The aim of this work was to study the content of biologically active compounds in aqueous and ethanol extracts of the roots and rhizomes of elecampane, meadow clover grass and sea buckthorn berries, as well as to determine the indicators of their antioxidant activity. Water extracts were prepared in the form of two dosage forms recommended by the Pharmacopoeia of the Russian Federation -infusion and decoction, differing by the duration of the heat treatment. In the extracts, the amount of antioxidant compounds such as phenolic compounds, flavonoids, carotenoids was estimated, and the content of chlorophylls was also determined in clover extracts. It is shown that 70 vol. % ethanol extracts all detectable compounds more efficiently than water. The largest amount of biologically active substances (except chlorophylls) was extracted from sea buckthorn berries. The restorative power and antiradical activity of the extracts were investigated. It was shown that in the case of each plant separately, ethanol extracts showed a higher reducing power and antiradical activity compared to water. However, when comparing plant extracts with each other, it was found that both ethanol and even water extracts of sea buckthorn berries in these indicators prevailed over ethanol extracts of elecampane and clover.
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