Ephedrine-type alkaloid content of nutritional supplements containing Ephedra sinica (Ma-huang) as determined by high
B J Gurley1, P Wang, S F Gardner
1Department of Pharmaceutics, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock 72205, USA.
Abstract:
Nutritional supplements containing Ephedra sinica (ma-huang), a botanical source of ephedrine-type alkaloids, have been linked to numerous episodes of ephedrine (EPH) toxicity. With passage of the 1994 Dietary Supplement Health and Education Act, nutritional supplements are no longer subject to the same FDA preapproval requirements as food additives, prescription, or nonprescription medications. As a consequence, EPH content is not a label requirement for Ephedra-containing supplements. Less stringent labeling requirements, therefore, may contribute to toxicity associated with these products. A validated HPLC method for the determination of ephedrine-type alkaloids, commonly found in Ephedra supplements, is presented. Nine commercially available supplements exhibited considerable variability in alkaloid content (EPH range: 1.08-13.54 mg). Only three products listed EPH content on the label while one exhibited lot to lot variations in EPH of 137%.
More Related Videos
09:10An Efficient and Rapid HPLC-QQQ-MS Method for the Quantitation of Tropane Alkaloids in Medicinal Plants
Published on: June 12, 2026
07:45Technical Approach for Structural Analysis of an Unknown Compound in Huoxiang Zhengqi Oral Liquid based on Linear Ion Trap Mass Spectrometry
Published on: April 3, 2026
Related Concept Videos
01:28Adrenergic Agonists: Mixed-Action Agents
Ephedrine and pseudoephedrine lack a catecholamine group, making them less susceptible to degradation by metabolic enzymes. They have increased oral bioavailability and lipophilicity, resulting in a longer duration of action. Their response is reduced by...
01:16Adrenergic Agonists: Chemistry and Structure-Activity Relationship
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of the aromatic...