JPH07213588A - Chitosan preservation - Google Patents

Abstract

PURPOSE:To keep stable quality of chitosan for a long time, by sealing chitosan in a container made of a packaging material with moistureproofness and gas- barrier performance. CONSTITUTION:Chitosan is preserved in a container made of a packaging material with moistureproofness and gas-barrier performance. The moisture permeability of the packaging material is to be 0-3.0g/m<2>.24h.atm and the oxygen permeability is to be 0-140-cc/m<2>.24h.atm. The packaging material is to be an aluminum based film and the chitosan is to be a product passed 32-400mesh. When a container with a cap is used, the cap part is to be tightly closed with a tape, and when a package with a film such as an aluminum vapor deposition film, an inner bag made of polyethylene, etc., preferably with an outer bag of an aluminum vapor deposition film. It is preferable to use in combination with a deoxidizer or desiccant in the chitosan preserver, or to replace the gas in the container with nitrogen gas. Thus, even if the chitosan is kept under a high temperature and high humidity condition, quality degradation such as viscosity rise is prevented and stable quality is kept for a long time.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention stores chitosan in a container using a packaging material having moisture resistance and gas barrier properties, thereby suppressing an increase in viscosity of chitosan during long-term storage under high temperature and high humidity. Relates to a method for preserving chitosan.

[0002]

2. Description of the Related Art Chitosan is expected to have the effect of so-called dietary fiber due to its indigestibility, and it absorbs bile acids in the digestive system and inhibits reabsorption of bile acids due to many amino groups present in the molecule. Since it has an excellent serum cholesterol lowering effect, it is expected to be applied as a functional food utilizing the cholesterol lowering effect.

[0003]

Chitosan is usually enclosed in a bag of a packaging material such as polypropylene, polyester, polyethylene, etc. and then stored in a kraft bag or a cardboard box for storage. Presents a rise,
Cause quality changes. Therefore, it was necessary to develop a preservation method that maintains stable quality for a long period of time.

[0004]

[Means for Solving the Problems] As a result of various investigations, the inventors have found that storage of chitosan in a container using a packaging material having a moisture-proof gas barrier property in storage at high temperature and high humidity increases the viscosity. It has been found that can suppress.

The present invention has been completed based on the above findings. That is, the present invention relates to a method for preserving chitosan, which comprises enclosing chitosan in a container using a packaging material having moisture resistance and gas barrier properties.

The chitosan used is crab, shrimp carapace,
Examples thereof include those obtained from the cell walls of insect shells, mushrooms, filamentous fungi, etc., and those obtained from the crust of shrimp and shrimp are preferable. The form of chitosan is not particularly limited, but a finely pulverized product that passes through a sieve of 32 to 400 mesh, preferably 60 mesh or more is preferable.

The storage container of the present invention is excellent in moisture resistance and gas barrier property, and if the sealing degree is high, the material for the packaging material of the container and the form of the container are not limited. Examples of the packaging material used include plastic, glass, metal (tin, steel, aluminum, etc.), packaging material using metal, and the like.

Examples of the packaging material using metal include a metal foil such as an aluminum foil and a gold foil covered with a plastic film layer, a metal film adhered to the surface of the plastic film, or a metal powder mixed in a film. Or, it may be impregnated, but specifically, it is a metal-coated film in which a metal such as aluminum is coated on the surface of a plastic film by a method such as vacuum deposition, or a plastic film coated with an ink containing metal powder. To be Examples of the plastic film include polyester, polyethylene, biaxially oriented polypropylene, non-oriented polypropylene, biaxially oriented nylon, cellophane, and the like. Considering all aspects of stability, durability, productivity and price, an aluminum film, that is, an aluminum vapor deposition film or an aluminum foil film is preferable.

The moisture permeability of the packaging material of the container used in the present invention is
The range is preferably 0 to 3.0 g / m ² · 24 h, more preferably 0 to 1.5 g / m ² · 24 h. The oxygen permeability is preferably 0 to 140 cc / m ² · 24 h ·
atm, more preferably 0 to 1.5 cc / m ² · 24 h
-The range is atm.

In the present invention, the water vapor transmission rate and the oxygen transmission rate are JIS Z 0208 and JIS K 712, respectively.
The value measured by the method specified in 6.

