Total Yeast Cell Count

I will give two examples of yeast cell count. First one is 0.34 B cells/ml in 6 liters of wort starter with just a few amount of slurry cake. 2nd one is 1.46 B cells/ml in 1 liter of starter including Wort+Slurry.

So when it comes to total number of yeast cell calculation,do i need to multiply yeast count with 6 liters of wort or a thin layer of slurry which is 300 ml ??

So total yeast count is 2040 billion cells in 6 liters or 102 billion cells in 300 ml of yeast slurry ??

Thanks!!

Topic first-time-brewer reusing-yeast yeast-starters wort homebrew

Category Mac

1
answered at

If you are combining the starters you have:

  • 0.34B/mL @ 6L = 2040 Billion
  • 1.46B/mL @ 1L = 1460 Billion
  • Total Yeast Cells Combined = 3500 Billion @ 7L

After combining the starters, cold crashing will cause most of the yeast to drop out and form a nice, compact yeat cake/slurry at the bottom. There are going to be residual yeast cells in solution above the cake, however, in my experience after several days in the fridge almost all the yeast is at the bottom. I decant the excess solution, leaving a small amount.

In this example, if I cold crashed this 7L starter for a few days, decanted 5 L off the top I would then say for simplicity sake that I have 3500 Billion @ 2L.

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