Chromatographic Determination of Iridoids in Stachys recta, and Investigation of Inorganic Elements by X-Ray Fluorescence Spectroscopy

摘要

We have isolated five iridoids (harpagide, acetylharpagide, harpagoside, ajugoside, and aucubin) from St recta L. by a combination of chromatographic methods - NP-TLC, RP-HPLC, and TLC-densitometry. The isolated iridoids were identified on the basis of their physical and spectroscopic properties. Basic information about their structures was obtained from their NMR spectra. X-ray fluorescence spectroscopy can be used for direct determination of inorganic elements in the leaves, stems, and inflorescences of Stachys recta L. We identified K, Ca, Mo, Fe, Co, Ir, Ga, Tl, and S.