Method for cultivating sparassis crispa containing high concentrations of vitamin d and method for enhancing vitamin d in sparassis crispa

Abstract

To provide a method for cultivating Sparassis crispa to increase a vitamin D content even in its raw state, and to provide a method for enhancing vitamin D in Sparassis crispa.SOLUTION: By continuously irradiating growing Sparassis crispa fruiting bodies or harvested raw Sparassis crispa with ultraviolet light for 4 to 24 hours, a vitamin D content in raw Sparassis crispa, which previously contained no vitamin D, is increased to 260.0 μg / 100 g to 723.0 μg / 100 g.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for cultivating Hanabiratake mushrooms containing high concentrations of vitamin D and a method for enhancing vitamin D in Hanabiratake mushrooms. [Background technology]

[0002] Hanabiratake mushrooms are a mushroom of the genus Hanabiratake, belonging to the family Mytilaceae. In nature, they grow at the base of dead coniferous trees such as fir and pine from summer to autumn, but the amount they grow in the wild is extremely small, and they have rarely been sold in the market until now. However, in recent years, techniques for cultivating Hanabiratake mushrooms on sawdust beds have been developed, and stable production of Hanabiratake mushrooms is being established.

[0003] For example, Japanese Patent Application Laid-Open No. 11-56098 discloses a method for preparing a mushroom bed for artificial cultivation of Hanabiratake mushroom, which is characterized by heating sawdust or chips primarily composed of larch wood, or a mixture containing these, in the presence of water, removing hot water-soluble components, and then adding nutrients (Patent Document 1).

[0004] Furthermore, Japanese Patent Application Laid-Open No. 2005-52068 discloses a method for cultivating Hanabiratake mushrooms, which is characterized by inoculating a solid medium with mycelium obtained by liquid culture as seed culture (Patent Document 2).

[0005] Furthermore, Japanese Patent Application Laid-Open Publication No. 2007-104996 discloses a method for cultivating hanabiratake mushrooms, in which the mushrooms are cultivated in a container filled with an artificial medium based on coniferous trees, the container is placed inside a solenoid-shaped conductor, and a pulse current with a pulse width of 3 to 20 microseconds is passed through to generate a magnetic field of 300 to 500 gauss, thereby promoting the growth of the mushrooms (Patent Document 3). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 11-56098 [Patent Document 2] Japanese Patent Application Laid-Open No. 2005-52068 [Patent Document 3] Japanese Patent Application Laid-Open No. 2007-104996 Summary of the Invention [Problem to be solved by the invention]

[0007] Hanabiratake mushrooms are rich in beta-glucans, which are said to boost immunity, as well as dietary fiber and amino acids, making them highly sought after as supplements. They also have a mild texture, a distinctive mushroom aroma similar to that of matsutake mushrooms, and retain their shape even when boiled, with a crunchy, crunchy texture that makes them suitable as an ingredient in hot pots. Hanabiratake mushrooms are therefore excellent edible mushrooms both in terms of nutrition and as a food ingredient.

[0008] However, raw Hanabiratake mushrooms do not contain vitamin D. While it is possible to increase the vitamin D content of Hanabiratake mushrooms by sun-drying them, like dried shiitake mushrooms, this would diminish the unique texture and flavor of Hanabiratake mushrooms.

[0009] Therefore, an object of the present invention is to provide a method for cultivating Hanabiratake mushrooms and a method for enhancing vitamin D in Hanabiratake mushrooms, which can increase the vitamin D content even when the mushrooms are raw. [Means for solving the problem]

[0010] The inventors conducted various studies to solve the above-mentioned problems and discovered that the vitamin D content in raw Hanabiratake mushrooms can be dramatically increased by irradiating the fruiting bodies of Hanabiratake mushrooms or fresh Hanabiratake mushrooms after harvest with ultraviolet light, thereby realizing that the above-mentioned problems can be solved.

[0011] The present invention was made based on such findings and provides a method for cultivating Hanabiratake, which comprises irradiating ultraviolet light onto growing Hanabiratake fruiting bodies or onto fresh Hanabiratake after harvest.

[0012] The present invention also provides a method for enhancing vitamin D in Hanabiratake, which comprises irradiating the fruiting bodies of Hanabiratake during growth or fresh Hanabiratake after harvest with ultraviolet light. [Effects of the Invention]

[0013] According to the method for cultivating Hanabiratake of the present invention, the vitamin D content of raw Hanabiratake can be significantly increased without sun-drying. Specifically, although Hanabiratake does not originally contain vitamin D, the vitamin D content of raw Hanabiratake obtained by the cultivation method of the present invention can be increased to 260.0 μg / 100 g to 723.0 μg / 100 g. [Brief explanation of the drawings]

[0014] The drawings illustrate particular embodiments of the present invention, including essential features of the invention as well as alternative and preferred embodiments. [Figure 1] A graph showing a comparison of the amount of vitamin D produced by ultraviolet light exposure. DETAILED DESCRIPTION OF THE INVENTION

[0015] DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will now be described in detail. A method for cultivating Hanabiratake according to an embodiment of the present invention is characterized in that ultraviolet light is irradiated onto Hanabiratake during growth or onto fresh Hanabiratake after harvest.

