JPS6067597A - Manufacture of crude fish oil - 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] The present invention relates to a method for producing crude fish oil.

Recently, health foods have been attracting attention due to the aging of society and the reduction in medical costs, but among these, EPA (eicosapentaenoic acid) and DHA, which are contained in fresh fish oil, are particularly important.
(docosahexaenoic acid) is attracting attention. However, because polyunsaturated fatty acids such as KPA and DHA have many double bonds in their molecular formulas, they are extremely unstable and easily oxidized (therefore, it is extremely difficult to efficiently produce fish oil containing them). It's difficult.

As mentioned above, KPA and DHA are extremely unstable and easily oxidized, and the oxidation rate increases as the temperature increases. Conventionally, antioxidants are added before and after crushing the fish body, and the oxidation rate is increased under mild conditions. produces crude fish oil. At this time, once peroxide is generated, its quality deteriorates at an accelerated rate, so great care is required when handling it during the manufacturing process.

Although the conventional method is manufactured under conditions that prevent EiPA and DHA from being oxidized, the fish body is used as is, and the fish meat contains hemoglobin, which strongly promotes oxidation, and It contains 70 to 80% of water, which also promotes oxidation, and is manufactured in a state where it is still contained, so it has the disadvantage that it cannot fundamentally prevent oxidation.

On the other hand, as a method for separating crude fish oil from fish meat, extraction using an organic solvent such as hexane is generally performed, but this method has problems in processing the organic solvent after crude fish oil extraction and There is a food sanitation problem in that residual organic solvents in raw materials are harmful to the human body. Physical compression is a common oil separation method that solves this problem, but as mentioned above, fish meat contains a lot of water and has little crude fiber, so this method is used to separate crude fish oil. That is impossible.

The present invention processes fish bodies rationally, mixes and stirs them with plant seeds that have also been rationally processed to produce an intermediate product, and separates crude fish oil from the intermediate product. Accordingly, the above KPA and D during manufacturing
The oxidation of HA can be effectively prevented and the physical pressing method can be applied to the separation of crude fish oil, thus completely eliminating the numerous drawbacks of the conventional methods.

That is, the present invention uses a processed product obtained by making the entire or part of a fish body from which blood has been removed into a micronized solution and then freeze-drying it, and a processed product obtained by micronizing and heat-drying plant seeds. The gist is to obtain crude fish oil by mixing, stirring, and pressing the processed product, and will be described in detail below based on drawings showing examples.

Reference numeral 1 indicates a fish body that is a raw material for producing crude fish oil, and the fish body 1 is preferably a live fish or a fresh fish. 2
is a blood removal device for removing blood from the fish body 1,
The blood removing device 2 may be an automatic blood collecting device disclosed in Japanese Patent Application No. 113,817 of 1980, or may have an appropriate configuration (or may be manually performed. By removing , compounds containing metals such as hemoglobin in the blood, which have the effect of strongly (promoting) the oxidation of EPA and DHA, are removed from the fish body 1.

Reference numeral 3 denotes a micronization device such as a cutter mixer, homozonizer, or blender, and the fish body 1 from which blood has been removed in the previous step is made into a micronization solution by this device 3. Reference numeral 4 denotes a freeze dryer, in which the fish meat, which has been made into a micronized solution, is freeze-dried at a low temperature to, for example, a moisture content of about 1% or less.

Since fish meat is freeze-dried in the form of a finely divided solution, the dehydration efficiency is very high, and since no heating is required, oxidation can be effectively prevented. In this freeze-drying step, oxidation can be further prevented by filling the freeze dryer 4 with an inert gas such as nitrogen (3) gas and expelling air.

Next, reference numeral 5 indicates plant seeds such as soybeans, and the plant seeds 5 are pulverized by a pulverizer 6 such as a Willey pulverizer or a mill. In addition to soybeans, the plant seeds 5 may include wheat, wheat, etc., as long as they contain a relatively large amount of tocopherol (vitamin E).
Sesame, corn, rice, etc. can be selected as appropriate. Reference numeral 1 denotes a constant temperature dryer, and this dryer 7 heats and dries plant seeds. In this process, plant seeds are dehydrated to, for example, 1% or less, and in the case of soybeans, physiologically harmful substances such as tridicin inhibitor and hemagglutinin are inactivated by heating, and the grassy smell is removed. removed. The heating temperature is set to a temperature that achieves the above-mentioned effect, for example, 100°C or higher, but is not set to a temperature of approximately 120°C or higher, which is a temperature at which tocopherols in plant seeds are easily decomposed.

