The article presents the results of studying the chemical composition of the leaves of blue honeysuckle, naturally growing in the southern taiga of the Krasnoyarsk Territory. It was found that along with fiber and lignin, the studied biomass contains a significant amount (about 70 wt. %) of extractive substances. Using fractional extraction with solvents of increasing polarity, it was possible to extract from the studied raw materials 9.5 wt.% of substances soluble in non-polar solvents and about 60 wt.% of compounds soluble in isopropanol and water. A spectrophotometric study showed the presence in the leaves of blue honeysuckle (Lonicera caerulea L.) such classes of biologically active compounds that provide a wide range of pharmacological action of the plant, such as chlorophyll-containing derivatives, a complex of bioflavonoids, carbohydrate components, anthocyanins, tannins, organic acids and others. This circumstance opens up broad prospects for the practical usage of the biomass under study in the production of food additives, pharmaceutical and perfumery and cosmetic preparations.
The article presents the results of studying the antibacterial activity of fir tree and Siberian spruce bark water extracts. As test objects, pathogenic (3-4 hazard class) and saprotrophic bacteria were used. It has been shown that the studied aqueous extracts of dark-coniferous bark do not exhibit biocide activity against the conditionally pathogenic bacterium Escherichia coli. However, all the other studied bacteria are sensitive to the extracts analyzed both on day 3 and day 13. At the same time, the aqueous extract of the Siberian fir bark has a higher biocide activity against conditionally pathogenic and saprotrophic bacteria in comparison with the aqueous extract of the Siberian spruce bark. The antibacterial activity of aqueous extracts of the studied plants bark is determined by their chemical composition, primarily the presence of substances of a phenolic nature. It has been shown that the studied extracts mainly contain compounds of quercetin, dihydroquercetin and kaempferol.
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