From
http://www.e-cigarette-forum.com/forum/showthread.php?p=5531396
Okay, I did a search, found that all the Acetylpyrazine comes from Chinese manufacturers. It was not easy to find the max ppm for Acetylpyrazine (Ap)...
Normal use levels in finished consumer product: 0.05-5 ppm.
Council of Europe limits: foods (5 ppm); beverages (5 ppm). Uses: Daily Flavor, Food Flavor, Tobacco Flavor, Other Have seen that the practise of foodflavoring with 1.000 ppm Acetylpyrazine or higher is not unusual. Dont know, maybe thats only not unusual for the USA?
Found also the following
ARTS PER MILLION CONVERSIONS ,telling; 1 ppm = 1/1,000,000 = 0.000001 = 0.0001% of undiluted, so: 5 ppm = 5/1,000,000 = 0.000005 = 0.0005% of undiluted Ap.
Now step by step my calculation with TPAs Ap that is sold by TPA in a 5%-dilution (TPA also sells Ap-1% solution and that gives of course other results.) and when staying within the Europe food-limit of max.5 ppm :
1 drop/ml = 1/20 = 5% of undiluted, meaning: 1 drop of undiluted Pa (100%) in 10.000 drops (=500ml) results in 0,0005%; the max. 5 ppm. 1 drop of TPAs 5% Ap in 500 drops (=5% of 10.000 drops)=0,0005%, the max 5 ppm-dilution, meaning: 1 drop of TPAs 5% Ap in (500 drops/20 drops) 25 ml of juice is the maximum for food.
So; 1 drop of TPAs 5% Ap in 5 ml of juice is 5 times to much for food, meaning; 1 drop of TPAs 5% Ap in 1 ml of juice is 25 times to much and 1 drop of this diluted in 1-2 ml base juice will bring it below the max of 5 ppm.
We speak here about maximum levels for food, but we vape it and maybe the max. level for food is to high for vaping, we just dont know. So lets get on the safer side and therefore choose for a max. of: 1 drop of TPAs 5% Ap diluting in 5 ml of plain PG and of that dilution I put in max 4-5 drops in 10 ml of e-juice.
European limit for food of 5 ppm
://www.e-cigarette-forum.com/forum/diy-e-liquid/236031-what-these-3-molecules.html
GG, Provari, iatty2, DIY wannabe chef