EO samples were analyzed via gas chromatography-mass spectrometry (GC-MS) to determine composition and main constituents. EOs were diluted in hexane (CHROMASOLV, >98.5% purity, Sigma-Aldrich, St. Louis, MO, USA) at the concentration of 50 ng/μL. Samples were analyzed using a Scion 456 Gas Chromatograph-Single Quad (GC-MS; SCION Instruments UK Ltd., Livingston, UK). A non-polar capillary column Rxi®-5silms (30 m × 0.25 mm, film thickness 0.25 mm; Restek Corporation, State College, PA, USA) linked to a Bruker mass spectrometer (Bruker Daltonics Ltd., Coventry, UK) was used for analysis. Samples underwent splitless injection and the oven temperature was programmed for 5 min at 50 °C then increased to 186 °C at 8 °C/min, and then increased to 280 °C at 30 °C/min held for 5 min. Both the injector and transfer line were maintained at 250 °C. Helium was used as a carrier gas. Compounds were identified using analytical standards and NIST Mass Spectral Search Program for the NIST/EPA/NIH Mass Spectral Library version 2.0 g 2011 (Scion Instruments UK Ltd., Livingston, West Lothian, UK).

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