JP2531532B2 - Manufacturing method of sterilized grated ginger - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing sterilized grated ginger.

(Prior Art) Japanese Patent Application Laid-Open No. 51-38466 proposes a method for producing grated ginger, which comprises adding salt and vitamin C to grated ginger and then heat sterilizing the mixture. According to the known document, the heat sterilization condition requires heating at about 120 ° C. for 1 hour. However, if the grated ginger is heat-sterilized at a temperature of over 100 ° C, (1) the original flavor of grated ginger is significantly impaired, (2) grated ginger turns brown, and (3) the physical properties of grated ginger change due to syneresis, etc. However, it is impossible to obtain grated ginger with good quality.

(Problems to be Solved by the Invention) It is an object of the present invention to obtain a method for producing grated ginger which has a good quality in flavor, color tone and the like and is sterilized to such a degree that there is no problem even when it is distributed at room temperature.

(Means for Solving Problems) The present inventors have obtained the following findings as a result of repeated studies for achieving the above object.

(1) Some molds, yeasts, and lactic acid bacteria grow in grated ginger whose pH is adjusted to 4.5 or less.

(2) Grated ginger has a bacteriostatic action that is believed to be based on the phenolic compounds contained in the ginger essential oil.

(3) Therefore, considering the above points (1) and (2), even if the sterilization treatment is performed at a temperature lower than the sterilization condition generally known in the known art, it is commercially preserved. You can get grated ginger with no problems in terms of sex.

The present inventors proceeded further research based on the above findings, flavor, color tone and the like are not affected, and sterilizing method of grated ginger for sterilizing to the extent that there is no problem even at room temperature distribution and in that case The optimum sterilization condition was investigated. As a result, it was found that it is most effective to put grated ginger in a synthetic resin tube and heat sterilize it under specific conditions.

The present invention was made based on these findings,
The gist thereof is a method for producing sterilized grated ginger, which is characterized in that, when heat-sterilizing grated ginger stored in a synthetic resin tube, the heat-sterilizing treatment is performed under the following conditions.

(A) The grated ginger in the synthetic resin tube is heated at the slowest point between 60 and 85 ° C. by a method having the same effect as heating at 70 ° C. for 1 second to 30 minutes.

(B) The surface temperature of the synthetic resin tube is maintained at 100 ° C. or lower. Is.

 The present invention will be described in detail below.

Grated ginger is prepared as follows. As the raw material, crushed ginger is used as the main raw material, and pH adjusting agents such as citric acid and lactic acid are used as auxiliary raw materials, various gums, seasonings, flavors, pigments, starches and the like. Then, grated ginger and an appropriately selected auxiliary material are mixed to prepare ginger. In addition, in order to give the grated ginger higher storability, it is desirable to prepare the grated ginger as follows. PH of grated ginger
Is 4.5 or less. Grated ginger should contain at least 50% by weight of ground ginger.

The prepared grated ginger is placed in a synthetic resin tube. The synthetic resin tube used here is formed of a synthetic resin film made of an appropriate material having heat resistance at the sterilization temperature. As the material of the tube,
In particular, the inner and outer layers are a polyolefin film such as polyethylene and polypropylene, and the intermediate layer is a laminated film composed of an oxygen impermeable film such as a saponified product of ethylene vinyl acetate copolymer, heat resistance during sterilization treatment, and grated ginger. It is preferable in terms of storage stability and ease of squeezing the tube. The thickness of the synthetic resin film is, for example, 100 to 600.
A value of μ is preferable because it improves heat resistance during sterilization and heat transfer to grated ginger, and facilitates squeezing the tube.

The synthetic resin tube has an inner diameter of the main body of, for example, 5 to 5.
It is desirable to form it with a size of 50 mm, preferably 10 to 40 mm. When the inner diameter of the body is within the above range, the grated ginger in the tube can be uniformly heated, particularly when the sterilization treatment is performed under the sterilization conditions described below.

The grated ginger stored in the synthetic resin tube is subjected to heat sterilization treatment. In this case, the heat sterilization treatment is performed under the following conditions.

(A) The grated ginger in the synthetic resin tube is heated at a slowest point between 60 and 85 ° C by a method having the same effect as heating at 70 ° C for 1 second to 30 minutes (further preferable conditions Is heated by a method having the same effect as heating at a delay point of grated ginger in a tube between 65 and 80 ° C at 70 ° C for 2 seconds to 20 minutes). The slowest point is the portion of the tube where the temperature rise of grated ginger is most delayed.

