Quick question for the crowd. I heard that to compare COA to COA (apples to apples) you should account for different moisture levels at testing. Here is the calculation I was provided:
Step 1) 100% minus your moisture level = DRY WEIGHT %
Step 2) CBDa mg/g divided by DRY WEIGHT % = ADJUSTED %
Step 3) Adjusted % multiplied by .877 = TOTAL CBD% at 10% dry weight
PS - (the .877 accounts for converting the cannabinoid acid (a) to the usable form of the cannabinoid -- ie what happens when you decarboxylate the cannabis.
For my attached COA I get the following:
Step 1) 100% - 17.9% = 82.1%
Step 2) CBDa 146.14 mg/g divided by 82.1% = 178 mg/g
Step 3) 178 mg/g multiplied by .877 = 156.1 or 15.6% TOTAL CBD at 10% dry weight
Also -- if you want to get total cannabinoids you would do the same calculations on all reported cannabinoids including THCa. For my COA attached that would mean the following:
Step 1) 100% - 17.9% = 82.1%
Step 2) 156.81 mg/g Cannabinoids / 82.1% = 191 Cannabinoids
Step 3) Decarb conversion == 191 * .877 = 167.507 or 16.75% total Cannabinoids
So with these calculations in mind, I get the following:
12.82% Total CBD at 17.9% moisture
versus
16.75% Total CBD at 10% moisture.
This is a huge difference if moisture levels impact the measurement of total CBD. I just want to double confirm this calculation as I would like to make a post about it on my site and explain to customers that if they are comparing COA to COA they need to nominalize the moisture levels so that they are comparing total CBD percentages on equal footing.
Comments? Thoughts? Corrections?
Nice post!
Everything here looks correct to me except if you want total cannabinoid content I see no need to apply the decarb conversion. Applying the decarb conversion gives you the total potential active cannabinoid content which is slightly different in my opinion.
Also, It's important to remember that even though you can do maths to project what the cannabinoid content would be at lower or higher moisture, when you actually do the work to get it to that point your results may be slightly different than what the formula says because of variables like time, degradation or mishandling of product etc.