JP5511319B2 - Dry gel sheet and use thereof - Google Patents

Description

  The present invention relates to a dry gel sheet. More specifically, the present invention is a dry gel sheet adjusted to have a water activity value of 0.6 or less, which is impregnated with an aqueous solution at the time of use and restored to a water-swollen gel sheet for use. The present invention relates to a dry gel sheet.

  Conventionally, in the fields of cosmetics, daily necessities, foodstuffs, medical supplies and the like, a gel-like material processed into a sheet shape has been used. For example, packs containing moisturizing ingredients for cosmetics, refrigeration and cooling agents for daily necessities, jelly sweets for foodstuffs, seasonings that dissolve when heated, and bactericides for medical supplies And sterilizing sheets containing a jelly agent and a bactericidal agent, and the use thereof is diverse.

  Specifically, a skin-penetrating sheet obtained by impregnating a sheet-like base material made of collagen, gelatin, hyaluronic acid or the like with a drug or a cosmetic (Patent Document 1); Konjac sheet used for medical use (Patent Document 2); Pack cosmetic made of water-soluble film made of pullulan, gelatin, chitosan, cellulose derivative, etc. (Patent Document 3); Water-soluble polymer containing physiologically active substance A pack sheet for cosmetics formed by gelation and absorption into a base material, and then dried (Patent Document 4); an external gel-like composition formed of a water-soluble polymer and having a specific compression deformation rate (Patent Document) 5); a preformed monolayer sheet-like member containing at least one useful agent and at least one polymeric gel-forming agent (Patent Document 6); A skin care patch comprising a drogel adhesive substrate, hinokitiol, and a moisturizing component (Patent Document 7); one type of water-soluble polymer selected from the group consisting of medicinal components, carboxyvinyl polymers and polysaccharide polymers Or, a liquid composition for sheet-like cosmetics (Patent Document 8) containing two or more kinds and a specific polyoxyalkylene alkyl ether, carrageenan and / or mannan, and can form a gel having a melting point of 80 ° C. or more alone. Gel composition for external use containing thickening polysaccharide (Patent Document 9); viscosity agent (having higher affinity with water and thickening properties, aqueous solution is transparent or almost transparent, almost colored Uncoated, such as copolymers of acrylamide and crosslinkable monomers, carrageenan, gellan gum, agar, etc.), wetting agent and water, and the appearance is colorless or present A transparent sheet-like pack cosmetic made of a transparent gel-like sheet and having a woven fabric or nonwoven fabric having a large opening ratio inside or on the surface, or laminated in the thickness direction (Patent Document 10); no support layer A sheet-like cosmetic comprising a sheet of water-containing gel and having a light transmittance of 70% or more in a 1 mm thick sheet (Patent Document 11); selected from i) gellan gum, ii) xanthan gum, etc. in the aqueous phase A solid composition comprising a gelling system comprising at least one other hydrocolloid, and iii) at least one amphiphilic polymer comprising at least one fatty chain and at least one hydrophilic unit; At least one hydrocolloid selected from derivatives and xanthan gum, and at least 2 relative to the total weight of the composition A non-filler-containing solid containing a hydrophilic gelling system composition containing a combination of weight percent copper carrageenan in an aqueous phase in an amount of less than 20 weight percent based on the total weight of the composition. Cosmetic composition (Patent Document 13); Solid cosmetic composition containing a composition of a hydrophilic gelling system containing a combination of gellan gum and at least two hydrogel colloids (Patent Document 14); Copolymer with a polymer, carrageenan, etc.), a wetting agent, a physiologically active ingredient, and water, and a gel-like sheet that is colorless and transparent or colored and transparent in appearance (Patent Document 15); A sheet-like pack formed by impregnating or applying a patch composition containing a water-soluble polymer and water (Patent Document 16); extracted from seaweed Sheet for skin application obtained by drying a solution or gel containing the polysaccharides into a sheet (Patent Document 17); Solution or gel containing 0.1 to 10% of polysaccharides extracted from seaweed Sheet for skin application obtained by drying the product into a sheet (Patent Document 18); a sheet-like coolant used for application to an adherend comprising a gel-type cold-retaining composition containing native gellan gum and water (Patent Document 19): A pharmaceutical composition for transdermal administration, which is made into a hydrogel by combining hypochlorous acid water and native gellan gum (Patent Document 20); a composition containing polyacrylic acids, polyvalent metals and water An adhesive cooling composition characterized by having a moisture content of 75 to 95 parts by weight per 100 parts by weight of the composition and containing substantially no bubble component (Patent Document 21); A gelled layer composed of a specific cross-linked polymer and monool having a structural unit having a xyl group and / or a sulfonic acid group as an essential structural unit, and a cooled gel sheet composed of a support (Patent Document 22); An edible film as a component (Patent Document 23): a film in which a polysaccharide that is soluble in warm water and has a gelling ability is laminated with a substance selected from gum arabic, pullulan, starch, and gelatin Conventionally, a shaped product (Patent Document 24) has been proposed.

