The volatile components of Ferulago nodosa (L.) Boiss. were obtained by simultaneous steam-distillation extraction (SDE), and supercritical-fluid extraction (SFE). Gas chromatographic analyses showed different qualitative and quantitative profiles between the oils obtained by the two different procedures. The product of SDE contained several aromatic components, including the main compound 2,3,4-trimethylbenzaldehyde (42.2%), which were artefacts formed by thermolysis of a non-volatile monoterpenoid compound present in the plant. However, SFE gave primarily α-pinene (55.4%), myrcene (10.1%), cis-β-ocimene (7.0%), β-phellandrene (5.6%) and sabinene (4.5%)
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Ruberto et al. (1999) studied this question.
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