JP5894751B2 - Bamboo shoot mushroom suppression method - Google Patents

Description

  The present invention relates to a method capable of suppressing bamboo shoots by a simple technique.

  Bamboo shoots are typical side dishes whose freshness deteriorates rapidly after harvesting, so it has been conventionally necessary to perform cooking and processing as soon as possible after harvesting. This is because the generation of carbon dioxide by breathing and ethylene gas, which is an aging hormone, is the most common category among fruits and vegetables. In addition, it is known that organic acids, sugars and some amino acids are reduced in several days of storage, leading to a decrease in taste.

  On the other hand, if it is cooked within several hours after harvesting, it can be eaten with sashimi. It is believed that the amount will increase to a moderate amount.

  The main ingredient of bamboo shoots (bitterness and astringency) is oxalic acid and homogentisic acid and their glycosides, which increase over time from harvest. Homogentisic acid among the main components of acupuncture is a material in which tyrosine contained in a large amount of bamboo shoots is altered by an enzymatic reaction. Therefore, it is possible to prevent the increase of acupuncture by heating the bamboo shoots to deactivate the enzyme (patent) Reference 1).

  For these reasons, bamboo shoots as fruits and vegetables should be provided to consumers as soon as possible after harvesting, but transportation within a few hours from harvesting to consumption is impossible outside the production area, and deterioration was suppressed by low-temperature transportation. However, the expression of agumi cannot be suppressed, and it is indispensable to remove the accum during cooking.

  On the other hand, boiled bamboo shoots produced for storage are inactivated by exposing the peeled or peeled skin to water after inactivating the enzyme by heat treatment. Thereafter, the peeled material is further exposed to water or adjusted to pH by addition of additives, and then heat sterilized to form cans or packs. However, by being exposed to water for a long time (usually 1 to 3 days) or adding an additive, the acidity is added, the flavor is dropped, and the flavor is deteriorated. Therefore, in order to produce a high-quality boiled bamboo shoot with little deterioration in flavor, it is necessary to shorten the time of water exposure for removing the squeezing as much as possible. However, it is difficult to start the water-boiled treatment within a time period after the harvest, when the germ does not appear, and a long-time water exposure and draining process is indispensable. In addition, some of the spiders exist depending on the production area, and bamboo shoots from the production area with few spears are recognized as having good quality. Improvements such as producing a savory bamboo shoot with good flavor by changing to a method that can produce a savory bamboo shoot with good taste or managing the simmering process within 5 hours after harvest. However, it has not been widely introduced due to its high cost.

JP 2010-246504 A

  However, as described above, in the conventional method for handling bamboo shoots after harvesting, the influence of bamboo shoots is unavoidable, and there is no doubt that the quality of the fruits and boiled food is limited.

  Therefore, the present invention is intended to provide a method for suppressing bamboo shoots that enables the supply of bamboo shoots with a small amount of smoke.

  The present inventor has eagerly studied a method that can provide a higher quality bamboo shoot, and as a result, found that the shoot of the bamboo shoot can be easily suppressed by irradiating visible light of a specific wavelength, and proposed the present invention. It came to do.

  That is, the method for suppressing bamboo shoots according to the present invention is characterized in that the bamboo shoots are irradiated with light having a wavelength of 550 to 810 nm to suppress an increase in the number of bamboo shoots.

  Examples of the light having a wavelength of 550 to 810 nm include yellow light, orange light, and red light.

  In order to irradiate the bamboo shoot with light having a wavelength of 550 to 810 nm, a light source that emits light having a peak in the wavelength range of 550 to 810 nm may be used to irradiate the bamboo shoot directly from the light source. , Orange or red light-transmitting film may be used to irradiate bamboo shoots with fluorescent light or sunlight, or through a cut film that selectively transmits light with a wavelength of 550 to 810 nm. The bamboo shoots may be irradiated with fluorescent light or sunlight.

  The method for producing bamboo shoots provided with these light irradiation steps is also one aspect of the present invention.

  In addition, a packaging material for bamboo shoots composed of a yellow, orange, or red light-transmitting film, and a packaging material for bamboo shoots composed of a cut film that selectively transmits light having a wavelength of 550 to 810 nm are also included in 1 of the present invention. One.

  Furthermore, a method for suppressing bamboo shoots in which the bamboo shoots are packaged with these packaging materials for bamboo shoots to suppress increase in the number of bamboo shoots is also one aspect of the present invention.

  A light irradiation apparatus that is used in the bamboo shoot suppression method and the bamboo shoot production method and includes a light source capable of irradiating the bamboo shoot with light having a wavelength of 550 to 810 nm is also provided by the present invention. It is one of.

