JP2000342193A - Edible film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an edible film, soluble in cold water, having a weak moisture absorption and not becoming sticky at its surface under a high humidity, at a low cost. SOLUTION: This edible film is produced by forming and drying an aqueous solution containing a hydroxypropylated starch of which viscosity of 25% aqueous solution is 10-10,000 cps measured by a BM type viscometer of 30 rpm at 50 deg.C and also having 2-10% hydroxypropyl group.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an edible film.

[0002]

2. Description of the Related Art Conventionally, edible films include those using pullulan, carrageenan, agar, gelatin and the like.

[0003]

The above-mentioned film raw materials are all expensive. The pullulan film has a very strong solubility in water, a high hygroscopicity, and has a disadvantage that it is sticky under high humidity. Carrageenan, agar, and gelatin films are difficult to dissolve in cold water.This is used for printing on films with edible ink, dissolving the film with the moisture of food pasted on the surface of food, and transferring only print. Then it is a disadvantage.

[0004]

Means for Solving the Problems Starch is an inexpensive polysaccharide, and unmodified starch has been conventionally used for an oblate. However, the formed films are very brittle. In addition, when the film is not flexible and the film is thick, it is easily broken and does not have a large area. When a film is formed from hydroxypropylated starch, a flexible and tough product is obtained, but the solubility in cold water is not sufficient. It has been discovered that the use of hydroxypropylated starch, which has a lower aqueous solution viscosity than the raw starch, increases the cold water solubility of the formed film. Furthermore, it was discovered that the addition of one or more selected from the group consisting of polyhydric alcohols, sugar alcohols, monosaccharides, disaccharides, oligosaccharides and starch degradation products increases the flexibility and cold water solubility of the film, As a result of intensive studies, the present invention has been completed.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hydroxypropylated starch that can be used in the present invention can be obtained by subjecting corn starch, high amylose corn starch, waxy corn starch, potato starch, tapioca starch, wheat starch, rice starch or the like to hydroxypropylation by a conventional method. can get. For example, it can be obtained by adding propylene oxide to a starch suspension in water, adding caustic soda as a catalyst, stirring and reacting, neutralizing, filtering and drying. The content of the hydroxypropyl group is preferably 2 to 10%, and below this, the film becomes inflexible and brittle, and the solubility in cold water deteriorates. In addition, even more than this, the flexibility of the film, the cold water solubility is not further improved,
The production cost of hydroxypropylated starch increases.

[0006] In order to improve the operability and increase the solubility of the film in cold water, the hydroxypropylated starch may be decomposed with an oxidizing agent, an acid, an enzyme or the like to reduce the viscosity in an aqueous solution. At this time, the viscosity of the 25% aqueous solution was measured at 50 ° C. with a BM type viscometer at 30 rpm.
-10,000 cps, preferably 10-1000 cps
Can be used. If it is less than 10 cps, the film formability will be poor.

Polyhydric alcohols usable in the present invention include propylene glycol and glycerin, sugar alcohols such as sorbitol, mannitol, maltitol, xylitol and reduced starch saccharified products, and monosaccharides such as glucose, fructose and galactose. Examples of disaccharides such as xylose include sugar, maltose, lactose, and trehalose. Examples of the oligosaccharide and starch hydrolyzate include galacto-oligosaccharide, fructooligosaccharide, starch hydrolyzate and acid hydrolyzate. The hydroxypropylated starch and the mixing ratio thereof differ depending on the required flexibility of the film and the solubility in cold water, but it is preferably 0.3 parts by weight or less per 1 part by weight of the starch.

Further, it may be used in combination with other film base materials such as pullulan, gelatin, carrageenan and agar. A film can be produced from these aqueous solutions by a known method such as a wet casting method, a freeze drying method, and an extrusion molding method.

[0009]

The present invention will be described below in detail with reference to examples.

[0010]

Example 1 Hydroxypropylated potato starch having 7% hydroxypropyl group was acid-decomposed by a conventional method, and the viscosity of a 25% aqueous solution was measured at 50 ° C. with a BM type viscometer at 30 rpm to produce 8000 cps starch. did. 5g of this starch
Was added to 100 ml of ion-exchanged water, dissolved by heating, degassed under reduced pressure, cast on a polyethylene terephthalate film, and dried with hot air to obtain a film having a water content of 10% and a thickness of 20 μm. The same operation was carried out using potato starch instead of hydroxypropylated starch, but the film was brittle and a large area film was not obtained.

[0011]

Example 2 As in Example 1, 5 g of hydroxypropylated potato starch and 0.5 g of glycerin were added to 100 ml of ion-exchanged water, dissolved by heating, defoamed under reduced pressure, and applied to a polyethylene terephthalate film. The film was cast and dried with hot air to obtain a film having a water content of 12% and a thickness of 21 μm.

[0012]

Example 3 As in Example 1, 5 g of hydroxypropylated potato starch having a reduced viscosity, 0.5 g of glycerin, and DE
0.5 g of a starch enzyme hydrolyzate of 20
The resulting mixture was heated and dissolved under reduced pressure, defoamed under reduced pressure, cast on a polyethylene terephthalate film, and dried with hot air to obtain a film having a water content of 12% and a thickness of 20 μm.

[0013]

Example 4 Hydroxypropylated tapioca starch having 3% of hydroxypropyl groups was acid-decomposed by a conventional method, and the viscosity of a 25% aqueous solution was measured at 50 ° C. with a BM type viscometer at 30 rpm to produce 5000 cps starch. did. This starch 5
g, 0.5 g of sorbitol and 0.5 g of sugar were added to 100 ml of ion-exchanged water, dissolved by heating, degassed under reduced pressure, cast on a polyethylene terephthalate film, dried with hot air, and dried with hot water of 15% and thickness of 15 μm. A film was obtained.