[0016] In this embodiment, ultraviolet light refers to a type of electromagnetic wave (light) with a dominant wavelength in the range of 100 to 400 nm. Of these, the range of 100 to 200 nm is called far ultraviolet light, and the range of 200 to 400 nm is called near ultraviolet light. In this embodiment, near ultraviolet light is used to enhance vitamin D. In this embodiment, mid-wavelength ultraviolet light (UV-B) in the 280 to 320 nm range is particularly preferred because it enhances vitamin D.

[0017] Other than irradiating ultraviolet light onto Hanabiratake growing in a fungal bed medium or onto fresh Hanabiratake after harvest, known Hanabiratake cultivation methods can be used. That is, the series of steps of medium preparation, packaging, sterilization and cooling, inoculation, culture, development treatment, and harvesting can be performed using conventionally known Hanabiratake cultivation methods. In an embodiment of the present invention, ultraviolet light is irradiated from the stage when the fruiting bodies of Hanabiratake begin to grow after development treatment.

[0018] There are no particular limitations on the method of ultraviolet irradiation, but examples include a method in which ultraviolet rays are irradiated from the side of the Hanabiratake on a fungal bed cultivation shelf using an ultraviolet irradiation device, or a method in which an ultraviolet irradiation device is installed on a fungal bed cultivation shelf along with lighting and ultraviolet rays are irradiated from above the Hanabiratake fruiting bodies. Another example is a method in which, after harvesting, the Hanabiratake are arranged on a tray or platter and ultraviolet rays are irradiated from above the Hanabiratake fruiting bodies. In this case, it is preferable to turn the tray over halfway through so that the entire surface is evenly irradiated with ultraviolet rays.

[0019] A commercially available ultraviolet irradiation device can be used, and examples thereof include an ultraviolet fluorescent lamp or ultraviolet fluorescent tube that emits ultraviolet light of 300 to 400 nm, and an ultraviolet LED that emits ultraviolet light with a wavelength of 400 nm or less.

[0020] When exposed to ultraviolet light for at least four hours, an increase in vitamin D content in the fruiting bodies of the bamboo shoots is observed, and the amount of vitamin D produced increases depending on the exposure time. However, since the amount of vitamin D produced reaches a plateau after 16 consecutive hours, the upper limit is set at 16 hours. Furthermore, repeated short-term exposure can also increase the amount of vitamin D produced.

[0021] In this embodiment, after harvesting the fruiting bodies of the Hanabiratake mushroom, the raw Hanabiratake mushrooms can be irradiated with the above-mentioned ultraviolet light to obtain a similar effect of increasing the vitamin D content. The ultraviolet light irradiation conditions are the same as those for irradiating the fruiting bodies of the Hanabiratake mushrooms during growth. [Example]

[0022] 1. UV treatment of fresh hanabiratake mushrooms after harvest Freshly harvested Hanabiratake mushrooms were exposed to UV light as follows. Hanabiratake mushrooms (variety name: KSC-H16) were cultivated on fungal beds according to standard methods, and after harvesting (harvesting), they were washed and drained in their original state. Next, the Hanabiratake mushrooms were cut into 15mm cubes, and approximately 4kg of them were placed in a tray and leveled. A UV-B fluorescent tube (TUNP-AG120-UVB100%-23W-SE, manufactured by Japan Magnet Co., Ltd.) was set in the irradiation device, and the irradiation distance was set to 10-15cm, and UV light was applied continuously for 4, 8, or 24 hours. The mushrooms were turned over every 4 hours.

[0023] For comparison, raw Bunashimeji mushrooms (commercially available from JA Zennoh Nagano), raw Shiitake mushrooms (variety name: Mori XR1), and raw Maitake mushrooms (commercially available from Hokuto) were also subjected to the same ultraviolet irradiation treatment.

[0024] 2. Measurement of Vitamin D Production in Raw Hanabiratake The amount of vitamin D produced was measured by the Japan Food Research Laboratories (JFRC). The results are shown in Figure 1. As shown in Figure 1, the amount of vitamin D produced in raw Hanabiratake mushrooms was 0 μg / 100 g after 0 hours of irradiation, but it was found to increase significantly to 260.0 μg / 100 g after 4 hours of UV irradiation, 651.0 μg / 100 g after 8 hours of irradiation, and 723.0 μg / 100 g after 24 hours of irradiation.

[0025] On the other hand, the amount of vitamin D produced by Bunashimeji, Shiitake, and Maitake mushrooms also tended to increase, but the degree of increase was small compared to Hanabiratake. In particular, the amount of vitamin D produced by Maitake mushrooms tended to decrease after peaking after 8 hours of UV exposure.

Claims

1. The method is characterized by irradiating ultraviolet rays onto growing Hanabiratake fruiting bodies or fresh Hanabiratake after harvesting. How to grow Hanabiratake.

2. 2. The method for cultivating matsutake mushrooms according to claim 1, wherein the ultraviolet irradiation time is 4 to 24 hours.

3. The method for cultivating matsutake mushrooms according to claim 1 or 2, wherein the dominant wavelength of the ultraviolet light is 200 to 400 nm.

4. The method is characterized by irradiating ultraviolet rays onto growing Hanabiratake fruiting bodies or fresh Hanabiratake after harvesting. How to increase vitamin D with Hanabiratake mushrooms.

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