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- Feb 10, 2018
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Hey guys,
Currently, when calculating my starting cell count for Whitelabs Purepitch yeast, I go to the QC website here:
https://www.yeastman.com/Login/Public/Report/PublicLabQCResult.aspx
I punch in the lot # and change the dropdown menu to homebrew purepitch, and that gives me an initial cell count in the packet.
The next place I go is the viability website here:
https://www.whitelabs.com/news/purepitch-shelf-life
From here I can work out a percentage based on the percentages given and the time the yeast was manufactured. I know it isn't perfect but it is a lot more accurate than the current Whitelabs equation used in the software.
For instance, I have a packet of WLP001 that was manufactured on 1/7/2019. The lot number is 1067653. In the current calculator, I have essentially no usable yeast.
Using the above method, I see I have 2.23 billion cells/mL. It is a 40 mL packet so on 1/7/2019, I started with 89.2 billion cells. Using the viability percentage, I now have about 79% viability so I am actually starting with 70.468 billion cells.
You can see the large disparity between the two numbers. Even just updating the percentages to better reflect the purepitch packet would be better than the current calculator allows.
Just my two cents.
Love the program and everything you do!
Sean O
Currently, when calculating my starting cell count for Whitelabs Purepitch yeast, I go to the QC website here:
https://www.yeastman.com/Login/Public/Report/PublicLabQCResult.aspx
I punch in the lot # and change the dropdown menu to homebrew purepitch, and that gives me an initial cell count in the packet.
The next place I go is the viability website here:
https://www.whitelabs.com/news/purepitch-shelf-life
From here I can work out a percentage based on the percentages given and the time the yeast was manufactured. I know it isn't perfect but it is a lot more accurate than the current Whitelabs equation used in the software.
For instance, I have a packet of WLP001 that was manufactured on 1/7/2019. The lot number is 1067653. In the current calculator, I have essentially no usable yeast.
Using the above method, I see I have 2.23 billion cells/mL. It is a 40 mL packet so on 1/7/2019, I started with 89.2 billion cells. Using the viability percentage, I now have about 79% viability so I am actually starting with 70.468 billion cells.
You can see the large disparity between the two numbers. Even just updating the percentages to better reflect the purepitch packet would be better than the current calculator allows.
Just my two cents.
Love the program and everything you do!
Sean O