Method for preparing rice bran crude oil from rice bran

Abstract

The invention relates to a method for preparing rice bran crude oil from rice bran, and particularly relates to a method for preparing low-bran wax rice bran crude oil rich in physiologically active substances from the rice bran at a low temperature. The lixiviation of the existing rice bran oil mostly pursues high extraction rate purely and ignores the influence of process conditions on oil characteristics. In order to solve the problem of how to keep good nutritive value of oil on the premise of obtaining high extraction rate during bran oil extraction, the method is as follows: the rice bran crude oil is extracted by adopting a low-temperature extraction process. According to the invention, the oryzanol and tocopherol content of the rice bran crude oil lixiviated under the condition of 20 DEG C is far higher than that of the rice bran crude oil lixiviated at a high temperature, in such a way, the nutritive value of the rice bran oil can be effectively enhanced; in addition, waxes are difficult to separate out and enter the rice bran crude oil under the condition of low temperature according to the hot melting and cold separating principle of the bran waxes on n-hexane, so that the quality, such as transparency, smell and color, of the rice bran oil is enhanced, and the separation of the physiologically active substances during wax freezing treatment is reduced.

Description

technical field

[0001] The invention relates to a method for preparing rice bran crude oil rich in physiologically active substances and low in bran wax from rice bran at low temperature. Background technique

[0002] Rice bran accounts for about 5% to 5.5% of the weight of rice, and rice germ accounts for about 2.5%. Crude rice bran oil can be extracted from rice bran, a special oil plant, and refined to obtain edible rice bran oil with nutritional and health functions. Rice bran oil is a nutrient-rich vegetable oil with high content of unsaturated fatty acids, the best ratio of oleic acid and linoleic acid at 1:1, and rich in natural active ingredients such as oryzanol, tocopherol and tocotrienol, And the absorption rate after eating is over 90%. Rice bran oil contains about 2% to 5% wax. Bran wax is insoluble in water, ethanol, etc., but it has the property of hot melting and cold analysis for some solvents such as n-hexane, isopropanol, No. 6 solvent, that is, when he...

Examples

specific Embodiment approach 1

[0009] Specific embodiment one: a method for preparing rice bran crude oil from rice bran, characterized in that the method of extracting rice bran crude oil rich in physiologically active substances and low in bran wax with n-hexane under low temperature conditions is realized through the following steps: 1. Rice bran Preparation of crude oil: Weigh 100g of puffed rice bran, use n-hexane, which has heat-dissolving and cold-analysis properties for bran wax, as a solvent, and put the puffed rice bran suspension with a solid-liquid ratio of 1:1 to 1:5 into a plug Put it into a conical flask, put it into a magnetic stirrer, set the extraction temperature at 10-30°C, after 1-3 hours of extraction time, put the suspension into centrifuge tubes respectively, put them in an explosion-proof centrifuge, 3000r / Under the condition of min, centrifuge for 15min, take the supernatant, pour the supernatant into the rotary evaporator, the temperature of the water bath is 60°C, and the rotatio...

specific Embodiment approach 2

[0010] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, puffed rice bran and n-hexane are added to a stoppered Erlenmeyer flask at a ratio of 1:1 to 1:5 for low-temperature extraction of rice bran hair oil, other steps are the same as in Embodiment 1.

specific Embodiment approach 3

[0011] Specific embodiment three: the difference between this embodiment and specific embodiment one is that in step one, puffed rice bran and n-hexane will be added to a conical flask with a stopper in a ratio of 1:1 to 1:5, and the extraction temperature is 10 Low-temperature extraction of crude rice bran oil is carried out at ~30°C, and the other steps are the same as in Embodiment 1.

technical field

[0001] The invention relates to a method for preparing rice bran crude oil rich in physiologically active substances and low in bran wax from rice bran at low temperature. Background technique

[0002] Rice bran accounts for about 5% to 5.5% of the weight of rice, and rice germ accounts for about 2.5%. Crude rice bran oil can be extracted from rice bran, a special oil plant, and refined to obtain edible rice bran oil with nutritional and health functions. Rice bran oil is a nutrient-rich vegetable oil with high content of unsaturated fatty acids, the best ratio of oleic acid and linoleic acid at 1:1, and rich in natural active ingredients such as oryzanol, tocopherol and tocotrienol, And the absorption rate after eating is over 90%. Rice bran oil contains about 2% to 5% wax. Bran wax is insoluble in water, ethanol, etc., but it has the property of hot melting and cold analysis for some solvents such as n-hexane, isopropanol, No. 6 solvent, that is, when he...

Examples

specific Embodiment approach 1

[0009] Specific embodiment one: a method for preparing rice bran crude oil from rice bran, characterized in that the method of extracting rice bran crude oil rich in physiologically active substances and low in bran wax with n-hexane under low temperature conditions is realized through the following steps: 1. Rice bran Preparation of crude oil: Weigh 100g of puffed rice bran, use n-hexane, which has heat-dissolving and cold-analysis properties for bran wax, as a solvent, and put the puffed rice bran suspension with a solid-liquid ratio of 1:1 to 1:5 into a plug Put it into a conical flask, put it into a magnetic stirrer, set the extraction temperature at 10-30°C, after 1-3 hours of extraction time, put the suspension into centrifuge tubes respectively, put them in an explosion-proof centrifuge, 3000r / Under the condition of min, centrifuge for 15min, take the supernatant, pour the supernatant into the rotary evaporator, the temperature of the water bath is 60°C, and the rotatio...

specific Embodiment approach 2

[0010] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, puffed rice bran and n-hexane are added to a stoppered Erlenmeyer flask at a ratio of 1:1 to 1:5 for low-temperature extraction of rice bran hair oil, other steps are the same as in Embodiment 1.

specific Embodiment approach 3

[0011] Specific embodiment three: the difference between this embodiment and specific embodiment one is that in step one, puffed rice bran and n-hexane will be added to a conical flask with a stopper in a ratio of 1:1 to 1:5, and the extraction temperature is 10 Low-temperature extraction of crude rice bran oil is carried out at ~30°C, and the other steps are the same as in Embodiment 1.