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Offlineblackout
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Cook dry grains at high pressure to hydrate and sterilize * 2
    #22076763 - 08/11/15 02:47 PM (8 years, 5 months ago)

I have been hydrating grains by boiling in excess water at about 5psi for about 30-35mins and letting it rest on the warm hob to cool. These are not soaked or rinsed in any way.

I just did 600g of barley (similar to rye) in excess water and this time I let it go up to about 23psi and letting it cool. It remain past 15psi for probably 15mins at least, maybe 20mins max. When it reached 15psi I took it off the warm hob to cool down a bit faster. I did not want to vent it as this can cause grains to explode. My overall cook time from the time the grains went into almost boiling water was maybe 40-45mins. As most will know higher pressure results in a higher temp and much shorter times are required to achieve the same level of reduction in contams. The reason we usually do 60-120mins in a PC is that the core of the jar takes a long time to reach temp.

The graph below shows the large can took about twice as long to reach the same core temp as the small one.



I was surprised to find I did not have many more exploded grain than normal, also they were not overly hydrated. They weighed about 1250g after. So this is 108ml per 100g dry added, which is a common enough forumla for those familiar with weight based recipes. These grains were intended for sclerotia so I was not overly concerned about overhydration or exploded grains.

I may have posted before of methods of getting to pressure quicker, so as to minimize actual cooking time to prevent overhydration. One idea is to microwave or dry roast the grains so they are 100C or over (yes they can get over 100C and still have moisture in them). Now you would have your PC full of water on a rolling boil, lid on and preheated and venting, hob on full power. Now you dump your hot grains into the boiling water and stick the lid on. This minimizes the heat up time so you might be at 15psi pretty quick. I do not think there is any need to even vent the PC of steam as the grains are all submerged in water, you are not cooking jars in the saturated steam.

I have posted before about maximizing the space of a small PC in different ways. One was to fill a large tub which snugly fits into the PC and fill it with grain. Then fill the still hot grains into many smaller jars and heat these again, by steaming or microwaving. This means any airbourne contaminants should be killed easily enough and I can fit about twice the amount of grains into the PC.

When using my large container method I had to PC for longer times to heat to the very core. But if heating directly in water there is no issue, all the grains are surrounded by the boiling water which is freely circulating around the pot. I can also get even more grains into the PC than before. My one concern is that the cores of the grain may not be hydrated quick enough and there could be air pockets insulating them, but I feel the surrounding water is close enough and has enough circulating hot water in direct contact to do the trick.

If you use large containers this may be a quicker method to sterilize. e.g. I have 4.5L containers and if they did fit in my PC I would want to give them a good 3 or 4 hours to be sure. With this method it could possibly be in the PC for 30-35mins, and microwaved for 20-30mins or so. Microwaving ensures it is up to a boiling temp pretty quick. If your PC does not go past 15psi it might still work. Quoted textbook times needed are far shorter than what we use, as they are talking of thermal death times at that time, and we do much longer to heat the core.


TL;DR- I propose pressure cooking grains in excess water past 15psi to sterilize and hydrate, then load them in open air into containers and heat again without pressure to kill off any new contams that landed in them.


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Invisiblechampinhom
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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: blackout]
    #22077021 - 08/11/15 03:43 PM (8 years, 5 months ago)

So, you boil the grain loose in the pc to sterilize/hydrate--then what? You have to transfer them to some kind of container where they can be colonized, no? That process of transfer would be  fertile ground for contamination, seems to me.:confused:


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Edited by champinhom (08/11/15 03:44 PM)


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: champinhom]
    #22077096 - 08/11/15 04:04 PM (8 years, 5 months ago)

is it less work to hydrate with pressure to sterilize then load then heat without pressure to kill new microbes
than it is to heat without pressure to hydrate grains and then with pressure to sterilize them?
for instance you can take whole oats like for horse feed boil them 30m pour them into a strainer and then before they would pass the TP test load them into jars while they're slightly wet to wet on the outside. PC them for 90m. it seems to me that that would be less work overall to me. Is it less work in your opinion to PC hydrate grains then re heat them?


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: champinhom]
    #22077108 - 08/11/15 04:07 PM (8 years, 5 months ago)

I do this in my small PC when I am prepping bulk substrate bottles. In fact I don't even microwave, simply combine water and grain together in the PC, bring up to pressure, and they are done in 20 min, perfectly hydrated and zero exploded.

