JPH0928363A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator capable of reducing the lowering of a chlorophyll concentration in green leaf vegetables by carrying out the weak irradiation with an irradiating means when hermetically closing the interior of the refrigerator. SOLUTION: This refrigerator is obtained by installing a daylight fluorescent lamp 30 in nearly the central part on the undersurface of a partition wall 12B for dividing a vegetable chamber 18 from a refrigerating chamber 16 of the refrigerator 10, attaching a lamp 32 on the front side on the undersurface of the partition wall 12B, changing over a switch 28 by opening and closing a drawer 24 of the vegetable chamber 18 and assembling an electric circuit so as to light the daylight fluorescent lamp 30 when the drawer 24 is kept in a hermetically closed state and light the lamp 32 and put out the daylight fluorescent lamp 30 when the drawer 24 is opened.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a refrigerator, and more particularly to a refrigerator suitable for cold storage of green leafy vegetables.

[0002]

2. Description of the Related Art In green leafy vegetables containing chlorophyll in their leaves, a decrease in chlorophyll concentration after harvest leads to a decrease in quality. For this reason, studies have been conducted so far to prevent the decrease in chlorophyll concentration by irradiating light after harvest on komatsuna or on tissue culture seedlings stored at low temperature.

By the way, in the conventional vegetable storage room provided in the refrigerator, no lighting means is attached, or even if the lighting means is attached, the lighting means is turned on only when the door is opened. Light irradiation could not be performed when the room was closed.

[0004]

An object of the present invention is to provide a refrigerator capable of reducing the decrease in chlorophyll concentration of green leafy vegetables after harvest, which causes deterioration in quality.

[0005]

In the refrigerator according to the present invention, the irradiation means performs weak light irradiation when the interior of the refrigerator is closed. This reduces the decrease in the chlorophyll concentration of green leafy vegetables, which causes the deterioration of quality.

Here, weak light irradiation means that the photosynthetic effective photon flux density is 1 μmol · m ⁻² · s ⁻¹ or more and 10 μmol · m ⁻² ·.
Light irradiation of s ^-1 or less. Further, the temperature in the refrigerator is preferably 1 ° C or higher and 10 ° C or lower.

[0007]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. In the figure, the arrow FR indicates the front.

FIG. 4 shows a refrigerator 1 according to an embodiment of the present invention.
A schematic of 0 is shown. The refrigerator 10 includes a housing 12 having an open front surface, and the interior of the housing 12 is divided into three chambers vertically arranged, that is, an upper chamber 14 by partition walls 12A and 12B arranged in the lateral direction. , Chamber 16,
It is divided into the lower chamber 18. Opening and closing doors 20 and 22 are attached to the opening sides of the upper chamber 14 and the middle chamber 16, respectively.

Further, the lower chamber 18 accommodates a drawer 24 which mainly stores vegetables and the like. The drawer 24 has a substantially housing shape with an open top, and the front wall 26 on the front side is the lower chamber 1.
8 is larger than the opening portion of the front wall 26, and when the drawer 24 is accommodated in the lower chamber 18, the side surfaces 26A and 26B of the front wall 26, the lower surface 2
6C are side surfaces 12C, 12D, and bottom surface 1 of the housing 12, respectively.
It is located on the same plane as 2E.

A switch 28 for detecting opening / closing of the drawer 24 is attached to a portion of the housing 12 with which the front wall 26 abuts.

A white fluorescent lamp 30 is attached to the lower surface of the partition wall 12B for partitioning the middle chamber 16 and the lower chamber 18, and a lamp 32 is provided on the front side of the lower surface of the partition wall 12B.
Is installed.

FIG. 2 shows an electric circuit for supplying power to the white fluorescent lamp 30 and the lamp 32. The switch 28 and a power supply circuit 34 that supplies power to the white fluorescent lamp 30 and the lamp 32 are connected in series,
The power supplied from the power supply circuit 34 is supplied to the white fluorescent lamp 30.
The power supply adjusting circuit 36 for adjusting the power supply suitable for the above and the white fluorescent lamp 30 and the lamp 32 are connected in parallel, and the white fluorescent lamp 30 and the lamp 32 are alternately turned on / off by switching the switch 28. That is, the front wall 26 is the housing 1
When the drawer 24 is in contact with, in other words, the drawer 24 is housed and sealed in the lower chamber 18, the white fluorescent lamp 3
0 is on and the lamp 32 is off, the front wall 26 is the housing 1
2 is not in contact, in other words when the drawer 24 is open, the lamp 32 is on and the white fluorescent lamp 3
0 goes out.