JP 2005-263759 A JP 2005-133018 A JP-A-2005-97191 JP-A-2005-22980 JP 2004-231516 A Special table 2003-518209 JP 2002-249422 A JP 2002-226355 A JP 2002-87793 A JP 2001-213725 A JP 2000-226325 A JP 2000-53527 A JP-A-11-246353 JP-A-11-246352 JP-A-11-269031 JP-A-11-130664 JP-A-8-40882 Japanese Patent Laid-Open No. 08-40882 JP-A-10-158635 Republished publication WO2007 / 094413 pamphlet Japanese Patent Laid-Open No. 10-258078 JP 2004-41712 A JP 2004-248665 A JP 60-76336 A

  Each of the sheets described in the above-mentioned patent documents is prepared by adding various components (effective ingredients in cosmetics, drugs, foods, etc.) from the manufacturing stage, and is prepared by gelation. The use of the gel sheet is limited from the beginning due to the added components, and it cannot be used for other purposes or applied. Moreover, since it is provided in a water-containing state, it is heavy and inconvenient to carry, and needs to be sealed and packaged so that it does not dry during storage.

  Therefore, an object of the present invention is to provide a dry gel sheet that is impregnated with a desired aqueous solution at the time of use and used as a water-swelling gel sheet according to the purpose of the user. In particular, the present invention is a dry gel sheet composed of highly safe components so that it can be used widely in various fields such as cosmetics, foods and daily necessities depending on the type of aqueous solution to be impregnated. The purpose is to provide.

  More specifically, in the present invention, the dry gel sheet has a low water content and is light and easy to carry, while impregnating an aqueous solution containing a desired component at the time of use, so as to absorb water quickly. It aims at providing the dry gel sheet used as the water swelling gel sheet excellent in adhesiveness and intensity | strength (breaking strength).

  In order to solve the above-mentioned problems, the present inventors have prepared a dry gel sheet by selecting and combining various polysaccharides, water absorption when this is immersed in water, and adhesion and strength of the generated water-swollen gel sheet. As a result of various studies on (breaking strength), a gelled sheet prepared by combining xanthan gum and mannans (generic name for glucomannan and galactomannan) as a gelling agent, and the gelling agent further It has been found that a dried product of a gelled sheet prepared by combining deacylated gellan gum has characteristics suitable for the above purpose. Moreover, it confirmed that the dry gel sheet created from this component can be used universally as a base material which prepares a water swelling gel sheet in various fields, such as the cosmetics field, the food field, and the daily necessities field.

  This invention is completed based on this knowledge, and relates to the dry gel sheet and water swelling gel sheet which have the following aspects.

(I) Dry gel sheet (I-1 ) A dry gel sheet comprising xanthan gum and at least one mannan selected from the group consisting of glucomannan and galactomannan as a gelling agent, A dry gel sheet, wherein an aqueous solution containing xanthan gum and mannans is formed into a sheet and then dried to adjust the water activity value to 0.6 or less.
(I-2) The dry gel sheet according to (I-1), wherein the mixing ratio of xanthan gum and mannans is 1: 9 to 9: 1 (mass ratio).
(I-3) The dry gel sheet according to (I-1) or (I-2), wherein the galactomannan is at least one selected from the group consisting of cassia gum, locust bean gum, and tara gum.
(I-4) The dried gel sheet according to any one of (I-1) to (I-3), which further contains deacylated gellan gum.
(I-5) The dried gel sheet according to (I-4), wherein the content of the deacylated gellan gum is 2 to 50 parts by mass with respect to 100 parts by mass of the total amount of xanthan gum and mannans.
(I-6) The dry gel sheet according to any one of (I-1) to (I-5), which is impregnated with an aqueous solution at the time of use and used as a water-swollen gel sheet.
(I-7) The aqueous solution to be impregnated is at least one selected from the group consisting of a moisturizing component, a cooling component, an analgesic component, an anti-inflammatory component, a nutritional component, and a seasoning component The dry gel sheet according to (I-6), which is an aqueous solution containing seeds.

(II) Water-swelling gel sheet and method for preparing the same (II-1) A method for preparing a water-swelling gel sheet comprising the step of impregnating the dry gel sheet according to any one of (I-1) to (I-5) with an aqueous solution .
(II-2) The aqueous solution to be impregnated is at least one selected from the group consisting of a moisturizing component, a cooling component, an analgesic component, an anti-inflammatory component, a nutritional component, and a seasoning component The method for preparing a water-swelling gel sheet according to (II-1), which is an aqueous solution containing seeds.
(II-3) A water-swelling gel sheet prepared by the method described in (II-1) or (II-2).
(II-4) The water-swollen gel sheet described in (II-3), wherein the water-swollen gel sheet is a cooling sheet, a seasoning sheet, a decorative sheet, or a bacterial test sheet.

  Drying of the present invention prepared by drying the composition given in the present invention, that is, xanthan gum and mannans as gelling agents, or gelled sheets prepared using deacylated gellan gum in addition to these gelling agents The gel sheet (dried gel sheet) in a state is characterized by being light in weight and having a predetermined breaking strength, so that it is easy to handle, and is not bulky so that it requires less storage space. Moreover, by adjusting the water content of the dry gel sheet (preferably the water content is adjusted so that the water activity value is 0.6 or less, more preferably about 0.3 to 0.6), the propagation of miscellaneous bacteria, etc. It can be stored for a long time in a hygienic state. If the water activity value is 0.6 or less, most germs cannot be propagated.

