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Quote from: Richard on February 21, 2022, 07:31:23 pmDry yeast and yeast from a starter are in different metabolic states. Dry yeast has been processed in such a way that it has all the reserves it needs to grow and reproduce for several generations so you don't need to provide any oxygen when you pitch it. Once you make a starter you have taken it into the growth phase and used up most or all of those reserves so you will need to oxygenate or aerate your wort, just as for liquid yeast. You have wiped out one of the advantages of dry yeast, which is probably why it is not recommended. If you need to test the yeast, though, go ahead and do it.You are correct.
Dry yeast and yeast from a starter are in different metabolic states. Dry yeast has been processed in such a way that it has all the reserves it needs to grow and reproduce for several generations so you don't need to provide any oxygen when you pitch it. Once you make a starter you have taken it into the growth phase and used up most or all of those reserves so you will need to oxygenate or aerate your wort, just as for liquid yeast. You have wiped out one of the advantages of dry yeast, which is probably why it is not recommended. If you need to test the yeast, though, go ahead and do it.
https://www.lallemandbrewing.com/wp-content/uploads/2017/03/LAL-bestpractices-Propagation-digital.pdfEssentially how to make a yeast starter for dry yeast from Lallemand.
I reached out to Lallemand about the propagation protocol for Diamond lager yeast. Specifically asking about step three where it says to oxygenate at 1-1.2 Lpm for 24 hours. They confirmed to provide oxygenation/aeration continuously for that 24 hour period.
Quote from: MDL on February 24, 2022, 04:38:04 amI reached out to Lallemand about the propagation protocol for Diamond lager yeast. Specifically asking about step three where it says to oxygenate at 1-1.2 Lpm for 24 hours. They confirmed to provide oxygenation/aeration continuously for that 24 hour period.That's like a whole 5lb tank of oxygen. While that may be appropriate for a 100HL batch, it seems like overkill at home. Try SNS or, if you still believe in it, your trusty old stir plate.
Quote from: narvin on February 24, 2022, 05:23:49 amQuote from: MDL on February 24, 2022, 04:38:04 amI reached out to Lallemand about the propagation protocol for Diamond lager yeast. Specifically asking about step three where it says to oxygenate at 1-1.2 Lpm for 24 hours. They confirmed to provide oxygenation/aeration continuously for that 24 hour period.That's like a whole 5lb tank of oxygen. While that may be appropriate for a 100HL batch, it seems like overkill at home. Try SNS or, if you still believe in it, your trusty old stir plate.Or pitch another pack or two of dry yeast and skip the whole propagation process...