  As the light source, (1) a yellow light LED, an orange light LED, or a red light LED; (2) a fluorescent lamp and a yellow, orange, or yellow light provided on the optical path of light emitted from the fluorescent lamp, or (3) a fluorescent lamp and a cut that selectively transmits light having a wavelength of 550 to 810 nm provided on the optical path of light emitted from the fluorescent lamp. What is provided with the film etc. are mentioned.

  Since the present invention is configured as described above, it is possible to easily and effectively suppress bamboo shoots.

The typical block diagram which shows the light irradiation apparatus which concerns on one Embodiment of this invention. The top view which shows the light irradiation part in the embodiment. 4 is a chart showing a spectrum of irradiation light of each LED used in Test 1. FIG. 4 is a graph showing the results of a sensory test in Test 1. 10 is a chart showing a spectrum of each irradiation light (transmitted light) in Test 2. 6 is a graph showing the results of a sensory test in Test 2. 10 is a chart showing a spectrum of each irradiation light (transmitted light) in Test 3. 10 is a graph showing the results of a sensory test in Test 3. 6 is a chart showing a spectrum of irradiation light of each LED used in Test 4. 10 is a graph showing the results of a sensory test in Test 4.

  The present invention is described in detail below.

  The present invention relates to a method for suppressing an increase in bamboo shoots.

  The bamboo shoots are not particularly limited as long as they are young shoots of the Gramineae bamboo subfamily, and typical edible varieties include, for example, Mosouchiku, Hachiku, Madatake, Nemagaritake, Kanzanchi and the like.

  In the present invention, in order to suppress the increase in bamboo shoots, the bamboo shoots are irradiated with light having a wavelength of 550 to 810 nm, preferably 570 to 750 nm.

  In the present invention, examples of light having a wavelength of 550 to 810 nm include colored light of yellow light, orange light, and red light. In the present invention, when light having a wavelength of 550 to 810 nm is mixed with light having a wavelength of 550 to 810 nm, the effect of suppressing an increase in bamboo shoots tends to decrease. It is preferable to irradiate the bamboo shoot only. However, light of other wavelengths may be mixed as long as the effect of suppressing the smear is not inhibited.

In the present invention, the intensity of light having a wavelength of 550 to 810 nm is not particularly limited, and an excellent suppression effect of the increase in the smear is confirmed by light having a wide range of intensity of 0.01 to 1000 μmol ⁻² s ⁻¹ . However, from the viewpoint of energy efficiency, the light intensity is preferably about 0.01 to 10 μmol ⁻² s ⁻¹ , and a sufficient agglutination suppressing effect can be obtained even with extremely weak light. More preferably, the light intensity is about ¹ μmolm ⁻² s ⁻¹ .

  As such a light source that emits light having a wavelength of 550 to 810 nm, a light source that emits light having a peak in a wavelength region of 550 to 810 nm is preferable, and among these, an LED is preferably used. Since the wavelength of the light emitted from the LED is determined by the band gap of the semiconductor, a desired single color can be obtained.

  However, the light source used in the present invention is not limited to an LED as long as it can irradiate bamboo shoots with light having a wavelength of 550 to 810 nm. For example, the light transmissive property colored yellow, orange, or red You may make it irradiate a bamboo shoot with the light, sunlight, etc. of a fluorescent lamp through a film and the cut film which selectively permeate | transmits the light of a wavelength of 550-810 nm.

  In addition, by using a translucent film colored in yellow, orange or red or a cut film that selectively transmits light having a wavelength of 550 to 810 nm as a packaging material for bamboo shoots, the bamboo shoots are thereby packaged. By doing this, it is possible to satisfactorily suppress the increase in bamboo shoots during storage and transportation.

  The materials for these films are not particularly limited, and known materials can be appropriately selected and used.

  In the present invention, it is not clear that the mechanism of suppressing the increase in spider mites by irradiating bamboo shoots with light having a wavelength of 550 to 810 nm, but the activity of the enzyme that oxidizes tyrosine to homogentisic acid has a wavelength of 550 to 810 nm. This is presumed to be suppressed by light.

  The bamboo shoots to be irradiated with light in the present invention are preferably harvested from the viewpoint of ease of handling, but the bamboo shoots are produced using the light irradiation process of the present invention as one step of the bamboo shoot production process. May be. In this case, the light irradiation process may be performed on bamboo shoots before harvesting, and as a process other than the light irradiation process, each general production process of bamboo shoots may be performed.

  In the light irradiation step, for example, a light irradiation device including a yellow light LED, an orange light LED, and / or a red light LED as a light source and a means for adjusting the light intensity is used. Thus, such a light irradiation apparatus used in the light irradiation step is also one aspect of the present invention.

  One embodiment of a light irradiation apparatus according to the present invention is illustrated in FIG.

