The standard compounds used for the GC analysis were thymol, trans-anethol, (+)-borneol, (−)-borneol, α-terpineol, L-carvone, (R)-(+)-limonene, eucalyptol, farnesol, neryl acetate, (±)-citronellal, citral, γ-terpinene, nerol, α-pinene, p-cymene, (−)-trans-caryophyllene, geraniol, geranyl acetate, carvacrol, eugenol, sabinene hydrate, bornyl acetate, linalyl acetate, myrcene and (±)-camphor and were purchased from Sigma-Aldrich (St. Louis, MO, USA). In addition, 1,1-Diphenyl-2-picryl-hydrazyl-hydrate (DPPH∙) was obtained from Sigma-Aldrich GmbH (Germany). All chemicals and solvents were analytical reagent grade.
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