JP3459617B2 - Processed dried egg yolk - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a novel method for producing processed dried egg yolk.

[0002]

2. Description of the Related Art Low-cholesterol foods are not only used as therapeutic foods for patients with arteriosclerosis, but are recently in high demand as health foods. By the way, egg yolk is a food having a unique taste and flavor, and is used as a raw material for confectionery, mayonnaise, etc., but since it contains a relatively large amount of cholesterol, those with reduced cholesterol such as health foods and processed foods. It is desired as a raw material. Conventionally, to obtain decholesterolized egg yolk, a method of treating spray-dried dry egg yolk with supercritical carbon dioxide (Japanese Patent Publication No. 62-51092) or a method of treating drum-dried dry egg yolk with supercritical carbon dioxide (special Front flat 7-5
07930) has been proposed. However, according to the former of the above-mentioned conventional method, although it is possible to return to low-concentration saline, the decholesterolization rate is poor because the carbon dioxide in the supercritical state is unbalanced or easily clogged during the decholesterolization treatment. In some cases. In addition, according to the latter, the cholesterol removal rate is good, but because the egg yolk is overheated by drum drying and the protein is heat-denatured, only a poor return to low-concentration saline is obtained. However, there is a problem that it is difficult to obtain processed dried egg yolk suitable for raw materials such as health foods.

[0003]

Therefore, the present invention has been made for the purpose of providing a method for producing a processed dried egg yolk which is highly reversible to low-concentration saline and has a high decholesterolization rate. is there.

[0004]

[Means for Solving the Problems] (1) Dry egg yolk obtained by spray drying
Extruded and granulated using an inderPorous granules
After that, decholesterolize it with supercritical carbon dioxide
The particle size distribution is 10-100 μm.
A feature is the manufacturing method of processed dried egg yolk. (2) Press with a granulator with a screen diameter of 1.5 to 3.0 mm.
(1) Processed dried egg yolk
Manufacturing method. Achieved by

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below. In addition,
In the present invention, “%” means “mass%”.
In carrying out the present invention, first, a raw material egg yolk is prepared. As this egg yolk, raw egg yolk obtained by breaking chicken eggs or thawed frozen egg yolk may be used.

Next, the raw egg yolk is spray-dried to obtain dried egg yolk. This dried egg yolk has a particle size distribution of 10 to 10
It is a fine powder having a range of 0 μm. Incidentally, a drying method such as drum drying in which excessive heating is carried out is not suitable because only a processed dried egg yolk having no dissolving power for a low-concentration salt solution can be obtained, as will be shown in the later test examples.

Next, the dried egg yolk is extruded and granulated by using a binder of fresh water, and then dried to obtain granules having a water content of 7% or less. In conventional granulation, it is common knowledge to use a binder to which starch, protein powder or the like is added. However, in the present invention, when such a binder is used, a film of starch or protein covers the surface of granules obtained by granulation. As a result, carbon dioxide in a supercritical state does not penetrate into the granules in the low cholesterol treatment, and the cholesterol reduction efficiency is significantly lowered, which is not suitable.

When using the binder of fresh water, the amount of water added to the dried egg yolk is preferably 18 to 25%. If the amount of water added is large, it becomes difficult to form porous granules. On the other hand, if the amount is too small, the granules themselves cannot be formed, and even if the granules are finished, the granules collapse during drying and return to fine powder. . This water addition can be efficiently performed without adding lumps by adding fresh water in a spray state while stirring the dried egg yolk.

The dry egg yolk added with the fresh water binder may be granulated by a conventional method using a bucket type blade type granulator. Granules are obtained by this granulation, and the diameter of the extrusion screen of the granulator is 1.5 to
3.0 mm is desirable. If it is less than 1.5 mm, the porosity is lost due to the pressure, and the penetration of supercritical carbon dioxide into the granules is suppressed. Further, when the diameter exceeds 3.0 mm, the binding force between the egg yolk particles is weak, so that it is difficult to form granules, and fine powder of dry egg yolk is mixed in the granules, which causes a drift in supercritical carbon dioxide treatment. , Because the cholesterol removal efficiency is poor. When extrusion granulation is performed with a granulator having a screen diameter of 1.5 to 3.0 mm, remarkable cholesterol removal efficiency is exhibited as shown in the following test examples.

Finally, the above-mentioned granules are subjected to decholesterolization treatment with supercritical carbon dioxide by a conventional method to obtain the desired processed dried egg yolk. Here, decholesterolization includes not only complete removal of cholesterol in dried egg yolk but also reduction of cholesterol content to approximately 0.5% or less. In addition, since the supercritically treated dried egg yolk is granulated without using a binder having a binding property, it is easy to spray the dried egg yolk with a particle size of 10 which is within the range of the particle size distribution of the dried egg yolk. Return to ~ 100 μm fine powder. Here, the range of the particle size distribution being 10 to 100 μm means that most of fine powder (95% or more) is 10 to 1
It means that the particle size is 00 μm. Since this fine powder has a large surface area, it can be dissolved even in a low-concentration saline solution.

