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Chem Biodivers. 2013 Nov;10(11):2061-77. doi: 10.1002/cbdv.201300109.

Chemical variability and antioxidant activity of Limbarda crithmoides L. essential oil from Corsica.

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Université de Corse, UMR CNRS 6134 SPE, Laboratoire Chimie des Produits Naturels, BP 52, F-20250 Corte, (phone: +33-495450171; fax: +33-495450257).


The chemical compositions of 25 Corsican Limbarda crithmoides ssp. longifolia essential oils were investigated for the first time using GC-FID, GC/MS, and NMR analyses. Altogether, 65 compounds were identified, accounting for 90.0-99.3% of the total oil compositions. The main components were p-cymene (1; 15.1-34.6%), 3-methoxy-p-cymenene (4; 11.8-28.5%), 2,5-dimethoxy-p-cymenene (5; 5.9-16.4%), thymol methyl ether (6; 1.3-14.9%), α-phellandrene (2; 0.9-11.9%), and α-pinene (3; 0.2-13.4%). The chemical variability of the Corsican oil samples was studied using multivariate statistical analysis, which allowed the discrimination of two main clusters. A direct correlation between the water salinities of the plant locations and the chemical compositions of the L. crithmoides essential oils was evidenced. Indeed, essential oils rich in 1 (30.4-34.6%) were found in samples growing in the wetlands of the southern oriental coast, which exhibit high salinity levels (24.4±0.2-33.9±0.2 ppt), and essential oils with lower contents of 1 (15.1-27.3%) were isolated form samples growing in the wetlands of northern Corsica, which exhibit lower salinity levels (10.90±0.20-15.47±0.15 ppt). The antioxidant potential of L. crithmoides essential oil was also investigated, by assessing the DPPH(.) - and ABTS(.+) -scavenging activities and the reducing power of ferric ions, and was found to be interesting. Moreover, using bioassay-guided fractionation of the essential oil, a higher antioxidant activity was obtained for the oxygenated fraction and both ester and alcohol subfractions.


Antioxidant activity; Cluster analysis (CA); Essential oils; Limbarda crithmoides; Principal-component analysis (PCA); Salinity; p-Cymenene derivatives

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