AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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Authors: RAMONA MARIA POPA, FLORINELA FETEA, CARMEN SOCACIU.
DOI: 10.24193/subbchem.2021.4.03
Published Online: 2021-12-30
Published Print: 2021-12-30
pp. 33-50
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The Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy was applied for the evaluation of specific patterns for six different essential oils obtained from aromatic plants (thyme, oregano, tea tree) or common spices (clove, cinnamon, juniper). The spectral fingerprints were recorded using a Shimadzu IR Prestige-21 spectrometer in the middle infrared region (3500-650 cm-1) before and after thermal oxidation in hot air. In parallel, the peroxide index, cis-trans isomerization and lipoperoxidation were evaluated to determine their oxidative stability. Each oil showed specific FTIR spectra, especially in the fingerprint region (1650-650 cm-1), in good agreement with our previous GC-MS analysis of the same samples. The spectral patterns in this region were also correlated with their oxidative stability, chemically determined. The spectral data were processed by multivariate analysis (Metaboanalyst 5.0 software) and the discriminatory analysis helped to identify each oil pattern. This study combined the capability of ATR-FTIR-MIR spectroscopy to realize a pattern recognition of essential oils as a rapid and non-destructive method, as well the oxidative modifications, easier than chemical routine tests. This study contributes to the control of quality, authenticity, and safety of essential oils and can be extended to other extracts, used as additives or ingredients in food or cosmetic products.
Keywords: essential oils fingerprinting, Attenuated Total Reflectance Mid Infrared Spectroscopy, thermal oxidation
