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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 paper, Steaming and ohmic heating (OHM) were used to stabilize rice bran before oil extraction using three extracting methods namely, immersion in n-hexane, Soxhlet, and an enzymatic method.
Abstract: In the production process of rice bran oil (RBO), the bran itself requires stabilization immediately after milling to protect against oil degradation from lipase. This study aimed to investigate the effects of stabilization and extraction methods on the chemical quality, bioactive content, and antioxidant activity of RBO. Steaming and ohmic heating (OHM) were used to stabilize rice bran before oil extraction using three extracting methods namely, immersion in n-hexane, Soxhlet, and an enzymatic method. The oil obtained from rice bran stabilized using OHM and extracted using the enzymes had the best chemical quality with the lowest values of FFA (1.51 ± 0.04%), highest level of γ-oryzanol (1190.1 ± 89.3 µg/g), and strongest total antioxidant activity (21.3 ± 0.32 mg AEE/g and 15.5 ± 0.24 mg BHAE/g). Results suggested that combination between OHM and enzymes is an effective process for the preparation of RBO and can be considered as an alternative extraction process.
11 citations
TL;DR: In this article, a simple method of silica gel percolation was developed to purify rice bran oil deodorizer distillates to obtain phytosterol concentrate fractions (PCF) and a brown color and bad odor fraction (BCBOF).
Abstract: Samples of rice bran oil deodorizer distillates (RBO DOD-1 and RBO DOD-2) were studied for their physicochemical characteristics. The samples were semisolid and had a dark color. The free fatty acid values were 59.2% and 86.0%, the unsaponifiable matter was 18.7% and 7.75% and the phytosterol contents were 8.71% and 4.22%, respectively for the deodorizer distillates studied. A simple method of silica gel percolation was developed to purify DOD to obtain phytosterol concentrate fractions (PCF) and a brown color and bad odor fraction (BCBOF). The color values were reduced by 72.8% and 73.0% of lovibond units in the PCF for DOD-1 and DOD-2 respectively, had no bad odor and were increased in the phytosterol concentration to 12.4% and 5.9%. The PCF was further processed to prepare high purity phytosterols. An HPLC analysis of the phytosterol mixture showed it to be formed by β-sitosterol (38.2%), stigmasterol (34.9%), campesterol (9.5%) and other sterols (17.4%).
11 citations
TL;DR: A two-step enzymatic transesterification process in a solvent-free system has been developed as a novel approach to the production of biodiesel using acid oil from rice bran oil soapstock with maximum yields obtained in both stepwise uses.
Abstract: A two-step enzymatic transesterification process in a solvent-free system has been developed as a novel approach to the production of biodiesel using acid oil from rice bran oil soapstock. The acid oil consisted of 53.7 wt% fatty acids, 2.4 wt% monoacylglycerols, 9.1 wt% diacylglycerols, 28.8 wt% triacylglycerols, and 6.0 wt% others. Three immobilized lipases were evaluated as potential biocatalysts, including Novozym 435 from Candida antarctica, Lipozyme RM IM from Rhizomucor miehei, and Lipozyme TL IM from Thermomyces lanuginosus. The effects of molar ratio of acid oil to ethanol, temperature, and enzyme loading were investigated to determine the optimum conditions for the transesterification with the three immobilized lipases. The optimum conditions of the three immobilized lipases were a molar ratio of 1:5 (acid oil to ethanol), the temperature range of 30-40°C, and the enzyme loading range of 5-10%. The two-step transesterification was then conducted under the optimum conditions of each lipase. The stepwise use of Novozym 435 and Lipozyme TL IM or Lipozyme RM IM and Lipozyme TL IM resulted in similar or higher levels of yield to the individual lipases. The maximum yields obtained in both stepwise uses were ca. 92%.
11 citations
11 citations
Patent•
12 May 2010
TL;DR: In this paper, a method for refining rice bran oil by using short distance distillation was proposed, which avoids heavy pollution processes of alkali refining and neutralizing chemical process for obtaining soda soap and process discharging waste water of washing.
Abstract: The invention discloses a method for refining rice bran oil by using short distance distillation. The method is implemented by putting crude rice bran oil in a buffer pot directly, transferring into a primary film evaporator by a pump for dehydration and desaeration, performing primary dehydration and desaeration under conditions of temperature being 60-120 DEG C and pressure being negative 0.8MPa to negative 0.95MPa; pumping the dehydrated and desaerated rice bran oil into a secondary short distance evaporator for deacidification with temperature controlled at 100-200 DEG C and pressure at 100-0.1Pa to obtain oleic acid with high acid value and rice bran oil with low acid value. The invention avoids heavy pollution processes of alkali refining and neutralizing chemical process for obtaining soda soap and process discharging waste water of washing when processing rice bran oil, the procedure is simple, high value oleic acid and low acid value rice bran oil can be distilled and separated, and the separation process is a physical process, the rice bran oil has no loss and the yield is very high.
11 citations