  The light irradiation apparatus 1 illustrated in FIG. 1 includes a light emitting unit 2 that emits light, and a power supply unit 3 that supplies power so that the intensity of the light emitted to the light emitting unit 2 can be changed. Furthermore, in order to perform finer control, a determination unit 4 and a light irradiation condition setting unit 5 are provided.

  Each part will be described in detail. As shown in FIG. 2, the light emitting unit 2 is configured by laying a large number of yellow light LEDs, orange light LEDs, and / or red light LEDs 21 on one surface of a flat substrate 22.

  The power supply unit 3 supplies power so that the emission intensity can be changed independently for each LED 21.

  The discriminating unit 4 discriminates, for example, the type and state of the bamboo shoot 6 that is a light irradiation target, based on an input by an operator.

  The light irradiation condition setting unit 5 generates an external control signal for setting the light emission intensity and the irradiation time according to the type and state of the bamboo shoot 6 and transmits the external control signal to the power supply unit 3. is there. Specifically, for example, the control signal specifying data storage unit D1 storing a pair of an identifier indicating the type / status of the bamboo shoot 6 and the identifier of the external control signal is accessed, and the type / status, etc. of the bamboo shoot 6 is accessed. A corresponding external control signal is specified, and the external control signal is transmitted to the power supply unit 3.

  In addition, the discrimination | determination part 4, the light irradiation condition setting part 5, and the control signal specific data storage part D1 are comprised using the information processing apparatus 7 in this embodiment. The information processing device 7 includes, for example, a CPU, an internal memory, an external storage device such as an HDD, a communication interface such as a modem, a display, input means such as a mouse and a keyboard, and the like. Then, the CPU and its peripheral devices are operated according to a program set in a predetermined area such as an internal memory or an external storage device, thereby functioning as a determination unit 4, a light irradiation condition setting unit 5, and a control signal specifying data storage unit D1. Is configured to do. The information processing apparatus 7 may be a general-purpose computer or a dedicated computer.

  In addition, as a light source provided in the light emission part 2 of the light irradiation apparatus 1 which concerns on the said embodiment, it replaces with LED21 and a yellow, orange, or red translucent film, 550-810 nm is provided on the light emission surface side. It may be a fluorescent lamp or the like provided with a cut film that selectively transmits light having a wavelength of.

  Bamboo shoots are harvested from 2 weeks to 1 month at the bamboo shoot production area. In large production areas, it is necessary to temporarily store bamboo shoots that are brought in one after another. In order to produce high-quality boiled bamboo shoots, it is required to make the time from harvesting to processing as short as possible. For this reason, a factory is set up near the production area, and equipment and people are fully operational for 24 hours to produce boiled bamboo shoots. However, in the conventional method for handling bamboo shoots, the acrid components are already expressed during the boiled processing, so that the acrid removal process by the water exposure process cannot be avoided and the flavor deterioration becomes unavoidable. By adopting the light irradiation device as described above that embodies the present invention in this temporary storage place, it becomes possible to suppress the smudge even in the conventional processing time, it is not necessary to shorten the temporary storage time, and there is a margin. Can be processed. Moreover, it is also possible to transport bamboo shoots with the film of the present invention immediately after harvesting, and to suppress the expression of the sea urchin from a farther production area than before. Furthermore, the removal process can be omitted, thereby shortening the processing time and improving the quality of the boiled bamboo shoots.

  Furthermore, by putting such a light irradiation device in a refrigerator and storing it at a low temperature, or combining it with a CA device (Controlled Atmosphere) that controls the oxygen concentration to 2 to 15% as disclosed in Utility Model No. 2598721, It is possible to prevent deterioration of freshness as well as suppression of smears, and it is considered that higher quality storage becomes possible.

  Alternatively, by storing using a film bag capable of controlling the oxygen concentration as described above, a MA (Modified Atmosphere) effect can be expected, and there is a possibility of high-quality freshness-keeping storage packaging that does not require a CA device. .

  The present invention will be described in more detail with reference to the following examples. However, the present invention is not limited to these examples.

<Test 1>
A bamboo shoot from Kurematsu, Shizuoka Prefecture, immediately after harvesting was used as a sample and kept for about 24 hours at room temperature (16 ° C.) and humidity of 90% according to the following four conditions.

The light irradiation conditions in this test are as follows.
Condition D: Dark (no light irradiation)
Condition R: Continuous irradiation of red light (peak wavelength: 645 nm) Condition G: Continuous irradiation of green light (peak wavelength: 525 nm) Condition B: Continuous irradiation of blue light (peak wavelength: 480 nm) LED is used as the light source in conditions R to B The intensity of each irradiation light was about ¹ to 10 μmol ⁻² s ⁻¹ . In addition, the spectrum chart of the irradiation light of each LED was shown to Fig.3 (a)-(c).

