Enantiomeric ratios of chiral volatile components represent a useful parameter for the assessment of authenticity of essential oils. However often the seasonal variations which occur during ripening of the fruits are quite wide, not yet well determined, thus rendering this tool not completely reliable by itself. Assessment of genuineness is thus often carried out by multiple analytical techniques (physico-chemical analyses, GC, es-GC, HPLC) in order to evaluate sufficient parameters to express a secure judgment. More over if distilled oils are analyzed the enantiomeric ratios are subject to variations due to the possible reactions with consequent tendency to racemization of some chiral volatiles. The carbon isotope ratio on the other hand is strictly dependent on the plant biochemistry, and on the geographical origin. It is not subject to seasonal variation nor to the extraction procedure used. However at this time sufficient data on authenticity ranges for all Citrus oils is not yet available. This study has been carried out on numerous samples of different Citrus essential oils by Es-MDGC, Es-GC and GC-C-IRMS, to determine if the combination of enantiomeric ratios with the carbon isotope ratios can be effective to determine the genuineness of the samples studied.
Multidimensional GC (MDGC) and Carbon Isotope Ratio MS (GC-C-IRMS) for the Authenticity Assessment of Citrus Essential Oils
BONACCORSI, Ivana Lidia;SCIARRONE, Danilo;TRANCHIDA, Peter Quinto;SCHIPILLITI, LUISA;DUGO, Paola;MONDELLO, Luigi
2011-01-01
Abstract
Enantiomeric ratios of chiral volatile components represent a useful parameter for the assessment of authenticity of essential oils. However often the seasonal variations which occur during ripening of the fruits are quite wide, not yet well determined, thus rendering this tool not completely reliable by itself. Assessment of genuineness is thus often carried out by multiple analytical techniques (physico-chemical analyses, GC, es-GC, HPLC) in order to evaluate sufficient parameters to express a secure judgment. More over if distilled oils are analyzed the enantiomeric ratios are subject to variations due to the possible reactions with consequent tendency to racemization of some chiral volatiles. The carbon isotope ratio on the other hand is strictly dependent on the plant biochemistry, and on the geographical origin. It is not subject to seasonal variation nor to the extraction procedure used. However at this time sufficient data on authenticity ranges for all Citrus oils is not yet available. This study has been carried out on numerous samples of different Citrus essential oils by Es-MDGC, Es-GC and GC-C-IRMS, to determine if the combination of enantiomeric ratios with the carbon isotope ratios can be effective to determine the genuineness of the samples studied.Pubblicazioni consigliate
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