Matter of fact I did this this morning when I decided on the spur of the moment I was gonna make up some bottle subs. Prepped the bulk substrate while the grains hydrated and then dumped em right into the mix.


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: champinhom]
    #22077128 - 08/11/15 04:11 PM (8 years, 5 months ago)

pc --> dry --> load --> pc ?


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: newrook]
    #22077154 - 08/11/15 04:19 PM (8 years, 5 months ago)

:popcorn:


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: bodhisatta]
    #22077170 - 08/11/15 04:23 PM (8 years, 5 months ago)

Quote:

champinhom said:That process of transfer would be  fertile ground for contamination, seems to me.:confused:



already answered
Quote:

blackout said:load them in open air into containers and heat again without pressure to kill off any new contams that landed in them.



Lots of people just boil water for 10mins or so which is believed to be enough to kill off any airbourne contams that fell in it.

Quote:

bodhisatta said: Is it less work in your opinion to PC hydrate grains then re heat them?



It depends on your individual setup. This is more suited to people who have a small PC and want to make more efficient use of it. Canning seems to be popular in the US, in other countries it is very difficult to get a large PC, or you have to pay a hell of a lot for it.

I cannot PC the containers I often colonise in, they are far too big to fit in the PC but fit in my microwave. People can get bog standard water boilers like these and load them with jars and steam. These should be easy to find in most countries.


Or you can easily make a large steamer with a large container and element.

For me its about the same amount of physical labour happening but faster turn around, so less babysitting. I would be boiling in a pot to hydrate either way, by doing it under pressure it hydrates faster and is potentially sterilizing in the process. If I did just boil I would afterwards load into jars and would PC them. I can only fit 3 jars in my PC and would do them for 2 hours.

So I can now do enough grains for maybe 9 jars and either load into a larger pot to steam, or do 3 runs of 3 jars, but if hot they do not need to be PC'd for 2 hours. If the grains have cooled I can heat them in the microwave before PC'ing or steaming.


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: blackout]
    #22087333 - 08/13/15 01:52 PM (8 years, 5 months ago)

I shook my barley grain jars and there were more exploded ones than usual so it proved hard to shake. However the jars were also overly full and had no gypsum in them.

Still I think some other grains might be better suited, popcorn or maize are harder to hydrate so might fare better. RGS also does not really explode but is very expensive for many, and not dense so in a way not suited to what I am attempting to do.


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: blackout]
    #22087585 - 08/13/15 02:44 PM (8 years, 5 months ago)

Are you using metal jars?
That alone must make take alot off PC time, interesting idea i havent seen before

edit; wtf did i do there, i should stop posting for today


Edited by thoraxx (08/13/15 02:57 PM)


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: thoraxx]
    #22087627 - 08/13/15 02:53 PM (8 years, 5 months ago)

metal jars would PC the quickest, then glass, than plastic.
metal jars are also pretty thin.
food for thought though if you have a pp5 container that's half as thick as a similar glass container the glass will still sterilize quicker that's how much better it is at heat transmittance.

edit: misread I didn't see the OFF in that sentence hah


Edited by Trusted cuItivator (08/13/15 02:54 PM)


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Offlineblackout
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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: thoraxx]
    #22087642 - 08/13/15 02:56 PM (8 years, 5 months ago)

Quote:

thoraxx said:
Are you using metal jars?



No, are you referring to the ones in the picture? those are just cans of food. I have seen in processing plants they will have sample cans of food with wireless thermometers in them, they bury them deep in the stack of tins and sterilize and monitor if the core of that jar has been up to temp long enough.

I have sterilized in aluminium cans though, with the tops cut off, this does speed up heat transfer. I talked about this more and some other ideas in this thread.


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: blackout]
    #22103314 - 08/17/15 03:56 PM (8 years, 5 months ago)

I cooked up some maize as described. It was 1.5kg of dry grain, I washed it and microwaved it while wet until it was reasonably hot. Meanwhile I had a PC on full boil with maybe 3L of water in it. Usually I would have 3 jars with maybe 600-700g dry grain in total. So I am easily doubling the capacity. I could get more in there as I was cautious about it expanding too much.

It came out weighing 2920g which is pretty good, I would usually aim to double the weight, and it should be a little under as some of the initial 1.5kg is lost to washing and dissolved into the boiling water.

It was pet shop maize with lots of broken kernels. I seived out the smaller broken ones but it still had lots left. It did not seem overly starch or mushy though.


