Identification of chrysanthenyl esters from the essential oil of Anthemis maritima L. investigated by GC/RI, GC-MS (EI and CI) and ¹³C-NMR spectroscopy: chemical composition and variability
2009
Darriet, Florent | Desjobert, Jean-Marie | Costa, Jean | Muselli, Alain
INTRODUCTION: Anthemis maritima L. (Asteraceae) is a wild plant growing in Corsica and Sardinia. No previous studies of the chemical composition of A. maritima essential oil have been found. The oil contains two series of cis- and trans-chrysanthenyl esters for which the MS data are not present in available libraries and the ¹³C-NMR data are not reported in the literature. The determination of these compounds is a challenging problem since some of these esters are present in low concentrations and they exhibit very similar EI-MS. OBJECTIVE: To develop comprehensive strategies involving integrated techniques including CC, GC/RI, GC-MS (EI and CI), ¹H- and ¹³C-NMR and hemi-synthesis for the identification of both series of chrysanthenyl esters in A. maritima oils. METHODOLOGY: Seventeen oil samples were prepared by hydrodistillation. A fine analysis of a pool of Corsican oils was conducted after repeated CC. A selected Sardinian oil was used as source of product for the hemi-synthesis of chrysanthenyl esters. The identification of these compounds was based on joint information from GC-MS (EI and CI), ¹³C-NMR and hemi-synthesis. RESULTS: Integrated analysis of Corsican and Sardinian oils allowed the identification of 124 components accounting for 83.3-91.6% of the total oil. With the aid of principal component analysis, oil samples could be divided in two groups. Among 16 chrysanthenyl esters identified, 12 were laboratory-synthesised and their ¹³C-NMR data are reported for the first time. CONCLUSIONS: The study illustrates the contribution of integrated techniques for the characterisation of unusual essential oils.
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