JP7080275B2 - Beverages containing hydrogen in containers and their manufacturing methods - Google Patents

Description

The present invention relates to a container-filled hydrogen-containing beverage in which a hydrogen-containing beverage is filled in a container and the container is sealed, and in particular, the retention rate of hydrogen concentration is maintained even in heat sterilization after filling the container and subsequent storage. It relates to a packaged hydrogen-containing beverage that can be maintained in a high state. The present invention also relates to a method for producing the packaged hydrogen-containing beverage and a method for maintaining the hydrogen concentration.

The types of beverage products in Japan continue to increase year by year in order to respond to changes in lifestyle and diversification of tastes for eating and drinking. In particular, so-called RTD (Ready to Drink) -shaped packaged beverages, which are enclosed in a predetermined container and can be drunk as they are, have become the mainstream in all beverage products. Further, RTD-type packaged beverages are classified into so-called chilled products that use paper containers and the like and require refrigerated storage, and so-called dry products that can be stored at room temperature for a long period of time, such as cans and PET bottles. , Dry products have a larger market size.

There are a wide variety of packaged beverages classified as dry products, such as mineral water, coffee beverages, tea-based beverages such as black tea and green tea, vegetable juice beverages, and functional beverages, which are generally long-term beverages of several months. In order to enable storage, heat sterilization is performed after filling the container.
On the other hand, the heat sterilization treatment has always had the problem of suppressing deterioration of flavor and taste due to heating at a high temperature in any of the beverage categories.

In addition, due to the recent increase in awareness of food and health, so-called functional foods and drinks having a physiologically active function for the body are attracting attention. Beverage products are no exception to this, and these days, apart from the above-mentioned foods for specified health use (Tokuho) stipulated in the Health Promotion Law and other foods with nutritional function, they have certain requirements to function as foods. Expectations are high for a new functional beverage system that allows sexual labeling, and intensive research is being conducted on new ingredients that may have bioactive functions.

Hydrogen is one of the substances that has been attracting attention in recent years as a component that may exert a physiologically active function. The so-called "hydrogen water", in which hydrogen is dissolved in water at a high concentration, is currently unknown in terms of the specific behavior of dissolved hydrogen on the body and the details of its mechanism of action, but molecular hydrogen is the active oxygen in the body. It is said to have the effect of removing (oxygen radicals), and is expected to promote various health-promoting effects. Hydrogen water containing hydrogen is widely distributed as hydrogen water products enclosed in containers such as cans and pouches.

As a prior art for hydrogen water, an invention relating to a beverage focusing on the physiologically active function of a raw material other than hydrogen, for example, a hydrogen-containing beverage in which a functional raw material consisting of tea, fruits, vegetables, etc. is mixed with hydrogen water has been proposed. (See Patent Document 1). Further, as a method for producing hydrogen water for drinking, a step of dissolving hydrogen pressurized to a predetermined pressure in the raw material water through a gas permeable membrane, a step of measuring the hydrogen concentration of the dissolved hydrogen water, and a hydrogen concentration are used. A method for producing hydrogen-containing water for drinking, which comprises a step of adjusting the pressure of pressurized hydrogen so as to be within a predetermined range, has been proposed (see Patent Document 2).

Since the solubility of hydrogen in water is proportional to the pressure of hydrogen to be contacted when dissolving, in order to simply increase the solubility, it may be dissolved under high pressure. However, in such a hydrogen-containing beverage, the solubility of hydrogen in water at normal pressure is extremely low (about 1.6 ppm), so that even when it is dissolved in a supersaturated state under high pressure, it is in the form of a container. When stored for a long period of time, the dissolved hydrogen is released into the space (so-called head space) generated between the water in the container and the container, and there is a problem that the hydrogen concentration in the water decreases. Regarding this problem, in the process of attaching the can lid to a can container filled with hydrogen water, a secondary overflow that causes hydrogen water to overflow from the can body is generated, and hydrogen water is fully poured into the metal can body, that is, the above headspace is provided. A method for producing a hydrogen water-filled product that is filled without occurring has been proposed (see Patent Document 3). Further, by having a protrusion inside the cap of the container, the sum of the volume of the protrusion and the volume of the filled hydrogen-containing liquid is equal to the volume which is the full filling amount of the bottle can body. , A hydrogen-containing liquid filling container that does not generate headspace, and a method for filling a hydrogen-containing liquid that fills the hydrogen-containing liquid using the container have been proposed (see Patent Document 4).