  The bamboo shoots after the treatment were peeled, boiled with boiling water for 30 minutes, cooled with running water for 15 minutes, and subjected to a sensory test. In the sensory test, panelists (n = 3) ate bamboo shoots that had been sufficiently cooled, and evaluated the agglutination. The evaluation criteria in the sensory test are shown in Table 1, and the results are shown in the graph of FIG.

  From the results shown in FIG. 2, it was found that the number of bamboo shoots was remarkably small when irradiated with red light.

<Test 2>
Using bamboo shoots from the Enshu area of Shizuoka prefecture immediately after harvest as a sample, and at room temperature (17 ° C.), according to the following four conditions, the transmitted light intensity is 0.1 to ¹ μmol ⁻² s ⁻¹ using the indoor fluorescent lamp as the light source. For about 48 hours.

The light irradiation conditions in this test are as follows.
Condition D: Covered with aluminum foil Condition R: Covered with red colored polyester film Condition B: Covered with blue colored polyester film K: Covered with transparent polyethylene film (uncolored) The spectrum chart of light and each transmitted light is shown in FIGS.

  The bamboo shoots after the treatment were subjected to a sensory test in the same manner as in Test 1. The results are shown in the graph of FIG.

  From the results shown in FIG. 6, it was found that the number of bamboo shoots was remarkably small when covered with a polyester film colored in red.

<Test 3>
Taking bamboo shoots from the Enshu area of Shizuoka prefecture immediately after harvest as a sample, and at room temperature (18 ° C.), the transmitted light intensity was 0.1 to ² μmol ⁻² s ⁻¹ using a room fluorescent lamp as a light source according to the following four conditions. For about 48 hours.

The light irradiation conditions in this test are as follows.
Condition R: Covered with a polyester film colored in red Y: Covered with cellophane colored in yellow Note that the emission chart of fluorescent lamps and the spectrum chart of each transmitted light are shown in FIGS. .

  The bamboo shoots after the treatment were subjected to a sensory test in the same manner as in Test 1. The results are shown in the graph of FIG.

  From the results shown in FIG. 8, it was found that even when covered with cellophane colored in yellow, the increase in smear can be satisfactorily suppressed as in the case of coating with a polyester film colored in red.

<Test 4>
Take bamboo shoots from the Enshu area of Shizuoka Prefecture immediately after harvest as a sample, and at room temperature (20 ° C.), according to the following four conditions, using an LED as a light source, the light intensity of 0.01 to 0.3 μmol ⁻² s ^-1 and continuous irradiation for about 48 hours.

Condition G: green light (peak wavelength: 525 nm)
Condition YG: Yellowish green light (peak wavelength: 545 nm)
Condition Y: yellow light (peak wavelength: 565 nm)
Condition A: orange light (peak wavelength: 590 nm)
In addition, the spectrum chart of the irradiation light of each LED was shown to Fig.9 (a)-(d).

  The bamboo shoots after the treatment were peeled and then sliced to a thickness of about 5 mm, heated in a microwave oven and sufficiently cooled, and subjected to a sensory test. The results are shown in the graph of FIG.

  From the results shown in FIG. 10, it was found that the number of bamboo shoots was small when yellow light was irradiated and then when orange light was irradiated.

Claims (8)

  A method for suppressing bamboo shoots, wherein the bamboo shoots are irradiated with light having a wavelength of 550 to 810 nm to suppress an increase in the number of bamboo shoots.   2. The method for suppressing bamboo shoot smear according to claim 1, wherein the light having a wavelength of 550 to 810 nm is yellow light, orange light, or red light.   3. The method for suppressing bamboo shoots in a bamboo shoot according to claim 1 or 2, wherein the bamboo shoots are irradiated with light through a yellow, orange or red translucent film.   3. The method for suppressing bamboo shoots according to claim 1 or 2, wherein the bamboo shoots are irradiated with light through a cut film that selectively transmits light having a wavelength of 550 to 810 nm.   A method for producing bamboo shoots, comprising a step of irradiating the bamboo shoots with light having a wavelength of 550 to 810 nm to suppress an increase in the number of bamboo shoots.   A packaging material for bamboo shoots for packaging bamboo shoots, comprising a cut film that selectively transmits light having a wavelength of 550 to 810 nm.   A bamboo shoot wrapping method using the packaging material for bamboo shoots according to claim 6, wherein an increase in bamboo shoots is suppressed. It is used for the method according to claim 1, 2, 3, 4 or 5,
  A light source capable of irradiating bamboo shoots with light having a wavelength of 550 to 810 nm,
  The light source includes a fluorescent lamp and a cut film that selectively transmits light having a wavelength of 550 to 810 nm provided on an optical path of light emitted from the fluorescent lamp. Irradiation device.