Excerpt taken from another site
Puffers, on 10 June 2012 - 07:44 AM, said:
Gray wolf mentions in another thread that decarbing turn the cannabinoids to a non polar form would decarbing before the extraction increase yield by giving butane more non polar actives to bind to?
Good question and the answer depends heavily on the process.
Faster and more efficient extraction doesn't necessarily increase yield, because all that can be extracted, is what is there.
The Terpenator has extracted up to 27% by weight in three 1 1/2 minutes soaks in butane, and a thermos can be used to extend the soak time of simple butane extractions to insure complete removal. I didn't show that process above, but will add it to this thread.
What I like about doing it afterwards, is that I can tell exactly where I am at, so as to not over cook it. It is never possible to tell exactly what state of predecarboxylation the starting material is in.
A possible compromise, is to mostly decarboxylate it to improve extraction efficiency using a non polar solvent, and then do the final decarboxylation in the oil state.