A refrigerating device or a refrigerating device (not shown) is attached to the housing 12, and the upper chamber 14 and the middle chamber 1
6. The lower chamber 18 is maintained at a predetermined temperature by the refrigerating device or the refrigerating device.

By the way, the temperature in the lower chamber 18 and the degree of light irradiation by the white fluorescent lamp 30 which are effective in reducing the decrease in the chlorophyll concentration of the green leafy vegetables after harvesting can be obtained from the following experiment.

In this experiment, as the green leafy vegetables, kaiware radish produced by Gyubezawa Horticultural Co., Ltd., which was cultivated, harvested and shipped under the conditions shown in Table 1, was used.

[0016]

[Table 1]

Further, as shown in Table 2, four test sections were provided by combining the PL section and PD section in the pretreatment described later and the SL section and SD section in the low temperature storage test. Further, in each test section, six shipments of radish radish, that is, the roots are supported by a sponge-like support material, and the leaves are housed in a square tubular plastic container with an open upper part, A kaiware radish whose upper part was covered with a transparent film was used.

[0018]

[Table 2]

In the pretreatment, the kaiware radish was left in a chamber set at a room temperature of 20 ° C. for one day in order to simulate the temperature at the store. In this pretreatment, a section irradiated with light (PL section) and a section not irradiated with light (PD section) were provided. In the PL section, the photosynthetic effective photon flux density (hereinafter, PP) at the height above the leaf surface (the average height of the upper surface of the leaf).
It is called FD. ) Was 50 μmol · m ⁻² · s ^−1, and continuous irradiation was performed for 1 day.

After completion of the pretreatment, a low temperature storage test was conducted. In the low temperature storage test, the radish radish was stored for 16 days in a refrigerator set at room temperature of 5 ° C. In this low temperature storage test, a section irradiated with light (SL section) and a section not irradiated with light (SD section) were provided. In the SL plot, continuous irradiation was performed during storage so that the PPFD at the height above the leaf surface was 5 μmol · m ⁻² · s ⁻¹ .

A white fluorescent lamp was used as a light source both during the pretreatment and during the cold storage test. In addition, water was given to the radish radish every 2-3 days to such an extent that it did not wither during the low temperature storage test.

Immediately before the pretreatment {0 day after the start of the test (0 day after the start of the test)} and immediately after the end of the low temperature storage test {17 day after the start of the test (17 day after the start of the test)}, the shoot (stem) fresh weight and shoot Dry matter weight, shoot dry matter ratio, plant height and chlorophyll concentration per leaf dry matter were measured. Further, the plant height was measured immediately after the completion of the pretreatment (one day after the start of the test).

The test results are shown in Table 3 and FIGS.

[0024]

[Table 3]

In the figure, no significant difference was observed by the LSD (Analysis of Variance) test (P = 0.05, that is, a significance level of 5%) in the test sections to which the same English letters were attached. Further, the length of the vertical line of the T-shape in the figure corresponds to the standard deviation.

As shown in FIG. 3, the chlorophyll concentration on the 17th day of the test was PL-SL, PD-SL and P.
Chlorophyll concentration per leaf dry weight of the radish radish in the PL-SL group that was irradiated with light during the pretreatment and during the low-temperature storage test in the order of the L-SD group and the PD-SD group in the order 0 day after the start of the test. No significant difference was observed by the LSD (Analysis of Variance) test (P = 0.05) compared with the chlorophyll concentration per leaf dry weight of the Japanese radish. Also, PD-SL irradiated with light during the low temperature storage test
The chlorophyll concentration per leaf dry weight of the radish radish in the plot and the chlorophyll concentration per leaf dry weight of the radish in the PL-SL plot were LSD test (P =
No significant difference was observed at 0.05).

Further, as shown in FIG. 4, the test start 1
PL- which was not irradiated with light during the cold storage test on the 7th day
Although yellowing of the leaves was observed in the SD and PD-SD groups (the white part in FIG. 4 is mainly based on the yellowing of the leaves), the PL-SL group that was irradiated with light during the low temperature storage test and the PD-
No yellowing of the leaves was observed in the SL plot.

From the above, it can be seen that the decrease in the chlorophyll concentration of the radish radish in the test section (SL section) irradiated with light during the low temperature storage test is reduced. Further, it can be seen that even in the pretreatment, the reduction of the chlorophyll concentration can be further reduced by performing the light irradiation.

