Study Of Millet Rice Bran Oil Refining And Bran Wax Preparation

Millet rice bran oil is extracted from the refinement of millet bran, which is rich in vitamin E, phytosterols, unsaturated fatty acids, oryzanol and other bioactive substances. At present, domestic and foreign large rice bran research more, the market has little money big rice bran products. But the study of millet rice bran oil is rarely on the market did not see the sale of millet rice bran products. In order to study the nutritional value and millet rice bran oil, rice bran oil, this paper analyzes the millet changes in nutrients in the refining process, dewaxing processes and waxy ingredients, in order to lay the theoretical foundation for the industrial production of millet rice bran oil. Contents and results are as follows:1、millet rice bran oil degumming Study:Identifying millet rice bran oil degumming by single factor and orthogonal test optimum conditions, tests showed that adding the phospholipid content of 50% citric acid solution 0.33 times the conversion unglued 20 minutes when the preheating temperature at 55℃ after adding the phospholipid content of 5 times 10 minutes of hot water of hydration, separable get unglued millet rice bran oil. Under these conditions, the rate of as high as 93.87% degumming.2、A comparative study of high acid value of millet rice bran oil deacidification methods:experiments were determined by alkaline deacidification and alcohol law deacidification optimum conditions, research shows that the amount of alkaline deacidification base excess oil to be deacidification 0.15% by mass, added to a concentration of 20 Baume lye, at 30℃ and 60r/min for half an hour so that the acid-base reaction is sufficiently heated to 60 ℃, stirred 5 min, followed by addition of 5% by mass of the oil to emulsify with saturated brine,60℃ incubation was allowed to stand for 5 hours and centrifuged oil soap, after washing more than the base can be obtained in addition to an acid value of 0.22mgKOH/g or so deacidified oil.Studies show off the results of acid-alcohol method, using a concentration of 80% ethanol, ethanol and oil mass ratio is 2.3: 1,25℃ under conditions of 60r/min for 30 minutes, and then the mixture was placed in a separating funnel static for 30 minutes to alcohol, oleyl distinct layers; collection reservoir, under the same conditions was repeated twice deacidification, after mixing the oil layer, and dried in vacuo at 80℃ for 1 hour to give an acid value of 2.75mgKOH/g or so deacidifled oil.By contrast soda and alcohol laws deacidification at 0.1%,1%±0.5%,4.5%± 0.5%,8% ±0.5%,11.5%±0.5% and 15%± 0.5% in six different concentrations of oxygen environments deacidification effect, the results showed that alkaline deacidification in reducing acid value much better than alcohol law deacidification; and alcohol method is superior to alkaline deacidification deacidification in VE and oil saving rate; two deacidification methods to reduce excessive no significant difference in terms of the value of the oxidation.3 n Study on the extraction of millet rice bran wax:This study showed that the quality of perlite is dewaxing aid, perlite optimal dosage oil wax content of 1/3. Early dewaxed oil temperature control to keep the oil temperature dropped 36℃and 1℃per hour, slow stirring for 16 hours after dewaxing, the oil was allowed to stand at 12℃incubated for 24 hours, mille crude rice bran obtained under the test conditions the maximum wax quality, a minimum oil content, crude wax obtained was 3.2%.4、millet refined rice bran wax:the study of ethyl acetate solvent extraction. The results show that when the mass ratio of the oil with ethyl acetate 2:1 and 60℃conditions, slow stirring and extracted three hours, then allowed to stand for two hours at 15℃conditions, better refining effect wax, oil content only about 0.5%, and high purity millet rice bran wax. Infrared spectroscopy showed a millet rice bran wax component at the strong absorption, a higher fatty acid and higher fatty alcohols belonging compounds; in 2900 to 3000 had a strong absorption based on IR spectroscopy analysis, the corresponding substance may be polycarboxylic esters. Combined with large rice bran wax literature analysis reported thatthere are differences in the millet rice bran wax beeswax beeswax different alcohol esters, alcohol, honey, beeswax esters such substances. With the big difference is millet rice bran wax, rice bran wax, beeswax there myricyl alcohol esters.