*this is fairly old*
The latest info from Jim DeKorne's The Entheogen Review is that one can avoid chemical extraction altogether, and use a wheatgrass juicer. DeKorne warns readers to exercise caution when using extracts from Phalaris until more is known about it, but here is a transcript:
"The latest scoop is that you don't even have to use chemical extractions anymore - run several handfuls of grass through a wheatgrass juicer (sold in most health food stores) and you'll wind up with a glass or so of incredibly potent liquid. One teaspoon (with MAO inhibition, of course), is a standard dose with strong grass. Only two teaspoons proved very challenging to one of my correspondents - an OD! The juice can be dried and smoked in a bong - two tokes will usually do it." http://bluezoo.org/tryptamines/ayahuasca.html