JPS62181398A - Purification of fish oil or marine animal oils and fats - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (AlIndustrial Field of Application) The present invention is directed to polyunsaturated fatty acids, particularly polyunsaturated fatty acids with relatively large molecular weights such as eicosapencitric acid (hereinafter referred to as EPA) and docosahexaenoic acid (hereinafter referred to as DHA). The present invention relates to a method for removing and refining colored components and odorous components in fish oil or marine animal fat (hereinafter both are collectively referred to simply as fish oil) containing highly unsaturated fatty acids.

(bl PRIOR ART) The polyunsaturated fatty acids, especially U!, PA and D HA
has the function of suppressing platelet aggregation and preventing the formation of blood clots, and is known as an effective substance in preventing myocardial infarction and cerebral thrombosis.

For this reason, its use in the food, cosmetics, and pharmaceutical industries has recently increased.

Such polyunsaturated fatty acids are found in sardines and mackerel.

Tuna, butterfish, cod, capelin, salmon, caberin,
Fish such as anchovies, sea lions, and seals.

It is contained in approximately several percent of fats and oils obtained from the fat and meat of marine animals such as sea lions, fur seals, walruses, and minke whales, and zooplankton such as krill.

However, fats and oils containing glycerides of polyunsaturated fatty acids having four or more double bonds are extremely unstable.

In addition, this oil has a strong unpleasant odor called fishy odor, and is composed of lower fatty acids and lower aldehydes.

It contains many malodorous components such as lower amines and is dark in color.

Conventionally, these oils and fats are produced by single molecule distillation using conventional methods such as hydro-steam distillation,
Purification has been carried out by activated carbon treatment, acid clay treatment, etc.

(C) Problems to be Solved by the Invention However, since fish oil containing glycerides of polyunsaturated fatty acids is unstable as described above, it is difficult to bond double disappeared, EP
There is a drawback that the content of A and the like decreases. Moreover, since it has a strong fish odor, conventional purification methods leave a residual fish odor and cannot achieve complete deodorization. In addition, residual colored components are also observed, making it difficult to make them completely colorless.

For this reason, it has been difficult to use conventional purification methods in the food, cosmetics, and pharmaceutical industries, which require a high degree of purification.

Therefore, an object of the present invention is to provide a purification method capable of obtaining colorless and odorless fish oil, which is also suitable for the above-mentioned uses.

Means for Solving the FD1 Problem The inventors of the present invention have conducted extensive research to achieve the above objective, and have found that when these oils and fats are brought into contact with silica gel, colored and odorous components are selectively adsorbed to the silica gel. Moreover, it was discovered that fats and oils are difficult to adsorb.

The present invention was completed based on such knowledge, and is characterized by adding a solvent to fish oil with a high polyunsaturated fatty acid content and bringing it into contact with silica gel to remove colored components and odor components. This is a method for refining the fish oil.

The shape of the silica gel particles used in the present invention is 180~
Preferably, it has a spherical shape of 500 μm. Commercially available products include Microbeads 4B (manufactured by Fuji Davison Co., Ltd.);
Examples include silica gel such as Microsphere Gel (manufactured by Asahi Glass Co., Ltd.).

The solvent used in the present invention is petroleum ether.

Hydrocarbon solvents such as hexane are preferred, and mixtures thereof can also be used. The amount of these solvents used is
The amount is preferably 1 to 10 times the amount of the fish oil. There are no particular restrictions on the contact temperature, but it must be below the boiling point of the solvent. Further, the time for contacting the mixture of fish oil and solvent with silica gel is preferably in the range of 0.5 to 4 hours.

The refining method of the present invention can be applied not only to unrefined crude oil but also to fish oil refined by conventional methods.
Furthermore, refined oil of superior quality can be obtained.

(e) Examples Example I 500 g of fish oil containing EPA glycerides and whose main component is sardine oil was dissolved in 2.51 g of hexane, and 1 ml of silica gel (Microbeads 4B, manufactured by Fuji Davison Co., Ltd.) was dissolved.
000g was added and stirred for 2 hours at 30'C to perform decolorization and deodorization treatment. The silica gel was removed from the resulting treatment liquid, and hexane was distilled to obtain 425 g of colorless and odorless purified fish oil.

Example 2 1 kg of fish oil containing EPA glyceride and whose main component is mackerel oil was dissolved in 51 petroleum ether, 2 kg of silica gel (Microsphere Gel, manufactured by Asahi Glass Co., Ltd.) was added, and the mixture was heated at 20°C. Stir for 3 hours for decolorization and deodorization. The silica gel was removed and the petroleum ether was distilled off from the resulting treated solution, resulting in colorless and odorless purified fish oil 860.
I got g.

Comparative Example 1 500g of fish oil from Example 1 and white clay: activated carbon -2 = 1 (7)
Add 2% of the mixture and heat at 100-110℃ for 30 minutes.
After stirring, the white clay was removed using Cerai H, 2%, and decolorization was performed. Next, while blowing water fumes under reduced pressure,
The mixture was deodorized by heating at 140-150'C for 30 minutes to obtain 450 g of purified fish oil.

Comparative Example 2 1 kg of the fish oil of Example 2 was treated in the same manner as in Comparative Example 1 to obtain 900 g of purified fish oil.

Table 1 shows the results of measuring the chromaticity and odor of each of the above refined oils.

Table 1 (') Effects of the Invention According to the present invention, it is possible to produce fish oil with a high content of polyunsaturated fatty acids, which is colorless and has no fishy odor, which was difficult to obtain using conventional refining methods. This product can be used in fields such as food, cosmetics, and medicine.

Claims (1)

[Claims] (1) A method for refining fish oil or marine animal fat that is characterized by adding a solvent to fish oil or marine animal fat with a high content of polyunsaturated fatty acids, and bringing the mixture into contact with silica gel to remove colored components and odorous components.