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harvesting yeast from krausen?

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bassmannate

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Location: Crystal Lake, IL

Post Tue Jan 25, 2011 5:57 pm

harvesting yeast from krausen?

So, I've been wanting to start harvesting and keeping my own yeast bank. I had read that harvesting yeast from the krausen is the best way to get good yeast. I tried it with my last batch but wasn't able to get very much. I didn't get much krausen and it may just be the yeast strain (Danstar Nottingham).

This was more of a trial to see how much I could get. I hope to be able to get more from some strains that I really do want to keep! Any tips? Should I just harvest from the trub after I rack? I'd like to use the most sustainable method to get as many generations out of the yeast as possible.
Primary: Nut Brown Ale
Secondary: White Merlot
Bottled: Dry Irish Stout
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Shadetree

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Post Tue Jan 25, 2011 7:03 pm

Re: harvesting yeast from krausen?

Some strains work better than others. I've never used Nottingham, so I don't know what sort of krausen it has, but you're looking for thick, dense krausen that sticks together when you scrape it off, not foam.
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bassmannate

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Posts: 189

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Location: Crystal Lake, IL

Post Tue Jan 25, 2011 7:20 pm

Re: harvesting yeast from krausen?

Ah, I understand now. So, I want to do that if I use a strain that produces lots of dense krausen. Otherwise, I should just scoop it out of primary and wash.
Primary: Nut Brown Ale
Secondary: White Merlot
Bottled: Dry Irish Stout
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Legman

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Post Tue Jan 25, 2011 8:02 pm

Re: harvesting yeast from krausen?

What you are referring to is called "top cropping".
I've done this a few times to make starters from, but have never saved it for long term storage.

Like Shadetree said, some strains work better for this than others.

Ryan6458 made a pretty good post awhile back about this with pics. http://forum.northernbrewer.com/viewtopic.php?f=26&t=92930
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ryan6458

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Post Tue Jan 25, 2011 11:00 pm

Re: harvesting yeast from krausen?

I wish I would have taken those pics a day sooner, but you can still see what Shadetree is talking about. If the krausen isn't thick and snotty with yeast, then that yeast isn't a top cropper. Look at the sides of the bucket in the link above and you'll see how thick with yeast it is. If you want a strain that's a tried and true top cropper, try WLP001.
Compare your lives to mine and then kill yourselves! -Bender
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bassmannate

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Posts: 189

Joined: Sun Jul 11, 2010 4:59 am

Location: Crystal Lake, IL

Post Wed Jan 26, 2011 7:58 am

Re: harvesting yeast from krausen?

Thanks for the pics! I see what you mean. I've had yeast strains do that before. Too bad I can't remember which ones! Trial and error I guess.
Primary: Nut Brown Ale
Secondary: White Merlot
Bottled: Dry Irish Stout

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