chemical compositions of essential oils from etlingera brevilabrum: a comparative analysis using gc×gc/tofms

In this report, essential oils from the rhizome, stem and leaf of etlingera brevilabrum were isolated using a clevengertype apparatus and subsequently characterized using a comprehensive twodimensional gas chromatography (gc×gc/tofms) approach. regarding the spectral assignments, 77 constituents were totally identified. the rhizome oil contained oxygenated monoterpenes (26.4%) and monoterpene hydrocarbons (25.9%), while the total percentages of these groups in the stem oil were found to be 27.5% and 25.2%, respectively. the leaf oil dominated by monoterpene hydrocarbons (32.4%) and oxygenated monoterpenes (27.3%). the major characterized compounds for the rhizome oil were 1,8-cineole (10.8%) and β-phellandrene (8.8%). the stem oil was mainly composed of 1,8-cineole (12.0%) and β-pinene (8.5%). however, monoterpene hydrocarbons involving β-pinene and α-pinene (8.7% and 5.5%) were identified as the main components in the leaf oil profile.