JPH06238163A - Dehydrating sheet - Google Patents

Abstract

PURPOSE:To obtain a safe dehydrating sheet excellent in dehydrating property, small in decrease in viscosity after water absorption and excellent in shape retention, and capable of repeating usage by covering the material having high osmotic pressure and an inorg. additive with a water permeable membrane. CONSTITUTION:The material having high osmotic pressure (e.g. thick malt syrup) and an inorg. additive 2 (e.g. clay) is covered with a water permeable membrane 1 (e.g. common cellophane paper). In such a way, the safe dehydrating sheet excellent in dehydrating property, small in decrease in viscosity after water absorption and excellent in shape retention, and capable of repeating usage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dehydrating sheet.
More specifically, the present invention relates to a dehydration sheet suitable for contact dehydration of food, which is applied to a wide range of fields such as drying of fish, meat and vegetables, pre-treatment of freezing, food preservation, food processing and cooking. be able to.

[0002]

2. Description of the Related Art A large number of contact dehydration sheets that combine a semipermeable membrane and a high osmotic pressure substance and utilize the difference in osmotic pressure have been proposed. For example, Japanese Patent Publication No. 58-58124,
There are JP-A-57-167734 and JP-B-12-22816. The conventional dewatering sheets each contain a polymeric water-absorbing agent having a high water-absorbing capacity therein, and have a long-time water-absorbing performance and a high water-absorbing capacity. However, the polymer water-absorbing agent used in the conventional dehydrating sheet has a problem that its water-absorbing ability is significantly reduced when absorbing water containing ions such as Ca, Mg, Na and Cl. In addition, there is a problem that it cannot be said to be completely safe when there is a risk of contact with food. On the other hand, in consideration of safety, Japanese Patent Publication No. 4-33491 proposes a dehydration sheet containing no polymeric water-absorbing agent. This dehydrated sheet contains a high osmotic pressure substance and a water-soluble paste as a thickening agent therein, but the shape of the dehydrated sheet changes greatly due to a large decrease in viscosity after water absorption, and it can be used only once. There was a flaw. That is, the dehydration sheet having a semi-permeable membrane sandwiched with a high osmotic substance changes its hardness and flexibility depending on the water content of the high osmotic substance. There is a problem in actual use that the hardness and the flexibility of the sheet change greatly due to the movement of water from food and the change of water content.
If it is in the form of a hard plate before use, the adhesion to food will be insufficient and its performance will not be fully exhibited. Further, if the sheet that has absorbed water is soft and does not have a shape-retaining property, it is difficult to remove the sheet, and the sheet may be damaged or the food may be contaminated.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a dehydrated sheet which has a small decrease in viscosity even after dehydration (water absorption), can be repeatedly used, and is safe.

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors found a dehydrated sheet comprising a high osmotic pressure substance and an inorganic additive coated with a water-permeable semipermeable membrane, The present invention has been completed.

The high osmotic pressure substance used in the dehydration sheet of the present invention refers to a substance having an osmotic pressure capable of removing (dehydrating) water from animals and plants. In order to remove water from food, an osmotic pressure of 10 atm or more is actually required, and examples of such a high osmotic pressure substance include starch syrup, sucrose, isomerized sugar, pullulan, glucose, fructose, mannitol, sorbitol and marghetol. There are compounds such as an aqueous solution of edible sugars, glycerin, and propylene glycol.
In particular, an aqueous solution of an edible sugar having a molecular weight of several tens to several hundreds is preferable for the use of the present invention. These are used alone or as a mixture of several kinds.

Examples of the inorganic additives used in the dehydrated sheet of the present invention include clay, talc, silica powder, and laponite (trade name of Laport Industries Co., Ltd.). Among them, montmorillonite (bentonite) belonging to smectite of clay is mentioned. , Hectorite and laponite are particularly preferred.