It went into boiling water on full power.
12mins in it was at 7psi
14mins in it was at 10psi
16mins 15psi

it remained between 16-23psi for 30mins and was then taken off the heat 46mins into the process.

Coooled down to 0psi in about 15mins, so had an overall heating time of about 60mins.

It was strained and put into a preheated 4.5L container and microwaved for 30mins. The container had water added and was boiled for 10mins, it was also soaked in bleach before this. I microwaved on full for about 5mins to get it back to boiling, and then turn down to defrost to keep it hot without driving too much moisture off. It was enclosed in a plastic bag with the opening loosely tied with several silicone bands. This forms a wet tunnel which incoming air must pass through when cooling, and hopefully grab and contaminants. The microwave is not opened after the first 5mins are finished. Let it cool completely in the microwave.


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: blackout]
    #22103478 - 08/17/15 04:37 PM (8 years, 5 months ago)

I used to PC my popcorn all the time. 30 minutes at 15 PSI, after the timer goes off just pull the stopcock and let it vent then drain. Load into jars and PC.


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: blackout]
    #22558552 - 11/22/15 07:37 AM (8 years, 2 months ago)

The grains pictured above did not work. Seemed like moisture came out of the grains afterwards, maybe the microwave drives it out or something. I did it again and it is working so far. I preheated the grains in the microwave longer this time, and a shorter PC time so they would not hydrate so much.

I did not vent the PC as the grains are submerged and not been heated by steam. This allows me to get to a high pressure/temperature much quicker, if it takes too long the grains will overcook, overhydrate and explode. I preheat the grains in a microwave so they are past 100C, when I pour them in the boiling water it actually causes surges as it is hotter than the water.

975g unsoaked maize
heated in microwave until I hear 2 pops (like popcorn)
add to approx 3L rolling boiling water in PC, seal, no venting
3mins 5psi
6mins 10psi
8mins 15psi
15mins 20psi
25mins turn off still 20psi
45mins vent at 3psi

1732g afterwards.
Put into 3.5L filtered tupperware container, put inside loosely sealed autoclave bag

microwave 4mins full until puffed out as it is boiling and steaming,

30mins on defrost/low to continue boiling without excessive moisture loss.

The 3.5L container can turn on the microwave turntable, my previous 4.5L one cannot so it would not have been heated as evenly. I injected 24ml of LC and it is colonising well.


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OfflineMachiavelliavore
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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: blackout]
    #22559075 - 11/22/15 10:56 AM (8 years, 2 months ago)

Man, beautiful work you're doing here as always.  I really dig this idea of sterilize it inside with the PC, fuck around with it all you want in open air, then kill what's on the outside with a microwave.

Have you tried transfering the substrate from the PC straight to mycobags?  It seems like they would be ideal for maximizing the space usage of the microwave if they don't melt.  Also even if they got a bit clumpy you could easily break them up by hand.

Is the initial heating of the grains performed in a glass bowl?  I tried nuking some dry rice and found that thin pp5 melted quite easily.


--------------------


I spawned some popcorn casings and had double-overlay cause I didn't put enough hydrogen peroxide in my automated aquarium mister.  I only got one mushroom so I cut off the head part where the seeds fall from and put it in a jar of LC and sprayed it all over a tin of PF cakes I made with gravel, cardboard, and bisquick in my microwave.  I think it will be good cause B+ is so potent.
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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: Machiavelliavore]
    #22559384 - 11/22/15 12:12 PM (8 years, 2 months ago)

Quote:

Machiavelliavore said:
fuck around with it all you want in open air, then kill what's on the outside with a microwave.



It could be steamed too, I know many have aversions to microwaves. You could get a big drum and turn it into a steamer with a simple submersed element. You can also use a induction heating plate. In europe large PCs are rare, and if you do find they they are very expensive. Also people might simply not have space for a large PC. The microwave allows you to use large containers and it can be taken out and shook with ease to ensure the core is hot. Some have trouble with large jars stalling but jars are typically tall with filters at the top -while containers are typically shallow so do not suffer this stalling.


Quote:

Machiavelliavore said:Have you tried transfering the substrate from the PC straight to mycobags?  It seems like they would be ideal for maximizing the space usage of the microwave if they don't melt.  Also even if they got a bit clumpy you could easily break them up by hand.



I have put them in autoclave bags before. If they are not mixed up right they can melt & burn.



They puff up with steam too much for my liking, this is the difference between steaming and microwaving, you are boiling the grains in the bag and they will get hotter than the surrounding air and puff up the bag, while if steaming they do not really puff up. In a PC they will puff up if vented too fast.

