Enzyme-method esterification deacidification technology for rice bran oil with high acid value

Abstract

The invention discloses an enzyme-method esterification deacidification technology for rice bran oil with a high acid value. The technology comprises the following steps: step one, obtaining rice bran oil with a high acid value; step two, carrying out enzyme-method esterification deacidification: heating the rice bran oil obtained in the step one under stirring in vacuum, adding glycerin and Lipozyme 435 immobilized lipase, carrying out esterification reactions between rice bran oil and glycerin in the presence of Lipozyme 435 immobilized lipase so as to obtain the de-acidified rice bran oil; step three, obtaining rice bran oil with a low acid value. In the provided technology, under a certain vacuum degree and temperature, the Lipozyme 435 immobilized lipase is used to catalyze the esterification reactions between the free aliphatic acids in rice bran oil with a high acid value and the glycerin so as to reduce the content of the free aliphatic acids, and thus the acid value of the rice bran oil can be reduced to below 3 mgKOH / g. The provided technology has the advantages of safety, environment-friendliness, low cost, and high refining yield, and is suitable for being applied to edible oil production.

Description

technical field [0001] The invention relates to a process for deacidifying oil, in particular to a process for enzymatic esterification and deacidification of high-acid rice bran oil. Background technique [0002] Rice bran oil is a kind of oil produced by pressing or leaching rice bran, a by-product of rice processing. It contains a reasonable composition of unsaturated fatty acids, including 38% linoleic acid and 42% oleic acid. The ratio is about 1:1.1, which is in line with international health The optimal ratio recommended by the organization, and rice bran oil is also rich in oryzanol, vitamin E, squalene, phytosterols, compound lipids and more than a dozen natural bioactive ingredients, and is known as "nutrition and health care oil" by nutritionists. ". Edible rice bran oil can promote the metabolism of cholesterol and lipids, effectively lower cholesterol, prevent atherosclerosis, and prevent cardiovascular and cerebrovascular diseases. At the same time, it also h...

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Problems solved by technology

[0003] In the prior art, alkali refining deacidification requires a large amount of water and chemicals, resulting in high oil refining consumption, lowering the nutritional quality of oil, and a large amount of organic wastewater generated by deacidification, which pollutes the environment; the physical refining method has a low refining rate and the oil The loss of accompanying substances is large, and the process has strict requirements on equipment; the existing patent CN101319167B "High acid value rice bran oil esterification and deacidification" uses zinc oxide as a catalyst, because zinc oxide has certain toxicity, high energy consumption, and many by-products , the reaction temperature is high, the color of the oil after the reaction is deepened, and the oil produced is difficult to be used for edible oil; in the patent CN104327954A "a kind of rice bran oil enzymatic deacidification process", before the reaction esterification, it is necessary to add an organic solvent (n-hexane and acetone) treatment, the reaction time is as long as dozens of hours, and the acid value can only be reduced to below 4mgKOH / g, and the efficiency is low

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