The mixing ratio of the high osmotic pressure substance and the inorganic additive contained in the dehydration sheet of the present invention can be appropriately changed depending on the kind of the target food and the desired dehydration amount. Inorganic additives are used in an amount of 0.
1 to 5 parts by weight is preferable. When the amount of the inorganic additive is less than 0.1 parts by weight, the thickening effect is poor, and when it is more than 5 parts by weight, the viscosity becomes too high and the workability in encapsulating in the water-permeable semipermeable membrane deteriorates. Sometimes.

As the water-permeable semipermeable membrane used in the present invention,
Water-permeable membranes such as ordinary cellophane paper, low-stretch vinylon film (polyvinyl alcohol), collodion membrane, ethylene-vinyl acetate copolymer film and low-stretch nylon film are suitable. Of these, vinylon film for food packaging is preferable. When an edible saccharide aqueous solution is used as the hyperosmotic substance, the dehydrated sheet of the present invention further comprises, as another component, a hydrophilic alcohol such as a moisturizer,
It is preferable to add glycerin, propylene glycol and the like, which can prevent excessive dehydration during storage and use of the dehydrated sheet, and is effective in maintaining a certain degree of flexibility. It is also effective in hygiene management to add substances having a bacteriostatic action such as ethanol, egg white lysozyme, amino acids and organic acids. Also, as other components, alginic acid, sodium alginate, propylene glycol alginate, annan, starch,
Natural polysaccharides and their derivatives such as sodium starch phosphate, color ginnan, gluten, guar gum, gum arabic, gum arabic, tracant gum, locust bean gum, sodium starch glycolate, sodium fibrin glycolate, casein, natural protein such as casein soda, Synthetic polymers such as sodium polyacrylate, methyl cellulose, sodium carboxymethyl cellulose, polyvinyl alcohol, polyethylene oxide and carboxymethyl cellulose may be added.

FIG. 1 is a schematic view showing an embodiment of a sheet-shaped dehydrating sheet according to the present invention. The surface of the sheet is covered with a water-permeable semipermeable membrane 1 and contains a mixture 2 of a hyperosmotic substance and an inorganic additive therein. It may further contain a moisturizer and a bacteriostat. The semipermeable membrane on the surface is permeable to water, ammonia and amines, but impermeable to amino acids, nucleic acids, sugars and the like, which is convenient for dehydration of foods.
The hardness of the inside of the sheet depends on the conditions of use, but is generally 15,000 to 50,000 mPas. s
Has a good viscosity. 50,000 mPas. If it is harder than s, the adhesion to food is poor, and it is 15,000 mPas. If it is softer than s, movement may occur in the sheet, the thickness may be offset, and dehydration may be uneven. The dehydrated sheet of the present invention is characterized in that its hardness does not change much even if the food is dehydrated several times.

[0010]

The present invention will be described in more detail with reference to the following examples. Example 1 As a high osmotic substance, starch syrup (Maltose manufactured by Sanmatsu Kogyo Co., Ltd., trade name: Himaru-38, concentration 75% by weight)
1.0 part by weight of bentonite, 4.0 parts by weight of propylene glycol as a moisturizer, and 2.0 parts by weight of ethanol as a bacteriostatic agent were added to parts by weight, and an osmotic pressure of 170 atm and a viscosity of 4 were added.
5,000 mPas. A mixture of s (20 ° C., E-type viscometer) was obtained. Then, 50 g of the above mixture was coated with a vinylon film (manufactured by Kuraray Co., Ltd.) to have a length of 50 cm.
And the periphery was heat-sealed so that the width was 30 cm. This sheet had an average thickness of 0.4 mm and was white and highly flexible. Next, body length 30 cm, weight 8
00 g of horse mackerel was opened, wrapped in the above sheet, and allowed to stand in a refrigerator. The horse mackerel was dehydrated well after 6 hours. Next, when the surface of this sheet was wiped and repeated twice using a newly opened horse mackerel in the same manner as above, the degree of dehydration of the fish was good. When the starch syrup mixture was taken out from the sheet and the concentration of starch syrup was measured, the concentration of starch syrup in the original mixed solution was reduced from 70.1% by weight to 64.1% by weight, but the viscosity was 40,000 mPas. It was not so low as s.

