JP2008237108A - Method for eliminating feed-contaminating mycotoxin through irradiation with ultraviolet ray, and apparatus for eliminating mycotoxin through irradiation with ultraviolet ray - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for eliminating mycotoxin through irradiation with ultraviolet ray, which comprises means for efficiently eliminating mycotoxin in feed. <P>SOLUTION: The apparatus for eliminating mycotoxin 1 includes a cylindrical container 3 for housing feed 2, and an ultraviolet irradiating device 4 disposed so as to irradiate the inside of the cylindrical container 3 with ultraviolet rays. The ultraviolet irradiating device 4 has a concave-surface reflection board 6 having a rotary paraboloidal reflection surface 5, and an ultraviolet light source 7 disposed on the focal spot of the paraboloid. Ultraviolet lights from the ultraviolet light source 7 are reflected by the concave-surface reflection board 6 to be oriented in one direction, and reaches the feed 2 in the cylindrical container as parallel ultraviolet lights 8. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for removing mycotoxins in feed contaminated with mycotoxins and an apparatus therefor.

  Mycotoxin is a general term for toxic substances produced by toxic fungi. Feeds severely contaminated with mycotoxins derived from harmful fungi not only have no feeding value, but also cause livestock growth and breeding problems, as well as lower quality of livestock products.

  Ultraviolet irradiation is used as a sterilization and fungicidal treatment method for foods (Japan Agricultural Research Quarterly, 40, 157-161, 2006).

  It has been reported that UV irradiation attenuates the mutagenicity of aflatoxins and eliminates zearalenone and deoxynivalenol (both are mycotoxins contaminated with cereals and silage and are regulated). (Acta biol. Med germ., Band 38, Seite 1239-1242 (1979)).

Japan Agricultural Research Quarterly, 40, 157-161, 2006 Acta biol. Med. Germ., Band 38, Seite 1239-1242 (1979)

  However, no examples have been reported so far in which ultraviolet irradiation is applied to attenuate or remove mycotoxins in feed.

  If a method for removing mycotoxins in the feed is established, it will be possible to effectively use the mycotoxin-contaminated feed that has been conventionally discarded as a feed. In addition, the health of livestock can be improved, and the reliability of livestock products is also increased. Therefore, development of a technique for removing mycotoxins from contaminated feed has been desired.

  Then, an object of this invention is to provide the means for removing efficiently mycotoxin in feed.

As a result of intensive studies, the present inventors have completed the following invention.
The present invention is an apparatus for removing mycotoxins in feed contaminated with mycotoxins, a container for containing the feed, and an ultraviolet irradiation apparatus arranged to irradiate the interior of the containers with ultraviolet light The mycotoxin removing apparatus comprising:

  It is preferable that the container has an opening on the upper side. The ultraviolet irradiation device preferably includes an ultraviolet light source that generates ultraviolet light and a reflector that reflects the reflected ultraviolet light and directs the reflected ultraviolet light toward the inside of the container. The ultraviolet rays from the light source and the ultraviolet rays reflected by the reflecting plate are typically irradiated to the feed accommodating portion inside the container through the opening of the container. As the reflector, a concave reflector is preferable. Among the concave reflectors, a concave reflector having a concave parabolic reflection surface or a concave reflector having a spheroidal concave reflection surface is preferable. A rotating paraboloid is a surface formed when a parabola rotates about an axis. The parabola may be a part thereof, for example, a parabola cut by a line orthogonal to the axis of the parabola. The rotating paraboloid can direct light from an ultraviolet light source placed on the focal point in one direction. When the reflecting plate has a rotating parabolic reflecting surface, the light source is preferably disposed at or near the focal point of the rotating paraboloid of the reflecting surface. A spheroidal surface is a surface formed when an ellipse rotates about a major axis. An ellipse may be part of it, for example an ellipse cut by a minor axis or a line parallel thereto. The spheroid can focus light from an ultraviolet light source placed on the first focal point onto the second focal point. When the reflecting plate has a spheroid reflecting surface, the light source is preferably arranged at or near the first focal point of the spheroid of the reflecting surface. In this case, it is preferable that the container is configured such that when the feed is accommodated, all or a part of the feed is disposed at or near the second focal point in the container.

  The container is preferably a cylindrical container having an opening at the top. When the container is a cylindrical container, it is preferable to use a reflecting plate having a concave reflecting surface having a parabolic surface or a concave reflecting surface having a spheroidal surface as the reflecting plate. More preferably, the concave reflecting plate is arranged so as to cover the opening of the cylindrical container. The concave reflecting plate is preferably connected to the cylindrical container through a hinge or the like so as to be opened and closed.

