Supercritical fluid extraction of wormwood (Artemisia absinthium L.) |
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Authors: | L MartínAM Mainar A González-ColomaJ Burillo JS Urieta |
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Affiliation: | a Group of Applied Thermodynamics and Surfaces (GATHERS), I3A (Aragón Institute of Engineering Research), Universidad de Zaragoza, C/ Pedro Cerbuna 12, Zaragoza 50009, Spain b CSIC, Centro de Ciencias Medioambientales, Instituto de Ciencias Agrarias, C/Serrano 115-bis, Madrid 28006, Spain c Centro de Investigación y Tecnología Agroalimentaria de Aragón (CITA), Avda. Montañana 930, Zaragoza 50059, Spain |
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Abstract: | The objective of the work was to optimize the extraction of wormwood oil by supercritical fluid extraction (SFE) of growth-controlled plant material. Different extraction conditions, two growth techniques and various crops were tested and the evolution of the extracted oil composition was screened chromatographically. A comparison with conventional techniques such as hydrodistillation (HD) or organic solvent extraction (OSE) was also presented. Particularly, six CO2 densities ranging from 285.0 kg/m3 to 819.5 kg/m3 were studied in the range of 9.0-18.0 MPa and 40-50 °C. A systematic study was carried out with plant material from 2005, while SFE of 2006, 2008 and aeroponically grown crops was performed for comparative purposes. The effect of ethanol as a modifier of the supercritical fluid extraction was also studied. The major compounds found in the SFE extracts as well as in the HD essential oils were Z-epoxyocimene, chrysanthenol and chrysanthenyl acetate. A model based on mass transfer equations, the Sovová model, was successfully applied to correlate the experimental data. |
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Keywords: | Artemisia absinthium L Supercritical fluid extraction Sovová model Hydrodistillation Organic solvent extraction |
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