JPS63251053A - Preparation of spongy wheat bran pellet - Google Patents

Abstract

PURPOSE:To prepare spongy wheat bran pellet having excellent permeability and water-retainability, resistant to ready collapse in water, having porous and spongy texture and useful as a culture medium for various fungi, by using a wheat bran having coarse particle size as a raw material. CONSTITUTION:100pts.wt. of wheat bran containing >=50%, preferably about >=80% fraction having particle diameter of >=1mm is added with a large amount of water (>=40pts.wt. of water) and a small amount of a binder such as agar, guar gum and synthetic paste and the mixture is formed. The formed product is spontaneously dried or dried by heating at about >=70 deg.C to obtain pellets having final water-content of about <=15%.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention relates to a method for producing spongy bran pellets used as a medium for culturing various fungi. The present invention relates to a method for producing pellets that float on water, are porous and spongy, have a large surface area, have excellent water permeability and water retention, and do not easily lose their shape in water.

<Prior Art> Conventionally, bran pellets of this type have been formed extremely hard for the purpose of rational storage and transportation.

For this reason, it has a high specific gravity and is dense, causing problems such as sinking immediately when placed in water and immediately losing its shape when placed in water.

<Problems to be solved by the invention> As mentioned above, in order to utilize bran's characteristics of 4ii fiber quality and water retention as a culture medium for fungi, it is difficult to use bran in its powder form due to its poor air permeability. The pellets produced using conventional methods are too hard, have poor permeability, and lose their shape when exposed to water. In addition, a swelling method is used to produce porous materials with a specific gravity that allows them to float on water, but this requires the addition of a large amount of starch (more than 30%), which affects the characteristics of the bran. However, it could not be used in applications requiring low starch content.

<Means for Solving the Problems> The present invention produces bran pellets that have properties completely different from the conventionally produced pellets as described above, that is, they are porous and spongy, have excellent permeability, and water retention. The purpose of this product is to produce bran pellets that do not easily lose their shape even in water, and are mixed by adding a large amount of water (40 parts by weight or more) and a small amount of a binder to 100 parts of wheat bran. This method has been completed to industrially mass-produce the desired bran pellets by molding, molding, and drying.

<Example> The present invention will be described in detail below.

The feature of the present invention is that the bran 1 has a grain size of 50% or more.
00 parts by weight, a large amount of water (40 parts by weight or more) and a small amount of a binder are added, mixed, molded, and then dried, resulting in a spongy, water-retaining property that can be easily submerged in water. It is possible to obtain bran berets that do not lose their shape.

Drying in the method of the present invention may be carried out naturally by leaving it at room temperature, but it is preferable to heat it to 70°C or higher, and it is even more preferable to dry it until the final moisture content of the pellet is 15% or less, preferably 10% or less. preferable.

Also, the particle size of the bran used varies depending on the size of the pellet, but the rougher the particle size structure, the better, and the particle size of 1M or more is 50
% or more, preferably 80% or more.

The molding machine used for molding may be an extrusion molding machine, for example, but any machine that can mold such highly hydrated bran may be used, and germs and other nutrients may be added to add value. can.

Each side of the manufacturing method of the present invention will be explained below.

Example 1 Bran with a particle size distribution of 1.6 or more in 90% or more 100
Add 1.5 parts by weight of agar to 80 parts by weight of water, heat and melt to form a paste, and extrude the mixture using a pellet machine to form a 7Hφ x 15 dark pellet. This was dried in a drying room at 80° C. for 2 hours to obtain spongy bran pellets.

Example 2 90% or more is 1.6. Bran with a particle size distribution of 10
For 0 parts by weight, add 100 parts by weight to 2 parts by weight of dried tengusa, heat and dissolve for 20 minutes while stirring to form a paste, mix for 2 minutes with a mixer, and extrude with a pellet machine. Dry and spongy bran pellets were prepared in the same manner as in Example 1.

Example 3 Add 2 parts by weight of guar gum to 100 parts by weight of bran having a particle size distribution of 90% or more of 1.6 mm, add 80 parts by weight of 95°C water after 3 minutes while continuing to mix with a mixer, and add 3 parts by weight of water at 95°C. The mixture was mixed for a minute, extruded using a pellet machine, and dried in the same manner as in Example 1 to produce a spongy bran pellet.

Example 4 Bran 100I with particle size distribution of 1.6 or more over 90%
To part ffi, 80 parts of water and 5 parts by weight of polyvinyl alcohol were added, heated for 309 minutes to form a paste, molded and dried in the same manner as in Example 1, and formed into a spongy shape. I got a bran beret.

When the spongy bran pellet thus obtained was placed in water, it floated on the water and absorbed water to the center within 5 to 10 minutes, and was then steam sterilized at 120° C. for 1 hour, but maintained its original shape.

<Effects> As described above, the method for producing pellets according to the present invention is low in cost, and when used as a culture medium, the pellets are porous and spongy and have sufficient air permeability and light-trapping properties by ensuring voids. Moreover, the moisture retention of the bran improves water retention, and its nutritional content provides pellets that are ideal for culturing fungi.

Claims (3)

[Claims] (1) A large amount of water (40 parts by weight or more) and a small amount of a binder are added to 100 parts by weight of bran having a particle size of 1 mm or more and 50% or more, mixed, molded, and then dried. Method for producing spongy bran pellets. (2) A small amount of binder may be one or more selected from grains, starch (including modified starch), agar, agar, natural gums (e.g. guar gum), synthetic thickeners (e.g. polyvinyl alcohol), etc. A method for producing spongy bran pellets according to claim 1, which comprises two or more kinds of spongy bran pellets. (3) No matter which binder is used, at least 40 parts by weight (preferably 60 to 100 parts by weight) of water per 100 parts by weight of bran.
The spongy shape according to claims 1 and 2, wherein a large amount of moisture (parts by weight) is added, and the moisture content when mixed with bran and molded is 35% or more (preferably 43 to 55%). Method for producing bran pellets.