High-performance liquid chromatography with ODS columns has been the most popular technique in analyzing the Chinese herbal drugs. (-)-Ephedrine and (+)-pseudo-ephedrine are the major index components in Ephedrae Herba. In order to separate these two alkaloids, three ODS columns were evaluated. The relationships between SDS concentrations, brands, organic solvent ratios and pli values and retention times of the ephedrine and pseudoephedrine were also studied.
Sheu, S.-J. and Huang, M.-H.
"Separation of the ephedra alkaloids by rplc,"
Journal of Food and Drug Analysis: Vol. 8
, Article 11.
Available at: https://doi.org/10.38212/2224-6614.2824