Method for extracting oryzanol from rice bran crude oil

Abstract

The invention discloses a method for extracting oryzanol from rice bran crude oil. The method comprises the following steps: (1) preparing four-stage rice bran oil: (a) performing hydration, degumming and dewaxing on the rice bran crude oil, (b) decolorizing the dewaxed rice bran oil and (c) performing physical refining on the decolorized rice bran oil; (2) extracting crude oryzanol, namely (a) preparing a soap base, (b) performing alkali dissolution operation and (c) performing acidification operation; and (3) refining the crude oryzanol, namely (a) re-dissolving the crude oryzanol and performing solvent oil liquid-liquid washing, (b) performing acidification and acid soaking and (c) drying and crushing the oryzanol. According to the method disclosed by the invention, a physical refining and deacidification process is applied to an alkali dissolution and acidification oryzanol production process, the first alkali refining operation in the existing process is reduced, the yield of the rice bran refined oil is improved, and the loss of 20% of the oryzanol produced by soapstock due to the alkali refining is also reduced. As the physical refining and deacidification process is adopted, the yield of the refined rice bran oil is greatly improved in comparison with the existing alkali dissolution and acidification process, and the yield of essential oil is improved from the original 50-55% to 60-65%.

Description

technical field [0001] The invention relates to a method for extracting oryzanol from crude rice bran oil. Background technique [0002] Oryzanol is a mixture of cycloartenol ferulate and sterol ferulate, which is widely found in the seeds of cereal plants and is a lipid accompaniment. The content of oryzanol in the rice bran layer is generally 0.3-0.5%. When rice bran is heated and pressed to make oil, oryzanol dissolves in the oil. When the oil is prepared by solvent leaching, it is taken out by the mixed oil. After the solvent of the mixed oil evaporates, oryzanol remains in the crude oil. The content of oryzanol in fur bran oil is about 1.8-2.5%. Although many vegetable oils (such as corn germ oil, wheat germ oil, linseed oil, rapeseed oil, etc.) contain oryzanol, but because of its low content, so that there is no industrial extraction value, so far oryzanol is extracted from rice bran oil of. [0003] Oryzanol is mainly used in pharmaceuticals. The use of oryzanol...

AI Technical Summary

Problems solved by technology

[0004] Crude rice bran oil undergoes primary alkali refining, water washing, secondary alkali refining, soapstock, supplementary saponification, acidification, water washing, acidified oil, vacuum dehydration, and vacuum distillation to obtain a concentrate (black foot), then alkali analysis, filtration, and acid analysis , filtration, rough oryzanol, petroleum ether immersion, water washing, vacuum drying, to obtain oryzanol raw powder, although this process produces qualified products of oryzanol, but there are still the following disadvantages: ① complex process, long production cycle

② Low yield of oryzanol and rice bran oil

[0005] Although this improved alkali-soluble acid analysis process has made great progress compared with the original fatty acid distillation process, the yield of oryzanol only reaches 30-35%, the quality of oryzanol product is unstable, and the refining rate of rice bran oil is basically the same as the original process. quite

Images