Japanese Unexamined Patent Publication No. 2013-169153 Japanese Patent No. 4573904 Japanese Unexamined Patent Publication No. 2014-024606 Japanese Unexamined Patent Publication No. 2016-043955

In both of the methods of Patent Documents 3 and 4, it is considered that the reason why the hydrogen concentration decreases in the hydrogen-containing beverage is that hydrogen is released into the head space, and the hydrogen-containing beverage is fully filled in the container and headed. It is designed so as not to create space.

However, if the packaged beverage such as a bottle can does not have a head space, there is a problem in terms of container strength such that the content (beverage) may be ejected when the bottle is opened because it is vulnerable to impact during transportation and the like. There was a problem that it was not appropriate.
In addition, when the inventors verified the relationship between the volume of the head space and the retention rate of hydrogen concentration (the rate of decrease in hydrogen concentration immediately after filling with liquid), the retention rate of hydrogen concentration could be increased by simply reducing the head space. It turned out that the relationship of improvement did not hold.
Therefore, those skilled in the art can obtain the optimum requirements for head pace for solving the above-mentioned problem of container strength and ensuring the retention rate of hydrogen concentration in a high state, and for beverages containing hydrogen in containers that meet these requirements. Was also unknown.

The present invention has been made in view of the above problems, and is intended to provide a packaged hydrogen-containing beverage in which the hydrogen concentration does not easily decrease after filling the container while ensuring sufficient container strength, and a method for producing the same. With the goal.

As a result of diligent research by the present inventors to achieve the above-mentioned problems, by adjusting the balance between the ratio of the volume of the head space to the content of the enclosed hydrogen-containing beverage and the internal pressure of the head space within a predetermined range. , The present invention has been completed by finding that the above problems can be solved.

That is, the present invention provides the following.
(1) In a container-filled hydrogen-containing beverage, the content of the hydrogen-containing beverage enclosed in the container is VL (mL), the volume of the head space in the container is Hv (mL), and the internal pressure of the head space. Is Hp (MPa), the packaged hydrogen-containing beverage is characterized by satisfying the following formula 1.
0.0020 ≦ (Hv / VL) × Hp ≦ 0.0070 ・ ・ ・ (1)
(2) The packaged hydrogen-containing beverage according to (1), wherein the volume Hv of the head space is 10.0 to 20.0 mL.
(3) The packaged hydrogen-containing beverage according to (1) or (2), wherein the internal pressure Hp of the head space is 0.060 to 0.130 MPa.
(4) Any of (1) to (3), wherein the ratio Hv / VL of the volume Hv of the head space to the content VL of the packaged hydrogen-containing beverage is 0.020 to 0.050. Beverage containing hydrogen in a container as described in.
(5) The packaged hydrogen-containing beverage according to any one of (1) to (4), wherein the hydrogen concentration (ppm) at the time of filling the hydrogen-containing beverage is 1.5 to 3.0 ppm.
(6) The container-filled hydrogen-containing beverage according to any one of (1) to (5), wherein the container is a metal can.
(7) A method for producing a hydrogen-containing beverage in a container, wherein the content of the hydrogen-containing beverage enclosed in the container is VL (mL), the volume of the head space in the container is Hv (mL), and the head. A method for producing a packaged hydrogen-containing beverage, which comprises adjusting VL (mL), Hv (mL) and Hp (MPa) so as to satisfy the following formula 1 when the internal pressure of the space is Hp (MPa). ..
0.0020 ≦ (Hv / VL) × Hp ≦ 0.0070 ・ ・ ・ (1)
(8) The method for producing a packaged hydrogen-containing beverage according to (7), wherein the volume Hv of the head space is adjusted so that the volume Hv of the head space is 10.0 to 20.0 mL. ..
(9) A method for maintaining the hydrogen concentration in a packaged hydrogen-containing beverage, wherein the content of the hydrogen-containing beverage enclosed in the container is VL (mL), the volume of the head space in the container is Hv (mL), and When the internal pressure of the headspace is Hp (MPa), VL (mL), Hv (mL) and Hp (MPa) are adjusted so as to satisfy the following formula 1 of the packaged hydrogen-containing beverage. Hydrogen concentration maintenance method.
0.0020 ≦ (Hv / VL) × Hp ≦ 0.0070 ・ ・ ・ (1)

