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OfflineDharmaForKarma
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Re: Pudin's Instant Pot Tek - pasteruization, sterilization, grain prep, and beyond [Re: rockyfungus] * 1
    #27248042 - 03/11/21 11:11 AM (2 years, 10 months ago)

At last I can come clean about my secret shame:  I love the instant pot.  It definitely works, I’ve kept jars for 6 months with no contam.

Fwiw, I run oat sterilization for 2 hrs 30 minutes. Came to that after a bunch of experimenting.


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OfflineDharmaForKarma
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Re: Pudin's Instant Pot Tek - pasteruization, sterilization, grain prep, and beyond [Re: nonamekevin]
    #27267052 - 03/24/21 07:29 AM (2 years, 9 months ago)

nonamekevin,

I always use the trivet that comes with the IP. Lids would work too.

Contrary opinion: I don't leave the vent open.  The red popper takes care of releasing air as steam builds and pressure rises.  I close the lid, turn it on, walk away.


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OfflineDharmaForKarma
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Re: Pudin's Instant Pot Tek - pasteruization, sterilization, grain prep, and beyond [Re: Eminence]
    #28089411 - 12/08/22 08:41 PM (1 year, 1 month ago)

Quote:

Eminence said:
I've been using my instant pot for a couple years just for master grain jars and sometimes agar or LC, but never tried pasteurization til recently. I got trich right when my pan cyans finished colonizing the bulk, but I also probably messed up because the OP says it took 3 hours TO GET to the right temperature all the way through, but I put it on warm for just 3 hours. So does that mean I should do 4-5 hours? I typically just do the bucket tek for coir but figured this would be good for just a small amount of horse manure.




in the op he sets it to Warm for 3 hours and that gets the internal temp to 165. If you like, add another half hour to test your theory of insufficient pasteurization. But that should be plenty of time. You could also pressure cook it but I’ve never tried that with manure.


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OfflineDharmaForKarma
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Re: Pudin's Instant Pot Tek - pasteruization, sterilization, grain prep, and beyond [Re: nXr] * 1
    #28197050 - 02/21/23 07:32 AM (10 months, 30 days ago)

Heads up - Instant Pot Duo 8 quart on sale for $74 at Amazon. This one holds four quart jars on the trivet. I’ve used mine for years with 100% success. No green jars due to incomplete sterilization, ever. 

For someone who does not need the higher capacity of a Presto or AA, this is the bomb. I also cook food with it - it’s excellent at that too.


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OfflineDharmaForKarma
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Re: Pudin's Instant Pot Tek - pasteruization, sterilization, grain prep, and beyond [Re: dowodenum]
    #28197145 - 02/21/23 08:56 AM (10 months, 30 days ago)

Quote:

dowodenum said:
How long do you run your grain cycles?




Vent 10 minutes then 2:45 at max pressure. I’ve worked mainly with oats, just starting with wbs and millet. So far similar timing seems to work. Fwiw I can easily run 3 batches in 24 hours. That’s 12 jars / 3 tubs with just a few minutes attention at the beginning and end.


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Re: Pudin's Instant Pot Tek - pasteruization, sterilization, grain prep, and beyond [Re: JW123] * 2
    #28203617 - 02/25/23 07:48 AM (10 months, 26 days ago)

Quote:

JW123 said:
Always vent. The only thing I use my instapot for in this hobby is agar and I vent for 15 minutes.




Fwiw - both methods work.

I do not do any additional venting for no-pour agar or LC.  The spaces within the plates of agar and jars of broth are far less insulated and far more conductive to heat than the centers of quart jars loaded with grain. Additionally, the IP’s internal volume is tiny compared to a Presto or AA canner. Dead air spaces just aren’t a thing in this situation.

I typically cook agar and LC for 25 minutes and have had 100% success with sterilization over years of IP use.


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Re: Pudin's Instant Pot Tek - pasteruization, sterilization, grain prep, and beyond [Re: psilocyboss] * 2
    #28239311 - 03/21/23 08:54 AM (10 months, 2 days ago)

Quote:

psilocyboss said:
what happens if you forget to let it vent at the start? I thought i had it set to vent but I didn't and when i did, it only let air out for about 1.5mins. I did a 3 hour PC




You’ll be fine. Venting the IP is advised but is not quite as important as it is in the much larger canners. Those all have more air space to clear and hold at least 2 1/2 times more jars.

At the beginning (and for a couple of years) I did not vent my IP. Now, after following Stipe’s work on measuring sterilization, I do. But if I forgot I’d not lose any sleep over it. Especially with a 3 hour pressure cycle.


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Re: Pudin's Instant Pot Tek - pasteruization, sterilization, grain prep, and beyond [Re: schpat]
    #28242778 - 03/23/23 10:29 AM (10 months, 20 hours ago)

Quote:

schpat said:
Venting at the beginning is very important.  Your PC timer should only start after at lease 10 min of venting.  I prefer 15-20 min.




Are you using a PC or an IP? With the IP venting is a good idea but not as important as with a PC.


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Re: Pudin's Instant Pot Tek - pasteruization, sterilization, grain prep, and beyond [Re: MonoVision]
    #28243443 - 03/23/23 06:26 PM (10 months, 12 hours ago)

I go trivet high for 15 minute vent and 2:45 cook. There is plenty of water at the end. I’ve not measured though.


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Re: Pudin's Instant Pot Tek - pasteruization, sterilization, grain prep, and beyond [Re: Tiamo]
    #28477521 - 09/21/23 10:19 AM (4 months, 4 days ago)

Tiamo, I use an IP for quart jars exclusively and have never had contamination related to sterilization.  My IP holds 4 quart jars and 2:45 has been enough time for WBS and oats, 2:30 for millet. I’m at around 5,500 feet in elevation which adds a bit more time.


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Re: Pudin's Instant Pot Tek - pasteruization, sterilization, grain prep, and beyond [Re: Kinoko314]
    #28477726 - 09/21/23 02:29 PM (4 months, 4 days ago)

Quote:

Kinoko314 said:
Quote:

DharmaForKarma said:
I’m at around 5,500 feet in elevation which adds a bit more time.




That and the lower pressure of an IP. I run mine for 4 hours for oats.  I haven't wanted to "see what I can get away with." 

With elevation we're getting less than 10 PSI rather than 15.  That's why I double the (longest) time used with a 15 PSI PC.




Before I started I did a bunch of experiments including weighing sterilized oats for water content and putting autoclave tape inside of jars to confirm adequate temperature. (Stipe has since confirmed that IPs do sterilize jars with his more rigorous testing equipment and methodology.) Anything over 90 minutes and the temp hits 250° F but the oats didn’t look right until 2:30. Another fifteen minutes and they had the hydration I was looking for. At 3 hours they are beginning to burst.

Elevation does affect timing, for IPs and PCs alike, due to pressure reduction. 15 psi is not a magic number for sterilization though it’s a nice number to work with. It all comes down to transference of energy via time under temperature. I want to run jars as long as it takes, no less and no more.


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Re: Pudin's Instant Pot Tek - pasteruization, sterilization, grain prep, and beyond [Re: Tiamo]
    #28477732 - 09/21/23 02:37 PM (4 months, 4 days ago)

Quote:

Tiamo said:

I am below sea level.




Where I am water boils at 94°C. Messes with cooking and baking, too.


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