Phytochemical study of phenolic compounds of labrador tea (Lédum palústre L.)
DOI:
https://doi.org/10.15587/2313-8416.2015.54483Keywords:
Labrador Tea, sesquiterpene alcohols, coumarins, flavonoids, aglycones, catechins, hydroxycinnamic acidAbstract
Aim. This work is devoted a phytochemical study of biologically active substances in herb of Labrador Tea (Lédum palústre L.), as well as investigation of the possibility of complex use of raw materials in order to create on its basis new herbal medicines.
Methods. The object of the study served as the herb Labrador Tea. Separation of isolated substances was performed by adsorption and partition chromatography on various adsorbents. The structure of the isolated compounds was determined based on physicochemical methods: paper (PC) and the thin layer (TLC) chromatography, UV, IR and NMR spectroscopy in comparison with the original valid standards of flavonoids. Acid hydrolys was used for the determination of the flavonoid aglycone composition. The content of total flavonoids was determined by differential spectrophotometry at a wavelength of 412 nm from the reaction with aluminum chloride based on the hyperoside-standard (Ukrainian scientific Pharmacopoeial center for quality of medicines (Pharmacopoeial center), Kharkоv).
Results. During this study we found more than 40 of phenolic compounds and identified 31compounds. The phytochemical analysis showed the presence of flavonols (11 compounds), catechins (5). Hydroxycinnamic acids represented by caffeic, ferulic, chlorogenic acids. Besides that, it were found phenolic glycoside arbutin, coumarins - coumarin, umbelliferon, scopoletin, esculetin and esculin, tannins – metyl gallate, pyrogallol.
Conclusions. The following biologically active substances were defined for the first time: flavonoids – 5-methyl-kaempferol, avicularin, polistahozid, quercitrin; coumarins – esculetin, esculin; as well as hydroxycinnamic acids – ferulic, chlorogenic, neochlorogenic of Labrador Tea. The obtained data justify the prospectivefor creation of new and effective herbal medicines from Labrador Tea
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