Characterization of essential oils from Myrtaceae species using ATR-IR vibrational spectroscopy coupled to chemometrics
The essential oils obtained from plants belonging to various Myrtaceae genera (Eucalyptus, Corymbia, Melaleuca, Syzygium, and Eugenia) were analyzed non-destructively by applying Attenuated Total Reflection Infrared (ATR-IR) vibrational spectroscopy. The spectroscopic analysis was based on the key bands of the individual volatile substances using the spectral data of the individual terpenoids, which allowed for the discrimination of different essential oil profiles. The spectroscopic data was compared to Gas Chromatography– Mass Spectroscopy GC–MS) analyses of the oils and results showed high correlation. Additionally, the combination of vibrational spectroscopy and chemometric analyses provided a fast, easy and reliable method for volatilome based classification comparable to that of chromatographic results. These results suggest ATR-IR as a potentially reliable method for identification, classification and quality control purposes of various essential oils.
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