STUDY OF THE COMPOSITION AND PROPERTIES OF SECONDARY METABOLITES OF THE LICHEN USNEA BARBATA
Abstract
In the modern society value of many biological resources remains underestimated. Lichens are one of the unique poorly studied bioresources. These are amazing organisms, formed by symbiosis of algae and fungus. Due to this combination, lichens have a number of unique properties.
In this article the results of study the composition of biologically active secondary lichen metabolites of the Usnea barbata lichen. Antioxidant activity and antimicrobial properties of dry lichen extract against bacteria Bac. Subtilis. The conditions for extraction of biologically active metabolites using solvent systems such as water, water-ethanol mixtures with ethanol content of 40 and 70%, 1,4-dioxane and a mixture of 1,4-dioxane and water (1: 1) were selected. With use of the modern analytical methods, the composition of secondary metabolites in the extracts was studied. By the method of spectroscopy in the UV and visible region of the spectrum to determine the content usnic acid, which is 16,2 (solvent - water) to 60,0 (1,4-dioxane) mg/100 ml of extract.
It is shown that the dioxane extract has pronounced atioxidant properties. The active substances (in terms of usnic acid) of the dry extract of lichen Usnea barbata are able to inhibit the growth of bacteria Bac. Subtilis.
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