In addition, as a method having the same effect as the above-mentioned conditions, when the maximum slowdown point is heated at once and cooled at once, each temperature may be held for a certain period of time. Further, in the case where the slowest point is gradually heated and cooled, the bactericidal value may be integrated at a temperature considered to have bactericidal effect. The following are examples of specific sterilization conditions accumulated in this manner.

● Equivalent to heating at 70 ° C for 1 second.

 65 ° C, 8 seconds 60 ° C, 50 minutes 65 ° C, 5 seconds and 70 ° C, 0.5 second addition ● Equivalent to 70 ° C, 30 minutes heating.

75 ° C, 7 minutes 80 ° C, 90 seconds 70 ° C, 20 minutes and 75 ° C, 3 minutes of addition (b) Maintaining the surface temperature of the synthetic resin tube at 100 ° C or lower (further preferable conditions are: Keep the surface temperature below 90 ℃).

In the heat sterilization process, if the slowest point of grated ginger in the tube is less than 60 ℃, it will take a long time to fully kill the problematic microorganisms at room temperature storage. In this case, the taste of grated ginger , The scent is spoiled. On the other hand, when the slowest point exceeds 85 ° C, the flavor of grated ginger is impaired and browning is likely to occur. Furthermore, in the heat sterilization treatment, when the surface temperature of the tube exceeds 100 ° C, the heating of the grated ginger becomes uneven, the flavor of the grated ginger is impaired, and browning easily occurs, and at the same time, the tube is deformed by heat. Problems will come up. When the grated ginger is placed in a synthetic resin tube and subjected to heat sterilization treatment, by satisfying the above conditions (a) and (b), (1) killing of microorganisms, (2) It is possible to sterilize grated ginger, which is comprehensively good in all aspects of quality of grated ginger and (3) tube maintenance.

The heat sterilization treatment can be performed using steam, hot water, hot air, far infrared rays, microwaves, or the like or a combination thereof as a heat medium. The conditions for satisfying the above conditions (a) and (b) when using each heat medium are as follows.

When steam is used as a heat transfer medium: Steam achieves an ambient temperature of 60 to 100 ℃,
Allow to contact tube for minutes.

When using hot water as a heating medium: Immerse the tube in hot water at 60 to 100 ° C for 3 to 30 minutes.

It is most desirable to use steam among the heat mediums. In this case, the sterilization conditions described above can be easily achieved, and the water droplets adhering to the tube after the sterilization can be easily removed, which is convenient in operation.

When the heat sterilization treatment is carried out using steam, hot water or the like as the heat medium, it is desirable to remove the water droplets attached to the tube after the treatment. Examples of the method for this include blowing air (either hot air or cold air) onto the tube, or vibrating the tube to fly water droplets, or absorbing water droplets with a water absorbing material. If you blow the tube with air,
For example, a wind speed of 0.5 to 10 m / sec can effectively remove water droplets.

It should be noted that the lid portion of the tube, in particular, the peripheral wall 1 of the lid portion and the inner cylinder 2 for fitting the mouth portion of the tube main body become a double cylinder,
It can be formed so that a gap 4 is provided between them (see FIG. 1, which is a cross-sectional view of the lid portion of the tube). When the lid having the above-mentioned shape is used and the heat sterilization process is performed by using steam as a heat medium, the peripheral wall 1 and the inner cylinder 2 of the lid are used.
Steam enters the gap 4 between the tube and the grated ginger at the mouth of the tube body and can be sufficiently sterilized. At the same time, when removing water droplets attached to the tube after sterilization, it can be easily removed by blowing air.

It is desirable to cool grated ginger after heat sterilization to room temperature within 15 minutes after heat sterilization. This makes it possible to further improve the flavor and color tone of grated ginger as the final product.

According to the present invention, sterilized grated ginger is produced as described above. The present invention will be described in more detail with reference to the following examples.

[Example 1] (Preparation of grated ginger) 90% by weight of ground ginger, 0.3% by weight of citric acid, natural gum
0.2% by weight, 2.0% by weight of salt and 7.5% by weight of water were mixed with a kneader to obtain ginger. The pH of grated ginger is about 4.
Was 3.

(Filling of grated ginger) 40 g of the above grated ginger into the synthetic resin tube below.
Each g was filled and sealed. Specifically, the mouth is sealed,
The tube main body, in which the hip portion of the body portion was opened, was filled with grated ginger from the hip portion, and after filling, the hip portion was sealed.
The lid shown in FIG. 1 is attached to the mouth of the main body in advance.

