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methylephedrine/ephedra sinica
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13 resultados
[Determination of six Ephedra alkaloids in Chinese Ephedra (Ma Huang) by gas chromatography].
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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
[Quality evaluation of twelve species of Chinese Ephedra (ma huang)].
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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
Composition and stereochemistry of ephedrine alkaloids accumulation in Ephedra sinica Stapf.
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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
Chemical constituents of the stems of Ephedra sinica.
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A new naphthalene derivative, 1-methyl-2,3-methylenedioxy-6-naphthalenecarboxylic acid methyl ester (1), and a new alkaloid, ( +/- )-1-phenyl-2-imido-1-propanol (2), together with the four known compounds, ephedrine, pseudoephedrine, N-methylephedrine, and 6-methoxykynurenic acid, have been isolated
Pharmacokinetics and cardiovascular effects of ma-huang (Ephedra sinica) in normotensive adults.
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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,
[Pharmacokinetics of compatible effective components of Mahuang Decoction in febrile rats].
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In the present paper,after the febrile rat model was prepared by injecting yeast,orthogonally compatible effective components from prescription drugs of Mahuang Decoction( Ephedra sinica total alkaloids,Cinnamomum cassia essential oil,amygdalin,Glycyrrhiza uralensis total flavonoids+G. uralensis
Determination of ephedrine alkaloids in botanicals and dietary supplements by HPLC-UV: collaborative study.
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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])
Liquid chromatography-particle beam electron ionization mass spectrometry method for analysis of botanical extracts: evaluation of ephedrine alkaloids in standard reference materials.
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The preliminary validation of a high-performance liquid chromatography particle beam mass spectrometry method (HPLC-PB/MS) with electron impact ionization source for analysis of botanical extracts is presented. The LC-PB/MS system was evaluated for the analysis of ephedrine alkaloids using
Field-amplified sample injection in capillary electrophoresis with amperometric detection for the ultratrace analysis of diastereomeric ephedrine alkaloids.
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A coupling method of field-amplified sample injection (FASI) CE with amperometric detection is developed for ultratrace analysis of ephedrine alkaloids stereoisomers. FASI was introduced by injecting electrokinetically the sample solution for 10 s into the capillary filled with highly conductive
Content versus label claims in ephedra-containing dietary supplements.
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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,
Comparison of the contents of kampo decoctions containing ephedra herb when prepared simply or by re-boiling according to the traditional theory.
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Herbal formulas containing ephedra herb (mao-zai) are among the most important medicinal prescriptions in Japanese traditional kampo medicine to treat cold symptoms, bronchial asthma, arthralgia, and rheumatism. Shokan-zatsubyo-ron (Shanghan zabing lun in Chinese), a classical textbook of kampo
A comparative study of commercial samples of ephedrae herba.
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A total of 22 commercial Ephedra herba samples which belonged to EPHEDRA SINICA, E. INTERMEDIA, E. EQUISETINA, and E. DISTACHYA, respectively, were collected from the Taiwan herbal market. The contents of the six ephedrine alkaloids - ephedrine (E), pseudoephedrine (PE), methylephedrine (ME),
Pharmacokinetic comparisons of five ephedrine alkaloids following oral administration of four different Mahuang-Guizhi herb-pair aqueous extracts ratios in rats.
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BACKGROUND
Herba Ephedra (Mahuang in Chinese), is derived from dried Ephedra sinica Stapf stems and has been widely used to treat the common cold, coughs, asthma, and edema for thousands of years. The Mahuang-Guizhi herb-pair is a famous formula composed of Mahuang and Ramulus Cinnamomi (Guizhi in
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