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Old 02-05-2009, 08:44 PM   #1
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Default How many yeast cells are in a 5 g batch :-)

Just writing an article and curious. Has anyone ever estimated???


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Old 02-05-2009, 08:47 PM   #2
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Too many variables. It's dependent on initial yeast health, aeration rates, OG of the wort they are put into, # of cells initially pitched via a starter (see Mr Malty).


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Old 02-05-2009, 09:07 PM   #3
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This may be relevant.I spotted a section that talks about cells/ml at at a % of alcohol.
I'm afraid I'm not really interested enough to read or study it but it may help those who are.
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Old 02-05-2009, 09:12 PM   #4
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Using MrMalty's numbers, I'm going to say "on the order of one trillion."
5.25 gallons of 1.13 OG lager calls for a 20L simple starter with O2 at start with 2 liquid yeast packs at 99% viability to make 900 billion cells.
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Old 02-05-2009, 09:18 PM   #5
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5.25 gallon needs a 20L starter?
Is that a typo?

20L is around 5.25 gallon.
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Old 02-05-2009, 09:19 PM   #6
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Well, if memory serves me correctly, a liquid yeast pack grown with a starter will have about 225 billion cells at pitching time. However, they then go through another growth phase. I would not be surprised to see it double. So my very uneducated guess is somewhere around 400-500 billion.
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Old 02-05-2009, 09:22 PM   #7
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Quote:
Originally Posted by Orfy View Post
5.25 gallon needs a 20L starter?
Is that a typo?

20L is around 5.25 gallon.
Orfy, I think it is correct if we assume a couple of things. The slower generation time of lager yeast compared to ale yeast (all things equal), the OG of the target wort, and the fact that a simple starter (non-agitated) is going to simply ferment rather than get the yeast into a strong growth phase by the presence of oxygen. Another strong mathematical case for a stir-plate.

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Old 02-05-2009, 09:30 PM   #8
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I think he was just jacking up the og on the calculator until it called for a 5 gallon starter, then the calculator would tell him how much yeast is in the 5 gallon starter.
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Old 02-05-2009, 09:37 PM   #9
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Quote:
Originally Posted by IrregularPulse View Post
Hey I already answered this! Either didn't post or got deleted. Anyway, there are 37 cells of yeast in a 5G batch.
Your original post was deleted (as were a couple others); let's try and keep the conversation on topic.

I'm all for banter here and then, but threads just explode into a giant pile of poo too quickly.

Jason
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Old 02-05-2009, 09:54 PM   #10
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Quote:
Originally Posted by remilard View Post
I think he was just jacking up the og on the calculator until it called for a 5 gallon starter, then the calculator would tell him how much yeast is in the 5 gallon starter.
I need a light bulb smiley! Got it.

It was for illustration purposes only.


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