Slant to pitchable starter using pressure cooker - Pics!

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floydmeddler
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Slant to pitchable starter using pressure cooker - Pics!

Post by floydmeddler » Mon Nov 15, 2010 8:24 pm

I use a pressure cooker to make my yeast starters which I build up from a single slant "scraping". This makes things very easy for me and more importantly, it sterilises the starter jars as opposed to sanitising them.

Here are the vial and jars ready to receive wort.

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I make 800ml wort using 80g of DME. I simply tip this into a measuring jug, fill up to 800ml with hot tap water and give it a good stir. I then fill from let to right: 7ml, 43ml, 250ml, 500ml.

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Then I place in the pressure cooker. The vial's top is screwed on loosely. The two jars each have a single small hole in their lids - lids are screwed on tight. The bigger jar has tinfoil fitted tightly as pressure cooker isn't big enough to allow its lid. I then add 600ml of water to pressure cooker.

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With lid securely fastened, I wait until the weight is spinning like crazy with the pressure then time for 10 mins. When 10 mins is up, I turn off heat then go to bed / work / or just leave it until it's completely cool. Then, I simply open it and fasten the vial lid securely, place a bit of Blu-Tak over each of the jar holes and clamp the lid down on the bigger jar with a sanitised rubber O ring.

These starters are ready for yeast. A single 'scraping' from my slant is all that's needed to get things rolling. From 'scraping' to 800ml of pitch-able yeast cake usually takes around 5 days. Obviously this can be sped up if I use more yeast initially.

This method really suits me. Weighing out the DME, adding hot tap water, separating between the jars, placing into the pressure cooker probably takes me around 5 minutes. The Pressure cooker does the rest. :D
Last edited by floydmeddler on Tue Jan 04, 2011 6:21 pm, edited 4 times in total.

EccentricDyslexic

Re: Slant to pitchable starter using pressure cooker - Pics!

Post by EccentricDyslexic » Mon Nov 15, 2010 9:15 pm

Nice post! One thing to rememeber is that you must leave a large space (as floyd has done) above the wort and the lid cus the wort will boil very vigourously indeed at the temps in the pressure cooker....and you will loose a lot of your wort into the pressure cooker!

nice one floyd!

Steve

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floydmeddler
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Re: Slant to pitchable starter using pressure cooker - Pics!

Post by floydmeddler » Mon Nov 15, 2010 9:48 pm

EccentricDyslexic wrote:Nice post! One thing to rememeber is that you must leave a large space (as floyd has done) above the wort and the lid cus the wort will boil very vigourously indeed at the temps in the pressure cooker....and you will loose a lot of your wort into the pressure cooker!

nice one floyd!

Steve
Very true. Cheers ED. :wink:

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Bobba
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Re: Slant to pitchable starter using pressure cooker - Pics!

Post by Bobba » Tue Nov 16, 2010 12:46 am

Great post Floyd, that really looks like the way to go for this yeast lark. Do you do your slants in there too?

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floydmeddler
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Re: Slant to pitchable starter using pressure cooker - Pics!

Post by floydmeddler » Tue Nov 16, 2010 7:10 pm

Bobba wrote:Great post Floyd, that really looks like the way to go for this yeast lark. Do you do your slants in there too?
Yes Bobba, I do. Although with the yeast slants, I can't leave them in there for hours to cool down as the agar/wort would solidify. I'm sure there would be a way of keeping them at an angle in there but not something I've really considered... yet!

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