Antioxidant activity of <i>Rubus buschii</i> (Rosaceae), <i>Ribes× nidigrolaria</i> (Grossulariaceae) and <i>Sambucus nigra</i> (Caprifoliaceae) and potassium and sod

The article presents the results of a study of the component and element composition of extracts from leaves and fruits of red raspberry (Rubus buschii (Rozanova) Grossh., Rosaceae) (village of Surkh-Digora, city of Vladikavkaz), jostaberry (Ribes× nidigrolaria Rud. Bauer et A. Bauer, Grossulariaceae) (city of Vladikavkaz), and black elderberry (Sambucus nigra L., Caprifoliaceae) (village Tarskoye) growing in the Republic of North Ossetia-Alania in the highlands, midlands and foothills of the Central Caucasus. Flavonoids were isolated, identified and quantified in plant raw materials. It was highest content of flavonoids was found in green parts of plants. For the total content of flavonoids in the plant material (in terms of rutin) the following pattern was revealed: raspberry leaf (Surkh-Digora village) > jostaberry leaf (Vladikavkaz) > black elderberry fruits (Tara swamp). The content of K+ and Na+ in the soil, green parts and fruits of the studied samples depends on the habitat and determines the biological value of the studied species.