methylephedrine/ephedra equisetina

An ultra performance liquid chromatography-mass spectrometric (UPLC-MS) method was developed to investigate the pharmacokinetic properties of ephedrine, methylephedrine, amygdalin, and glycyrrhizic acid after oral gavage of Ma Huang Tang (MHT) in Beagles. Beagle plasma samples were pretreated using

The contents of six Ephedra alkaloids, namely ephedrine, pseudoephedrine, norephedrine, norpseudoephedrine, methylephedrine and methyl-pseudoephedrine, in 12 species of Chinese Ephedra collected in 24 districts were determined by high performance liquid chromatography (HPLC). Zorbax CN column (25 cm

The purpose of this study was to evaluate heart rate and blood pressure responses to a commercially available source of ma-haung, a natural source of the sympathomimetic substance, ephedrine, and to evaluate the pharmacokinetic properties of the product in normotensive, healthy adults. On day 1,

Six Ephedra alkaloids, namely ephedrine, pseudoephedrine, norephedrine, norpseudoephedrine, methylephedrine and methylpseudoephedrine, in 12 species of Chinese Ephedra were successfully separated and determined by gas chromatography with the highly specific and sensitive nitrogen phosphorus detector

Dietary supplements that contain Ma Huang (ephedra alkaloids) and guarana (caffeine) are widely marketed and used in the U.S. for weight loss and athletic performance enhancement, despite a lack of adequate research on the pharmacology of these botanical stimulants. We developed and applied a novel

Dimethyl-beta-cyclodextrin (DM-beta-CD) modified capillary electrophoresis has been developed for chiral separation of ephedrine and related compounds, such as (+/-)-norephedrine, (+/-)-N-methylephedrine, (+/-)-ephedrine and (+)-pseudoephedrine. The influence of some crucial parameters such as

Acute effect of Mao-Bushi-Saishin-To (Ma-Huang-Fu-Zi-Xi-Xin-Tang in Chinese: MBS) on histamine release was investigated. The IgE-mediated anaphylaxic response in Wistar rats was significantly suppressed by MBS and Mao. However, Saishin and Bushi had no or little effect on the antigen-mediated

Our institute serves as a centralized clinical laboratory for municipal and private hospitals in Taipei, a major international metropolis in the Asian region. Two key considerations leading to the development of our toxicology program are: a large number of foreign visitors and local residents

An international collaborative study was conducted of a high-performance liquid chromatography (HPLC)-UV method for the determination of the major (ephedrine [EP] and pseudoephedrine [PS]) and minor (norephedrine [NE], norpseudoephedrine [NP], methylephedrine [ME], and methylpseudoephedrine [MP])

The content of ephedra alkaloids in herbal dietary supplements containing ephedra (ma huang) was studied. The ephedra alkaloid content of 20 ephedra-containing supplements was determined by high-performance liquid chromatography. Contents of (-)-ephedrine, (+)-pseudoephedrine, (-)-methylephedrine,

Ephedra sinica Stapf (Ephedraceae) is a widely used Chinese medicinal plant (Chinese name: Ma Huang). The main active constituents of E. sinica are the unique and taxonomically restricted adrenergic agonists phenylpropylamino alkaloids, also known as ephedrine alkaloids: (1R,2S)-norephedrine

In the present paper, a fast and economical HPLC method [on a Phenomenex Polar-RP column with a solution of (phosphoric acid:triethylamine:dibutylamine:water = 0.40:0.1:0.2:499.3) and methanol] is developed, and applied for the determination of norephedrine, norpseudoephedrine, ephedrine (E),