In the present invention, as described above, a processed product obtained by processing the fish body 1 and a processed product obtained by processing the plant seeds 5 are mixed and stirred using a mixing and stirring device 8 such as an automatic mortar machine. Due to gentle stirring, oil from fish meat and oil from plant seeds such as soybeans are mixed, but since tocopherol contained in oil from plant seeds is an antioxidant for EPA and DHA in fish oil, fish oil and fat are mixed together. It is possible to improve the instability of these substances and effectively prevent their oxidation.
Crude fish oil can be obtained by introducing the raw fish oil into a pressing machine 9 such as a screw press or a screw press, and physically compressing it in the pressing machine 9. The processed product introduced into the press 9 has been sufficiently dehydrated as described above, and also contains crude fibers of plant seeds, so that crude fish oil can be efficiently separated and obtained.

Next, examples of the present invention will be shown.

Live yellowtail fish weighing 4 to 6 kg were placed in advance in a culture tank at a temperature of 10°C or less, and the temperature was kept as low as possible to suppress the motility of the live yellowtail. After that, a portion of the live yellowtail was placed into an automatic blood sampling device, and the blood was collected into one fish body. removed from. Then, the yellowtail from which the blood had been removed was cut into two pieces and divided into three parts: the edible part, the subcutaneous fat part, and the visceral part. Next, the edible parts, subcutaneous fat parts, and visceral parts are each made into a fine solution (in other words, mayonnaise state) using a cutter mixer and placed in a freeze dryer 4 at a freezing temperature of -30°C, a maximum drying temperature of 20°C, and a drying time of 15 hours. Dehydrated under the following conditions. As a result, each freeze-dried product with a moisture content of 1% or less was obtained. Among the freeze-dried products, the one that had a relatively strong odor was the freeze-dried internal organs, and the odor of the other products was not so strong that it was noteworthy.

On the other hand, for plant seeds, soybeans from Tokachi, Hokkaido are pulverized using a pulverizer 6.
The powder was dried in a constant temperature dryer 7 at a temperature of 100° C.±5° C. for the purpose of pulverizing the powder and removing moisture contained on average at about 10%.

In this way, each of the above-mentioned lyophilized products and crude fish oil with soybean paste were produced.

Of the obtained crude fish oil, one from internal organs was selected, and in order to compare the stability of this with the crude fish oil that was not mixed with dried fine soybean powder, that is, the raw material was only from internal organs.
When the oxidation and peroxide values of each crude fish oil were measured after being left for 20 days at there were.

As described above, the present invention is capable of rationally dehydrating fish meat by making it into a micronized solution and then freeze-drying it, and also acts as an antioxidant for substances that are rare in the fats and oils of fish meat, such as BPA and DHA in the fats and oils of fish meat. Tocopherol and crude fiber are obtained from plant seeds, that is, the plant seeds are made fine and dried by heating, and the resulting processed product is mixed with the processed fish meat, stirred and crushed to form a new intermediate processed product. Since the crude fish oil is separated from the intermediate processed product, it is possible to effectively prevent the oxidation of KPA and DHA during production, and a physical compression method can be used to separate the crude fish oil.
Unlike extraction methods using organic solvents, this method does not pose any problems in processing organic solvents or food hygiene, and it has the major characteristics of being low cost.

[Brief explanation of drawings]

The figure is an explanatory diagram showing the method of the present invention in terms of apparatus. Code 1... Fish body, 2... Blood removal device, 3... Micronization device, 4... Freeze dryer, 5... Plant seed, 6
. . . Fine grinder, 7. Dryer, 8. Mixing stirring device, 9. Pressing machine. Applicant: Taisei Construction Co., Ltd.

Claims (1)

[Claims] The whole or part of the fish body from which blood has been removed is made into a micronized solution, and then the processed product obtained by freeze-drying and the processed product obtained by micronized and heat-dried plant seeds are mixed and crushed, A method for producing crude fish oil, which comprises compressing the processed product to obtain crude fish oil.