Characterisation of lavender essential oils by using gas chromatography–mass spectrometry with correlation of linear retention indices and comparison with comprehensive two-dimensional gas chromatography
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Abstract
Nine samples of lavender essential oil were analysed by GC-MS using low-polarity and
polar capillary columns. Linear retention indices (LRI) were calculated for each component
detected. Characterisation of the individual components making up the oils was performed
with the use of an mass spectrometry (MS) library developed in-house. The MS library
was designed to incorporate the chromatographic data in the form of linear retention
indices. The MS search routine used linear retention indices as a post-search filter
and identification of the "unknowns" was made more reliable as this approach provided
two independent parameters on which the identification was based. Around 70% of the
total number of components in each sample were reliably characterised. A total of
85 components were identified. Semi-quantitative analysis of the same nine samples
was performed by gas chromatography (GC) with flame ionisation detection (FID). The
identified components accounted for more than 95% of each oil. By comparing the GC-MS
results with the results from the GCxGC-FID analysis of a lavender essential oil,
many more components could be found within the two-dimensional separation space.