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biotechdude:
https://www.thevespiary.org/rhodium/Rhodium/pdf/chinese.ephedra.quantitative.analysis.pdf =======> pg 3

http://www.ephedra.demon.nl/stories/ephedra.htm  =======> Table 2

There u go lads :)

Master_Alchemist:
Well i'll be damned, i am so goddamn tired after reading that.
to make it worse i started reading the next page to discover in horror 10 lines later, that page 2 is CC of page 1.
Aurielis, your post has got the better of me tonight!
goodnight all i think im about to haemorage.

Rhodium:
Quantitative Analysis of Ephedrine Analogues from Ephedra Species Using 1H-NMR
Hye Kyong Kim, Young Hae Choi, Wen-Te Chang and Robert Verpoorte
Chemical and Pharmaceutical Bulletin 51(12), 1382-1385 (2003) (http://www.jstage.jst.go.jp/article/cpb/51/12/1382/_pdf)
DOI:10.1248/cpb.51.1382

Abstract
Four ephedrine analogues such as ephedrine, pseudoephedrine, methylephedrine, and methylpseudoephedrine were determined by 1H-NMR from Ephedra species. In the region of ? 5.0—4.0, the signals of H-1 attached to the same carbon with a hydroxyl, were well separated from each other in CDCl3H. The amount of each alkaloid was calculated by the relative ratio of the intensity of H-1 signal to the known amount of internal standard, 200 ?g of anthracene. This method allows rapid determination of the quantity of four ephedrine alkaloids from Ephedra species. The amount of these alkaloids was in the range of 1.0—2.0% of dry weight depending on the plant materials.

mellow:
biotechdude

Don't forget E. equisetina - an excellent plant which grows in temperate climes, resists frost well and produces proflific amounts of ephedrine.

obelisk:
I have done the work on three positively identified north american species and there is not one trace of usable alkaloid present.
  These species centered around northern nevada.

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