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Author Topic: first use old yeast  (Read 1090 times)

Offline Wort-H.O.G.

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first use old yeast
« on: January 23, 2015, 04:25:42 am »
I have a vial of WLP090, best by date Feb 15th - estimated viability 30%. Pitched into my starter last night at 5pm so been going about 13 hours. cant see any active fermentation..no krausen no noticeable co2 bubbles in the wort.

Ive never used a vial this old before, and wondering if perhaps its just a longer lag time with less viable yeast or its just likely dead.
Ken- Chagrin Falls, OH
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Re: first use old yeast
« Reply #1 on: January 23, 2015, 05:57:02 am »
Be patient, it will start.   I just sub-cultured two slants from a 13-month-old Scottish and Newcastle slant. 

Offline Wort-H.O.G.

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Re: first use old yeast
« Reply #2 on: January 23, 2015, 06:07:37 am »
Be patient, it will start.   I just sub-cultured two slants from a 13-month-old Scottish and Newcastle slant.

so its expected it will take longer-again, have not ever used yeast this old before.  thanks
Ken- Chagrin Falls, OH
CPT, U.S.Army
https://www.facebook.com/pages/Harveys-Brewhaus/405092862905115

http://braukaiser.com/wiki/index.php?title=The_Science_of_Mashing

Serving:        In Process:
Vienna IPA          O'Fest
Dort
Mead                 
Cider                         
Ger'merican Blonde
Amber Ale
Next:
Ger Pils
O'Fest

Offline brewinhard

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Re: first use old yeast
« Reply #3 on: January 23, 2015, 07:47:55 am »
How big was the starter?  Stirplate?

Offline Joe Sr.

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Re: first use old yeast
« Reply #4 on: January 23, 2015, 08:01:19 am »
Be patient, it will start.   I just sub-cultured two slants from a 13-month-old Scottish and Newcastle slant.

so its expected it will take longer-again, have not ever used yeast this old before.  thanks

Yes.  Expect that it will take longer, but the results should be just fine.

You can grow viable pitchable quantities from the dregs of one bottle of beer.  Growing a starter from an older vial of yeast should not be an issue.
It's all in the reflexes. - Jack Burton

Offline Wort-H.O.G.

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Re: first use old yeast
« Reply #5 on: January 23, 2015, 08:54:36 am »
started to get active. IIRC, don't think i've ever used yeast more than 2 months old- so learned something new.

thanks for the feedback.
Ken- Chagrin Falls, OH
CPT, U.S.Army
https://www.facebook.com/pages/Harveys-Brewhaus/405092862905115

http://braukaiser.com/wiki/index.php?title=The_Science_of_Mashing

Serving:        In Process:
Vienna IPA          O'Fest
Dort
Mead                 
Cider                         
Ger'merican Blonde
Amber Ale
Next:
Ger Pils
O'Fest