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Old 01-30-2017, 06:11 AM #1
SteelyX
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Decarboxylation - Data & Graphs

I think the best data we have so far of the Time & Temperature required for the efficient Decarboxylation of THC is from the GW Pharma patent application:

https://www.google.com/patents/EP1536810A2?cl=en






I graphed these and found best-fit curves in Excel. This is not rigorous, rather a rule of thumb sort of analysis.


The first 2 charts are
THC Decarboxylation vs Heating Time for various Temperatures,and
THC Decarboxylation vs Temperature for various Heating Times






Several conclusions can be drawn.

If you have good temperature control and want the most forgiving time window (for instance to allow time for sample to come up to temperature), you would choose 2.5 hours at 221° F.

If you have good time control but want the most forgiving temperature window (for instance with an imprecise oven thermostat), you would choose 260° F for 0.5 hours.

The best yield is found at 221° F for 2 hours. This may trend higher (speculating on extrapolation) if a slightly lower temperature is chosen. For example, 212° F for 2 hours may have good yield, as well as an being an easy temperature to control.

Good yields are also indicated for 260° F at 0.5 hours. Extrapolation indicates that excellent yields may also be seen at temperatures between 248-284° F for 0.25 hours.



These charts show some similarities to the widely circulated 1990 Journal of Chromatography chart:





And a couple of other views of the same data as above:







In light of all this, I have been getting excellent results by Decarboxylating and Infusing in one step. Oil, cannabis, and lecithin go into a boiling bag at 212° F for 2 hours, agitating frequently.

Does anybody else have hard data, or reproducible results to add?
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Old 01-30-2017, 06:14 AM #2
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Had to post image #6 separately

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Old 03-24-2018, 10:02 AM #3
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Instant pot

How often do you agitate during the cycle? I've been messing around with a few different methods. Lately I've been decarbing in a sealed glass mason jar inside my instant pot pressure cooker on high pressure mode which is 239 to 244 Fahrenheit for 40 minutes. I'm curious if you are getting a full decarb at that 210° temperature for only two hours. I would think that you would need to go 8+ hours at that temperature to get a full decarb but then again, I'm no scientist.

I have done batches in my magical butter machine at 220° for two and four hours and have never felt like it was as potent as lately when I've been heating the flower up to 240° before adding to the oil. I do feel like the flavor changes a little bit when heated that high tho and I'd like to maintain more of the fresh flower taste. I'm trying to figure out what the lowest temperature/time would be to get a proper decarb but also maintain that fresh flower taste.
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Old 04-03-2018, 06:13 AM #4
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i have tried various temp/time combinations and have found that a quick flash fry/constantly stirring @ 150C/300F till i smell a strong aroma, then remove from heat and place in a bowl to cool is working really well. it is so easy and quick to do, it takes around 2 minutes. ideally you don't want to see smoke or have your herb turn completely brown. i used a laser thermometer to gauge the temp my hot plate works at so i know what setting to use. if things get too hot remove from heat ASAP.
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Old 04-05-2018, 10:15 PM #5
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ozzieAI:

I decarb based on co2 bubbles and quite a bit hotter, more like U.... I concure... I cool immediately also....and fast then cool fast...

I only work with BHO tho...
usually 10 or 20g slabs..

decarb, then suck into syringes for measureed use later.
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Old 04-06-2018, 07:06 PM #6
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I was making edibles a while ago. I added lecithin to the oil mixed it up and forgot came back and noticed the mixture bubbling at room temp. I am still not sure what was happening. How could it de carb at room temp.
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Old 04-08-2018, 06:29 PM #7
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i found this interesting: https://marijuanagrowershq.com/decarb...thca-into-thc/
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Old 05-01-2018, 12:44 PM #8
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I've done some Thin Layer Chromatography testing specifically to try out decarboxylation over time ... here's a couple of my plates from [icmag TLC thread]

high THCV strain...


high CBG strain...


The initial surprise for me was how quickly you can get to ~80% of the final result -- eg converting THCA to THC (15 mins is my earliest test, but clearly much earlier than that), which is very cool when simply hunting CBD etc (or having to bake brownies in a hurry!). But it also confirms an hour or so is better if you're making edibles and want maximum conversion

And going back to this image linked by the OP, you can see where my samples fit in and basically agree, at 125°C (even suggesting 27 mins @ 122°C is optimal)

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Old 05-01-2018, 02:25 PM #9
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I researched decarbing a couple of years ago and found a site that stated the standard for decarb was 10 to 15 minutes at 220 degrees F, depending on the dryness of the mj; I do 12 minutes. Take out the mj and increase the oven temp to 250 degrees F. When the oven is preheated to 250 return the mj to the oven for 45 minutes to 60 minutes; I do 50 to 53 minutes. I've used this method probably 50 to 60 times and it has worked every single time.
The results are so potent that, regardless of strain, I never use more than .25 of a gram and many times experiment with half that just to be sure that I don't get too high for too long. This method is foolproof.
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Old 05-04-2018, 07:43 PM #10
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Anyone decarb in the 295-300 'F range? BHO decarb, hot and fast......

been doing that a bit lately, sure wish i could get lab testing done here on extracts....seems to be getting rave reviews.
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