The maize works well as it is quite hard and dense, it is like shaking a tub of marbles compared to say RGS which is too light. I have my tubs in autoclave bags so the outside will steam too, also it is sort of like a SAB upon cooling down. I leave them in the microwave to cool down and the inside of the bag is still wet. You do not need autoclave bags, I have used regular plastic bags. When they puff up its a sign the tub is boiling so power can be reduced.

Quote:

Machiavelliavore said:
Is the initial heating of the grains performed in a glass bowl?  I tried nuking some dry rice and found that thin pp5 melted quite easily.



Yeah, a glass pyrex bowl or a ceramic bowl, it will get very hot so would certainly melt most plastic. I stir it regularly, sometimes with a temperature probe. The popping sound is a good indicator but if you have not stirred the grains it may pop locally in a overhot section while the rest is not hot. After you hear pops I suppose you could stir and put it back in on defrost to heat evenly.


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: blackout]
    #22559436 - 11/22/15 12:25 PM (8 years, 2 months ago)

Just want to check:  Were the melting problems with the autoclave bags with hydrated PC'd grain or dry grain?

Sounds like PP5 tupperware with a generously large SFD would be the way to go for resterilizing PC'd grain in the microwave.

4qt bowls of grains or some such would be very convenient to inoculate, or perhaps even large bowls/15L tubs of PC'd straw + grains.

Man, the dollarstore had these great 4L PP5 bowls.  I only got 3 of them, wish I'd gotten more.


--------------------


I spawned some popcorn casings and had double-overlay cause I didn't put enough hydrogen peroxide in my automated aquarium mister.  I only got one mushroom so I cut off the head part where the seeds fall from and put it in a jar of LC and sprayed it all over a tin of PF cakes I made with gravel, cardboard, and bisquick in my microwave.  I think it will be good cause B+ is so potent.
Triggered yet?

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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: Machiavelliavore]
    #22559628 - 11/22/15 01:21 PM (8 years, 2 months ago)

Quote:

Machiavelliavore said:
Just want to check:  Were the melting problems with the autoclave bags with hydrated PC'd grain or dry grain?


It was hydrated grain, but would have dried out locally in the bag and so gotten to very high temps. If it is near the magnetron outputting the microwaves then it can heat up and the rest of the bag is not really heated. The bag would have been so big that it was not rotating on the turntable.

A tip is to get a bit of cardboard and cut it so it fits in the microwave and bring it to the shops to compare it to containers they have.


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: blackout]
    #22559649 - 11/22/15 01:26 PM (8 years, 2 months ago)

found my post about that bag

Quote:

blackout said:

This was after about 25mins in the microwave on full. 4kg of wet wheat which I forgot to mix up. It was a good 3" from the wall of the microwave where the magnetron was. The autoclave bag melted, most of the bag was only about 40C.

Bags are very good for microwaving in because it is so easy to shake them about. A lower setting also helps as the heat can be conducted throughout the bag.




note it was on full. I would microwave and shake about and when boiling reduce power.


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: blackout]
    #22563826 - 11/23/15 02:42 PM (8 years, 2 months ago)

Put another one on, ended up more hydrated than I planned, so quite a few exploded grains, this was barley and as I said before I think maize (or popcorn) is more forgiving as its harder to hydrate.

1kg dry barley, microwaved for about 10-12mins, a probe in it was 130C, so the grain would have been hotter as it would not transfer heat to the probe very easily. No popping heard.

Poured into about 3.2L boiling water in the PC, again this surges the water as the grain is hotter than the water. Sealed right away again with no venting heating on an electric hob.

0min 0psi
2min 2psi
4min 5psi
7min 13psi
9min 17psi
10min 20psi -power off, left on hot hob
11min 22psi
12min 22psi
15min 21psi
16min 20psi
17min 18.5psi
19min 17psi
22min 15psi
24min 13.5psi
27min 11.5psi
32min 8psi
36min 6psi
38min 5psi -take off still warm hob and put on cool hob
40min 4psi
42min 3psi
46min 2psi -opened and strained
Microwaved for 6mins on full then 40mins on defrost/lowest. This is in a 4.5L PP5 container in an autoclave bag which is crumpled up at the opening and loosely sealed with silicone tube acting like an elastic band which makes the bag puff up as it pressurises which signals when you can turn the power down.

weighed 2313g before microwaving so it took on 1313ml or 1313g or water, so this is 131ml water per 100g grain which is a more than most recommend. Excess will be boiled off while microwaving but it resulted in many exploded grains. I expect it may not be shakeable so may need lots of LC to inoculate.

