The extraction of essential oil was carried out using two processes: hydrodistillation and supercritical CO2 extraction. The chemical composition of extracted essential oil was determined. The yield of extraction by supercritical CO2 was about 7.8 %. This yield is more important than that obtained by hydrodistillation process (5.51 %). The chemical composition of the supercritical CO2 extract indicates the presence of only two compounds. The major one is undecan-2-one (100 %). The second one is limonene which is present as trace. However, 23 compounds were identified in the essential oil of the aerial part of Ruta chalepensis extracted by hydrodistillation process. The major compound is also undecan-2-one (77.7 %).
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Jamel et al. (2012) studied this question.
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