Processing technology of deep sea fish oil in high EPA (Eicosapentaenoic Acid) DHA (Docosahexaenoic Acid) contents

Abstract

The invention discloses a processing technology of deep sea fish oil in high EPA (Eicosapentaenoic Acid) DHA (Docosahexaenoic Acid) contents. The deep sea fish oil is subjected to the technologies such as fish oil pretreatment, decoloration and deodorization, fractionation and winterization. According to the processing technology disclosed by the invention, decoloration and deodorization are combined together, heating time is shortened while refining of oil is carried out at a lower temperature, DHA and EPA in the fish oil can be effectively prevented from being decomposed during a deodorization and decoloration process due to too high temperature, the probability of oxidation is reduced, meanwhile, generation of pollutants such as trans-fatty acid can be controlled, and the DHA and EPA contents of products can be increased; meanwhile, the DHA and EPA contents in the fish oil can be further increased through refining and an improved secondary winterization process, the DHA and EPA contents in the fish oil which is finally obtained through a method are three times or above higher than those of common fish oil, and the fish oil can be directly applied to healthcare products and babyfood.

Description

technical field [0001] The invention relates to a processing technology of deep-sea fish oil with high EPA and DHA content, and belongs to the technical field of oil processing. Background technique [0002] Fish oil is a general term for all oils in fish, including body oil, liver oil and brain oil. The main fish oil is a kind of oil extracted from fatty fish, rich in omega-3 polyunsaturated fatty acids (DHA and EPA ), has health benefits such as anti-inflammatory and blood lipid regulation. DHA is of great significance to the development of the brain, the beginning of the development of the neural tube in the brain, the myelination of brain nerve cells, the development of brain cells that control information transmission, the extension and expansion of neurons, and the gradual formation of neurotransmitters. Fish oil rich in DHA is deeply Consumers love it. However, fish oil is easily oxidized during processing, and DHA is easily damaged, which greatly reduces the conten...

AI Technical Summary

Problems solved by technology

However, fish oil is easily oxidized during processing, and DHA is easily damaged, which greatly reduces the content of DHA in fish oil products. To play the function of DHA, it is necessary to further concentrate the DHA and EPA in fish oil

[0003] But the polyene fatty acid in deep-sea fish oil, including DHA, is a thermally and chemically unstable substance, and it is extremely difficult to separate and purify it. At present, the separation and purification techniques for DHA mainly contain the following: 1. Urea inclusion method, mainly using Urea molecules can form stable crystal clathrates with straight-chain saturated fatty acids or monounsaturated fatty acids during the crystallization process, thereby obtaining high-purity DHA products. The disadvantages are long reaction time, low product yield, and serious urea residues; 2 , low-temperature solvent crystallization method, mainly using the different solubility of different fatty acids (salts) in organic solvents at low temperature to separate and purify

Its disadvantage is that it needs long reaction time, recycles a large amount of organic solvent, and the separation efficiency is not high; 3. Lipase concentration method, which selectively hydrolyzes triglycerides containing DHA / EPA, and finally enriches polyvalent unsaturated fatty acid triglycerides , its shortcoming is that the reaction time is long, and enrichment DHA and EPA mixing concentration are more than 60% and still comparatively difficult; 4, adsorption separation method, utilize the different distribution coefficients of the fatty acid of different degree of saturation on adsorbent (such as silver ion) and separate

The disadvantage is that the eluent is easy to contaminate the product and the separation scale is small; 5. Supercritical CO 2 Extraction method, using the extractant CO 2 It has excellent solvent properties at a certain temperature and a certain pressure, and is separated by using the difference in the free path of the molecules of the mixture components.

Its disadvantages are high equipment requirements and high energy consumption; 6. Molecular distillation method has the advantages of simple operation, low cost and no solvent residue

[0004] Therefore, at present, the general method is to increase the content of DHA and EPA through molecular distillation, but the general treatment process of fish oil is pretreatment, decolorization and deodorization, molecular distillation and winterization, etc., but the DHA in fish oil in this process and EPA are often oxidized and decomposed due to the high temperature of the decolorization and deodorization process, reducing the content of DHA and EPA in fish oil; therefore, there is an urgent need for a comprehensive and effective method for improving the content of DHA and EPA in fish oil