Next time I would do less time. Maybe a quicker cool down time, the heat up time seems pretty good but I have no more control over that, the other option of course is less pressure. It was probably at 15psi at 8mins in and so was over 15psi for 14mins.


Edited by blackout (11/23/15 02:47 PM)


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: blackout]
    #22589270 - 11/29/15 06:24 AM (8 years, 2 months ago)

Challenge accepted, this should give me an edge with my project. I think I will try a longer pc time though. I also will not allow my PC to vent steam even from the beginning. I would imagine that the less steam released the better.


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: camplo]
    #22590237 - 11/29/15 12:46 PM (8 years, 2 months ago)

Picked up 2lbs of popcorn at a scrap metal yard for $1.  Pretty good deal, except maybe making a really attractive girl think I was a bit of freak for being willing to buy food from there.  Anyway, I'm gonna give this a shot, though if you have a full fractional sterilization microwave protocol you would like someone to test out, that might be more useful for y'all underprivileged youth.


--------------------


I spawned some popcorn casings and had double-overlay cause I didn't put enough hydrogen peroxide in my automated aquarium mister.  I only got one mushroom so I cut off the head part where the seeds fall from and put it in a jar of LC and sprayed it all over a tin of PF cakes I made with gravel, cardboard, and bisquick in my microwave.  I think it will be good cause B+ is so potent.
Triggered yet?

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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: Machiavelliavore]
    #22590845 - 11/29/15 02:41 PM (8 years, 2 months ago)

Quote:

camplo said:
I think I will try a longer pc time though. I also will not allow my PC to vent steam even from the beginning. I would imagine that the less steam released the better.



What are you going to PC, and for how long?

You realize why I do not vent right? so it reaches a higher temp/pressure quicker and so does not overhydrate the grains. If any grains or bits of grain are clinging to the upper area of the PC they might not be heat treated properly, so make sure everything is in the water and submerged. I was thinking of putting the grains in a muslin bag to make sure its submerged.

I saw a program on discovery I think with heinz beans and they had temp probes in a can inside a stack of cans being heat treated. I think the said 3mins at 121C was enough. Canned foods are usually full of liquid, i.e. not air gaps. This should be similar to what is happening in a PC full of liquid. There is no "core" of the jar, it's freely stirring up the water. I am wondering how little I can get away with once at pressure. At 20-25psi 1 minute maybe all that's needed. But if the grain is not hydrated it would be more like dry air sterilization, needing a lot more time.

Quick venting to cool it down could also cause exploding grains though, so you have to get a correct balance -too long in the hot water and they explode -too quick a cool down to prevent overhydration can cause them to explode.

You could do test amounts of grain to see how much they hydrate. But if you only put say 250g of grain in 1L of water instead of 1000g in 4L of water then it will not be the same with a given power. If you are applying the same heat then the 1L will roughly heat up 4 times faster, and cool 4 times faster than the 4L test. If you can get a much higher power heat source then heat up time will be less.

Quote:

Machiavelliavore said:
though if you have a full fractional sterilization microwave protocol you would like someone to test out, that might be more useful for y'all underprivileged youth.


Exploding grains is always a problem, your grains can get past 100C in a microwave no matter what others say, and easily explode. I think you would have to add just enough water to hydrate and heat. And then add more water for the next time, which should probably be preboiled, especially on the last round of treatment. Grains should be shaken frequently too to stop hot/cold spots

I have heat treated a coir & BRF mix in a pot which I plan on injecting with LC soon. I added a glass shot glass to the tub to act as an agitator, its nice & heavy so should be able to shift it. If in bags it could be mixed manually but I am not fond of bags.

Coir & BRF is forgiving as you can add loads of water as there is nothing to explode, this means it will steam up really well and heat far more evenly.

Any tek for a microwave cannot be as simple as PC or steaming times, due to moisture loss. You need to know your own microwave and substrate. But once you use the same substrate, microwave, power levels, containers, time etc it should be repeatable.


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: blackout]
    #22591467 - 11/29/15 05:22 PM (8 years, 2 months ago)

I did not work out for me, I had too much grain to process and the pc could only hold so much water.
It took for ever to reach temp. I would of had to of done it having the water boiling and the grains microwaved and even then I wonder if it would be possible given the large amount of grain I would like to process. So I prepared my Cjar with the soaked grain I intended on using in the first place.

