PHENOLIC COMPOUNDS AND IRIDOIDS OF THE AERIAL PART OF LEONURUS DEMINUTUS V. KRECZ. (LA-MIACEAE)

Abstract

In the Siberian region, the genus Leonurus is represented by 7 species, in the territory of the Irkutsk region Leonurus deminutus V. Krecz. is widespread. This plant is used in folk medicine in the form of infusion, tincture, juice for anxiety disorders, irritability, insomnia, hypertension and is promising for introduction into pharmaceutical practice. In this regard, the purpose of this study was to study the composition and content of the main biologically active substances (flavonoids, phenylpropanoids and iridoids) of the aerial part of L. deminutus. HPLC-DAD-ESI-MS method was used for the analysis. According to the results of the study, the presence of 20 phenolic compounds in the aerial organs of L. deminutus was determined, of which 11 substances were isolated and identified for the first time: 4-O-Caffeoylquinic acid, 5-O-Caffeoylquinic acid, caffeoylmalic acid (isomer 9), rutin, nicotiflorin, isoquercitrin, leonosides A and B, astragalin, apigenin-5-O-glucoside, genkwanin-5-O-glucoside. The quantitative determination of the established phenolic compounds was carried out by the MC-HPLC-UV method. It was found that in the aerial part of L. deminutus contains amounts of flavonoids in the amount of 13.76 mg/g and phenylpropanoids 75.4 mk/g. The analysis of the iridoid profile of L. deminutus was carried out using the HPLC-DAD-ESI-MS method. For the first time, the following iridoids were discovered and established for the aerial part of L. deminutus: harpagid, the isomer of ayugol, 8-acetylgarpagid and ayugoside. According to the literature, these substances are characteristic of other representatives of the genus Leonurus, which was confirmed by us by comparative analysis of alcohol extracts of L. deminutus and L. cardiaca by TLC.