Example 2 100 parts by weight of an isomerized sugar solution (concentration 70% by weight aqueous solution),
Bentonite (1.5 parts by weight) and glycerin (4.5 parts by weight) were mixed to give a viscosity of 35,000 mPas. A mixed solution of s was obtained. Using 50 g of this mixed solution, a sheet covered with a vinylon film having a length of 50 cm and a width of 30 cm was prepared in the same manner as in Example 1. This sheet had an average thickness of 0.4 mm and was white and highly flexible. Using this sheet, a horse mackerel with a body length of 25 cm and a weight of 700 g was opened, wrapped in the above sheet and placed in a refrigerator.
The horse mackerel was dehydrated well after the lapse of time. After dehydrating the newly opened horse mackerel using this sheet, the isomerized sugar mixed solution was taken out from the sheet and the sugar concentration was measured. From the isomerized sugar concentration in the original mixed solution of 66.0% by weight, 59.
Although it had decreased to 0% by weight, the viscosity was 30,200 mPas.
s. It was s.

Example 3 To 30 parts by weight of water, 100 parts by weight of sorbitol, 10 parts by weight of propylene glycol and 1.5 parts by weight of Laponite XGL (manufactured by Laport Industries Co., Ltd.) were added to give a viscosity of 4
5,000 mPas. A mixed solution of s was obtained. This mixture 5
Using 0 g, a sheet covered with a vinylon film having a length of 50 cm and a width of 30 cm was prepared in the same manner as in Example 1. This sheet had an average thickness of 0.4 mm and was white and highly flexible. When a horse mackerel weighing 150 g was opened, the sheet was wrapped using this sheet and allowed to stand in a refrigerator, the horse mackerel was satisfactorily dehydrated after 6 hours. After dehydrating freshly opened horse mackerel using this sheet, the sorbitol mixture was taken out from the sheet and the sorbitol concentration was measured. The sorbitol concentration in the original mixture decreased from 63% by weight to 54% by weight. However, the viscosity is 2
8,000 mPas. It was s.

Comparative Example 1 100 parts by weight of starch syrup (concentration: 75% by weight), 1.7 parts by weight of sodium alginate, 4.0 parts by weight of propylene glycol and 2.0 parts of ethanol were mixed to give a viscosity of 48,000 m.
Pas. A mixture of s was obtained. Using 50 g of this mixed solution, a length of 50 cm and a width of 30 were obtained in the same manner as in Example 1.
A sheet covered with a vinylon film having a size of cm was prepared. The sheet had an average thickness of 0.4 mm and was white and flexible. However, when a repeated dehydration test was performed using an open horse mackerel in the same manner as in Example 1, the first time showed good dehydration performance. However, the sheet lost its shape-retaining property, and the starch syrup mixture in the sheet was offset to the edge of the sheet, and it was difficult to use it for the second time. When the starch syrup mixture was taken out from the sheet and the concentration of starch syrup was measured, the concentration of starch syrup in the original mixture was 7
Although it was only reduced from 0.1% by weight to 66% by weight, the viscosity was 13,000 mPas. It had fallen to s.

[0014]

The dewatering sheet of the present invention is excellent in dewatering performance, has a small decrease in viscosity after absorbing water, is excellent in shape retention, and can be repeatedly used, and is safe.
Remarkably useful.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a dehydrating sheet of the present invention.

[Explanation of symbols]

 1 ... Water-permeable semipermeable membrane 2 ... High osmotic pressure substance and inorganic additive. 3 ... Seal part

Claims (1)

[Claims] 1. A dehydrated sheet obtained by coating a high osmotic pressure substance and an inorganic additive with a water-permeable semipermeable membrane.