  The dry gel sheet of the present invention is impregnated with an aqueous solution containing a desired component at the time of use, thereby absorbing the aqueous solution in a short time and restoring it to a water-swollen gel sheet. Since the water-swelling gel sheet has good strength (breaking strength), it can be suitably used as a cooling sheet or a cosmetic pack sheet, which will be described later, without using a substrate such as a nonwoven fabric. it can. Moreover, since it has excellent adhesion and extensibility, it can follow the movement of the object to be adhered without peeling off. For this reason, even when used as, for example, a cooling sheet or a cosmetic pack sheet, the problem of being in close contact with the skin and peeling off during use is unlikely to occur.

  By the way, as a method of increasing the strength of the gel sheet, there is a method of increasing the concentration of the gelling agent by increasing the amount of the gelling agent used for preparing the gel. However, when trying to prepare a gel sheet with a high gelling agent concentration, there are many problems such as lumps occurring when the gelling agent is dissolved, and the viscosity increases, making stirring difficult. However, if the gel sheet is once dried to form a dry gel sheet as in the present invention, and then the water-swelled gel sheet is prepared by absorbing water, the original gel sheet ( A gel sheet that is stronger (higher in breaking strength) than a gel sheet before drying can be easily prepared.

  That is, the dry gel sheet of the present invention is useful as a base material for preparing a strong water-swelling gel sheet having a high breaking strength by impregnating with a desired aqueous solvent. Moreover, the dry gel sheet of the present invention is useful as a versatile base material for preparing a water-swelling gel sheet in all fields such as food, cosmetics, agriculture and daily necessities, depending on the type of aqueous solvent to be impregnated. In other words, according to the dry gel sheet of the present invention, since there is no restriction on the aqueous solvent to be impregnated, it is impregnated with an aqueous solution containing various components in the fields of food, cosmetics, pharmaceuticals, agriculture and daily necessities according to the purpose and preference of the user. Thus, a desired water-swelling gel sheet can be produced in all fields such as foods, cosmetics, pharmaceuticals, agriculture and daily necessities.

(I) Dry gel sheet The dry gel sheet of the present invention contains xanthan gum and mannans as gelling agents, and after the aqueous solution containing xanthan gum and mannans (gel sheet preparation liquid) is formed into a sheet shape, it is dried. The water activity value is adjusted to 0.6 or less.

  In the present invention, the “dry gel sheet” is prepared by adding a gelling agent to water and dissolving it by heating, and then drying the thinly spread sheet and having a water activity value of 0.6 or less. A sheet. Here, the “water activity value” of the dried gel sheet can be measured using a water activity meter (water activity meter WA-360 manufactured by Shibaura Electronics Co., Ltd.).

  From the viewpoint of suppressing the propagation of various bacteria, it is particularly preferable to adjust the water activity value of the dried gel sheet to 0.55 or less.

The xanthan gum used in the present invention is a fermented polysaccharide produced by the microorganism Xanthomonas campestris. The side chain consisting of D-mannose, D-glucuronic acid, and D-mannose is added to the main chain skeleton of β-1,4-D-glucan. An anionic polysaccharide with a chain attached. The C6 position of D-mannose bound to the main chain is acetylated, and the terminal D-mannose is bound with pyruvate and acetal.

  Examples of mannans used in the present invention include glucomannan and cassia gum, locust bean gum, tara gum, guar gum, fenugreek gum and the like classified into galactomannan. Preferably, glucomannan and galactomannan include locust bean gum and tara gum. These can be used individually by 1 type or in combination of 2 or more types.

  Locust bean gum is commonly used in the field of food and is obtained from the endosperm of the seeds of carob trees, which are perennial evergreen trees of legumes. In the structure, galactose is bonded to the main chain of mannose, and the ratio of galactose to mannose is about 1: 4. Widely used in foods and feeds for thickeners and stabilizers.

  Tara gum is a polysaccharide obtained from the seeds of the perennial legume cod (Caesalpina spinosa). In the structure, galactose is bonded to the main chain of mannose, and the ratio of galactose to mannose is about 1: 3. Widely used in foods for the purpose of thickeners and stabilizers.

  Glucomannan is a storable polysaccharide contained in konjac potato, which is a β-1,4-linked galactose and mannose in a ratio of about 2: 3. It is acetylated at a rate of 1 in 19 and has a branch at a rate of 1 in 50-60 sugars. In the food field, in addition to gelling agents, it is used for the purpose of improving texture and water retention.

  The amount of these used may be an amount that can be molded into a sheet-like gel (gelled sheet) when the xanthan gum and mannan are dissolved in water by heating. Preferably, when a dry gel sheet prepared by drying the gelled sheet is impregnated with an aqueous solvent again, the water-swollen gel sheet can be restored, and it does not collapse for the hand, and has good breaking strength, extensibility, adhesion The amount is such that it can be prepared with the property. For example, the total amount of xanthan gum and mannan contained in 100% by weight of the gelling agent-containing aqueous solution (gel sheet preparation solution) described above can be 0.1 to 3% by weight. Preferably it is 0.5-3 mass%, More preferably, it is 1-2 mass%.

