JP2007111042A - Method and apparatus for preserving green tea beverage packed in transparent container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for preserving green tea beverage packed in a transparent container, capable of showing sufficient browning decreasing effect by an easy and low-cost method; and to provide an apparatus for preserving the green tea beverage. <P>SOLUTION: This method for preserving the green tea beverage packed in a transparent container comprises irradiating green tea beverage colored light or white light which contains wavelength component of 495-505 nm at an irradiance of ≥2 μW/mL in cold preservation and ≥15 μW/mL in a heating condition of ≥50°C at an integrated value of radiant flux of 495-505 nm. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a storage method and storage of a transparent container-packed green tea beverage capable of reducing browning that occurs during storage of the transparent container-packed green tea beverage in a showcase, a wamer, etc. for selling transparent container-packed green tea beverages such as PET bottles. Relates to the device.

  Conventionally, when storing green tea beverages packed in transparent containers such as PET bottles, in order to reduce the progress of browning during storage, it is stored at a low temperature, or a container with an oxygen barrier property or oxygen absorption property is used. The method is adopted. Patent Document 1 discloses a method for preventing browning of a tea beverage by adding trehalose to the tea beverage.

However, these methods have a problem that the effect of reducing browning is not yet sufficient, or the production of beverages is expensive.
JP 2001-112414 A

  The present invention has been considered in view of the problems of the prior art, and is intended to provide a storage method and storage device for a transparent container-packed green tea beverage that can exhibit a sufficient browning reduction effect by a simple and low-cost method. To do.

  In the process of repeating experiments and research to achieve the object of the present invention, the present inventors, when irradiated with green light to a transparent container-packed green tea beverage being stored, are not stored at low temperature as in the prior art, but at room temperature or It has been found that even when stored at a low temperature, the progress of browning can be effectively reduced, and this phenomenon is observed not only with green light but also with colored light other than red light such as blue light, and even with white light. It was found that the effect of reducing browning can be achieved by irradiating at a high illuminance of 1000 Lux or more exceeding the illuminance of the fluorescent lamp. As a result of further experimentation and research, the accumulated value of the radiant flux of 495 to 505 nm is 495 at an irradiance of 2 μW / mL or more when stored at room temperature and 15 μW / mL or more when stored at 50 ° C. or higher. It has been found that when a green tea beverage is irradiated with colored light or white light containing a wavelength component of ˜505 nm, the browning reduction effect is effectively and reliably achieved, and the present invention has been achieved. Conventionally, in the technology for preserving green tea, it is common sense that when tea leaves are exposed to sunlight, a odor of sunlight is generally generated, which causes deterioration when exposed to green tea. It was a surprising discovery that the progress of browning can be reduced without causing deterioration by irradiation.

  A first configuration for achieving the object of the present invention includes a wavelength component of 495 to 505 nm at an irradiance of 2 μW / mL or more as an integrated value of radiant flux of 495 to 505 nm during storage at room temperature of a green tea beverage packed in a transparent container. A method for preserving a green tea beverage in a transparent container, characterized in that the green tea beverage is irradiated with colored light or white light.

  A second configuration of the present invention is the storage method according to the first configuration, wherein the colored light has an irradiance of 4 μW / mL or more.

  The third configuration of the present invention is the storage method according to the first or second configuration, wherein the colored light is blue-green light having a wavelength component of 480 to 540 nm.

  A fourth configuration of the present invention is the storage method according to the first configuration, wherein the illuminance of the white light is 1000 Lux or more.

  The fifth configuration of the present invention is a wavelength component of 495 to 505 nm with an irradiance of 15 μW / mL or more with an integrated value of radiant flux of 495 to 505 nm during storage of a transparent container-packed green tea beverage under heating at 50 ° C. or more. A method for preserving a transparent container-packed green tea beverage, wherein the green tea beverage is irradiated with colored light or white light containing

  A sixth configuration of the present invention is the storage method according to the fifth configuration, wherein the irradiance of the colored light is 30 μW / mL or more.

  A seventh configuration of the present invention is the storage method according to the fifth or sixth configuration, wherein the colored light is blue-green light having a wavelength component of 480 to 540 nm.

  According to an eighth configuration of the present invention, the illuminance of the white light is 5000 Lux or more, and the method for preserving a transparent container-packed green tea beverage according to the fifth configuration.

