Hi all, I posted the below to another board with no response, so let me try here, where we seem to have more chemists/alchemists... :
I have harvested oakmoss (evernia prunastri) from my home in France (in a
particularly moist part of the Alps; I have it from both oak trees and fruit
trees , plum and apple, interested to see if there is a difference in scent),
and now I am playing with it to try to make a concrete or resinoid out of it. I
wonder if anyone has experience and could offer advice? I did look at Arktander
(sp?) and he seems to think the best extraction is from solvent (hexane) to a
concrete and then that concrete "washed" with alcohol to get the extract.
Another technique is to do a warm ethanol extraction directly, which results in
a resinoid (or just an extract if you don't evaporate off the ethanol). I have
both hexane and a Soxhlet extractor (for the ethanol extraction). I will
probably try both, but would appreciate any advice. Particularly on the hexane,
which one may wish to warm, but I hesitate to do that due to that because of its
extreme flammability. Can I use it to extract without heat?
Hexane can be uses without external heat. Unless the oakmoss thalli are extremely fragile, I would macerate them in hexane foray least a couple weeks.