  In addition, although it does not restrict | limit as a compounding ratio of a xanthan gum and mannan, Preferably, 1: 9-9: 1 can be mentioned by mass ratio. Preferably it is 8: 2 to 2: 8, More preferably, it is 7: 3 to 3: 7.

  Thus, by using together xanthan gum and mannans as a gelling agent, a dry gel sheet having desired strength and excellent water absorption and restoration properties can be prepared as shown in Experimental Example 1 described later. Moreover, the water swelling gel sheet prepared by impregnating this with water has the characteristics that it is excellent in strength (breaking strength), extensibility, and adhesion.

Here, although not limited, it is preferable that the dry gel sheet has a breaking strength of at least 35 N / cm ² . More preferably at least 55N / cm ^2, particularly preferably dry gel sheet having at least 75N / cm ² breaking strength. Here, the numerical value of the breaking strength is an index of the difficulty of damaging the dried gel sheet, and the higher the value, the harder it is to break.

  Moreover, as a restoration rate (mass%) after 1 hour of water absorption of the dried gel sheet at room temperature, it is 50 mass% or more, preferably 50 to 400 mass%. More preferred is 100 to 300% by mass, and particularly preferred is 100 to 200% by mass. In addition, this restoration rate can be calculated | required by a following formula using ion-exchange water as water to absorb.

  Furthermore, the dry gel sheet of the present invention can use deacylated gellan gum as a gelling agent in addition to the above xanthan gum and mannans.

Here, deacylated gellan gum is a fermented polysaccharide produced by Sphingomonas elodea outside the cells, 1-3 linked glucose, 1-4 linked glucuronic acid, 1-4 linked glucose, and 1-4 linked glucose. It is a straight-chain polymeric polysaccharide having 4 units of rhamnose as a structural unit, and has 1 carboxyl group residue per 1 structural unit. Native gellan gum is a gellan gum that is separated from deacylated gellan gum by an average of 1/2 residue of glyceryl group and acetyl group per 1 unit of the united glucose. is there.

  Deacylated gellan gum is commercially available, and examples of such products include Gelup (trademark) KS manufactured by San-Ei Gen FFI and Kelco Gel manufactured by CP Kelco. .

  The ratio of deacylated gellan gum to xanthan gum and mannans is not particularly limited as long as the effect of the present invention is achieved, but usually 2 to 50 parts by mass with respect to 100 parts by mass of xanthan gum and mannans. Can be mentioned. Preferably 3-40 mass parts, More preferably, 5-20 mass parts can be mentioned.

  Thus, by using deacylated gellan gum in addition to xanthan gum and mannans as a gelling agent, as shown in Experimental Example 1 (Examples 2 to 5) described later, desired strength and excellent water absorption A dry gel sheet having a restoring property can be prepared. Moreover, the water swelling gel sheet prepared by impregnating this with water has the characteristics that it is excellent in strength (breaking strength), extensibility, and adhesion.

  Moreover, the dry gel sheet | seat of this invention can also mix | blend a plasticizer as components other than the said gelatinizer for the objective of providing a softness | flexibility to a sheet | seat. Examples of the plasticizer include, but are not limited to, polyhydric alcohols such as glycerin, propylene glycol, and polyethylene glycol; sugars such as glucose, fructose, maltose, sorbitol, and oligosaccharide; fatty acids such as glycerin fatty acid ester and sucrose fatty acid ester. Mention may be made of ester derivatives.

  The blending ratio of the plasticizer is not particularly limited as long as it is within a range that does not hinder the effects of the present invention, but it can be generally about 10 to 85% by mass in 100% by mass of the solid content of the dry gel sheet. . Preferably it is 15-80 mass%, More preferably, it is 20-75 mass%.

  Furthermore, the dry gel sheet of the present invention may contain other additives as desired in addition to the gelling agent as long as the effects of the present invention are not hindered. Such additives can be selected according to the intended use of the dry gel sheet, that is, the intended use of the water-swollen gel sheet prepared by impregnating the dry gel sheet with an aqueous solution. For example, known cosmetic additives and food additives In addition, oil-soluble and water-soluble can be added. Examples of such additives include polymeric polysaccharides (eg, gum arabic, alginate, tamarind seed gum, soluble starch, dextrin, cyclodextrin, pectin, water-soluble hemicellulose, etc.), protein degradation products (eg, casein) , Gelatin, etc.), vitamins, pigments (eg, α-carotene, β-carotene, lycopene, anthocyanin pigments), flavors, sweeteners, salts, unsaturated fatty acids (eg, α-linolenic acid, γ-linolenic acid, Linoleic acid, DHA, etc.). The amount of these additives used is appropriately determined according to the purpose of use. In addition, antiseptics (for example, butylhydroxytoluene, sodium benzoate, parabens (paraoxybenzoic acid esters), chlorhexidine gluconate, etc.) and antibacterial agents for antiseptic and antibacterial purposes, and antioxidants for the purpose of preventing oxidation (For example, tocopherol and its derivatives) can also be blended. However, since the dry gel sheet of the present invention has a low water activity value of 0.6 or less, the risk due to antiseptic and increase in bacteria during storage is suppressed. For this reason, for the purpose of antiseptic and antibacterial purposes, it is possible to suppress the addition amount of ordinarily used preservatives and antibacterial agents or to add no additives.