  The ninth configuration of the present invention is a storage room for storing a transparent container-packed green tea beverage at room temperature, and is provided in the storage chamber, and the accumulated value of radiant flux of 495 to 505 nm during storage of the green tea beverage is 2 μW / mL or more. And a means for irradiating the green tea beverage with colored light or white light containing a wavelength component of 495 to 505 nm in irradiance.

  A tenth configuration of the present invention is the storage device according to the ninth configuration, wherein the irradiance of the colored light is 4 μW / mL or more.

  An eleventh aspect of the present invention is the storage device according to the ninth or tenth aspect, wherein the colored light is blue-green light having a wavelength component of 480 to 540 nm.

  A twelfth configuration of the present invention is the storage device according to the ninth configuration, wherein the illuminance of the white light is 1000 Lux or more.

  The thirteenth configuration of the present invention is a storage room for storing a transparent container-packed green tea beverage under heating at 50 ° C. or higher, and an accumulation of 495 to 505 nm radiant flux during storage of the green tea beverage. And a means for irradiating the green tea beverage with colored light or white light containing a wavelength component of 495 to 505 nm with an irradiance of 15 μW / mL or more in value.

  A fourteenth configuration of the present invention is the storage device according to the thirteenth configuration, wherein the irradiance of the colored light is 30 μW / mL or more.

  A fifteenth configuration of the present invention is the storage device according to the thirteenth or fourteenth configuration, wherein the colored light is blue-green light having a wavelength component of 480 to 540 nm.

  A sixteenth configuration of the present invention is the storage device according to the thirteenth configuration, wherein the illuminance of the white light is 5000 Lux.

  According to the invention according to each of the above-described configurations, the progress of browning during storage of the transparent container-packed green tea beverage can be significantly reduced without adversely affecting the flavor of the green tea beverage by a simple and low-cost method and apparatus. .

  In addition, in the configuration in which the colored light is a green component containing a wavelength component of 495 to 505 nm at 2 μW / mL or more during storage at normal temperature and 5 μW / mL or more during storage under heating at 50 ° C. or more, in addition to the browning reduction effect The green tea beverage product is particularly preferable because it has the effect of improving the appearance of the product when it is displayed at a storefront by a showcase or the like.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
The object of the preservation method of the present invention is a packaged green tea beverage that is filled in a transparent container such as a PET bottle or a glass bottle and stored and stored in a showcase, a warmer, a vending machine, or the like. The green tea beverage as the contents of the container is an extract obtained by extracting green tea leaves with hot water or the like, or a diluted solution thereof.

  The present invention is characterized in that the progress of browning is reduced by irradiating light to a transparent container-packed green tea beverage, and the light to be irradiated is normal temperature with an integrated value of 495 to 505 nm radiant flux. In the case of storage, light that cannot provide irradiance of 2 μW / mL or more, such as red light or ultraviolet light, is inappropriate. In the present invention, the integrated value of radiant flux of 495 to 505 nm is 2 μW / mL or more when stored at room temperature, preferably 4 μW / mL or more, preferably 15 μW / mL or more when stored at a temperature of 50 ° C. or more, preferably As a result of experiments, it has been found that if a light containing a wavelength component of 30 μW / mL or more is irradiated, the effect of reducing browning is found. As a result, such colored light is suitable as light to be irradiated in the present invention. In particular, green light is the most preferred colored light because it has an effect of improving the appearance of the product when a transparent container-packed green tea beverage such as a PET bottle is displayed in a store such as a showcase.

The irradiance of the colored light irradiating the stored green tea beverage during storage in a showcase of a transparent container packed green tea beverage is 12 weeks at room temperature at the bottle shoulder to achieve a sufficient browning reduction effect. During storage at a temperature of 0.2 mW / cm ² or more is required, and during storage at a temperature of 50 ° C. or higher, 1.0 mW / cm ² or more is required. Below these irradiances, browning occurs and proceeds during the storage period.

  Even when white light is stored in a transparent container-packed green tea beverage at room temperature for 12 weeks, white light is emitted against the transparent container-packed green tea beverage at an illuminance of 1000 Lux or more, which exceeds the illuminance of the fluorescent light normally used in showcases, etc. It was found that the effect of reducing browning was the same as that of colored light. In addition, it was found that during storage under heating at 50 ° C. or higher, if white light is irradiated at an illuminance of 5000 Lux or higher, there is an effect of reducing browning similar to colored light.

