Extraction Of Rice Bran Oil Research Articles

Ambient‐temperature extraction of rice bran oil with hexane and isopropanol

AbstractHexane and isopropanol were compared as solvents for use in ambient‐temperature equilibrium extraction of rice bran oil (RBO). Isopropanol was as effective as hexane in extracting RBO when 20 mL of solvent was used to extract 2 g of bran. Free fatty acid levels were 2–3% in both solvents and similar to that previously reported for hexane extraction of RBO hexane extraction by this method. Larger‐scale extractions with 30 g of bran and 150 mL of solvent produced oil with a similar free fatty acid content and a phosphorus level of approximately 500 ppm. The oil extracted with isopropanol was significantly more stable to heat‐induced oxidation than hexane‐extracted oil. Antioxidants that are more easily extracted by isopropanol than hexane may be responsible for the increased stability.

Pilot Scale Extraction of Rice Bran Oil with Dense Carbon Dioxide

The purpose of this study was to measure the effects of temperature, pressure, and flow rate of dense CO2 on its ability to extract, refine, and fractionate rice bran oil. Column beds (300 g) of rice bran were extracted with dense CO2 at a flow rate of ∼2.5 kg/h, temperatures of 0−60 °C, and pressures of 17−31 MPa over a period of 6 h. The extracted total oil; the free fatty acid, α-tocopherol, sterols (campesterol, stigmasterol, β-sitosterol), and oryzanol components; together with moisture were measured at intervals. Extraction was almost complete in 6 h, and rates of extraction were consistent with saturation of the CO2 with rice bran oil throughout most of the process. Extraction of the oil components was described by apparent partition coefficients between the oil and CO2 phases. The observed differences in partition coefficients provide a basis for refining and fractionation of rice bran oil. Keywords: Dense carbon dioxide; extraction; rice bran oil

Rapid equilibrium extraction of rice bran oil at ambient temperature

AbstractRapid equilibrium extraction of soybean flour has been effective in obtaining an oil with reduced phospholipid content. This technique was examined to obtain a low phospholipid and low free fatty acid rice bran oil (RBO). The amount of RBO extracted with hexane from 1 g of rice bran at 22°C was measured over a 10‐min period. The amount of oil extracted from variable amounts of bran with a fixed volume of solvent was also studied. Ninety percent of the oil was extracted in one minute, with 93% of the total RBO being extracted after ten minutes. This compares with the 98% yield obtained from soy flour, but increasing the amount of bran used did not reduce the extraction rate. This extraction method produced a good quality RBO with low phospholipid, low free fatty acid and low peroxide values.

A preliminary study of rice bran oil expression in a manually operated hydraulic press

In view of the existing problems associated with solvent extraction of rice bran oil in India, mechanical pressing was considered as a promising alternative. An attempt was made, therefore, to develop a test-cell to generate basic data at the laboratory level by a manually operated 20 tonne hydraulic press. The results showed that a maximum 45% oil was recovered at 12·5 MPa (127 kg/cm 2) for a holding time of 45 min without any hydrothermal treatment.

Fractional Extraction of Rice Bran Oil with Supercritical Carbon Dioxide

Fractional Extraction of Rice Bran Oil with Supercritical Carbon Dioxide

Fractional extraction of rice bran oil with supercritical carbon dioxide.

Extraction of oil from rice bran with supercritical carbon dioxide (SC-C02) at pressures of 150 to 350 kg/cm2 G at 40°C was demonstrated. The constituents of the selective fractions obtained at different pressures differed. Fractions obtained at higher pressures contained less free fatty acid and waxes or unsaponifiables. The phosphorus and iron contents were very low in the SC-C02 extracted oil, while the color of the oil was significantly lighter than that of hexane-extracted oil. The yield of low acid value oil was comparable to that for hexane extraction. One problem of the SC-C02 oil is its poor oxidation stability. This method of extraction may be effective in simplifying the processing of edible rice bran oil. Grinding the raw material was found to be effective in decreasing the C02 required and shortening the extraction period.

Direct Extraction of Rice Bran Oil with Lower Acid Value from Rice Bran

Direct Extraction of Rice Bran Oil with Lower Acid Value from Rice Bran