Author Topic: harvested yeast question (brewing today)  (Read 853 times)

Offline dzlater

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harvested yeast question (brewing today)
« on: March 21, 2010, 06:41:09 AM »
I took this yeast from the carboy on the 11th of March.
I swirled the yeast cake with some boiled and cooled water
and dumped into sanitized jar, and put it in the fridge. I did not
do any other rinsing of the yeast. It is WLP 007 Dry English.
I was planning on making a small starter to get it activated.
Looking at this sample you can see a small thin layer on top.
Is that the yeast and the rest all trub? If that thin layer is the
yeast it won't be enough and I'll have to use my back up dry
yeast pack.

Thanks
      Dan


Offline tygo

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Re: harvested yeast question (brewing today)
« Reply #1 on: March 21, 2010, 07:20:24 AM »
There's yeast mixed in throughout the cake.  That layer on the top is yeast that took longer to settle out.
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Offline dzlater

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Re: harvested yeast question (brewing today)
« Reply #2 on: March 21, 2010, 07:36:57 AM »
Would you use it?
I was going to take a couple spoonfuls
and put them in a 1 pint starter.

Offline denny

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Re: harvested yeast question (brewing today)
« Reply #3 on: March 21, 2010, 08:45:53 AM »
Yeah, I'd definitely use it.  But why such a small starter?
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Offline dzlater

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Re: harvested yeast question (brewing today)
« Reply #4 on: March 21, 2010, 09:15:53 AM »
Yeah, I'd definitely use it.  But why such a small starter?


I was under the impression that when repitching
a slurry that is relatively fresh one didn't need
to make a starter? The Mr Malty calculator says I
need 90 mil of slurry. I was just doing the starter
to wake it up a bit. Got to heat some sparge water
and pitch that yeast into the starter.
Thanks

Offline nyakavt

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Re: harvested yeast question (brewing today)
« Reply #5 on: March 21, 2010, 06:46:51 PM »

I was under the impression that when repitching
a slurry that is relatively fresh one didn't need
to make a starter? The Mr Malty calculator says I
need 90 mil of slurry. I was just doing the starter
to wake it up a bit. Got to heat some sparge water
and pitch that yeast into the starter.
Thanks


This is correct, a starter is not necessary if the slurry is fresh.  But a starter can be good to wake up the yeast as you said.  It's ok to make a 'wake up' starter smaller than you would for growing yeast, you just want to make sure that you do not let it ferment to completion.  Letting it ferment all the way will do more harm than good as the yeast uses up glycogen reserves to get ready to ferment then has to return to dormancy without growing any new cells.

Just to make sure, you are putting 90 mL of slurry into the starter, not just a couple of teaspoons, right?  You can do it either way, but if you are only taking a fraction of the 90 mL do not expect the small starter to grow enough yeast for the batch, you would need a larger starter or a step up to get enough.

Offline dzlater

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Re: harvested yeast question (brewing today)
« Reply #6 on: March 22, 2010, 05:16:33 AM »

I was under the impression that when repitching
a slurry that is relatively fresh one didn't need
to make a starter? The Mr Malty calculator says I
need 90 mil of slurry. I was just doing the starter
to wake it up a bit. Got to heat some sparge water
and pitch that yeast into the starter.
Thanks


..........................................................

Just to make sure, you are putting 90 mL of slurry into the starter, not just a couple of teaspoons, right?  You can do it either way, but if you are only taking a fraction of the 90 mL do not expect the small starter to grow enough yeast for the batch, you would need a larger starter or a step up to get enough.

I put at least 90ml in the starter. The starter had a bit of foam on top when I pitched it.

Thanks to everyone who responded.