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Rice bran oil
About: Rice bran oil is a research topic. Over the lifetime, 2102 publications have been published within this topic receiving 32504 citations.
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TL;DR: In this article, a homogeneous transesterification process using response surface methodology (RSM) based on a two-variable central composition design (CCD) was used to determine the effects of long storage on oxidation stability.
56 citations
TL;DR: In this article, a 300 g batch of rice bran oil was extracted with supercritical carbon dioxide (SC-CO2) from the extractor and a second-stage column where an oil phase (raffinate) separated from the CO2 at various controlled temperatures and pressures.
Abstract: In the first stage of this two-stage process, crude rice bran oil was extracted with supercritical carbon dioxide (SC-CO2) from a 300 g batch of rice bran. Oil-laden SC-CO2 from the extractor (24.1 MPa/40 °C) passed continuously to a second-stage column where an oil phase (raffinate) separated from the SC-CO2 at various controlled temperatures and pressures. Measurement of the compositions of raffinates and extracts allowed calculation of partition coefficients of triglycerides, free fatty acids (FFAs), α-tocopherol, sterols, and oryzanol and, hence, the selectivities of the fractionations. Fractionation removed almost all water and reduced the FFA concentration in raffinate by up to 50%. Oryzanol and α-tocopherol concentrations in the raffinate were not reduced by fractionation, but the sterol concentration was reduced under conditions favoring FFA removal. Under the flow rate conditions studied (3.5 kg of CO2/h), the fractionations could be described by equilibria between oil and CO2 phases. Keywords: S...
55 citations
TL;DR: In this article, the reduction in surface tension of Bacillus subtilis MTCC 2423 was studied in submerged batch cultivation using waste frying oils, which facilitates safe disposal of waste frying oil, as well as reducing the production cost of surfactin.
Abstract: - One of the obstacles in the way of wide scale industrial application of biosurfactants is the high production cost coupled with a low production rate. In order to lower the production cost surfactin production by Bacillus subtilis MTCC 2423 was studied in submerged batch cultivation using waste frying oils. It was observed that the decrease in surface tension was 56.32%, 48.5% and 46.1% with glucose, waste frying sunflower oil and waste frying rice bran oil, respectively. Biomass formation was 4.36 g/L, 3.67 g/L and 4.67 g/L for glucose, waste frying sunflower oil and waste frying rice bran oil, respectively. Product yield (g product/g substrate) was 2.1%, 1.49% and 1.1% with glucose, waste frying sunflower oil and waste frying rice bran oil as substrates. This process facilitates safe disposal of waste frying oil, as well reducing the production cost of surfactin. Keywords : Biosurfactants; Bacillus subtilis ; Surface Tension; Waste frying oils; Secondary metabolite.
55 citations
TL;DR: In this paper, supercritical carbon dioxide was used to remove wax and fatty materials from rice bran at high pressure and temperature of 28 MPa and temperatures between 40 and 70°C.
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.
55 citations
TL;DR: The RBO extraction with SC-CO2 had negligible phosphatides, wax and prooxidant metals (Fe and Cu) and was far superior in color quality when compared with RBO extracted with hexane and was comparable with that of hexane extraction.
55 citations