The bottom surface in the container is preferably an inclined surface.
The said container can have a door for carrying in / out the feed after a process. The door can be provided on the side wall surface of the container. When the bottom surface in the container is an inclined surface, the door is preferably provided on a side wall surface that stands up from the vicinity of the lowermost portion of the bottom surface.

  It is preferable that an exhaust heat hole for exhausting heat in the apparatus is formed in the reflector and the container.

  For example, in the case of using a reflecting plate having a rotating parabolic concave reflecting surface or a reflecting plate having a rotating ellipsoidal concave reflecting surface as the reflecting plate, the top of the reflecting plate has the reflecting A frustoconical depression is formed coaxially or substantially coaxially with the paraboloid or spheroid of the surface, and the depression comprises an opening and a bottom surface having a larger area than the opening. And the region of the bottom surface of the recess portion where the peripheral wall surface of the recess portion is present on the axial direction of the recess portion communicates with the space surrounded by the reflection surface and heat in the space. It is preferable that at least one top exhaust heat hole for exhausting heat is formed. In this embodiment, since the opening of the recess faces the direction opposite to the direction of reflection of the ultraviolet rays by the reflection surface (that is, the back direction of the ultraviolet irradiation device), the heat in the space is exhausted to the outside. be able to. Further, in this embodiment, the top heat exhaust hole is a region where the peripheral wall surface of the hollow portion exists on the axial direction of the hollow portion in the bottom surface of the hollow portion (that is, when viewed from behind the reflector). Therefore, the peripheral wall surface acts as a light shielding member, and heat can be discharged without leaking ultraviolet rays to the outside of the apparatus.

  The form of the heat exhaust hole is not limited to this, and may be, for example, a side wall heat exhaust hole opened in the upper side wall surface of the container. In the said form, it is preferable that the light leakage prevention means for preventing that an ultraviolet-ray leaks from the said side wall exhaust heat hole is provided in the outer side of the side wall surface of the said container. As the light leakage prevention means, specifically, outside the side wall surface, provided around the opening of the side wall heat exhaust hole, the front side, the side when the side wall heat exhaust hole is viewed from the inside of the container, and There is a light shielding member that covers the top.

  It is preferable that the container is provided with a stirring means for stirring the feed. The mycotoxins in the feed can be uniformly removed by stirring.

  As the stirring means, a rotating shaft arranged so as to protrude from the side wall of the container into the container inside the container, and a plurality of stirring blades arranged along the longitudinal direction on the rotating shaft. It is preferable to provide. Further, when the bottom surface in the container is an inclined surface, the lowermost end through which the outline of each of the plurality of stirring blades passes when the rotating shaft rotates and the inclined surface have a constant or substantially constant interval. Thus, it is preferable that the plurality of stirring blades are formed. Furthermore, it is preferable that the door is provided on a side wall surface standing from the vicinity of the lowermost portion of the bottom surface. With such a configuration, the feed is sufficiently stirred and the processed feed can be easily carried out from the door.

  The present invention also relates to a method for removing mycotoxins in a feed contaminated with mycotoxins, comprising the step of irradiating the feed with ultraviolet rays. It is preferable to perform the said process using the apparatus of this invention. Specifically, the feed to be treated is accommodated in the container, and the feed in the container is irradiated with ultraviolet rays by the ultraviolet irradiation device. You may perform the process which stirs the feed in the said container by the said stirring means during ultraviolet irradiation as needed.

  According to the present invention, mycotoxins in feed can be efficiently removed. Since the mycotoxin removal apparatus of the present invention has a relatively simple mechanism, various types can be designed according to the scale of the amount of feed processed.

Hereinafter, preferred embodiments of the apparatus of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of an embodiment of the mycotoxin removal apparatus of the present invention in which the reflecting surface is a paraboloid. The mycotoxin removing apparatus 1 of the present invention includes a cylindrical container 3 for housing the feed 2 and an ultraviolet irradiation apparatus 4 disposed so as to irradiate the cylindrical container 3 with ultraviolet rays.

  The ultraviolet irradiation device 4 includes a concave reflecting plate 6 having a rotating paraboloidal reflecting surface 5 and an ultraviolet light source 7 disposed on the focal point of the paraboloid. Ultraviolet rays from the ultraviolet light source 7 are reflected by the concave reflecting plate 6 and directed in one direction, and reach the feed 2 in the cylindrical container as parallel ultraviolet rays 8. The ultraviolet light source 7 is connected to power supply means. The ultraviolet light source 7 may be a heat generation type as shown in the figure or an LED type.