The packaged hydrogen-containing beverage according to the present invention can solve the above-mentioned problems related to container strength while ensuring a high retention rate of hydrogen concentration even after filling.

Hereinafter, embodiments of the present invention will be described.
1. 1. Beverages containing hydrogen in containers
(Relationship between headspace ratio and headspace internal pressure)
The packaged hydrogen-containing beverage according to the embodiment of the present invention is obtained by enclosing the hydrogen-containing beverage in a container so as to have a predetermined head space.
In the packaged hydrogen-containing beverage according to the present embodiment, the relationship between the content VL (mL) of the hydrogen-containing beverage, the volume Hv (mL) of the head space, and the internal pressure Hp (MPa) of the head space is the following formula 1. It is necessary to meet.
0.0020 ≦ (Hv / VL) × Hp ≦ 0.0070 ・ ・ ・ (1)

Here, the value Hv / VL obtained by dividing the volume Hv of the head space by the content volume VL of the hydrogen-containing beverage can be said to be the ratio of the head space to the hydrogen-containing beverage.
In the hydrogen-containing beverage in a container, the present inventors satisfy the requirement of the above formula 1 that the relationship between the ratio Hv / VL of the head space to the hydrogen-containing beverage and the internal pressure Hp of the head space satisfies the requirements of the above formula 1, so that the impact resistance during transportation and the like is satisfied. It has been found that the properties are excellent, the spillage during opening is suppressed, and the retention rate of hydrogen concentration with time is improved. That is, when (Hv / VL) × Hp is 0.0020 to 0.0070, the retention rate of the hydrogen concentration can be improved and the container strength and the like can be secured. In particular, when (Hv / VL) × Hp is 0.0020 or more, it is possible to secure the container strength and the like while maintaining a higher retention rate of hydrogen concentration. On the other hand, when (Hv / VL) × Hp is 0.0070 or less, the retention rate of the hydrogen concentration becomes particularly excellent.
The upper limit of (Hv / VL) × Hp is 0.0070 or less, preferably 0.0055 or less, more preferably 0.0050 or less, still more preferably 0.0048. It is particularly preferably 0.0035 or less. On the other hand, the lower limit of (Hv / VL) × Hp is 0.0020 or more, preferably 0.0022 or more, and particularly preferably 0.0023 or more.

(Head space ratio)
The ratio of headspace to the hydrogen-containing beverage, Hv / VL, is preferably 0.020 to 0.050, more preferably 0.025 to 0.040, and more preferably 0.030 to 0.040. Is more preferable. When the Hv / VL is 0.020 or more, the impact resistance during transportation is further improved and the spillage during opening is suppressed, while when the Hv / VL is 0.050 or less, the hydrogen concentration over time The retention rate of is better.