[0014]

Example 5 Hydroxypropylated potato starch having a hydroxypropyl group of 5% was enzymatically decomposed by a conventional method, and the viscosity of a 25% aqueous solution was measured at 50 ° C. with a BM type viscometer at 30 rpm to produce a starch of 70 cps. did. 50g of this starch
Was added to 100 ml of ion-exchanged water, dissolved by heating, degassed under reduced pressure, cast on a polyethylene terephthalate film, and dried with hot air to obtain a film having a water content of 12% and a thickness of 37 μm.

[0015]

Example 6 Hydroxypropylated potato starch having a hydroxypropyl group of 5% was acid-decomposed by a conventional method, and the viscosity of a 25% aqueous solution was measured at 50 ° C. with a BM type viscometer at 30 rpm to produce a starch of 700 cps. did. 25g of this starch
Was added to 100 ml of ion-exchanged water, dissolved by heating, degassed under reduced pressure, cast on a polyethylene terephthalate film, and dried with hot air to obtain a film having a water content of 13% and a thickness of 31 μm. Each of the films obtained in Examples 1 to 6 had low hygroscopicity and did not have a sticky surface even under a humidity of 81%.

[0016]

Comparative Example 1 10 g of pullulan PF-20 (Pullulan manufactured by Hayashibara Co., Ltd.) was added to 100 ml of ion-exchanged water, dissolved by heating, degassed under reduced pressure, cast on a polyethylene terephthalate film, and dried with hot air. Moisture 12%, thickness 22
A μm film was obtained. This film was highly hygroscopic and had a sticky surface at a humidity of 81%.

[0017]

Comparative Example 2 981 (Carrageenan, manufactured by Taiyo Kagaku Co., Ltd.) was added to 100 ml of ion-exchanged water, dissolved by heating, degassed under reduced pressure, cast on a polyethylene terephthalate film, dried with hot air, and dried with hot water.
%, A film having a thickness of 24 μm was obtained.

[0018]

Comparative Example 3 Hydroxypropylated potato starch having 7% hydroxypropyl groups (25% aqueous solution having a viscosity of 50 ° C.
Was measured at 30 rpm with a BM type viscometer.
5 g of deionized water 10
0 ml, heat-dissolved, defoamed under reduced pressure, cast on a polyethylene terephthalate film, and dried with hot air to obtain a film having a water content of 10% and a thickness of 20 μm.

[0019]

Comparative Example 4 Oxidized potato starch (viscosity of 25% aqueous solution
Measured at 50 rpm at 30 rpm with a BM type viscometer, 90 c
ps) 50 g was added to 100 ml of ion-exchanged water, dissolved by heating, degassed under reduced pressure, cast on a polyethylene terephthalate film, dried with hot air, moisture 12%, thickness 3
A 5 μm film was obtained.

[0020]

Comparative Example 5 Hydroxypropylated potato starch having a hydroxypropyl group of 1% was acid-decomposed by a conventional method, and the viscosity of a 25% aqueous solution was measured at 50 ° C. with a BM type viscometer at 30 rpm to produce a starch of 7000 cps. did. 5g of this starch
Was added to 100 ml of ion-exchanged water, dissolved by heating, degassed under reduced pressure, cast on a polyethylene terephthalate film, and dried with hot air to obtain a film having a water content of 11% and a thickness of 21 μm.

[0021]

Comparative Example 6 Hydroxypropylated potato starch having 12% hydroxypropyl groups was acid-decomposed by a conventional method, and the viscosity of a 25% aqueous solution was measured at 50 ° C. with a BM type viscometer at 30 rpm to produce 6000 cps starch. did. This starch 5
g was added to 100 ml of ion-exchanged water, dissolved by heating, degassed under reduced pressure, cast on a polyethylene terephthalate film, and dried with hot air to obtain a film having a water content of 10% and a thickness of 20 μm.

The films obtained in the above Examples and Comparative Examples were cut into 5 cm × 5 cm, immersed in a 200 ml beaker containing 100 ml of ion-exchanged water at 25 ° C., and the time required for complete dissolution was measured. Table 1 shows the results.

[0023]

[Table 1]

[0024]

As described above, according to the present invention, an edible film can be produced at low cost. This film has low hygroscopicity and does not have a sticky surface even under high humidity. It is soluble in cold water, and its solubility can be adjusted if necessary. By using a hydroxypropylated starch having a reduced viscosity, the operability during film formation is improved, and the cold water solubility of the film is increased.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuo Sasaoka 3-3-29 Mitsuya Kita, Yodogawa-ku, Osaka-shi, Osaka F-term (reference) 4B035 LE06 LG05 LG19 LG20 LG21 LP24 LP59

Claims (2)

[Claims] 1. The viscosity of a 25% aqueous solution is measured at 30 ° C. with a BM type viscometer at 50 ° C. and is from 10 to 10,000 cp.
edible film obtained by forming and drying an aqueous solution containing hydroxypropylated starch having a hydroxypropyl group content of 2 to 10%. 2. The viscosity of a 25% aqueous solution is measured at 30 ° C. with a BM type viscometer at 50 ° C. and is 10 to 10,000 cp.
s and a hydroxypropylated starch having a hydroxypropyl group content of 2 to 10%, further comprising one selected from the group consisting of polyhydric alcohols, sugar alcohols, monosaccharides, disaccharides, oligosaccharides and starch degradation products Edible film characterized by containing the above