Synthetic resin tube: ● The body is composed of polyethylene / saponified ethylene vinyl acetate copolymer / polyethylene, and its thickness is 40
Formed from laminated film with a thickness of 0μ ● Body inner diameter 25mm, internal volume about 40cc (sterilization of grated ginger) Grated ginger stored in a synthetic resin tube, using a steam sterilization system, 80 ~ It heat-sterilized by contacting with a tube for 10 minutes in an atmosphere of 82 ° C. In the above sterilization treatment, the slowest point of grated ginger in the tube is 70 ℃
The surface temperature of the synthetic resin tube is 80
It was ~ 82 ° C.

After the heat sterilization treatment, cold air was blown onto the tube at a wind speed of 5.0 m / sec to remove water droplets attached to the tube. at the same time,
The grated ginger was cooled to room temperature. The time required for cooling to room temperature after the heat sterilization treatment was about 10 minutes.

Table 1 shows the performance of grated ginger that has been heat-sterilized as described above. In addition, Table 1 also shows the performance of grated ginger heat-sterilized under the conditions described in the same table as in the method of Example 1 (Examples 2 to 4, Comparative Examples 1 and 2). .

 The performance was evaluated as follows.

● Bacterial killing Bacterial tests were performed on mold, yeast, lactic acid bacteria, and coliforms. The numbers of fungi and yeasts were measured by the malt agar plate method, the lactic acid bacteria by the BCP added plate aunt agar method, and the coliforms by the BGLB method.

● Flavor and color tone after sterilization This is a sensory evaluation of the flavor and color tone of grated ginger immediately after cooling after sterilization.

● Flavor and color tone after storage This is a sensory evaluation of the flavor and color tone of grated ginger after storage for 6 months at room temperature.

FIG. 2 shows the region of suitable sterilization conditions when grated ginger is subjected to heat sterilization treatment under various conditions according to the method of Example 1. The indications in the figure indicate the following, respectively. The vertical axis represents the logarithm of time, and the horizontal axis represents the processing temperature.
Further, L1 represents a boundary line at which bacteria die, in which the bacteria die on the line and on the right side of the line, and the bacteria die insufficiently on the left side. L2 represents the border line of the quality of grated ginger, and the quality of the grated ginger is kept good on the line and on the left side thereof, and the quality of the grated ginger deteriorates on the right side. L3 represents the boundary line of the deformation of the chove. On the line and on the left side of the line, there is no deformation of the tube, and on the right side, the tube surface is uneven and the tube is deformed.

As is clear from Table-1 and FIG. 2, when the grated ginger is placed in a synthetic resin tube and subjected to heat sterilization, the slowest point of the grated ginger in the tube is heated to a specific condition and When the surface temperature is below a certain temperature, (1) killing of microorganisms, (2) quality of grated ginger, and (3) sterilization of grated ginger, which is generally good in all aspects of tube maintenance, is achieved. To be done.

(Effect of the Invention) According to the present invention, the quality is good in flavor, color tone, etc.,
Moreover, it is possible to obtain sterilized grated ginger that has been sterilized to the extent that there is no problem even if it is distributed at room temperature.

[Brief description of drawings]

FIG. 1 shows a sectional view of the lid portion of the tube. FIG. 2 shows the region of suitable sterilization conditions when grated ginger is subjected to heat sterilization treatment under various conditions according to the method of Example 1.

Claims (6)

(57) [Claims] 1. A method of producing sterilized grated ginger, which comprises sterilizing grated ginger stored in a synthetic resin tube under the following conditions. (A) The grated ginger in the synthetic resin tube is heated at a slowest point between 60 and 85 ° C. by a method having the same effect as heating at 70 ° C. for 1 second to 30 minutes. (B) The surface temperature of the synthetic resin tube is maintained at 100 ° C. or lower. 2. The method according to claim 1, wherein the grated ginger has a pH of 4.5 or less. 3. The production method according to claim 1, wherein the grated ginger contains 50% by weight or more of crushed ginger. 4. The method according to any one of claims 1 to 3, wherein the heat medium for the heat sterilization treatment is steam. 5. The method according to claim 1, wherein the heat medium for the heat sterilization treatment is hot water. 6. After the heat sterilization treatment, the water droplets adhering to the tube are removed by blowing air on the tube, vibrating the tube, or absorbing the water droplets with a water absorbing material. The manufacturing method described.