  As a method for preparing a dry gel sheet in the present invention, first, tap water, distilled water, natural water, ion-exchanged water, fresh water and the like in a desired amount of gelling agent (xanthan gum and mannans, or xanthan gum, mannans and deacylated type) Gellan gum) is added and dissolved by heating to about 90 ° C. to prepare a gelling agent-containing aqueous solution (gel sheet preparation solution), which is then formed into a sheet by a known method. For forming into a sheet, for example, a gelling agent-containing aqueous solution is poured into a vat (tray) so as to have a desired thickness, and the gelling is performed by cooling the gelling agent-containing aqueous solution into a block shape. Later, the method etc. which cut this thinly into a sheet form can be illustrated. Next, the sheet is dried.

  The drying process can be carried out by using an existing drying apparatus such as a hot air dryer or a plate warmer, sun drying or shade drying, and finally the water activity value of the dried gel sheet is 0.6 or less, preferably It may be carried out until it becomes 0.55 or less, more preferably 0.5 or less. If the drying is insufficient, the propagation of various germs becomes a problem, causing problems in terms of hygiene and stickiness, resulting in poor handling. On the other hand, if it is excessively dried, the dried gel sheet is liable to break, so that it becomes unsuitable for storage and handling.

  Thus, the dried gel sheet of the present invention can be obtained.

  By impregnating such a dry gel sheet with an aqueous solution containing various components, water can be rapidly absorbed and swollen to prepare a water-swollen gel sheet excellent in adhesion, extensibility, strength and transparency. it can. Such a water-swelling gel sheet can be widely used in the fields of food, cosmetics, medical and daily necessities depending on the type of aqueous solution to be impregnated.

(II) Water-swelling gel sheet The water-swelling gel sheet of the present invention is prepared by using the above-mentioned dry gel sheet of the present invention as a base material, impregnating it with an aqueous solution, and swelling with water. According to the dry gel sheet of the present invention described above, an aqueous solution can be rapidly absorbed, and a water-swollen gel sheet having desired strength, extensibility and adhesion can be restored.

  In order to prepare a water-swelling gel sheet excellent in strength and extensibility, it is necessary to increase the gelling agent concentration by increasing the amount of gelling agent used for gel preparation. However, since a gelling agent develops a high viscosity when dissolved, simply increasing its concentration is limited due to operational problems. Therefore, after the gel sheet is dried once as in the present invention to obtain a dry gel sheet, by adjusting the amount of water to be absorbed by adjusting the amount of water to be absorbed by preparing water-swollen gel sheet, the gel sheet is dried more than the gel sheet before drying. A strong (high breaking strength) water-swollen gel sheet can be prepared. That is, a water-swollen gel sheet having desired breaking strength and extensibility can be prepared by appropriately adjusting the amount of the aqueous solution impregnated in the dry gel sheet.

  Moreover, the water swelling gel sheet | seat of various uses can be prepared by selecting suitably the aqueous solution which a dry gel sheet is made to impregnate.

  As specific applications, for example, in the cosmetic field, the components to be blended in the “aqueous solution” include polyhydric alcohols such as glycerin, propylene glycol, and dipropylene glycol; lower alcohols such as ethanol and propanol; xylitol, mannitol. Sugar alcohols such as sorbitol; UV absorbers such as paraaminobenzoic acids and benzophenone derivatives; moisturizing ingredients such as polyethylene glycol and hyaluronic acid; whitening ingredients such as vitamin C and its derivatives and kojic acid; urea, lactic acid, citric acid and the like As long as it can be used for cosmetics, such as the exfoliating component, it can be used without limitation.

  More specifically, when a dry gel sheet is impregnated with an aqueous solution containing a moisturizing component as an “aqueous solution”, the resulting “moisturizing component-containing water-swollen gel sheet” can be used as a moisturizing face pack. Become. In addition, when a dry gel sheet is impregnated with an aqueous solution containing a whitening component or a wrinkle removing component (anti-aging component) instead of a moisturizing component, the obtained “whitening component-containing water swollen gel sheet” or “wrinkle removing component-containing water swollen” is obtained. The gel sheet can be used as a face pack for whitening or tanning treatment, or a face pack for wrinkle removal (anti-agent).

  In addition, in the field of daily goods, when water is impregnated into a dry gel sheet, the resulting “water-swelling gel sheet” can be used as a cold compress or a cold gel sheet to be applied when heat is generated. Furthermore, it is also possible to impregnate a dry gel sheet with an aqueous solution containing a component having a cooling / cooling effect such as menthol.

  Furthermore, a germination sheet of a plant impregnated with a nutrient component such as potassium nitrate, ammonium nitrate, or potassium dihydrogen phosphate; a fragrance / deodorant added with an fragrance component such as lavender or chamomile can also be used.

