This work focused on the extraction of rice bran oil using supercritical carbon dioxide (SC-CO2) and
compressed liquefied petroleum gas (LPG). For the supercritical extractions, the influence of pressure and
temperature on the extraction yield was evaluated from 150 to 250 bar and from 40 to 80 C, whereas for
compressed LPG extractions were performed at 5 e25 bar and 20 e40 C. The antioxidant activity of the
extracts was assayed by DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging method and the
chemical composition by gas chromatography-mass spectrometry (GC eMS). The highest yields were
12.68 and 12.07 wt%, whereas the maximum antioxidant activities were 71.67 and 67.49% for extraction
using SC-CO2 and compressed LPG, respectively. The chemical profile of fatty acids was similar for both
solvents. The antioxidant compound found in both processes was the b-sitosterol, which is one of the
components of g-oryzanol. From kinetics analysis it was demonstrated that using LPG it is possible to
decrease the solvent/feed mass by a factor of approximately 30, and extraction time by a factor of 15.
Considering the slight difference in the yield and antioxidant activities of extracts between the solvents,
compressed LPG is a more promising solvent than supercritical CO2 for extraction of rice bran oil, since
the extraction period can be considerably reduced while lowering the energy required for solvent
recompression.