Supercritical carbon dioxide extraction of fatty and waxy material from rice bran

Abstract

Waxy and fatty materials were removed from rice bran by supercritical carbon dioxide at pressures up to 28 MPa and temperatures between 40 and 70°C. The yields of the supercritical extraction were only 16–60% of those obtained by Soxhlet extraction with hexane. The highest yield was reached at the highest pressure and temperature used (28 MPa and 70°C), indicating that supercritical extraction of this lipid‐bearing material could probably be improved at more severe extraction conditions. The supercritical extract obtained at operational conditions giving high yield was chromatographically characterized. Compared to the hexane extract, the supercritical extract was lighter in color and richer in wax content and long‐chain fatty acids C20−C34. Triacontanol was the most abundant alcohol in both extracts. Tocopherol contents were similar.

Effects of Extraction Methods on Phytochemicals of Rice Bran Oils Produced from Colored Rice

“…Most studies for the use of SC-CO 2 in lipid extraction have focused on the yield of extractable material. However, each compound possesses a unique extractability under different conditions of supercritical fluid extraction 29 . In addition, current publications indicated high phytochemicals including oryzanol in colored rice especially black rice, similar to HN in this study 30 32 .…”

Application of supercritical CO2 in lipid extraction – A review

“…Garcia et al (1996) reported that most studies of the use of SFE in lipid extraction have focused on the yield of extractable material. In theory, each compound possesses a unique extractability under different conditions of supercritical fluid related to factors such as extraction temperature, pressure, and time.…”

“…SFE of lipids has received attention as an alternative to organic solvent extraction and has been shown to be an ideal method for extracting certain lipids (Garcia et al, 1996). Garcia et al (1996) reported that most studies of the use of SFE in lipid extraction have focused on the yield of extractable material.…”

Batch Extraction of Oil from Rice Bran with Liquefied Low Temperature Dimethyl Ether

“…For extraction of RBO, attempts using supercritical fluid extractions with CO 2 [2,[13][14][15] and methanol/CO 2 [16] were reported by several groups. A maximum RBO yield of 20.5%, which represents over 99% of lipid recovery, was reportedly obtained with a conventional approach using hexane, while the yield with supercritical CO 2 extraction ranged between 19.2 and 20.4% [2,15].…”