Compounds were identified by first comparing their mass spectra
with those contained in the NIST/EPA/NIH Mass Spectral Database,
in the collection of essential oil spectra published by Adams
(2001) or in other published literature. Wherever possible authentic
samples of the compounds were obtained and analysed under
similar GC–MS conditions to provide LRI values. Tentative identification
of compounds, which could not be obtained as authentic
samples, were carried out by comparing the spectra and LRI with
those published by Adams (2001) or elsewhere