(Head space volume)
The volume Hv (mL) of the head space is preferably 10.0 mL to 20.0 mL, more preferably 10.0 mL to 15.0 mL, in consideration of the strength of the container, prevention of ejection at the time of opening, and the like. .. When the head space volume Hv is 10.0 mL or more, the impact resistance during transportation is further improved and the spillage during opening is suppressed, while when the head space volume Hv is 20.0 mL or less, the above In addition to the effect, the retention rate of hydrogen concentration over time becomes better.

Here, the content VL of the hydrogen-containing beverage is obtained by measuring the mass of the empty container before filling the hydrogen-containing beverage and the mass of the packed hydrogen-containing beverage after filling, and the difference is obtained. It is a value obtained by converting the filling mass (g) into a volume (mL) at a specific gravity of 1.00. Further, the head space volume Hv is an increment of the mass of the container-filled hydrogen-containing beverage before opening, which is an increment thereof after opening the cap and filling with water having a specific density of 1.00 to measure the total mass. It is a value obtained by converting the mass (g) of water corresponding to the space volume into a volume (mL) at a specific gravity of 1.00. Details of the method for measuring the content VL and the headspace volume Hv of the hydrogen-containing beverage will be shown in Examples described later.
The content VL of the hydrogen-containing beverage and the volume Hv of the head space are controlled to desired values by using a container having a predetermined capacity and adjusting the filling amount of the hydrogen-containing beverage in the container. be able to.

(Internal pressure of head space)
In the packaged hydrogen-containing beverage according to the present embodiment, the internal pressure Hp of the head space is preferably 0.060 to 0.130 MPa, particularly preferably 0.060 to 0.120 MPa, and 0.070 to 0.070 to 0.120 MPa. It is more preferably 0.100 MPa. When the internal pressure Hp of the head space is 0.060 MPa or more, the impact resistance during transportation is further improved and the spillage during opening is suppressed, while when the internal pressure Hp of the head space is 0.130 MPa or less. The retention rate of hydrogen concentration over time becomes better.

Here, in the present embodiment, the gas constituting the head space is, for example, nitrogen gas, and the internal pressure of the head space is the head by dropping liquid nitrogen or the like after filling the container with the drinking liquid. It can be adjusted by adjusting the amount of liquid nitrogen dropped when winding (sealing) after expelling air or the like from the space.
Further, the internal pressure Hp (MPa) of the head space can be measured by using a vacuum can inspection machine or the like, which is generally called a can tester. When the container-filled hydrogen-containing beverage of the present embodiment is further heat-sterilized after sealing the container, the headspace internal pressure shall be measured after the container is sealed and further heat-sterilized.

(Hydrogen concentration at the time of filling)
For beverages containing hydrogen in containers, the hydrogen concentration at the time of filling the container is the highest, so it is common to display and sing the hydrogen concentration at the time of filling.
In the packaged hydrogen-containing beverage of the present embodiment, the hydrogen concentration (ppm) at the time of filling the hydrogen-containing beverage to be filled is preferably 0.8 ppm or more, more preferably 1.0 ppm or more. It is more preferably 5.5 ppm or more, particularly preferably 1.8 ppm or more, and most preferably 2.0 ppm or more. When the hydrogen concentration at the time of filling is equal to or higher than the above lower limit value, the hydrogen concentration is likely to be maintained at a high value even when the packaged hydrogen-containing beverage is drunk (when the cap is opened), and favorable physiological activity due to hydrogen can be expected. Further, when the hydrogen concentration at the time of filling is equal to or higher than the above lower limit, not only the hydrogen concentration is simply maintained high but also the retention rate of the hydrogen concentration tends to be high as compared with the case where the hydrogen concentration at the time of filling is lower. Therefore, it is particularly preferable.
On the other hand, the upper limit of the hydrogen concentration at the time of filling is not particularly limited, but may be 3.0 ppm or less, and further may be 2.5 ppm or less in consideration of safety at the time of filling, manufacturing cost and the like.

