A comparative study on chemical composition and antibacterial activity of essential oils from the aerial parts and roots of Laportea bulbifera (Siebold & Zucc.) Wedd. growing in the Central Himalayan region

The GC and GC/MS analysis of the essential oil samples obtained separately from whole aerial parts and the roots of Laportea bulbifera resulted in the identification of a total of 40 compounds from the whole aerial parts and 45 compounds from the roots representing 89.7% and 82.9%, respectively, of the total essential oil composition. The essential oil from aerial parts is dominated by oxygenated sesquiterpenes (66.4%) with α-elemol (55.1%), germacrene D-4-ol (4.2%), linalool (3.5%) and phytol (3.4%) as the major constituents while the root essential oil is dominated by oxygenated monoterpenes (30.4%) with trans-myrtanol (16.3%), cis-myrtanol (11.6%), nopinone (7.8%), cadin-4-en-10-ol (4.7%), and α-elemol (3.4%) as major constituents. The essential oil from whole aerial parts showed bactericidal effect at 250 µL/mL concentration (MBC) against Pasteurella multocida and Dickeya dadantii while the root essential oil exhibited bactericidal effect at 125 µL/mL against Escherichia coli, Enterococcus faecalis, Xanthomonas phaseoli, and Dickeya dadantii.