Grog
When we aerate for the yeast, are we talking about getting it enough O2 to take off? I mean, yeast don't need O2 for the whole fermenting cycle, do they? Thought this was a anaerobic process.
Yeah, it's primarily for the yeast to get started, after a couple of days (3-4, I think) the process becomes anerobic. I'm no expert, but I learned a ton about this and other science-of-beer stuff from Randy Mosher's Homebrewer's Companion.

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Old 10-25-2006, 04:14 PM   #3
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O2 is needed for the yeast to grow & multiple. Once the O2 is gone, the yeast switch to anerobic processing of sugar to alcohol & CO2.

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