The hydrogen concentration at the time of filling may be adjusted so that the hydrogen concentration becomes a desired value when the hydrogen-containing beverage to be filled in the container is produced.
The measurement of the hydrogen concentration at the time of filling can be selected from existing measuring instruments. In the present embodiment, the hydrogen concentration of the beverage liquid immediately before filling is defined as the hydrogen concentration at the time of filling, which will be described later.

2. 2. Raw Materials for Beverages Containing Hydrogen in Containers The hydrogen-containing beverages in containers according to the present embodiment may be filled with hydrogen-containing beverages so that the above-mentioned (Hv / VL) × Hp satisfies the requirement of Formula 1. In the present embodiment, the solvent of the hydrogen-containing beverage is preferably water.

(Type of water as a solvent)
When the liquid solvent is water, the type is not limited as long as it is suitable for drinking. For example, ion-exchanged water, well water, city water, groundwater, distilled water, natural water, seawater, deep-sea water, etc. are used as raw water. Can be used. The type of hard water or soft water does not matter, but considering that it is suitable for drinking, the hardness (calcium concentration (mg / L) × 2.5 + magnesium concentration (mg / L) × 4.5 is calculated. It is desirable to use water with a value) less than 120.

(Deaeration treatment / deionization treatment)
In the present embodiment, it is desirable to use degassed water previously degassed as the liquid solvent from the viewpoint of more effectively exerting the action of the hydrogen-containing gas.
Further, the deionization treatment for water means removing cations and anions other than hydrogen ions and hydroxide ions contained in water. The water obtained by the deionization treatment is generally called pure water, and in particular, the theoretical ionic product of water (hydrogen ion concentration x hydroxide ion concentration = 1.0 x ^10-14 ), conductivity 5. Those close to 5 × ^10-8 S / cm are also called ultrapure water. In the present embodiment, deionization treatment is not particularly required, but the use of deionized water is not limited.

The hydrogen-containing beverage is obtained by adding hydrogen to the above-mentioned water (which has been degassed or deionized if desired).
Hydrogen-containing beverage or hydrogen water refers to hydrogen-containing beverage or water, and although there is no clear definition, "Molecular Hydrogen Medicine Symposium (Secretariat: Department of Aging Science, Japan Medical University) Cellular Biology" In "Academic Field Laboratory"), "hydrogen water" is a solution in which the concentration of molecular hydrogen is 40 μM or more when opened by a hydrogen water-related consumer. It is said to mean 80 μg / L (0.08 ppm) per 5% of the saturated hydrogen concentration.

Here, the method of containing hydrogen in water as a solvent is not particularly limited, but a method of blowing hydrogen gas above the standard atmospheric pressure or a gas containing hydrogen gas into the solvent in the form of fine bubbles (so-called bubbling) or As a specific example is shown below, for example, a method of injecting hydrogen into a liquid solvent at high pressure via the gas permeable membrane described in Patent No. 5746411 can be selected, but another dissolution method is adopted. However, the effect of this embodiment is the same.

(Gas permeable membrane)
When a method of injecting hydrogen through a gas permeable membrane is adopted, a so-called homogeneous membrane conventionally used for separating gas components can be adopted as the gas permeable membrane.
The specific type of the permeable membrane is not particularly limited, but the film thickness is preferably 20 to 60 μm, more preferably 30 to 60 μm, and even more preferably 30 to 50 μm in order to maintain the strength against pressure.
The material of the gas permeable film can be selected from polyethylene, polymethylpentene, and silicone rubber, but the gas permeable film formed of silicone rubber is the most suitable. It is desirable that the silicone rubber is made of polydimethylsiloxane.

(Performance of gas permeation)
When the above gas permeable membrane is used, it is more desirable to use a gas permeable membrane having a gas permeation ratio Ar (argon) / N ₂ (nitrogen) of 2 or more. The gas permeation ratio is calculated by measuring the gas permeation amount when argon and nitrogen are kept at 1.0 kgf / cm ² at the pressure on the surface in contact with the permeation film, respectively.

