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Old 03-24-2012, 11:07 PM   #1
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Default Lactobacillus delbrueckii

I pitched some l. delbrueckii into unfermented, unhopped wort and have it sitting in a glass jug in a heated water bath at 85 degrees. It's been two days and I see no signs of anything. What is going on? Will I see any visible signs?

Also, what is the difference between delbrueckii and brevus?

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Old 03-24-2012, 11:37 PM   #2
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I'm not sure if this strain produces Co2 or not. I use it in cheese making to acidify the milk and I've never seen any signs of it producing Co2.

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Old 03-25-2012, 12:18 AM   #3
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My wyeast lacto starter sat for 2 weeks in a pint of apple juice. It didn't show much activity at all, but showed visible growth at the end of the 2 weeks. Upon pitching it in 5.5 gallons of Berliner weisse wort (no yeast added at this point) it was bubbling vigorously, like seltzer vigorously, to the point where I could hear it. I only used it that time, but let it ride for a week or two at elevated temps and then pitch.

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Old 03-25-2012, 02:25 AM   #4
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Quote:
Originally Posted by SethMasterFlex View Post
My wyeast lacto starter sat for 2 weeks in a pint of apple juice. It didn't show much activity at all, but showed visible growth at the end of the 2 weeks. Upon pitching it in 5.5 gallons of Berliner weisse wort (no yeast added at this point) it was bubbling vigorously, like seltzer vigorously, to the point where I could hear it. I only used it that time, but let it ride for a week or two at elevated temps and then pitch.
Interesting. I've heard that it produces CO2, sounds like there is no mistaking it. Did any crud form on the surface?
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Old 03-25-2012, 03:46 AM   #5
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I believe Delbruekii is the white labs strain and it does not produce alcohol whereas the Brevus is Wyeast and it does.

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Old 03-25-2012, 04:36 AM   #6
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Take the temperature up to 110-120. Give it a couple of days at that temperature. I don't know if you will get CO2 production but you'll definitely get some form of krausen.

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Old 03-25-2012, 07:20 AM   #7
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Check it, does it taste sour? If yes: add yeast.

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Old 03-25-2012, 03:21 PM   #8
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Originally Posted by ReverseApacheMaster View Post
Take the temperature up to 110-120. Give it a couple of days at that temperature. I don't know if you will get CO2 production but you'll definitely get some form of krausen.
Well it started showing the faintest signs of krausen last night. I woke up this morning and it had a thick layer of krausen on it. I'm wondering whether it is wild yeast. I was pretty good about sanitation, but it looks like yeast krausen. Is that normal?
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Old 03-25-2012, 04:00 PM   #9
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Yeah, when I do sour wort it always gets a brown scummy kind of krausen. I wouldn't be worried.

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Old 03-25-2012, 04:20 PM   #10
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Quote:
Originally Posted by ReverseApacheMaster View Post
Yeah, when I do sour wort it always gets a brown scummy kind of krausen. I wouldn't be worried.
Cool. And if in fact there is no wild yeast, then delbrueckii definitely makes CO2.
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