Abstract:

Supercritical CO2 fluid was used to extract rice bran oil. The effects of five major extraction parameters such as extraction pressure, extraction temperature, extraction time, granularity of material and amount of modifier (absolute ethanol) on yield of rice bran oil and recovery of linoleic acid (LA) were evaluated using a L16(45 ) orthogonal array design in which the interactive effects among the parameters were neglected temporarily, and qualitative and quantitative analysis linoleic acid in rice bran oil were carried out by gas chromatography (GC). A total amount of 17.53 g oil was obtained from 100 g rice bran with an extraction recovery of LA of 87.24% by the 100 min extraction at 35 MPa and 40 ℃ with a granularity of material of 0.450 mm and 8% addition of absolute ethanol. The major fatty acids in rice bran oil were oleic acid (OA) accounting for 41.52% and LA 40.81%. The product had pure flavor and orange color, and is homogeneous and rich in LA and therefore it can be used as functional oil.

Key words: rice bran oil, supercritical fluid extraction, linoleic acid, function