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.

Biosurfactant from Lysinibacillus chungkukjangi from Rice Bran Oil Sludge and Potential Applications

Abstract: A newly discovered bacterium, Lysinibacillus chungkukjangi, was isolated from the sludge of rice bran oil processing. When the bacterium was grown on rice bran, it produced biosurfactant which reduced the surface tension of the media to 27.9 from 72 mN/m. The biosurfactant was recovered by a solvent extraction method and characterized with the help of various structure elucidation techniques viz. FTIR, 1H- and 13C-NMR spectroscopy and LC–MS analysis. The combined results of FTIR and NMR revealed the presence of carbonyl, olefinic and aliphatic groups, with the typical spectra of lipids. Moreover, LC–MS analysis also supported the same information. The biosurfactant was also studied for its anti-oxidant and microbial enhanced oil recovery (MEOR) potential. The anti-oxidant activity was observed by the DPPH free radical scavenging method using ascorbic acid as the standard. The IC50 (the half maximal inhibitory concentration) was calculated and for standard, it was 0.056 mg/mL and for the biosurfactant it turned out to be 1.3 mg/mL which shows its good anti-oxidant potential. The sandpack test was performed to check its MEOR potential and kerosene was recovered up to 90 %, which shows its excellent applicability in the MEOR processes.

Nutritional evaluation of rice bran oil and a blend with corn oil

Abstract: Rice bran oil (RBO) is an unconventional oil of very high potential availability in China. This study was done to evaluate the nutritional qualities of RBO and a blend with corn oil. The effect of these oils on serum lipids and lipid peroxidation was investigated in growing chickens. The response parameters were total cholesterol, triglycerides, high density lipoprotein cholesterol (HDL-c), low density lipoprotein cholesterol (LDL-c) and lipid peroxidation. Others were feed efficiency and growth in chickens. The chemical parameters of oil constituents were composition of fatty acids, acid value and peroxide value. The results indicated that the gain in body weight and the feed efficiency ratio did not show a significant difference with chickens fed RBO or corn oil (CO) or blended oil (BO), CO-fed animals exhibited a low level of lipid peroxidation. There is no significant difference in total serum cholesterol and HDL-c levels between RBO- and CO-fed animals. The experiment indicated that serum triglycerides and LDL-c are lower in BO-fed than in RBO- or CO-fed animals. The results suggest that P/S ratio of various edible oils had no consistent correlation with the responses of serum lipids, and that rice bran oil has a nutritional quality similar to that of CO. Chemical analyses showed that the blend of RBO with CO and antioxidant vitamin E (0.03%, wt/wt oil) reduced the acid and peroxide value. Thus, the nutritional value of RBO may be enhanced by blending it with CO and fortifying it with vitamin E. Beurteilung des Nahrwertes von Reiskleieol und Mischungen mit Maisol Reiskleieol ist ein in China noch wenig genutztes aber moglicherweise aussichtsreiches Speiseol. In dieser Studie wird der Nahrwert von Reiskleieol und einer Mischung desselben mit Maisol untersucht. Ferner wird der Einflus dieses Oles mit der Mischung auf die Konzentration von Lipiden im Blutserum und auf den Gehalt von Lipidperoxiden im Blut von jungen Hahnchen untersucht. Dazu werden im Serum von Hahnchen Gesamtcholesterol (Tc), Triglyzeride, High-Density-Lipoproteincholesterol (HDL-c). Lipidperoxidzahl im Serum, sowie die Futterverwertbarkeit und Wachstumszunahme bestimmt. Ferner wird der Gehalt verschiedener Fettsauren im Ol. der Sauregrad und die Peroxidzahl ermittelt. Bezuglich der Gewichtszunahme sowie der Futterverwertbarkeit werden keine signifikanten Unterschiede zwischen einem Futter mit Reiskleieol, Maisol und eine Mischung von beiden Olen nachgewiesen. Tiere, denen eine Futtermischung mit Maisol verabreicht wurde, hatten eine niedrigere Lipidperoxidkonzentration im Blut. Der Gehalt des Serums an Gesamtcholesterol und des HDL-c zeigt keine signifikanten Unterschiede in den Tiergruppen, deren Futter Reiskleieol oder Maisol enthielt. Dies mag ein Hinweis dafur sein, das der Nahrwert von Reiskleieol vergleichbar ist mit dem des Maisol. Ein weiterer Versuch zeigte, das Triglyzeride und Low Density Lipoprotein Cholesterol (LDL-c) im Blutserum bei Tieren in der Maisolgruppe niedriger waren als bei denen der Reiskleieol-Gruppe. Demnach last sich der Nahrwert von Reiskleieol verbessern, wenn es mit Maisol gemischt wird. Analysen zeigen, das eine Mischung aus Reiskleieol/Maisol. dem das Antioxidans Vitamin E (0,03%, wt/wt Ol) zugegeben wurde, die Saurezahl reduzierte.

