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Etude de la composition chimique d'huiles essentielles et d'extraits de menthe de Corse et de Kumquats

Abstract : This study has two objectives, on one hand, contributes to diversify the offer especially in the domain of Plant Perfume Aromatic and Medicine in Corsica by characterising chemical composition of their essential oil and extract. On the other hand, it's to contribute to develop an analytical method for complex natural mixtures based on using 13C NMR spectroscopy without preliminary isolation of components. Analysis of chemical compositions of essential oils (EO) and extracts (micro-wave assisted and hydrolate) of mints growing wild in Corsica and five species from the gender Fortunella has been done by combination of GC(RI), GC/MS and 13C NMR. EO from M. aquatica, M. pulegium and M. suaveolens ssp. suaveolens possesses chemical compositions widely reported in the literature. In contrary, EO from M. suaveolens ssp. suaveolens from the piperitenone chemotype (73.5 %) appears original. In the same way, EO and hydrolate extract (HE) from the insularis subspecies, an endemic species of Corsica and Sardinia, posses an original chemical composition characterized by the association of pulegone (respectively 44.4 and 14.8 %) and cis-cis-p-menthenolide (respectively 27.3 and 67.3 %), a p-menthane -methylene--butyrolactone described for the first time as a natural product. If botanical differentiation of both sub-species (suaveolens and insularis) is a complex task., the occurrence (ssp. insularis) and the lack (ssp. suaveolens) of cis-cis-p-menthenolide in EO permits to deduce the belonging to each subspecies. The chemical composition of their essential oils may be considered as an additional tool to the authentification of botanically close subspecies. EO of fruits from the gender Fortunella are close to EO from the gender Citrus characterized by high contents of limonene (> 90%).EO, HE and Microwave assisted Extract (ME) of leaves from the gender Fortunella posses a sesquiterpen rich chemical composition (germacrene D and -elemol). 13C NMR has shown to be a powerful tool to identify unusual compounds like germacra-1(10),5-dien-4-ol, amorph-4-en-10-ol, amorph-4-en-10-ol and trans-guai-6-en-10-ol which added originalities to EO, HE and ME. Determination of chemical composition of EO from fruits, EO and ME from leaves from five species from Fortunella permits to differentiate each species only by their quantitative variation.
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Submitted on : Tuesday, June 28, 2011 - 5:21:26 PM
Last modification on : Monday, March 29, 2021 - 11:58:05 AM
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Sylvain Sutour. Etude de la composition chimique d'huiles essentielles et d'extraits de menthe de Corse et de Kumquats. Chimie. Université de Corse, 2010. Français. ⟨tel-00603340⟩

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