As shown in FIG. 5, on the first day from the start of the test, the plant height of PD plots not irradiated with light during pretreatment was larger than that of PL plots exposed to light during pretreatment. On the 17th day from the start of the test, the plant heights of PD-SD and PL-SD sections which were not irradiated with light during the low temperature storage test were PD-SL and PL-SL which were irradiated with light during the low temperature storage test.
It is larger than the height of the ward. In addition, PD-SD,
In the PL-SD group, the hypocotyl and petiole were significantly elongated, and the leaf reached the film on the upper surface of the container, and slime and decay were observed in the leaf. From this, it is effective to maintain the quality of plants that are stored and stored in a container whose upper surface is covered with a film, such as the Japanese radish, to suppress the growth of plant height so that the leaves do not touch the film. It can be seen that light irradiation can suppress the growth of plant height.

As shown in Table 3, on the 17th day from the start of the test, the shoot fresh weight was larger than the shoot fresh weight on the 0th day from the start of the test in all test plots, and light irradiation was performed during the low temperature storage test. The shoot weights of PD-SD and PL-SD sections that were not performed were irradiated with light during the low temperature storage test.
The weight of shoots in the D-SL and PL-SL sections is larger than the fresh weight. This is probably because the relative humidity in the container is 90% or higher, and the water absorption rate is higher than the transpiration rate. Also, the light irradiation is better than the case without light irradiation. It is considered that transpiration was promoted.

Regarding the shoot dry matter weight, no significant difference was observed by the LSD test (P = 0.05) between the shoot dry matter weight on the 0th day of the test and the shoot dry matter on the 17th day of the test. It was Furthermore, the shoot dry matter ratio of all the test plots on the 17th day of the test start was smaller than that on the 0th day of the test start, and the PD-SL and PL-SL plots irradiated with light during the low temperature storage test. The shoot-to-dry matter ratio of the PD-SD which was not irradiated with light during the cold storage test,
It can be seen that it is larger than the shoot dry matter ratio in the PL-SD section.

The same result as the above experiment is obtained when the temperature in the lower chamber 18 is 1 ° C. to 10 ° C. and the PPFD is 1 μmol · m ⁻² · s.
⁻¹ or more and 10 μmol · m ⁻² · s ⁻¹ or less was obtained by irradiation with weak light.

From the above, PPFD of 1 μmol · m ⁻² · s ⁻¹ or more and 10 μmol using the refrigerator 10 according to the present embodiment.
・ When stored at low temperature of 1 ℃ to 10 ℃ under low light irradiation of m ^-2 s ^-1 or less, decrease of chlorophyll concentration of green leafy vegetables can be reduced, and by extension, the quality of green leafy vegetables can be effectively maintained. it can.

The mounting position of the white fluorescent lamp 30 can be changed. For example, the white fluorescent lamp 3 can be attached to the inner wall of the drawer 24.
0 may be attached.

In the above embodiment, the white fluorescent lamp 30 and the lamp 32 are alternately turned on. However, the white fluorescent lamp 30 is omitted only when the drawer 32 is omitted and the drawer 24 is housed in the lower chamber 18. May be turned on, or the white fluorescent lamp 30 may be turned on at all times by omitting the lamp 32 and the switch 28.

Further, the refrigerator 10 according to this embodiment may be used not only for storing cell seedlings such as radish radish used in the above experiment but also for green leafy vegetables without roots.

[0037]

INDUSTRIAL APPLICABILITY According to the present invention, by performing weak light irradiation,
It has an excellent effect that it is possible to prevent a decrease in the chlorophyll concentration of green leafy vegetables which causes a deterioration in quality.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of a refrigerator according to this embodiment.

FIG. 2 is a diagram showing a white fluorescent lamp used in the refrigerator of FIG. 1 and an electric circuit for turning on / off the lamp.

FIG. 3 is a graph showing the chlorophyll concentration per leaf dry matter weight of each plot on day 0 and day 17 of the test.

FIG. 4 is a diagram showing a state of a radish radish in each section viewed from the top on the 17th day from the start of the test.

FIG. 5 is a graph showing the relationship between the number of days after the start of the test and the plant height of each test plot.

[Explanation of symbols]

 10 Refrigerator 24 Drawer 28 Switch 30 White fluorescent lamp

Claims (1)

[Claims] 1. A refrigerator provided with an irradiation means for performing weak light irradiation when the inside of the refrigerator is closed.