Extraction of essential oil from Teucrium polium L. using supercritical CO2 at 100 bar and 40°C was performed. The supercritical extraction process was carried out by a pilot plant scale apparatus. Applying GC/MS analysis, the results were compared with those obtained for the oil isolated by conventional hydrodistillation. In both cases, the major components identified were sesquiterpenes. Germacrene D (23.6% and 13.2%) and β-caryophyllene (16.5% and 18.0%) were the main components in the extract and oil, respectively.
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Eikani et al. (1999) studied this question.
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