(Form of gas permeable membrane)
Further, when the gas permeable membrane is used, the morphology of the permeable membrane is not particularly limited, but it is preferably a hollow fiber membrane-like morphology.
The hollow fiber membrane is a form of utilization of a gas permeable membrane, and refers to a membrane formed in a thin straw-shaped capillary tube. The hollow fiber membrane module composed of a bundle of a large number of hollow fiber membranes is housed in a housing container made of a synthetic resin of vinyl chloride or a metal such as aluminum in a hermetically sealed state. Generally, the diameter (inner diameter) of each hollow fiber membrane is about several mm to 100 μm.

(Other ingredients)
In addition, the packaged hydrogen-containing beverage according to the present embodiment may contain other components as long as the effects of the present embodiment are not impaired. Examples of such other components include plant juices, plant extracts, umami components, minerals, sweetening agents, flavors, acidulants and the like. Further, vitamins, antioxidants, emulsifiers, pastes, pH adjusters, colorants (pigments), oils, quality stabilizers and the like may be contained as long as the effects of the present embodiment are not impaired. However, from the viewpoint of improving the retention rate of hydrogen concentration, at least sugar, lipid, and protein are not substantially contained, and other components are also components derived from water, which is a solvent (for example, minerals). It is preferable that it does not contain any components other than.

(PH)
The pH of the packaged hydrogen-containing beverage according to the present embodiment is not particularly limited, but when the beverage is so-called mineral water, the pH is preferably 5.0 to 9.5 centering on the neutral range. 5.5 to 9.0 is more preferable, 6.0 to 8.5 is more preferable, and 6.2 to 8.0 is the most preferable.
When the packaged hydrogen-containing beverage according to the present embodiment is a so-called acidic beverage, the pH is preferably 2.8 to 5.0, more preferably 3.0 to 4.5, mainly in the acidic range. .2-4.2 is more preferred, and 3.4-3.9 is most preferred.

(container)
The packaged hydrogen-containing beverage according to the present embodiment is provided by being filled in a container. Examples of such containers include PET bottles, cans (aluminum, steel), paper, plastics, retort pouches, bottles (glass) and the like. In the present embodiment, from the viewpoint of improving the retention rate of hydrogen concentration, it is preferable to use a glass bottle, a metal can, or a so-called pouch-shaped container using a metal laminated film, which is required to have an excellent hydrogen barrier property. Above all, it is preferable to use a metal can, and it is particularly preferable to use an aluminum can because it is easy to handle during manufacturing and transportation.
When the container is a metal can, particularly an aluminum can, the container shape is preferably a so-called bottle can shape, which is in the shape of a bottle and can be resealed by a screw-type cap lid. ..
Bottle can-shaped containers are superior in terms of hydrogen retention and resealability, but they do not return to their original state when deformed such as dents compared to PET bottles, so for example, PET bottle beverages filled with hot packs. It is difficult to eliminate or reduce the head space from the viewpoint of impact resistance.
Therefore, it is very difficult to secure both the hydrogen retention function and the impact resistance performance without relying on the knowledge of the present embodiment.

The capacity of the container is not particularly limited as long as it satisfies the requirements of the present embodiment, but is preferably 300 to 550 mL. When the capacity of the container is within such a range, it becomes easy to secure the above-mentioned headspace volume and headspace ratio even if a sufficient amount of hydrogen-containing beverage is filled, and the retention rate of hydrogen concentration should be good. Can be done.

3. 3. Production method In the container-filled hydrogen-containing beverage according to the above embodiment, the content volume VL and headspace volume of the hydrogen-containing beverage enclosed in the container so that the product of the head space ratio and the head space internal pressure becomes a desired value. It can be manufactured by a conventionally known method except for adjusting Hv and headspace internal pressure Hp.

