Ephedrine alkaloids-free Ephedra Herb extract: a safer alternative to ephedra with comparable analgesic, anticancer, and anti-influenza activities

Ephedra/ephedrine: cardiovascular and CNS effects.

Characterization of phenolic constituents from ephedra herb extract.

Nine known compounds: trans-cinnamic acid, catechin, syringin, epicatechin, symplocoside, kaempferol 3-O-rhamnoside 7-O-glucoside, isovitexin 2-O-rhamnoside, herbacetin 7-O-glucoside, and pollenitin B and a new flavonoid glycoside, characterized as herbacetin 7-O-neohesperidoside (1) on the basis of spectroscopic analysis and chemical evidence, were isolated from a traditional crude drug, "Ephe...

The Ephedrine Assay of Chinese Ephedra.*

As set forth in a recent note we have shown that Chinese Ma Huang is obtained from various species of Ephedra, E. eguisetina, Bunge; E. sinica, Stapf ; and E. mahuang, Liu. So far there has been no differentiation made between the various samples of this drug which occur upon the Chinese market. However, irrespective of the possible variation in the drug samples we consider i t is essential tha...

Water potentiates the pressor effect of ephedra alkaloids.

BACKGROUND The use of ephedra alkaloids in over-the-counter preparations has been associated with potentially serious cerebrovascular events. Because of its potential association with hemorrhagic strokes, phenylpropanolamine has been largely substituted for by pseudoephedrine, but it is not clear whether this is indeed a safer alternative. It would be important to understand the cardiovascular ...

Separation and determination of ephedrine alkaloids and tetramethylpyrazine in Ephedra sinica Stapf by gas chromatography-mass spectrometry.

A simple, sensitive, and reliable method using gas chromatography (GC)-mass spectrometry (MS) is developed for the simultaneous determination of ephedrine alkaloids and 2,3,5,6-tetramethylpyrazine (TMP) in Ephedra sinica Stapf. The sample is extracted with ethyl ether and submitted to GC-MS for identification and quantitation without derivatization. The column used for GC is an HP-5 (30.0 m x 2...