Effect of Subcritical Carbon Dioxide Extraction and Bran Stabilization Methods on Rice Bran Oil

The extraction of rice bran oil using the conventional organic solvent-based Soxhlet method involves hazardous chemicals, whereas supercritical fluid extraction is a costly high-temperature operating system. The subcritical carbon dioxide Soxhlet (SCDS) system, which operates at a low temperature, w...

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Bibliographic Details
Published in:Journal of the American Oil Chemists' Society 2015-03, Vol.92 (3), p.393-402
Main Authors: Chia, S. L, Boo, H. C, Muhamad, K, Sulaiman, R, Umanan, F, Chong, G. H
Format: Article
Language:English
Subjects:
Agriculture
Biomaterials
Biotechnology
Carbon dioxide
Carbon dioxide extraction
Chemistry
Chemistry and Materials Science
Extraction processes
fatty acid composition
Food Science
free fatty acids
hexane
Industrial Chemistry/Chemical Engineering
Oils & fats
Original Paper
oryzanol
peroxide value
Rice
rice bran
Rice bran oil
Stabilization
supercritical fluid extraction
temperature
Tocopherols
Tocotrienols
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Summary:The extraction of rice bran oil using the conventional organic solvent-based Soxhlet method involves hazardous chemicals, whereas supercritical fluid extraction is a costly high-temperature operating system. The subcritical carbon dioxide Soxhlet (SCDS) system, which operates at a low temperature, was evaluated for the extraction of rice bran oil in this study. In addition, rice bran that had been subjected to steam or hot-air stabilization were compared with unstabilized rice bran (control). The yields; contents of tocopherols, tocotrienols and oryzanol; fatty acid profiles; and the oxidative stabilities of the extracted rice bran oils were analyzed. The yields using hexane and SCDS extraction were approximately 22 and 13–14.5 %, respectively. However, oil extracted using the SCDS system contained approximately 10 times more oryzanol and tocol compounds and had lower free fatty acid levels and peroxide values compared with hexane-extracted oil. Overall, SCDS extraction of steamed rice bran represents a promising method to produce premium-quality rice bran oil.
ISSN:0003-021X
1558-9331
DOI:10.1007/s11746-015-2596-5