  In one embodiment of the present invention, a storage room for storing a transparent container-packed green tea beverage, and a storage room provided at the room temperature, 2 μW / mL or more when stored at room temperature, and 15 μW when stored at a temperature of 50 ° C. or more. A container-packed green tea beverage storage device comprising means for irradiating the transparent container-packed green tea beverage with colored light excluding red light with an irradiance of / mL or more is provided.

  In another embodiment of the present invention, a storage room for storing the transparent container-packed green tea beverage, and means for irradiating the transparent container-packed green tea drink with white light at an illuminance of 1000 Lux or more provided in the storage chamber; A container-packed green tea beverage storage device is provided.

  In these container-packed green tea beverage storage devices, the storage room for storing transparent container-packed green tea beverages includes, but is not limited to, showcases, womas, vending machines, etc. installed in transparent container-packed green tea beverage stores. It is not something.

  Further, in these storage devices, the storage chamber is filled with a means for irradiating colored green tea beverages with a irradiance of 2 μW / mL or more except for red light to a transparent container or white containers with an illuminance of 1000 Lux or more. As means for irradiating the green tea beverage, a fluorescent tube or an LED lamp is provided. These irradiating means are installed at appropriate positions so that colored light or white light hits the entire container or the surface area of the container as much as possible depending on the position of the transparent container-packed green tea beverage in the storage room. When storing green tea drinks at 50 ° C. or higher for warm sales, these fluorescent tubes or LED lamps, etc. have the ability to irradiate colored light with an irradiance of 15 μW / mL or more or white light with an illuminance of 5000 Lux or more. is required.

FIG. 10 schematically shows an example of such a storage device, where 1 is a showcase for heating and selling a PET bottled green tea beverage, and 2 is a PET bottled green tea beverage. This apparatus is divided into upper and lower three stages, and a plate-like heater 3 for heating the green tea beverage to a predetermined temperature of 50 ° C. or higher, for example, 55 ° C. to 60 ° C. is disposed on the floor plate of each stage. A predetermined number of green tea beverages 2 are placed on the heater 3. Irradiation of fluorescent tubes, LEDs, etc. that irradiate green light with an irradiance of 1.0 mW / cm ² or more or white light with an illuminance of 5000 Lux or more at a predetermined interval above the top of the green tea drink at each stage. Means 4 are installed and configured to irradiate each green tea beverage. Each irradiation means is connected to a light source provided outside the showcase.

As a packaged green tea beverage, a commercially available 350 mL PET bottled green tea beverage (Itoen “Oi Ocha”) was used and stored in a storage box that can block light in an environment of 22 ° C. and 60% RH (dark) Group), a group stored in a box with a transparent cellophane on the top (white group), a group stored in a box with a red cellophane similarly (red group), a group stored in a box with a green cellophane ( Green group) and a group stored in a box with blue cellophane (blue group) are prepared, and the irradiance of light of each irradiation group other than the dark place group is about 0.23 mW / cm ² (about 1000 Lux with white light) The color difference (ΔE) was obtained by color tone measurement (Hunter L, a, b) and the flavor was evaluated.

  The spectral distribution of the used irradiation light is shown in FIG. In FIG. 1, A indicates white light, B indicates blue light, C indicates green light, and D indicates red light. Moreover, the color tone measurement results are shown in FIGS. In the figure, the L value of the color tone indicates the lightness, and the closer to 100, the more transparent it is. The a value indicates that the larger the negative value, the stronger the green color, and the smaller the negative value, the stronger the red color. The b value indicates that yellow is stronger as the positive value is larger, and blue is stronger as the positive value is smaller. As the browning of green tea proceeds, the L value decreases and the a value increases.

  From FIG. 2 to FIG. 5, the browning progress (decrease in the L value and increase in the a value) is clear in the dark group and the red group, and the color change is small in the white group, the blue group, and the green group, that is, the browning progresses. It was clearly shown that it was reduced.

When the integrated value of 495 to 505 nm is calculated at the irradiance for each wavelength of the irradiation light, the white light is 8.036 μW / cm ² , the blue light is 10.7715 μW / cm ² , and the green light is 17.8559 μW / cm ^2. , Red light is 0.6375 μW / cm ² . Although these values do not completely coincide with the magnitude of ΔE, when the green light data with the smallest ΔE is adopted, the irradiation area to the container is set to 80 cm ² , and the irradiated radiant flux is 17.85559 μW / cm ² × 80 cm ² = 1428.472 μW. Since the amount of tea liquid was 350 mL, the necessary radiant flux per tea liquid amount that hardly caused a change in color tone at 22 ° C. was 1428.272 μW ÷ 350 mL≈4.1 μW / mL.