  In addition, the xanthan gum, mannans and deacylated gellan gum used in the present invention are all used as food additives. If the xanthan gum, mannans and deacylated gellan gum as food additives are used, an edible gel sheet is used. Can also be used. For example, a fruit juice jelly can be impregnated with a fruit juice, or a gel-like seasoning can be obtained by impregnating an aqueous solution containing a sweetener such as sugar, and a seasoning such as salt, soy sauce or soup.

  Thus, the dry gel sheet according to the present invention can be stored for a long period of time in a dry and hygienic state when not in use, and when used, the dry gel sheet becomes an aqueous solution containing components according to the purpose of use. A desired water-swelling gel sheet can be prepared only by impregnating an appropriate amount.

  By appropriately changing the components added to the aqueous solution to be included in the dry gel sheet, it is possible to expand its applications without limit.

  Hereinafter, the content of the present invention will be specifically described using the following experimental examples, examples, comparative examples, and the like, but the present invention is not limited to these. In the formulation, unless otherwise specified, “%” means “mass%” and “part” means “part by mass”.

Experimental examples (Examples 1 to 5, Comparative Examples 1 to 14)
A dry gel sheet was prepared according to the blending ratio in Table 1.

<Method for preparing dry gel sheet>
While stirring 90 ° C. ion-exchanged water, the gelling agent was added little by little and dissolved by stirring at 90 ° C. for 10 minutes. For Examples 2 to 5 and Comparative Examples 1 to 4, 9 and 10, calcium lactate pentahydrate dissolved in a small amount of ion-exchanged water at 90 ° C. was added and stirred and mixed. Potassium chloride dissolved in a small amount of ion-exchanged water at 90 ° C. was added and stirred and mixed, and then propylene glycol was added little by little and further stirred and mixed. In other examples and comparative examples, propylene glycol was added little by little to the aqueous solution of the gelling agent prepared above and further stirred and mixed.

  To compensate for the evaporating water, the whole amount is corrected with ion exchange water at 90 ° C., the solution is poured into a stainless steel tray (36 cm × 28 cm) until the liquid thickness becomes 0.4 cm, and left at room temperature for 1 hour. Gelled (gelled sheet). However, in Comparative Example 11, gelation occurs at 70 to 80 ° C., and gelation occurs while the solution is poured, or gelation occurs immediately after casting, and the thickness of the sheet becomes nonuniform. Was kept at 90 ° C., and the solution was poured into a tray that had been heated to 80 ° C. or higher in advance while maintaining the liquid temperature of 80 ° C. or higher.

  Next, the gelled sheet was dried at 60 ° C. until the loss on drying (105 ° C., 10 minutes) was about 20%, to obtain a dried gel sheet (dried gel sheet).

<Evaluation of dry gel sheet>
About the dry gel sheet (Examples 1-5, comparative examples 1-14) prepared by the said method, the item shown to following 1) -4) was evaluated. These results are shown in Table 2.

Evaluation 1) Breaking strength of dry gel sheet (N / cm ² )
Evaluation method: A penetration test was performed using a texture analyzer (Texture analyzer, TA-XT2i, manufactured by Stable Micro Systems) while the dried gel sheet was in a dry state, and the breaking strength (hardness to tear) of the sheet was measured. Specifically, a dry gel sheet (50 mm × 50 mm) is placed on a perforated platform having a diameter of 10 mm, and a cylindrical plunger having a diameter of 6 mm made of stainless steel is pushed vertically, and the strength when the dry gel sheet breaks (breaking strength: N / Cm ² ).

Evaluation 2) Water absorption (restoration rate)
Evaluation method: The weight when the dried gel sheet was impregnated with ion-exchanged water for 60 minutes at room temperature was measured.
Relative ratio (% by weight) was calculated based on the weight of the gelled sheet before drying measured in advance (100% by weight). 100% or more was evaluated as ○, 50 to 100% as Δ, and less than 50% ×.

Evaluation 3) Breaking strength (N / cm ² ) and breaking distance (mm ) of water swollen gel sheet (extensibility)
Evaluation method: After a dry gel sheet is immersed in ion-exchanged water for 5 minutes at room temperature to prepare a water-swollen gel sheet, a penetration test is performed using a texture analyzer (Texture analyzer, TA-XT2i manufactured by Stable Micro Systems). The breaking strength and breaking distance of the swollen gel sheet were measured by the following procedure.

Test method: A water-swollen gel sheet (50 mm × 50 mm) is placed on a 10 mm diameter perforated platform, and a cylindrical plunger made of stainless steel and having a diameter of 6 mm is pushed vertically, and the strength when the water-swollen gel sheet breaks (break strength: N / cm ² ) and distance (breaking distance: mm).

Evaluation 4) Adhesion of water-swelling gel sheet Evaluation method: A dried gel sheet was immersed in ion-exchanged water for 5 minutes at room temperature to prepare a water-swelling gel sheet, and then a texture analyzer (Texture analyzer, TA made by Stable Micro Systems). -XT2i) was used for the following adhesion test to evaluate the adhesion of the water-swollen gel sheet.

