Yes this is true, would be rather pointless to extract an already extracted resin, I was assuming plant material. It was my understanding that 'virola resin' was not extracted but scrapped from the underside the of bark, a sappy rosin like material.
Non selective yes, but for plant material, absolutely, it reduces the amount of material you need to work with, as well as making it easier to digest in acid if you want to do an acid base extraction.
Freebase dmt co-distilling with naphtha, that is very interesting! I wouldn't doubt it with these alkaloids having low melting points, which also makes them very favorable for steam distillation as well, even alkaloids with fairly high m.p. can steam distill if they have a high enough v.p. or are prone to sublimation. Another thing you could do is steam distill with a co-solvent like toluene (steam azeotrope 80C or so) or naphtha. It could increase the amount of alkaloids that co-distill, or it could do the opposite too, who knows. And yes, of course the alkaloids need to be in freebase form first
I doubt the salts would come over at all, unless the water was 'misting' they need to be non-polar to form the azeotrope and steam distill
These kind of techniques are more suited towards extraction of non-alkaloid natural products, and are not really any more useful for extraction of the alkaloids than acid base. It would be wise to first test the resin for content of 5-meo-DMT, then have a go at extraction. TLC of the crude resin may work well enough.
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