Utilization of Harvested Yeast - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Utilization of Harvested Yeast

Reply
 
Thread Tools
Old 11-13-2012, 01:49 PM   #1
PtreeCreekBrew
Recipes 
 
Nov 2012
Posts: 68


I'll start off by saying that I've read the stickies on yeast washing and slanting--I've been washing/harvesting for a couple of years now and intend to start slanting, but this question relates specifically to harvested yeast.

I've been fairly unscrupulous in the past and have ended up with some rather interesting brews as a result, which I can best attribute to harvested yeast of later (or, horrors!) contaminated generations. Obviously, fixing contamination issues is easy, and is merely a matter of altering packaging procedures. I'm not horribly worried about THAT, as I've only ever contaminated one batch and that had nothing to do with yeast.

So, my question. For those who harvest yeast, are you concerned about things like generations, gravities, and the like? IE, if I harvest yeast from a 1.060 batch, I've read things in regards to only pitching that yeast into a batch of higher gravity. Additionally, have read that one should only harvest for about 2 to 3 generations. Of course, use of a starter should be assumed, and size/length of starter related to OG....

Thoughts? Basically looking for general guidelines for utilization of harvested yeast. Thanks!

 
Reply With Quote
Old 11-13-2012, 08:37 PM   #2
daksin
HBT_SUPPORTER.png
 
daksin's Avatar
Recipes 
 
Aug 2011
San Diego, CA
Posts: 4,617
Liked 357 Times on 311 Posts


Well, you can get so much yeast out of a single batch of beer that you would have to be brewing an incredible amount to take your yeast out very many generations unless that's what you want to do. I'm starting to re-use a strain as many generations as I can manage to see if I can mutate it into something of a house yeast.

As for gravity for re-use, I don't put much stock into the whole not harvesting from high gravity batches. Yeast are hardy buggers- a 1.070 beer is no problem for them if you're treating them right (pitching rates and oxygen, fermentation temps). My fermentations are typically completely finished in less than a week, even at higher gravities, so I have no problem harvesting yeast from fresh batches that way.
__________________
I can't be arsed to keep up this list of what's in the fermenters, but hey, check out the cool brewery I own!

twitter.com/2kidsbrewing .. facebook.com/2kidsbrewing .. 2kidsbrewing.com

 
Reply With Quote
Old 11-13-2012, 09:14 PM   #3
PtreeCreekBrew
Recipes 
 
Nov 2012
Posts: 68

Thanks for the thoughts. That's the type of info I'm looking for. I've done, as stated, a few generations at a time, but I'm in a more permanent space now and intend to be a little more calculated about my washing and harvesting.

How are you developing your house strain? I would think that if you're relying on mutation, you'll eventually mutate it out of existence (or, have an impermanent or unreliable house strain at best)...unless you plan on generating a large starter every once in a while and then hiding it away?

Are you attempting to cross yeasts? Or just waiting to see what happens when it starts to mutate?

 
Reply With Quote
Old 11-13-2012, 09:55 PM   #4
daksin
HBT_SUPPORTER.png
 
daksin's Avatar
Recipes 
 
Aug 2011
San Diego, CA
Posts: 4,617
Liked 357 Times on 311 Posts


I'll just take it out as many generations as I can manage. The changes are so subtle even after years of reuse, that unless something really goes weird, I suspect it won't be very noticeable.

I suppose if it gets to a place that's really awesome and unique, I would make a huge starter and slant it out and keep it around in glycerol stocks for all time, but right now it's more of an experiment than anything.
__________________
I can't be arsed to keep up this list of what's in the fermenters, but hey, check out the cool brewery I own!

twitter.com/2kidsbrewing .. facebook.com/2kidsbrewing .. 2kidsbrewing.com

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Mocktoberfest (marzen)- should i make a yeast starter with harvested yeast? mhayden37 Fermentation & Yeast 12 02-22-2012 02:24 PM
How do I use yeast I have harvested??? MikeBrnDmgd Fermentation & Yeast 20 01-04-2012 12:30 AM
Have I got enough harvested yeast? el_caro Fermentation & Yeast 22 02-20-2011 01:24 AM
Yeast harvested from a beer yeast cake used for Apfelwein? Chello General Techniques 3 02-06-2008 10:01 PM
I harvested yeast... I think pfranco81 Beginners Beer Brewing Forum 6 06-14-2007 02:43 AM


Forum Jump