[0011]

In the present invention, the dried egg yolk obtained by spray-drying is extruded and granulated by using a binder of fresh water. Since it is in a state where it has porosity. As a result, it has both surface area derived from fine particles and porosity due to granules, high permeability of carbon dioxide in the supercritical state, and efficient extraction of cholesterol because drift and clogging do not occur. can do. Further, the egg yolk is not excessively heated, and further, after the supercritical treatment, the granules due to physical pressure are easily collapsed to return to a fine powder having a particle size distribution of 10 to 100 μm before granulation. Since it has a large surface area and is porous, the ability to dissolve in low-concentration saline is also improved.

Examples and test examples will be described below.

[Examples] Example 1 Egg yolk obtained by breaking chicken eggs was spray-dried to produce dried egg yolk (water content 3.5%: particle size distribution 10 to 100 µm). This dried egg yolk was put in a Hobart mixer, and while stirring, fresh water was added in a spray form as a binder to add water until the water content became 18%. Then, this was extruded and granulated (manufactured by Hata Tekko KK, bucket type: screen diameter 2.
(0 mm) and then dried in a fluidized bed dryer to a water content of 2.5% to obtain granular egg yolk. This granule yolk 3
When 00 g was brought into contact with 30 kg of supercritical carbon dioxide at 40 ° C. and 25 MPa in a test plant, 174 g of processed dried egg yolk consisting of fine powder having a particle size distribution of 10 to 100 μm was obtained. This processed dried egg yolk had a cholesterol content of 0.2%.

[0013]

[Test Example] Test Example 1 The following four types of samples were prepared. Control area 1 (by the production method of Tokuhyo Hyodai 7-507930) The egg yolk obtained by splitting chicken eggs was drum-dried to produce dried egg yolk (water content 3.5%), and this dried egg yolk was used as Example 1. Controlled dried egg yolk control group 2 obtained by supercritical carbon dioxide treatment under the same conditions (by the method of Japanese Patent Publication No. 62-51092) Egg yolk obtained by splitting chicken eggs was spray-dried to dry egg yolk (water content 3. 5%) was prepared, and the dried egg yolk was treated with supercritical carbon dioxide under the same conditions as in Example 1 to obtain a processed dried egg yolk control group 3. A 1% starch solution was added as a binder to the dried egg yolk in a spray form. Other than that, processed dried egg yolk test section obtained by treating under the same conditions as in Example 1 processed dried egg yolk obtained in Example 1 The cholesterol content and the particle size distribution of fine powder were measured for each sample. , Soluble in saline The results in Table 1 was observed sex were obtained.

[0014]

[Table 1]

From Table 1, it can be understood that according to the present invention, a processed dried egg yolk having a low cholesterol content and good solubility in a saline solution having a low concentration can be obtained.

Test Example 2 Egg yolk obtained by splitting chicken eggs was spray-dried to produce dried egg yolk (water content 3.2%). The dried egg yolk was placed in a Hobart mixer, and while stirring, fresh water was added as a binder to add water until the water content became 18%. Next, when granulating the hydrated dried egg yolk with an extrusion granulator (the same as that used in Example 1), the screen diameter was changed as shown in Table 2 and other operations were the same as those in Example. Similarly,
Five types of granular egg yolks (samples) were produced. Next, for each sample, 300 g of
It was brought into contact with 30 kg of supercritical carbon dioxide under the conditions of 0 ° C. and 25 MPa to obtain 5 types of processed dried egg yolk. When the cholesterol content of each of the obtained dried egg yolks was measured, the results shown in Table 2 were obtained.

[0017]

[Table 2]

From Table 2, it can be seen that the extrusion granulation is 1.5 to
It can be understood that a granulated processed egg yolk with a low cholesterol content can be obtained by granulating using a 3.0 mm screen and subjecting it to supercritical carbon dioxide treatment.

[0019]

As described above, according to the present invention, it is possible to produce a processed egg yolk which has a high decholesterolization rate and can be dissolved in a salt solution having a low concentration. The processed egg yolk is a health food or a processed food. It is suitable as a raw material.

Claims (2)

(57) [Claims] 1. Porous granules obtained by extrusion-drying dried egg yolk obtained by spray drying with a binder of fresh water.
And then decholesterolizing it with supercritical carbon dioxide to obtain fine particles having a particle size distribution of 10 to 100 μm. 2. The method for producing a processed dried egg yolk according to claim 1, which comprises extruding and granulating with a granulator having a screen diameter of 1.5 to 3.0 mm.