Processing Technology of Rice Bran Oil

Abstract: Rice bran oil (RBO) is not a seed-derived oil. Therefore, the crude oil obtained by conventional solvent extraction using hexane has a number of impurities that are required to be removed before human consumption. Unlike other oils, the bran contains a lipase enzyme that converts the neutral oil to free fatty acids (FFAs) and partial glycerides. The bran has to be either stabilized or it has to be subjected to solvent extraction immediately after rice milling. However, the crude RBO will have higher FFA contents compared to other common vegetable oils. The use of alkali for neutralization may result in higher refining loss. More importantly, RBO contains a number of minor constituents such as oryzanol, tocopherols, tocotrienols, squalene, phytosterols, steryl esters, etc. having proven health benefits. The major challenge for a processor is to keep most of these micronutrients intact in the refined oil. The addition of alkali reduces the micronutrient contents in refined oil. It is, therefore, evident that physical refining would be the preferred refining methodology for RBO. The major prerequisite for processing the oil through physical refining is to have phosphorus content

Mikrovalna ekstrakcija bioaktivnih spojeva

Abstract: The paper presents examples of microwave extraction and degradation of bioactive compounds. Some positive and negative aspects of microwave heating can be observed, and also its influence on heated milk, as well a development of oxidation in sunflower oil subjected to microwave heating. Degradation of mycotoxins using microwave-induced argon plasma and the use of microwaves for the extraction of essential oils is shown. One can see, the advantages of solvent-free microwave extraction of essential oil from aromatic herbs, in comparison with the standard extraction, and determination of antioxidant components in rice bran oil extracted by microwave-assisted method. Comparison of microwave and ultrasound extraction, as well as positive and negative aspects of the combination of microwaves and ultrasound is described.

Development and evaluation of rice giant embryo mutants for high oil content originated from a high-yielding cultivar ‘Mizuhochikara’

Abstract: Rice bran oil is a byproduct of the milling of rice (Oryza sativa L.). It offers various health benefits and has a beneficial fatty acid composition. To increase the amount of rice bran as a sink for triacylglycerol (TAG), we developed and characterized new breeding materials with giant embryos. To induce mutants, we treated fertilized egg cells of the high-yielding cultivar ‘Mizuhochikara’ with N-methyl-N-nitrosourea (MNU). By screening M2 seeds, we isolated four giant embryo mutant lines. Genetic analysis revealed that the causative loci in lines MGE12 and MGE13 were allelic to giant embryo (ge) on chromosome 7, and had base changes in the causal gene Os07g0603700. On the other hand, the causative loci in lines MGE8 and MGE14 were not allelic to ge, and both were newly mapped on chromosome 3. The TAG contents of all four mutant lines increased relative to their wild type, ‘Mizuhochikara’. MGE13 was agronomically similar to ‘Mizuhochikara’ and would be useful for breeding for improved oil content.