Terpenoid composition and antibacterial activity of the essential oil from Inula cappa (Buch-Ham. ex. D. Don) DC

Abstract

The essential oil from Inula cappa (Buch-Ham. ex. D. Don) DC (Asteraceae), growing wild in the central Himalayan region (India), was analyzed by capillary GC and GC-MS. The sesquiterpene hydrocarbons constituted almost 50% of the oil. Total fifty-four constituents were identified which represented 90.2% of the oil. β-Caryophyllene (27.5%), cis-dihydro-mayurone (6.7%), β-bisabolene (6.5%) and (E)-β-farnesene (5.6%) were found to be the principal constituents. The oil was tested against ten bacterial strains and showed significant activity against Enterococcus faecalis, Klebsiella pneumoniae, Xanthomonas phaseoli, and Bacillus subtilis. This is the first report of bioactivity and essential oil composition from I. cappa.

Keywords:

• Inula cappa
• Asteraceae
• essential oil composition
• β-caryophyllene
• cis-dihydro mayurone
• antibacterial activity

Acknowledgments

We are thankful to Prof. YPS Pangtey, Kumaun University, Nainital and BSI, Dehradun for the identification of plant specimen; and Dr. Vasu Dev, Professor Emeritus, California State Polytechnic University, Pomona, CA, USA for GC/MS analysis. RP is grateful to UGC, New Delhi (2061010427/2010/EU-IV), for the fellowship.

Disclosure statement

No potential conflict of interest was reported by the authors.