Supercritical fluid extraction of wheat bran oil: Study of extraction yield and oil quality

摘要

The supercritical fluid extraction (SFE) of wheat bran oil with pure supercritical carbon dioxide atuddifferent extraction pressures (25, 40, and 55 MPa) and temperatures (40, 70, and 95°C) has beenudstudied. Since wheat bran contains important bioactive compounds such as alkylresorcinols (AR) andudother phenolic compounds, the content of these compounds in the extracted oil was evaluated in order toudestablish oil quality. The influence of extraction pressure and temperature and wheat bran moisture onudthe extraction yield and oil quality was studied. Oil quality was evaluated through parameters such as ARudcontent and profile, total polyphenols index (TPI), antioxidant activity, and fatty acids profile. SFEudperformed over fresh wheat bran at 55MPa and 95°C was found to provide wheat bran oil with the highestudAR and phenolic content and antioxidant capacity of all the runs performed in this work. Some SFEudexperiments focused on oil fractionation showed that this technique can provide oil fractions enrichedudwith AR and phenolic compounds.