For example, hydrogen is injected into water that has been degassed, if desired, via a gas permeable membrane to prepare a hydrogen-containing beverage having a predetermined hydrogen concentration. The hydrogen-containing beverage is filled in a metal can, and a desired amount of liquid nitrogen is dropped to adjust the internal pressure of the container after sealing (after heat sterilization) to expel the air in the head space, and then the sealing (rolling) is performed. .. When filling with a hot pack, heat sterilization (post-sterilization) is performed after this sealing.

(Sterilization)
The packaged hydrogen-containing beverage according to the present embodiment can be produced under the sterilization conditions specified in the Food Sanitation Law when it can be sterilized by heating. As for the sterilization conditions, a method that can obtain the same effect as the conditions stipulated in the Food Sanitation Law may be selected. Is preferable. As a sterilization method, there is retort sterilization or the like, but if the method is to sterilize the entire container, a method of bathing high temperature water from the outside of the container or the like can be selected.

The packaged hydrogen-containing beverage according to the above-described embodiment has a headspace because the relationship between the ratio Hv / VL of the headspace volume to the content of the hydrogen-containing beverage and the internal pressure Hp of the headspace satisfies a predetermined requirement. However, the hydrogen concentration is unlikely to decrease.

Further, the embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

Hereinafter, the present invention will be described in more detail by showing production examples, test examples and the like, but the present invention is not limited to the following test examples and the like.

[Manufacturing of bottled hydrogen-containing beverages]
The dissolved gas was degassed from natural water in a negative pressure environment of −0.08 MPa, then sterilized at 126 ° C. for 30 seconds, and then cooled to 25 ° C. was used. Under sterile conditions, hydrogen was injected into the water through a gas permeable membrane to prepare a hydrogen-containing beverage having a hydrogen concentration at the time of filling as shown in Table 1. The obtained hydrogen-containing beverage is filled in a washed and sterilized aluminum can so as to have the content shown in Table 1, liquid nitrogen is dropped from the filling opening to expel air from the head space, and then a cap is wound. It was tightened and sealed, and after sterilization at 81 ° C. for 5 minutes, a bottled hydrogen-containing beverage was obtained (Example 1).

Further, except that the aluminum can was changed and the filling amount of the hydrogen-containing beverage, the hydrogen concentration at the time of filling, and the dropping amount of liquid nitrogen were changed, the same production as in Example 1 was carried out to obtain a packaged hydrogen-containing beverage. (Examples 2 to 12, Comparative Examples 1 to 7). In each of the Examples and Comparative Examples, a plurality of packaged hydrogen-containing beverages were produced under the same conditions and used in the following test examples.

<Test Example 1> Measurement of content and headspace volume In each of the container-filled hydrogen-containing beverages of Examples and Comparative Examples, the mass of an empty container before filling with the hydrogen-containing beverage was measured. Next, the mass of the packaged hydrogen-containing beverage after filling with the hydrogen-containing beverage was measured, and the difference before and after filling was taken as the filling mass (g) of the hydrogen-containing beverage. The obtained packed mass was converted into a volume (mL) at a specific gravity of 1.00, and the content (mL) of the hydrogen-containing beverage was calculated. The results are shown in Table 1.

Further, for each of the container-filled hydrogen-containing beverages of Examples and Comparative Examples, the mass before opening was measured, and then the cap was opened and water having a specific gravity of 1.00 was fully poured to measure the total mass. The increase in mass before and after opening corresponds to the mass (g) of water filled in the headspace. The mass (g) of water corresponding to the obtained headspace volume was converted into a volume (mL) at a specific gravity of 1.00, and the headspace volume (mL) was calculated. The results are shown in Table 1.

<Test Example 2> Measurement of headspace internal pressure For each of the container-filled hydrogen-containing beverages of Examples and Comparative Examples, the headspace internal pressure (unit: MPa) after post-sterilization was measured using a vacuum can detector (manufactured by Yokoyama Keiki Co., Ltd.). It was measured. The results are shown in Table 1.

