mass spectrometries (EESI-MS) [9] have been applied in order to
classify perfumes and identify counterfeit samples. The authors
were able to detect perfume forgery directly from differences in
the mass spectral fingerprints of authentic and counterfeit sam-
ples without resorting to detailed chemical composition analysis.
More recently, an alternative technology has been introduced in
the study of the volatiles by the use of an artificial electronic
olfactory system (EOS) [10–15], because it provides important
advantages such as non-complicated and non-expensive methods,
suitability for real-time, on-line, non-destructive sensing and the
possibility of using a portable instrument. Furthermore, the EOS
sensors do not need reagents and they supply rapid results to
the analyst. However, these sensors offer disadvantages because
of their signal drift, recovery, and humidity and temperature
dependence.