Method for deacidifying rice bran oil by using enzymic method

Abstract

The invention discloses a method for deacidifying rice bran oil by using an enzymic method. The method comprises the following steps: mixing rice bran oil with glycerinum, adding lipase which accounts for 2-7% of the total mass of a substrate, enabling the component to react for 5-7 hours in a vacuum device, feeding a product into a nitrogen cooling device, cooling to 25-30 DEG C, and centrifuging so as to remove lipase, thereby obtaining the deacidifed rice bran oil. The method for deacidifying rice bran oil by using the enzymic method, which is disclosed by the invention, is low in rice bran oil acid value, high in nutrient element retention rate, efficient and rapid in reaction, and is a rice bran oil deacidification method which is green and applicable to industrial production.

Description

technical field [0001] The invention belongs to the technical field of synthesis of structural glycerides, in particular to a method for enzymatic deacidification of rice bran oil. Background technique [0002] Rice bran oil is a kind of vegetable oil made from rice bran, a by-product of rice processing. Its fatty acid composition ratio is suitable for human body absorption and rich in nutrients (oryzanol, vitamin E, sterol, etc.), and it is recognized as a nutritious and healthy oil in the world. Due to the lipolytic enzyme contained in rice bran, the fat in rice bran will be decomposed into fatty acids during rice processing and rice bran oil production, resulting in a higher content of free fatty acids (FFA) in processed crude rice bran oil, sometimes up to 40% . Both the traditional alkali refining deacidification and physical refining have certain limitations and are not suitable for the deacidification of rice bran oil with high acid value. At present, there are chem...

AI Technical Summary

Problems solved by technology

Because rice bran contains a highly active lipase that can rapidly hydrolyze rice bran lipids, the acid value of crude oil increases rapidly, so the acid value of rice bran crude oil is very high, about 10-30mgKOH / g, and some are even higher. High, which brings great difficulties to the refining of rice bran oil

Crude rice bran oil also contains 3% to 5% of impurities such as wax, phospholipids and pigments. These substances must be refined to remove them, but refining will cause the loss of nutrients, especially the deacidification process is decisive for the retention of nutrients. effect