  The cylindrical container 3 and the ultraviolet irradiation device 4 are connected to each other via a hinge 24 so as to be opened and closed. When the cylindrical container 3 is closed (the state shown in FIG. 1), the ultraviolet ray traveling direction end 6a of the concave reflecting plate 6 and the cylindrical container 3 are connected. The side wall upper end portion 3a comes into contact with each other to prevent ultraviolet rays from leaking to the outside of the mycotoxin removing device 1, and in the opened state, the opening 9 of the cylindrical container 3 is opened to function as a feed inlet for feed. Although not shown, a safety mechanism that prohibits the lighting of the ultraviolet light source 7 when the ultraviolet irradiation device 4 is open may be provided.

  On the top 6 b of the concave reflector 6, a truncated cone-shaped recess 10 is formed coaxially with the paraboloid 5 of the concave reflector 6. FIG. 2 shows an enlarged cross-sectional view near the top 6b. The depression 10 includes an opening 11 and a bottom surface 12 having a larger area than the opening 11. In the bottom surface 12, a region where the peripheral wall surface 13 of the recess 10 exists on the axial direction (vertical direction in FIG. 2) of the recess 10 communicates with the space 14 surrounded by the concave reflector 6. A plurality of top heat exhaust holes 15 for exhausting heat in the space 14 are formed. In FIG. 2, the heat flow is schematically indicated by arrows. In the bottom surface 12, a base 16 of the ultraviolet light source 7 is disposed so as to pass through a region where the opening 11 of the recess 10 exists on the axial direction (vertical direction in FIG. 2) of the recess 10.

  The cylindrical container 3 has a stirring means 17 for stirring the stored feed 2. The stirring means 17 includes a rotating shaft 18 disposed so as to protrude from the side wall of the cylindrical container 3 and a plurality of stirring blades 19 disposed along the longitudinal direction on the rotating shaft 18. The material of the stirring blade 19 is not particularly limited, and can be appropriately selected from materials such as stainless steel and reinforced rubber. The bottom surface 20 in the cylindrical container 3 is an inclined surface, and each agitating blade 19 is arranged such that the lowermost end through which the outline of each agitating blade 19 passes when the rotating shaft 18 rotates and the inclined surface have a constant distance D. Is formed. The rotating shaft 18 is driven by a connected stirring motor unit. However, when automatic operation is not required, the rotating shaft 18 may be rotated manually by removing the unit. A door 21 is provided on a side wall surface (that is, a side wall surface facing the rotation shaft 18) that stands up from the vicinity of the lowermost portion 20 a of the bottom surface (inclined surface) 20. Although not shown, a safety mechanism that prohibits rotation of the rotary shaft 18 in a state in which the door 21 is open can be provided. Although the rotation speed of the rotating shaft 18 is not specifically limited, it can be set to about 1 to 10 times / minute. The stirring means 17 is detachably installed.

  Side wall heat exhaust holes 22 are provided in the upper part of the side wall of the cylindrical container 3. A light shielding member 23 is provided around the opening of the side wall heat exhaust hole 22 outside the side wall to cover the front, side, and upper side when the side wall heat exhaust hole 22 is viewed from the inside of the cylindrical container 3. Yes.

  FIG. 3 is a cross-sectional view of an embodiment of the mycotoxin removal device of the present invention in which the reflecting surface is a spheroidal surface. The mycotoxin removing device 25 of the present invention includes a cylindrical container 3 for containing the feed 2 and an ultraviolet irradiation device 26 arranged so as to irradiate the inside of the cylindrical container 3 with ultraviolet rays. The ultraviolet irradiation device 25 includes a concave reflecting plate 28 having a spheroidal reflecting surface 27, and an ultraviolet light source 7 'disposed at the first focal point F1 of the elliptical surface. The ultraviolet light 8 'from the ultraviolet light source 7' is reflected by the concave reflecting plate 27 and converges toward the second focal point F2. The feed 2 is accommodated in the cylindrical container 3 so that at least a part thereof is located in the vicinity of the second focal point F2, and the feed 2 existing in the vicinity of the second focal point F2 receives strong ultraviolet rays. By stirring the feed 2 stored in the cylindrical container 3 using the stirring means 17, the entire stored feed can be irradiated with strong ultraviolet rays. On the top 28 b of the concave reflecting plate 28, a truncated cone-shaped recess 10 ′ is formed coaxially with the spheroid 27 of the concave reflecting plate 28. The structure of the recess 10 'is the same as the structure of the recess 10 described in detail with reference to FIG. 2 (see FIG. 4). 3, the same reference numerals as those in FIGS. 1 and 2 are the same as those described with reference to FIGS.