  Further, in the evaluation of the flavor, it was confirmed that the flavor was not particularly adversely affected in the white, blue and green groups.

  The experiment of the browning reduction effect by the colored fluorescent lamp under 55 degreeC heating conditions was conducted.

As a sample, 350 ml PET bottled bottle (for cold) made by ITO EN Co., Ltd. was used. For illumination, color fluorescent lamps FL20SP (red), FL20SG (green), and FL20SB (blue) manufactured by Mitsubishi OSRAM were used. The spectral distribution of each irradiation light is shown in FIG. In FIG. 6, A indicates a blue fluorescent lamp, B indicates a green fluorescent lamp, and C indicates a red fluorescent lamp. The irradiance was all unified to 4.3 mW / cm ² . Irradiation light hit the front of the container. Storage was carried out in a constant temperature room at 55 ° C. and 10% RH.
It has been experimentally confirmed that the discoloration of the tea liquid can be based on the measurement result of absorbance at 495 nm (OD495 nm).

  FIG. 7 shows the change in OD495 nm when the tea liquid is irradiated with each color fluorescent lamp. No difference was observed in the change rate of OD 495 nm between dark storage and red fluorescent lamp irradiation, indicating that there was no effect of red fluorescent irradiation. The effect of reducing the change in OD 495 nm by the irradiation of the green fluorescent lamp and the blue fluorescent lamp was observed as compared with the preservation in the dark place.

In irradiance for each wavelength of the irradiated light, 495～505Nm integrated value, blue light 163.1706μW / cm ^2, green light 159.4403μW / cm ^2, red light is 2.3894μW / cm ^2. These values almost coincide with the amount of change at OD495 nm. When the data of green light with the smallest change in OD 495 nm is adopted, the irradiation area to the container is 80 cm ² , and the irradiated radiant flux is 159.4403 μW / cm ² × 80 cm ² = 12755.224 μW. Since the amount of tea liquid was 350 mL, the necessary radiant flux per tea liquid amount at which color change hardly occurred at 55 ° C. was 12755.224 μW ÷ 350 mL≈36.4 μW / mL.

On the other hand, the red fluorescent lamp light has an irradiance of about 166 μW / cm ² between 430 and 440 nm, which is comparable to that of green light of 495 to 505 nm, with respect to the ineffectiveness of red light irradiation. This indicates that light of 430 to 440 nm has no effect. Similarly, red fluorescent lamp light has an irradiance of about 198 μW / cm ² between 540 and 550 nm, indicating that light at 540 to 550 nm is also ineffective.

  FIG. 8 shows the results of evaluation using the taste recognition device with respect to the flavor of the 55 ° C.-2 weeks stored product in the dark and the 55 ° C./2 weeks irradiated product with the green fluorescent lamp on the basis of the refrigerated product.

  As a taste recognition device, SA402B taste recognition device manufactured by Intelligent Sensor Technology Co., Ltd. was used. According to Weber's law, it is said that anyone can be identified with a Weber ratio (concentration difference) of about 20%, so the taste recognition device SA402B estimates the difference in taste intensity using a conversion formula. It is digitized. In the mapping using the estimated numerical value, it is displayed so that the amount of taste can be identified by the density difference of one scale. In the case of FIG. 8 described above, the first main component mainly shows bitterness and miscellaneous taste, and the second main component mainly shows sourness. The results of the taste evaluation show that the taste can be discriminated between the refrigerated product and 55 ° C for 2 weeks in the dark, the refrigerated product and 55 ° C for 2 weeks in the green light irradiation product, but the 55 ° C for 2 weeks in the dark and 55 ° C for 2 weeks. The taste could not be clearly distinguished from the green light-irradiated product, and no effect of light irradiation was observed.

  The experiment of the browning reduction effect by the LED lamp in 60 degreeC heating conditions (can womar) was conducted.

  As a sample, 350 ml PET bottled bottle (for cold) made by ITO EN Co., Ltd. was used. As the LED lamp, one having a peak at 490 nm (blue green), one having a peak at 530 nm (green), and one having a peak at 590 nm (yellow) were used.

