I think that Psychotria viridis should be processed in a way similar to what is described in post no 336258 (how do I link to a post in a post?), which is a description of a back extraction, to which I will refer in the future as a B/A. Indeed, it is the A/B performed backwards.
This is performed to avoid the problems of green leaves, which are full of chlorofyll and probably loaded with tannins of the not hydrolizable type (see
http://www.ansci.cornell.edu/plants/toxicagents/tannin/
)
Here is an abstract of an isolation as published at page 181 of Trout's Notes on Some Simple Tryptamines
http://trout.yage.net/sc/page3.html
Original ref:
Hochstein & Paradies (1957) Journal of the American Chemical Society 79:5735-5736:
Text according to Trout:
[They] used what probably was either Psychotria viridis or Diplopterys cabrerana but which had been furnished to them as an aqueous extract and misidentified as Prestonia amazonica.
They used Sodium hydroxide to bring the pH to 10.5 and extracted three times with Chloroform. After washing with water the chloroform was evaporated in vacuo to a viscous residue.
This was then vacuum distilled at 170 deg. at 0.01 mm to yield DMT as a colorless oil that crystallized spontaneously on standing. It was further purified by a second vacuum distillation.
So far Trout. To me this is an indication that there is very little experince with DMT purification from Ps. veridis - I mean, if this is the *only* reference in all the existing literature and it is not even certain that it is not Diplopterys cabrerana (a more potent source compared to Ps. viridis), then I wouldn't count on success. So do not spoil your supply but start with little test extractions first!
bibliopharmacophile