Studied the content the content of phenolic compounds (flavonols, flavans (catechins), tannins), polysaccharides (pectins, protopectins), tetraterpenes (carotenoids) and antioxidant activity of Cichorium intubus L., Taraxacum officinale Wigg., Arnica iljinii (Maguire) Iljin., Echinops sphaerocephalus L. cultivated in conditions of Western Siberia. A significant part of the biologically active substances are tannins (up 28.25%) and protopectins (up 11.11%). The content of flavonoids in the studied samples of C. intybus plants corresponds to the indicators of chicory grass for other regions of the Russian Federation, including the regions of its industrial cultivation. The flowers and leaves of the studied samples of T. officinale are characterized by approximately the same content of flavonols (1.02–1.43%), pectins (0.80–1.08%) and protopectins (7.94–8.87%). The leaves and flowers of A. iljinii are distinguished by a rather high content of flavonols (up to 4.23%) and tannins (up to 28.25%). In terms of the content of tannins (8.34%), catechins (36.3 mg/%), protopectins (10.06%) and carotenoids (64.60 mg/%), the leaves of E. sphaerocephalus are significantly superior to the flowers. Flavonols are present in equal proportions in leaves (0.68%) and flowers (0.64%). Indicators of the total content of phenolic antioxidants in the leaves and flowers of C. intubus, T. officinale, A. iljinii, E. sphaerocephalus do not differ significantly.

The article presents Dara on the content of biologically active compounds (BAC) and the total phenolic antioxidants activity (TPA) evaluated for leaves and inflorescences of eight species from the Rosaceae family: Padus avium, Malus baccata, Alhemilla vulgaris, Potentilla inquinans, Filipendula vulgaris, F. palmata, Sanguisorba officinalis, S. alpina. It was determined that leaves and inflorescences contain flavonols, catechins, tannins, carotenoids, saponins, pectin substances. Usually, woody plants tend to accumulate less BAC and TPA than herbs. The highest level of flavonols and tannins was registered in inflorescences of F. vulgaris (12.25% and 45.02 %). The content of pectin substances was quite high, with the biggest share of protopectins (4.4-10.65%). The maximum quantity of catechins (4.76%) was found in the leaves of F. palmata, saponins – in the inflorescences of M. baccata (20.77%). The highest content of carotenoids was found in the leaves of plants, most notably in P. inquinans (1.00 mg/g). The highest antioxidant activity was recorded for water-ethanol extracts from inflorescences (up to 7.77 mg/g) and leaves (2.11 mg/g) of F. vulgaris and A. vulgaris plants due to increased content of phenolic compounds, in particular flavonols and tannins, compared to the other species.

The content of biologically active substances and antioxidant activity in leaves and inflorescences of three species from the tribe Cynareae of the Asteraceae family: Centaurea cyanus,Centaurea macrocephala, Rhaponticum carthamoides, grown under the conditions of the Central Siberian Botanical Garden introduction was studied. It was determined that leaves and inflorescences contain flavonols, catechins, tannins, carotenoids, pectin substances. The highest level of tannins (up to 27.7%) in leaves and flavonols in leaves and inflorescences (up to 4.93 %) was found in plants of R. carthamoides. High content of catechins (up to 140.2 mg%) was found in leaves and inflorescences of C. macrocephala. Carotenoids are mainly accumulated in leaves of R. carthamoides (51.73 mg%) and inflorescences of C. macrocephala (11.86 mg%). The highest content of pectins was noted in leaves and inflorescences of C. cyanus (1.7% and 2.6%), protopectins - in leaves (up to 10.54 %). The highest antioxidant activity (0.72 мг/г) and anti-radical activity (IC50=0.58–0.77 мг/г) were recorded for water-ethanol extracts from leaves and inflorescences of C. macrocephala. Water-ethanol extracts of C. cyanus exhibited low antiradical activity (IC50=4.43–8.13 mg/g).