FIG. 1 is a cross-sectional view of the mycotoxin removing apparatus of the present invention. FIG. 2 is an enlarged sectional view near the top of the concave reflector. FIG. 3 is a sectional view of the mycotoxin removing apparatus of the present invention. FIG. 4 is an enlarged sectional view near the top of the concave reflecting plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,25: Mycotoxin removal apparatus 2: Feed 3: Cylindrical container 4, 26: Ultraviolet irradiation apparatus 5: Revolving parabolic reflection surface 6, 28: Concave reflector 7, 7 ': Ultraviolet light source 8, 8' : UV ray 9: Opening part 10, 10 ′ of cylindrical container 3: Depression part 11: Opening part 11 ′ of dent part 10: Opening part 12 of dent part 10 ′: Bottom surface 12 ′ of dent part 10: Depression part 10 ′ Bottom surface 13, 13 ′: peripheral wall surface 14: space 14 ′ surrounded by the concave reflector 6: space 15, 15 ′ surrounded by the concave reflector 28: top heat exhaust hole 16: base 16 ′ of the ultraviolet light source 7 : Base 17 of ultraviolet light source 7 ′: stirring means 18: rotating shaft 19: stirring blade 20: bottom surface 21 in the cylindrical container 3: door 22: side wall heat exhaust hole 23: light shielding member 24: hinge 27: spheroidal surface Reflective surface F1: first focus F2: second focus

Claims (12)

  An apparatus for removing mycotoxins in feed contaminated with mycotoxins, comprising: a container for storing the feed; and an ultraviolet irradiation device arranged to irradiate ultraviolet rays inside the container. The mycotoxin removing apparatus characterized by the above. The container has an opening on the upper side,
2. The apparatus according to claim 1, wherein the ultraviolet irradiation device includes an ultraviolet light source that generates ultraviolet light, and a reflector that reflects the ultraviolet light from the light source and directs the reflected ultraviolet light toward the inside of the container. .   The container is a cylindrical container, the reflector has a rotating parabolic reflecting surface, and the light source is disposed at or near the focal point of the rotating paraboloid of the reflecting surface. Item 3. The apparatus according to Item 2.   The apparatus according to claim 3, wherein the reflecting plate is disposed so as to cover an opening of the cylindrical container.   A frustoconical depression is formed coaxially or substantially coaxially with the paraboloid of the reflecting surface at the top of the reflector, and the depression has a larger area than the opening and the opening. And a region of the bottom surface of the recess portion where the peripheral wall surface of the recess portion exists on the axial direction of the recess portion communicates with a space surrounded by the reflection surface. The apparatus according to claim 3, wherein at least one top heat exhaust hole for exhausting heat in the space is formed.   The container is a cylindrical container, the reflecting plate has a spheroidal reflecting surface, and the light source is disposed at or near the first focal point of the spheroidal surface of the reflecting surface. Item 3. The apparatus according to Item 2.   The apparatus according to claim 6, wherein the reflecting plate is disposed so as to cover an opening of the cylindrical container.   A frustoconical recess is formed coaxially or substantially coaxially with the spheroid of the reflecting surface at the top of the reflector, and the recess has an opening and a larger area than the opening. A bottom surface of the recess, and a region where the peripheral wall surface of the recess exists on the axial direction of the recess communicates with a space surrounded by the reflection surface. The apparatus according to claim 6 or 7, wherein at least one top heat exhaust hole for exhausting heat in the space is formed.   The apparatus according to any one of claims 1 to 8, further comprising a stirring means for stirring the feed in the container. The stirring means includes a rotating shaft disposed in the container so as to protrude from the side wall of the container into the container, and a plurality of stirring blades disposed along a longitudinal direction on the rotating shaft. Is,
The bottom surface in the container is an inclined surface,
Each of the plurality of stirring blades is formed such that a lowermost end through which the outline of each of the plurality of stirring blades passes during rotation of the rotating shaft and the inclined surface are at a constant or substantially constant interval. Device according to claim 9, characterized.   A method for removing mycotoxins in a feed contaminated with mycotoxins, comprising the step of irradiating the feed with ultraviolet rays.   The method according to claim 11, wherein the irradiation of the feed with ultraviolet rays is performed using the apparatus according to claim 1.

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