  Test method: A water swollen gel sheet (50 mm × 50 mm) is placed on a perforated platform having a diameter of 10 mm, and a cylindrical plunger made of aluminum and having a diameter of 20 mm is pressed against the water swollen gel sheet with a force of 0.314 N for 5 seconds. It pulled up at a speed of 1.0 mm / s. The absolute value (N · mm) of the negative area caused by the stress and distance generated at that time was defined as the adhesiveness of the water-swelling gel sheet.

  Evaluation criteria: Adhesiveness of 0.05 N · mm or more was evaluated as ◯, and less than 0.05 N · mm was evaluated as ×. A water-swelling gel sheet (50mm x 50mm) is pasted on the back of the hand, and when holding the hand with the pasted side down and repeating the operation of spreading 30 times per minute, the smallest of those that did not peel off for 1 minute This standard was set because the adhesion rate was 0.05 N · mm.

<Result>
As can be seen from the evaluation results shown in Table 2, the dried gel sheets according to the present invention (Example 1: containing xanthan gum and mannans, Examples 2 to 5: containing xanthan gum, mannans and deacylated gellan gum) were evaluated 1 Evaluation was high in all four items. Specifically, the breaking strength (Evaluation 1) of the dried gel sheet is as strong as 80 N / cm ² or more. From the result of Evaluation 2, more water than the moisture content (100%) of the gelled sheet before drying is obtained. It was found that it absorbs water and is excellent in water absorption. Moreover, the water swelling gel sheet prepared by immersing the dried gel sheet in water has a breaking strength (1.5 N / cm ² or more), a breaking distance (extensibility) (5 mm or more) (Evaluation 3), and adhesion (Evaluation 4). ) Was confirmed to be excellent in all cases.

  Further, from the comparison between Example 1 and Examples 2 and 3, by using deacylated gellan gum in combination with xanthan gum and mannan, the dry gel sheet absorbs water more than necessary and suppresses the gel from swelling up to a certain amount. After absorbing water, the gel sheet did not change in size. Therefore, even when the water absorption time is excessively long, it is possible to maintain a user-friendly swelling state. On the other hand, dry gel sheets (Comparative Examples 5 to 6 and Comparative Examples 1 and 2) prepared using xanthan gum alone or a combination of xanthan gum and deacylated gellan gum as gelling agents all have low breaking strength (Evaluation 1), Moreover, when this was impregnated with ion-exchanged water, the dried gel sheet was dissolved (Evaluation 2), and it was found that the water-swollen gel sheet intended by the present invention could not be obtained. In addition, dry gel sheets (Comparative Examples 7 to 8) prepared by using mannans (locust bean gum) alone as a gelling agent have a low breaking strength (Evaluation 1) and are dissolved in ion-exchanged water. (Evaluation 2), it was found that the water-swelling gel sheet intended by the present invention could not be obtained.

  Dry gel sheets (Comparative Examples 3 and 4) prepared by using mannans (locust bean gum) and deacylated gellan gum as gelling agents do not absorb water sufficiently even when impregnated with ion exchange water (water absorption 50). (Less than%) (Evaluation 2), it was not restored to a state where it could be used as a water-swollen gel sheet.

  In the dry gel sheet (Comparative Examples 9 and 10) prepared by using deacylated gellan gum alone as a gelling agent, a dry gel sheet having sufficient strength was not formed regardless of the amount of deacylated gellan gum added ( Evaluation 1).

  A dry gel sheet (Comparative Example 11) prepared using native gellan gum alone as a gelling agent gave satisfactory results for evaluations 1 to 4, but the gelation temperature was higher than other gelling agents. Because it gels at 70-80 ° C, it is gelled in the middle of pouring the solution at the time of preparation, or it is gelled immediately after pouring and the thickness becomes non-uniform so that the temperature control during production is strict There was a problem in the manufacturing process, such as having to make it.

  The dried gel sheets of Comparative Examples 12 to 14 prepared by using agar alone, κ-carrageenan alone, or κ-carrageenan and locust bean gum as gelling agents all have poor water absorption and are immersed in water. The water swollen gel sheet prepared in this manner lacked adhesion.

  Based on the above results, the gel strength of xanthan gum and mannans is used in combination, or the gel gel is further used in combination with deacylated gellan gum to prepare a dry gel sheet. It was confirmed that a dry gel sheet superior to a dry gel sheet prepared using another gelling agent was obtained in terms of the recovery rate by the above-described method, the breaking strength of the water-swelling gel sheet, and the adhesion.

Evaluation 5) Water content and water activity value of dry gel sheet (1) Method of measuring water content:
The dried gel sheet (mass before treatment: about 3 g) was heated at a heater temperature of 105 ° C. for 10 minutes using a heat drying moisture meter (manufactured by A & D Co., Ltd., heat drying moisture meter MX-50). The moisture content is calculated from the mass (g) before and after the heat drying according to the following formula.

(2) Measuring method of water activity value:
Measured using a water activity meter (water activity meter WA-360 manufactured by Shibaura Electronics Co., Ltd.).

  The results are shown in Table 3.

  Although the application example of the dry gel sheet of Examples 1-5 prepared above is illustrated below, this invention is not limited to these.

