octadecadienoic-acid and caryophyllene

The chemical compositions of the essential oils obtained from leaves and flowers of Helichrysum pallasii were analyzed by gas chromatography and gas chromatography-mass spectrometry. Among the 102 identified constituents, hexadecanoic acid (16.2%), (Z,Z)-9,12-octadecadienoic acid (6.8%), tetradecanoic acid (2.6%), and (Z)-caryophyllene (4.2%) were the main constituent of the oil from leaves, while in the oil from flowers hexadecanoic acid (14.7%), (Z,Z)-9,12-octadecadienoic acid (14.2%), (Z)-caryophyllene (3.6%), and delta-cadinene (3.1%) predominated. The oils were both characterized by sesquiterpenes (33.4% for leaves and 33.7% for flowers, respectively) and fatty acids and esters (30.3% in leaves and 35% in flowers, respectively). The in vitro activity of the essential oils of the plant against some microorganisms in comparison with chloramphenicol by the broth dilution method was determined. The oils exhibited a weak activity as inhibitors of growth of Staphylococcus epidermidis in vitro (minimum inhibitory concentration = 100 microg/mL).

Topics: Anti-Bacterial Agents; Anti-Inflammatory Agents, Non-Steroidal; Bacteria; Esters; Fatty Acids; Fatty Acids, Unsaturated; Flowers; Helichrysum; Lebanon; Myristic Acid; Oils, Volatile; Palmitic Acid; Plant Extracts; Plant Leaves; Plant Oils; Polycyclic Sesquiterpenes; Sesquiterpenes; Staphylococcus epidermidis