Wheat germ oil extracted by supercritical carbon dioxide with ethanol: Fatty acid composition


  • B. Parczewska-Plesnar Department of Chemistry, Faculty of Food Sciences, Warsaw University of Life Sciences
  • R. Brzozowski Industrial Chemistry Research Institute
  • H. Gwardiak Industrial Chemistry Research Institute
  • E. Białecka-Florjańczyk Department of Chemistry, Faculty of Food Sciences, Warsaw University of Life Sciences
  • Z. Bujnowski Industrial Chemistry Research Institute




Entrainer, Extraction, Polyunsaturated fatty acids, Supercritical CO2, Wheat germ oil


In this work, supercritical fluid extraction (SFE) using CO2 with ethanol as entrainer was performed at a temperature of 40 oC under a pressure of 21 MPa. For comparison, a similar extraction without the entrainer was carried out. The extraction yield of wheat germ using supercritical CO2 with ethanol was slightly higher (10.7 wt%) than that of extraction without the entrainer (9.9 wt%). Fractions of SFE extracts were collected separately during the experiments and the composition of fatty acids in each fraction was analyzed. The SFE extracted oils were rich (63.4-71.3%) in the most valuable polyunsaturated fatty acids (PUFA) and their content in all collected fractions was approximately constant. Similar PUFA contents were found in the reference samples of oils extracted by n-hexane (66.2-67.0%), while the commercial cold-pressed oil contained significantly less PUFA (60.2%). These results show a higher nutritional value of the oil obtained by extraction with supercritical CO2 than cold pressed oil which is generally considered to be very valuable.


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How to Cite

Parczewska-Plesnar B, Brzozowski R, Gwardiak H, Białecka-Florjańczyk E, Bujnowski Z. Wheat germ oil extracted by supercritical carbon dioxide with ethanol: Fatty acid composition. Grasas aceites [Internet]. 2016Sep.30 [cited 2024May29];67(3):e144. Available from: https://grasasyaceites.revistas.csic.es/index.php/grasasyaceites/article/view/1610