ANTIMICROBIAL AND ANTIRADICAL ACTIVITY OF INDIVIDUAL FRACTIONS OF ESSENTIAL OIL FROM SEEDS OF HERACLEUM DISSECTUM LEDEB. OF SIBERIAN REGION

By the method of exhaustive hydroponically obtained essential oil from beans of Heracleum dissectum Ledeb., growing in the Krasnoyarsk region. Separate fractions of oil were obtained: the first after 45 minutes from the beginning of distillation, the second – after 2 hours, the third-after 5 hours, the fourth fraction was collected after the end of hydro-distillation. The component composition of both whole essential oil and its separate fractions was studied. The main components are octyl acetate (60.0%), octyl-2-methylpropanoate (10.2%), n-hexyl-2-methylbutanoate (9.0%). The main amount of octyl acetate (64.7%) is concentrated in the first fraction of the oil. The antimicrobial activity of various fractions of essential oil of borscht dissected against strains of opportunistic microorganisms: Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumoniae, Staphylococcus aureus 209p, MRSA, Proteus vulgaris. It was found that, depending on the duration of isolation, the antimicrobial activity of essential oil fractions in relation to Staphylococcus aureus 209p, MRSA and Pseudomonas aeruginosa decreases, and in relation to Escherichia coli, Klebsiella pneumoniae and Proteus vulgaris increases. The most pronounced inhibitory effect of the third and fourth fractions of essential oil against Klebsiella pneumonia. The antiradical activity of all studied samples of borscht essential oil dissected in reaction with stable free 2,2-diphenyl-1-picrylhydrazyl radical was established. The first fraction showed minimal antiradical activity (15.1%), the fourth – maximum (49.2%).

A New Coumarin from the Roots of Heracleum dissectum

A new coumarin with a ferulic acid moiety (1), together with three known coumarins, viz. isoscopletin-6-O- β-D-glucopyranoside (2), elebutheroside B1 (3), tert-O- β-D-glucopyranosyl-(R)-heraclenol (4), were isolated from the roots of Heracleum dissectum. Their structures were clarified by extensive spectroscopic data analysis including 1D and 2D NMR and HRESI MS and comparison with previous literatures (known compounds). Moreover, the absolute configuration of the new compound was also determined.