Abstract
Introduction. Inflorescences of Koenigia weyrichii (F. Schmidt) T.M. Schust. et Reveal contains a large amount of flavonoids. However, at present, the most optimal conditions for their extraction by water-ethanol mixtures have not been obtained, and the effect of ultrasound on the extraction pro-cess has not been fully studied. The aim of the study was to optimize the conditions of ultrasonic water-ethanol extraction of secondary metabolites from the inflorescences of K. weyrichii. Material and methods. Optimal extraction conditions have been established using the Box-Behnken algorithm. The total content of polyphenols was determined using the Folin-Ciocalteu method, and flavonoids were determined using a complexation reaction with aluminum chloride. The total antioxi-dant activity was assessed using the phosphomolybdate method. The content of polyphenolic acids was determined by HPLC. The ability of the extract obtained under optimal conditions to inhibit free radicals was determined by DPPH and ABTS methods. Results. The highest yield of the target substances is achieved in 60 minutes of extraction in 50% aqueous ethanol at a temperature of 50 ° C, and mixing plant material with a particle size of 0.1 mm with an solvent in a ratio of 1:10 (mass to volume. It has been shown that ultrasound exposure reduces the yield of target substances. Conclusions. The results of the work are the scientific basis for the development of methods of phytochemical analysis and technologies for the pro-duction of pharmaceuticals based on the studied plant.
Published Version
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