DETERMINATION OF THE CONTENT OF POLYPHENOL COMPONENTS, ANTIOXIDANT AND ANTIRADICAL ACTIVITY OF ETHANOL EXTRACTS OF THE PLANT KOENIGIA WEYRICHII GROWING ON THE KOLA PENIN-SULA

Flavonoids are valuable polyphenolic compounds that accumulate in plants and have various biological activities. Koenigia Weyrichii (F. Schmidt) T.M. Schust. et Reveal is one of the plants with high flavonoid content in aerial parts. The aim of this work is to compare the total content of polyphenols, flavonoids, the total antioxidant and antiradical activity of ethanol extracts obtained from different parts of the K. Weyrichii plant growing in the Arctic zone of Russia, to compare the efficiency of ultrasonic extraction and maceration, and to determine the optimal extraction conditions. The determination of the total content of polyphenolic components was carried out using the Folin-Chocalteu reagent, the total content of flavonoids - using the complexation reaction with aluminum chloride, the total antioxidant activity - using the phosphomolybdate method, and the free radical scavenging - in the reaction with 2,2-diphenyl-1-picrylhydrazyl (DPPH). An increased yield of flavonoids is observed when maceration is used. According to the data on the total content of flavonoids, the optimal conditions for maceration (time and ratio of the components of the water-ethanol mixture) were determined. K. Weyrichii can be considered as a promising source of flavonoids and cultivated in the Arctic for further use.