Method for preparing oryzanol from rice oil

Abstract

The invention discloses a method for preparing oryzanol from rice oil. The method comprises the following process: selecting a secondary alkali refining process to efficiently capture nigre rich in oryzanol, producing a crude oryzanol product from nigre by a weak acid substitution method, and further refining the crude oryzanol product to obtain an oryzanol product. The nigre can also be subjectedto impurity removal with ethanol, a ferulic acid product is obtained through an alkali dissolution and acid precipitation method, the crude oryzanol product is recombined into a secondary rice bran oil product, and all-natural high-oryzanol-content rice bran oil meeting the requirements of European Union and Japan is produced. According to the method, a rice bran oil refining comprehensive processing technology is adopted, chemical refining of rice bran crude oil and a weak acid substitution method production technology of oryzanol are organically combined, the oryzanol in production leftovernigre is effectively captured and extracted while the acid value of the rice bran oil is guaranteed, and green deep processing of rice bran oil resources is achieved.

Description

technical field [0001] The invention relates to the field of oryzanol extraction technology, in particular to a method for preparing oryzanol from rice oil. Background technique [0002] Oryzanol is mainly obtained from rice bran oil, and the extraction techniques mainly include acidification distillation separation, methanol direct extraction and weak acid substitution. The acidification distillation separation method is to extract oryzanol from the soapstock of alkali refining. The hydrolysis loss of oryzanol during saponification and full saponification, and the thermal cracking loss of oryzanol during distillation lead to low extraction rate of oryzanol (30%-40%) and poor product quality. Currently It is hardly used in industrial production; the direct methanol extraction method uses the property that oryzanol is easily soluble in alkaline methanol solution to directly extract oryzanol from rice bran crude oil, and the yield can reach 68%. However, due to the use of met...

AI Technical Summary

Problems solved by technology

Therefore, most rice bran oil factories can only produce rice bran crude oil and cannot be refined and processed. At the same time, the acid value reduction of clean oil after the first alkali refining has a great impact on oryzanol capture in the second alkali refining.

If the retained acid value of the first alkali refining is too high, the amount of soapstock produced by the second alkali refining is large, and the concentration of oryzanol in the soapstock is low, which is not conducive to subsequent extraction; if the retained acid value is too low, the amount of soapstock produced by the second alkali refining Too little, the capture of oryzanol is not sufficient, which affects the extraction rate

Moreover, in the subsequent refining process of rice bran oil after deacidification, especially the decolorization and deodorization process, due to high temperature, the oryzanol retained in the deacidification clear oil is cracked, thereby greatly reducing the quality of the finished rice bran oil

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