The irradiance was about 2.0 mW / cm ² . Storage was carried out for 2 weeks in the canister (temperature was about 60 ° C.).

  The measurement result of the transmission spectrum and the spectral distribution of the irradiation light source are shown in FIG. In FIG. 9, A indicates a 490 nm LED lamp, B indicates a 530 nm LED lamp, and C indicates a 590 nm LED lamp. D is the transmission spectrum of the tea liquid before storage, E is the transmission spectrum of the 490 nm LED irradiated tea liquid, F is the transmission spectrum of the 530 nm LED irradiated tea liquid, G is the transmission spectrum of the 590 nm LED irradiated tea liquid, and H is dark. The transmission spectra of the preserved tea liquid are shown.

  The light of a 590 nm (yellow) lamp that hardly contains 495 to 505 nm was not observed to have a color tone change reducing effect, and the transmission spectrum was almost the same as that stored in the dark place.

  Irradiation with light from a 490 nm (blue-green) lamp showed a clear effect, showed almost the same transmission spectrum as before storage, and it was recognized that the color tone hardly changed. Irradiation with light from a 530 nm (green) lamp was about half the effect of a 490 nm (blue green) lamp.

Since the effect of reducing the change in color tone between the blue-green lamp and the green lamp was about double, when looking for a range where the difference in irradiance was about double, blue-green was about 370 μW / in the integrated value in the range of 495 to 505 nm. cm ² and green were about 180 μW / cm ² , which was about twice the difference.

In order to obtain an appropriate irradiation amount, when the data of the blue-green side having almost no discoloration is adopted, the irradiation area to the container is set to 80 cm ² , and the irradiated radiant flux in the range of 495 to 505 nm is 372. It is 5911 μW / cm ² × 80 cm ² = 29807.288 μW. Since the amount of tea liquid was 350 mL, the required radiant flux per tea liquid amount that hardly caused a change in color tone at 60 ° C. was 29807.288 μW ÷ 350 mL≈85.2 μW / mL.

  Use a commercially available 350 mL PET bottled beverage with oxygen-absorbing ability as a container-packed green tea beverage. Place a can-wine made of Yoshikin in the room, and illuminate the upper part of the upper and lower two-stage storage rooms with white light of about 1000 Lux. A green LED lamp was attached and irradiated from above at a distance of 7 cm from the top of the bottle cap (equivalent to about 6000 Lux).

  As a result of the storage test at 55 ° C. to 60 ° C. for 2 weeks, the transmission spectra of these stored products were compared with the same beverage stored in the refrigerator for the same period as the control. As a result, as shown in the graph of FIG. 11 and the partially enlarged graph of FIG. 12, the permeability of the upper canned stored product is clearly lower than that of the refrigerated stored product as a control, around 450 to 500 nm. It was observed that browning was progressing. On the other hand, it was observed that the lower canned product preserved by irradiating the green LED lamp had reduced decrease in transmittance.

  When the change in color tone is represented by ΔE, as shown in FIG. 13, the control refrigerated product is about 1.0, the upper canned product stored is about 6.5, and the lower canned product stored is about 2. 7 and the browning reduction effect was clearly recognized by green light irradiation.

  Moreover, about the canned-can preserved product of the lower stage, the unpleasant flavor change by irradiation was not sensuously recognized.

Comparative Example 1

Using a commercially available 350 mL PET bottled beverage with oxygen absorption as a packaged beverage, stored in a storage box that can block light in an environment of 55 ° C. and 10% RH (dark place group), white on top Group stored in a box with tracing paper (white group), similarly group stored in a box with red cellophane (red group), group stored in a box with green cellophane (green group), and blue cellophane Prepare a group (blue group) stored in a box with sapphire, adjust the irradiance of light of each irradiation group other than the dark place group to about 0.21 mW / cm ² (equivalent to about 900 Lux with white light), and sample Irradiated from the lateral direction of (received in an area slightly more than twice that from the longitudinal direction). The sample was stored for 2 weeks, sampled at an arbitrary point in the middle, color difference (ΔE) was determined from color tone measurement (Hunter L, a, b), and flavor was evaluated.

  The color difference measurement results are shown in FIG. Although the color change in blue and green looks slightly less, the overall difference was unclear. In addition, as shown in FIG. 15, no significant difference in flavor was recognized between the colors.

  From the above results, it can be seen that a clear browning reduction effect cannot be obtained unless the amount of light irradiation is sufficient.