Example 6 Cooling sheet (1)
The dried gel sheet obtained in Example 1 was immersed in water for 5 minutes to obtain a water-containing gel sheet (water swollen gel sheet).

  Skin was able to be cooled by sticking this water swelling gel sheet on skin. Therefore, the dry gel sheet of the present invention can be used by being applied to a portion to be cooled as a cooling sheet by absorbing water and swelling it, when it is desired to cool the body during heat generation or after sports. This water-swelling gel sheet has excellent adhesion to the skin, but does not stick after being peeled off, and is highly extensible, so even if it is attached to the elbow or knee, it will follow the body movement to some extent. It was also confirmed that it did not easily peel off.

Example 7 Gel sheet seasoning The dried gel sheet obtained in Example 2 above was soaked in commercially available broth soy sauce for 30 minutes to obtain a gel sheet soy sauce (soy sauce swelling gel sheet) containing soy sauce.

  This soy sauce swelling gel sheet was put on nigiri sushi and ate together. Soy sauce does not drip from nigiri sushi, for example, if it is used for lunch, etc., it can be thought that it will be a very convenient seasoning because soy sauce can be avoided from flowing around and flowing around the surrounding ingredients. . It is also possible to reliably add a certain amount to the food.

Example 8 Lotion Sheet A gel containing lotion by immersing the dried gel sheet obtained in Example 3 above (size: length 50 mm × width 50 mm × thickness 0.1 mm) in 10 ml of a commercial soft lotion for 5 minutes. A sheet (swelling water swelling gel sheet) was obtained.

  When this gel sheet is applied to the eyes and used for 10 minutes, it has better adhesion to the skin than those obtained by impregnating lotion with a sheet of paper or non-woven fabric, and peels from the skin during use. There was no such thing as falling. Moreover, there was no stickiness to the skin, and both the flexibility and the feeling of use of the sheet were satisfactory. Furthermore, it was felt that the moisture of the skin increased after use compared to before use. Moreover, since the dried gel sheet before being swollen by immersing it in skin lotion is easily cut with scissors or the like, it can be cut out and used in accordance with the use site such as the eyes. Moreover, since a transparent swelling gel sheet is obtained when using a transparent lotion, the sheet does not stand out even after being applied to the face.

Example 9 Cooling sheet (2)
The dried gel sheet obtained in Example 4 (size: length 50 mm × width 50 mm × thickness 0.1 mm) was immersed in 10 ml of an aqueous solution containing menthol-based fragrance for 10 minutes, and a gel-like sheet containing menthol-based fragrance (menthol) A perfume-containing water-swelling gel sheet) was obtained.

  This gel sheet was rich in flexibility and excellent in adhesion to the skin, and even if it was affixed to the forehead and used for 30 minutes, it did not peel off from the skin. Moreover, there was no stickiness, and a cool cooling feeling was maintained during use, and the feeling of use was satisfactory. In addition, since the dried gel sheet before being swollen by being immersed in water is easily cut with scissors or the like, it can be used by cutting out according to the use site such as the forehead and neck.

Example 10 Bacteria Test Sheet The dried gel sheet obtained in Example 5 above (size: 50 mm long × 50 mm wide × 0.1 mm thick) was sterilized by gamma irradiation (25 kgy), and then autoclaved (121 ° C., 20 minutes) Soybean casein digest solution (casein made peptone 1.5%, soybean made peptone 0.5%, sodium chloride 0.5%) soaked for 10 minutes to obtain a gel sheet (gel sheet for bacterial test) It was.

  A standard bacterium solution of Staphylococcus aureus was smeared on this gel sheet, placed in a sterile petri dish, and cultured at 37 ° C. for 2 days. In the same manner as in the case of using Kenkyu Kagaku, glossy spherical yellow colonies peculiar to Staphylococcus aureus were formed on the gel sheet.

Claims (7)

A dry gel sheet comprising xanthan gum, deacylated gellan gum as a gelling agent, and at least one mannan selected from the group consisting of glucomannan and galactomannan, wherein xanthan gum and deacylated gellan gum A dry gel sheet, wherein the aqueous solution containing mannans is formed into a sheet and then dried to adjust the water activity value to 0.6 or less. The dry gel sheet according to claim 1, wherein the mixing ratio of xanthan gum and mannans is 1: 9 to 9: 1 (mass ratio). The dry gel sheet according to claim 1 or 2, wherein the galactomannan is at least one selected from the group consisting of locust bean gum and tara gum. The dry gel sheet according to any one of claims 1 to 3, wherein the content of the deacylated gellan gum is 2 to 50 parts by mass with respect to 100 parts by mass of the total amount of xanthan gum and mannans. The preparation method of the water swelling gel sheet which has the process of impregnating the dry gel sheet in any one of Claims 1 thru | or 4 with an aqueous solution. The aqueous solution to be impregnated into the dry gel sheet is at least one selected from the group consisting of a component having a moisturizing action, a component having a cooling action, a component having an analgesic action, a component having an anti-inflammatory action, a nutritional ingredient, and a seasoning ingredient. The preparation method of the water swelling gel sheet of Claim 5 which is aqueous solution containing. A water-swelled gel sheet prepared by the method according to claim 5 or 6 .