In the case of a container with a cap, the cap portion is tightly sealed with tape, and in the case of a package using a film such as an aluminum vapor deposition film, an inner bag such as a polyethylene packaging material is used, and an outer bag is an aluminum vapor deposition package. It is preferable to use wood. Further, an oxygen scavenger and a desiccant may be used in combination inside the chitosan storage container, and the gas inside the container may be replaced with nitrogen.

As conditions for the preservation method of the present invention, the temperature outside the container is preferably 0 to 70 ° C. and the relative humidity is about 10 to 100%, and particularly long-term storage is performed at a temperature of 50 ° C. or more and a relative humidity of 50% or more. It is also possible to do so.

[0013]

The present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.

Example 1 10 g of 80 mesh pass product of chitosan was applied to an aluminum vapor deposition film (manufactured by Kanae Co., Ltd .; composition: polyester 12 μm).
・ Aluminum deposition 400Å / Polypropylene 40 μm)
Enclosed in a 10 × 10 cm bag, 40 ° C, relative humidity 75
%, About 12 hours / day, the sample was stored for 3 months in an incubator with a glass window under irradiation with a fluorescent lamp. After storage, no substantial increase in viscosity was observed. The moisture vapor permeability of the present aluminum vapor deposition film packaging material was 0.8 g / m ² · 24 h, and the oxygen permeability was 0.8 to 1.0 cc / m ² · 24 h · atm.

Example 2 10 g of 80 mesh pass product chitosan was sealed in a brown bottle (200 ml container, manufactured by Iwaki Glass) equipped with a screw cap and stored for 3 months under the same conditions as in Example 1. After saving,
No substantial increase in viscosity was observed.

Example 3 As a test section, an aluminum foil film (manufactured by Hosokawa Yoko Co., Ltd .; composition: polyester 12 μm / polyethylene 15 μm)
/ Aluminum foil 9 μm / Polyethylene 30 μm) 10 ×
10 g of 80 mesh pass product chitosan in a 10 cm bag
The sample was encapsulated, stored for 3 months under the same conditions as in Example 1, and the viscosity was measured after storage. The moisture permeability of this aluminum foil film is 0
It is 0.5 g / m ² · 24 h, and the oxygen permeability is 0 to 0.
It was 5 cc / m ² · 24 h · atm. To measure the viscosity, take 1.5 g of chitosan and add 0.5% acetic acid solution 300
ml was added, and the mixture was stirred and dissolved for 2 hours, and then a rotary viscometer (Digital Vismetron VDA; manufactured by Shibaura System Co., Ltd.) at 20 ° C., rotor No. It measured for 5 minutes on condition of 2,30 rpm.

As a control, 10 g of 80-mesh-passed chitosan was placed in a beaker, opened, and similarly stored, and then the viscosity was measured. In addition, as a conventional section, 10 g of 80 mesh pass product chitosan was enclosed in a polyethylene (100 μm) 10 × 10 cm bag, which was stored in the same manner, and then the viscosity was measured. The results are shown in Table 1.

[0018]

[Table 1] ──────────────────────────────────── Initial value 1st month 2nd month 3 months Eye ──────────────────────────────────── Control group 122cps 105cps 195cps 446cps Conventional group 122cps 101cps 118cps 252cps Test Ward 122cps 111cps 104cps 105cps

[0019]

EFFECTS OF THE INVENTION As is clear from the above results, by storing chitosan in a container using a packaging material having excellent moisture-proof property and gas barrier property, it is possible to obtain a viscosity even when stored under high temperature and high humidity conditions. Prevents quality changes such as rises and stabilizes the quality for a long time.

Claims (4)

[Claims] 1. A method for preserving chitosan, which comprises encapsulating chitosan in a container using a packaging material having moisture resistance and gas barrier properties. 2. The moisture permeability of the packaging material is 0 to 3.0 g / m ² · 24.
h and oxygen permeability of 0 to 140 cc / m ² · 2
The method for preserving chitosan according to claim 1, wherein the storage time is 4 h · atm. 3. The method for preserving chitosan according to claim 1, wherein the packaging material is an aluminum film. 4. The method for preserving chitosan according to claim 1, wherein the chitosan is a 32-400 mesh pass product.