3 is a graph showing a spectral distribution of irradiation light in Example 1. It is a graph which shows the influence of the light which acts on the time-dependent change of L value during the preservation | save of the PET bottled green tea drink of Example 1. It is a graph which shows the influence of the light which acts on the time-dependent change of a value during the preservation | save of the PET bottled green tea drink of Example 1. It is a graph which shows the influence of the light which has on the time-dependent change of b value during preservation | save of the PET bottled green tea drink of Example 1. FIG. It is a graph which shows the influence of the light which has on the time-dependent change of (DELTA) E value during preservation | save of the PET bottled green tea drink of Example 1. FIG. 6 is a graph showing a spectral distribution of irradiation light in Example 2. It is a graph which shows the light absorbency change at the time of each color fluorescent lamp irradiation in Example 2. FIG. It is a graph which shows the result of the flavor evaluation by the taste recognition apparatus in Example 2. It is a graph which shows the transmission spectrum of the tea liquid in Example 3, and the spectral distribution of an irradiation light source. It is a front view which shows typically one example of the transparent container filling green tea drink preservation | save apparatus in Example 4. FIG. It is a graph which shows the influence of the light which acts on the time-dependent change of the transmittance | permeability in the preservation | save of the PET bottled green tea drink of Example 4. 12 is an enlarged graph showing the transmittance at a wavelength of 450 to 500 nm in FIG. 11. It is a graph which shows the influence of the light which acts on the time-dependent change of the color difference in the preservation | save of the PET bottled green tea drink of Example 4. It is a graph which shows the influence of the light which acts on the time-dependent change of the color difference in the preservation | save of the PET bottled green tea drink of the comparative example 1. It is a graph which shows the time-dependent change of the flavor during preservation | save of the PET bottled green tea drink of the comparative example 1.

Claims (16)

  Irradiating the green tea beverage with colored light or white light containing a wavelength component of 495 to 505 nm with an irradiance of 2 μW / mL or more as an integrated value of radiant flux of 495 to 505 nm during storage at room temperature of the transparent container-packed green tea beverage A method for preserving a green tea beverage in a transparent container.   2. The storage method according to claim 1, wherein the irradiance of the colored light is 4 [mu] W / mL or more.   The storage method according to claim 1 or 2, wherein the colored light is blue-green light having a wavelength component of 480 to 540 nm.   2. The storage method according to claim 1, wherein the illuminance of the white light is 1000 Lux or more.   During storage of a green tea beverage in a transparent container at a temperature of 50 ° C. or higher, a colored or white light containing a wavelength component of 495 to 505 nm with an irradiance of 15 μW / mL or more with an integrated value of 495 to 505 nm radiant flux A method for preserving a green tea beverage in a transparent container, characterized by irradiating the green tea beverage.   6. The storage method according to claim 5, wherein the irradiance of the colored light is 30 [mu] W / mL or more.   The storage method according to claim 5 or 6, wherein the colored light is blue-green light having a wavelength component of 480 to 540 nm.   The method for preserving a transparent container-packed green tea beverage according to claim 5, wherein the illuminance of the white light is 5000 Lux or more.   A storage room for storing the green tea beverage in a transparent container at room temperature, and a wavelength component of 495 to 505 nm with an irradiance of 2 μW / mL or more as an integrated value of the 495 to 505 nm radiant flux during storage of the green tea beverage. And a means for irradiating the green tea beverage with colored light or white light containing a transparent container-packed green tea beverage storage device.   10. The storage device according to claim 9, wherein the irradiance of the colored light is 4 [mu] W / mL or more.   The storage device according to claim 9 or 10, wherein the colored light is blue-green light having a wavelength component of 480 to 540 nm.   The storage device according to claim 9, wherein the illuminance of the white light is 1000 Lux or more.   A storage room for storing the green tea beverage in a transparent container under a temperature of 50 ° C. or higher, and an irradiance of 15 μW / mL or more provided in the storage room and an accumulated value of 495 to 505 nm radiant flux during storage of the green tea beverage And a means for irradiating the green tea beverage with colored light or white light containing a wavelength component of 495 to 505 nm.   14. The storage device according to claim 13, wherein the irradiance of the colored light is 30 [mu] W / mL or more.   15. The storage device according to claim 13, wherein the colored light is blue-green light having a wavelength component of 480 to 540 nm.   14. The storage device according to claim 13, wherein the illuminance of the white light is 5000 Lux.

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