It seems this whole thing probably works but is a race against time, needing to get to 15psi asap in order to start the 15 minute count and initiate cool down so that the whole thing last less than an hour.


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: blackout]
    #23757515 - 10/21/16 09:56 AM (7 years, 3 months ago)

Tried this again with poor results as it overhydrated, will put figures up for the record to show what does not work. 600g room temp unsoaked groats added to 2.5L hard boiling water. I think the groats I got were oats with the loose outer husk removed.

0min dumped in
3min30sec boiling again.
4min 1psi
6min 5psi
8min 10psi
10min 17psi
11min 20psi
12min 25psi (taken off heat)
15min 18psi
16min 17.5psi
18min 15psi
19min 14psi
20min 12.5psi
21min 12psi
22min 11psi
25min 8psi
26min 7.5psi
27min 7psi
30min 5psi
32min 3psi
34min 2.5psi
35min about 2psi
vented it in bursts at this point, and it was very overhydrated, not sure if venting at 2psi would cause such a burst, I doubt it and reckon they were overhydrated at that time.

The 600g now weighed 1406g and weight would have been lost to the starchy water. That would be 134ml added per 100g grain which is a lot, and would be more as some of the 600g was washed away.

It was ready for the bin but instead I wanted to try 2 things, G2G in open air and adding blended/powdered coir to absorb the excess moisture. I rinsed off all the starch that I could. Powdered coir was added, didn't weigh it, actually looked pretty well after that. 355g of colonised popcorn was added. Very little chance of this coming to anything.


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: blackout] * 1
    #23769848 - 10/25/16 12:16 PM (7 years, 3 months ago)

Did the same as the previous post 600g groats.

below are minutes and pressure

2 boiling
4 2 (i.e. at 4mins it was 2psi)
5 5
7 12
8 15
9 20 (take off heat)
11 18
12 17
13.5 15 (so 5.5mins were spent at 15psi or higher)
15 13
17 11
18 10
19 9 (began to cool the pot with a trickle of water)
21 4

I forgot to note the time at this point, my timer was stopped at 30mins so that is the max it would have been, but I think it might only have been 25mins. No venting was done at all.

The grain weighed 1222g, so very close to my goal of 1200g. Not many grains appeared to be burst, I presume some were already broken.

They went into a 3.5L container, this had been microwaved with water in it inside a large plastic bag for 10mins. This was then microwaved for 4mins in the same bag, the bag puffed up at about 3mins indicating it was boiling. It was turned to defrost for about 24mins, every 6-7mins it was put on high again until the bag puffed up to show it was definitely boiling. The plastic bag shows that it is steaming, traps steam around the outside of the container, it pressurises it slightly at times, when cooling it is like the container is in a SAB as it remains wet -and when cooled I will use it like an SAB, i.e. leave the container in the bag and work inside the bag itself, which remains wet.


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: blackout]
    #23769906 - 10/25/16 12:36 PM (7 years, 3 months ago)

I remember the old days of simmering the grains.

Boy do i feel dumb now.

Nice method man!


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Re: Cook dry grains at high pressure to hydrate and sterilize [Re: LogicaL Chaos]
    #23769957 - 10/25/16 12:54 PM (7 years, 3 months ago)

Quote:

LogicaL Chaos said:
Nice method man!



Well nothing is proven here, unless you simply mean a quicker way to hydrate grains before doing traditional sterilization techniques, and of course people have been doing pressurised hydration before, but I have not heard of any going past 15psi while hydrating, some limit to pressures say 5psi. Sterilization times fall dramatically with pressure/temp.

When pressurised I believe it hydrates faster not only due to higher temperatures but since water is forced into the grains, so its going to have to be fine tuned by the individual. 2mins more at 18psi is going to cause far more difference than 2mins simmering. I have no doubt you would get more consistent results by regular simmering. It will be grain dependent too, and not just "rye takes x mins" you would find variation between batches.

my previous grains have not gone bad just yet, I think they were still too wet even with the coir added, I had a peek and the popcorn had recovered but it did not seem to have leaped off onto the groats. I have seen delays before when doing G2G from even the same grains at different hydration levels.

I would not advise anyone to bother trying microwaving either, unless you have a good understanding about all the issues/problems associated with using them, many are evidently totally ignorant about them -people still ending up with burnt tongues and half frozen dinners, clueless...


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