The combined analysis of a commercial sample of Helichrysum faradifani Sc. Ell. essential oil from Madagascar, using column chromatography, GC-RI, GC-MS and 13C-NMR, led to the identification of 47 components. The main constituents were α-fenchene (32.3%), γ-curcumene (19.4%), (E)-β-caryophyllene (14.2%), α-curcumene (2.9%), limonene (2.8%), lavandulyl acetate (2.1%) and α-fenchene hydrate (1.7%). The composition of this sample was quite different from that of a laboratory-distilled sample previously reported by our group. Moreover, none of the compositions reported in the literature for other Helichrysum oils exhibited a high content of α-fenchene. 13C-NMR data for exo-α-fenchene hydrate are reported.
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Cavalli et al. (2005) studied this question.
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