COMPONENT COMPOSITIONS OF THE ESSENTIAL OIL AND PHENOLIC COMPOUNDS OF THE AERIAL PART OF LOPHANTHUS SCHTSCHUROVSKIANUS
UDK 615.322:547.913
Abstract
The component composition of the essential oil (EO) obtained by hydrodistillation from the air dried aerial part of the Lophanthus schtschurowskianus (Regel) Lipsky, growing in the Surkhandarya region of the Republic of Uzbekistan, was studied. By the GC-MS method were identified 57 components in the composition of EO, which was 93.8% of the total amount of oil, of which 52 volatile compounds were identified. The main components of the essential oil were 1,8-cineol (13.4%), viridiflorol (8.5%), α-terpineol (4.3%), terpinen-4-ol (4.2%), τ-cadinol (4.1%), β-spatulenol (3.9%), α-p-dimethylstyrene (2.1%). Oxygenated monoterpenes (33.6%) and oxygenated sesquiterpenes (24.7%) predominate in the composition of the essential oil; compounds related to sesquiterpene hydrocarbons (8.6%) were also found. The composition of the EO components of L. schtschurowskianus significantly differs from the EOs of other studied plant species of the genus Lophanthus.
The antibacterial and antifungal activity of the essential oil, as well as various extracts from the aerial parts of L. schtschurowskianus, was studied using a modified agar diffusion method. Gram-positive bacteria were found to be susceptible to all the studied samples. Among the studied samples, the essential oil showed the highest antibacterial activity against Bacillus subtilis, Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli.
Three individual phenolic compounds were isolated from various fractions of a 75% alcoholic extract of the aerial part of L. schtschurowskianus, which, based on the study of 1H, 13C NMR, HSQC and HMBC spectra, were identified as caffeic, rosmarinic acids and luteolin.
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