<Test Example 3> Measurement of Hydrogen Concentration In each of the container-filled hydrogen-containing beverages of Examples and Comparative Examples, a needle-type hydrogen concentration measuring device (manufactured by Unisense) was used to measure the hydrogen concentration of the hydrogen-containing beverage immediately before filling the container. Unit: ppm) was measured. In addition, each container-filled hydrogen-containing beverage was stored at 25 ° C. for 2 weeks, and then the hydrogen concentration was measured. Based on these results, the retention rate of hydrogen concentration was calculated by the following formula.
Hydrogen concentration retention rate (%) = (hydrogen concentration after 2 weeks at 25 ° C) / (hydrogen concentration at filling) x 100
The results are shown in Table 1.

As shown in Table 1, the sample satisfying the requirements of the present invention was excellent in the retention rate of the hydrogen concentration after 2 weeks at 25 ° C.

The packaged hydrogen-containing beverage according to the present invention can be distributed at room temperature because the hydrogen concentration does not easily decrease, and the hydrogen concentration does not decrease even when stored at room temperature. Further, since the packaged hydrogen-containing beverage according to the present invention has a head space, it has excellent impact resistance even during distribution such as during transportation, and the content (hydrogen-containing beverage) is ejected at the time of opening. There is no fear of doing so. Therefore, the packaged hydrogen-containing beverage according to the present invention is particularly suitable in that it can be applied to various drinking scenes.

Claims (6)

A beverage containing hydrogen in a container
When the content of the hydrogen-containing beverage enclosed in the container is VL (mL), the volume of the head space in the container is Hv (mL), and the internal pressure of the head space is Hp (MPa).
The internal pressure Hp of the head space is 0.060 to 0.130 MPa, and
A packaged hydrogen-containing beverage characterized by satisfying the following formula 1.
0.0020 ≦ (Hv / VL) × Hp ≦ 0.0070 ・ ・ ・ (1)
(However, the container is a glass bottle or a pouch-shaped container using a metal laminated film .) The packaged hydrogen-containing beverage according to claim 1, wherein the volume Hv of the head space is 10.0 to 20.0 mL. The packaged hydrogen-containing beverage according to claim 1 or 2, wherein the hydrogen concentration (ppm) at the time of filling the hydrogen-containing beverage is 1.5 to 3.0 ppm. A method for producing a packaged hydrogen-containing beverage.
When the content of the hydrogen-containing beverage enclosed in the container is VL (mL), the volume of the head space in the container is Hv (mL), and the internal pressure of the head space is Hp (MPa).
The internal pressure Hp of the head space is adjusted to 0.060 to 0.130 MPa, and the head space is adjusted to be 0.060 to 0.130 MPa.
A method for producing a packaged hydrogen-containing beverage, which comprises adjusting VL (mL), Hv (mL) and Hp (MPa) so as to satisfy the following formula 1.
0.0020 ≦ (Hv / VL) × Hp ≦ 0.0070 ・ ・ ・ (1)
(However, the container is a glass bottle or a pouch-shaped container using a metal laminated film .) The method for producing a packaged hydrogen-containing beverage according to claim 4, wherein the volume Hv of the head space is adjusted so that the volume Hv of the head space is 10.0 to 20.0 mL. A method for maintaining the hydrogen concentration in a packaged hydrogen-containing beverage.
When the content of the hydrogen-containing beverage enclosed in the container is VL (mL), the volume of the head space in the container is Hv (mL), and the internal pressure of the head space is Hp (MPa).
The internal pressure Hp of the head space is adjusted to 0.060 to 0.130 MPa, and the head space is adjusted to be 0.060 to 0.130 MPa.
A method for maintaining a hydrogen concentration in a packaged hydrogen-containing beverage, which comprises adjusting VL (mL), Hv (mL) and Hp (MPa) so as to satisfy the following formula 1.
0.0020 ≦ (Hv / VL) × Hp ≦ 0.0070 ・ ・ ・ (1)
(However, the container is a glass bottle or a pouch-shaped container using a metal laminated film .)