Spike Brewing Giveaway - New v3 Kettle

Home Brew Forums > Home Brewing Beer > General Beer Discussion > Harvesting yeast question
Thread Tools
Old 01-15-2013, 05:19 AM   #11
Feedback Score: 0 reviews
Join Date: Dec 2012
Location: (West) Seattle, WA
Posts: 7

Originally Posted by thrstyunderwater View Post
Do you care to post anymore on this or can you point me to another source? I'd love to be freezing yeast but haven't ever found a source on how to properly use the glycerin.
Did you see this article?: Freezing Yeast.

dpark is offline
Reply With Quote
Old 01-15-2013, 07:21 AM   #12
Feedback Score: 1 reviews
Join Date: Nov 2010
Location: utrecht, netherlands
Posts: 2,020
Liked 267 Times on 196 Posts
Likes Given: 26


mutations in a yeast strain are only bad if they make your beer bad. genetic mutations can occur randomly by small changes to the DNA, but the whole population of cells can't suddenly mutate. but it's very true that the behavior of the population can change over only a few yeast generations. harvest just the last dusty bit of yeast to flocculate, and repitch that, you'll get a very different result than you expect from that strain. these behavioral changes are likely 'epigenetic', rather than due to DNA mutations; genes stay the same but get locked into certain on/off states, and it's these states that can confer certain properties, like willingness to flocculate, ability to consume maltotriose, whatever. but one random mutation in a population of hundreds of billions of cells cannot propagate rapidly through the population over the course of a few brews, with each brew hosting fewer than 10 yeast generations, even if you select for it. if you keep harvesting healthy clean yeast and your beer keeps being good, and the yeast behaves the way you want it to, keep using it. not that you shouldn't save a master stock if you can, and propagate new pitches from that whenever needed; it's a luxury but it's nice to have a few strains banked, and you will need to go back to the master stock eventually. remember it will take longer to get them up to a pitchable amount than a new smack pack, and you should work very cleanly at the early steps to avoid propagating contaminants.
dinnerstick is offline
Reply With Quote

Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Harvesting yeast question Dutch218 General Techniques 9 12-21-2012 02:56 AM
yeast harvesting question AleFred Beginners Beer Brewing Forum 5 08-22-2011 07:00 PM
Another Yeast Harvesting Question...Trappist Yeast This Time kjung Fermentation & Yeast 1 02-15-2010 07:24 PM
Harvesting yeast question fritz_monroe Beginners Beer Brewing Forum 11 06-12-2007 04:49 AM
Yeast Harvesting Question KopyKat General Techniques 1 03-01-2006 10:22 PM

Forum Jump