JPH0736983U - Antibacterial rice scoop - Google Patents

Abstract

(57) [Summary] [Purpose] There is almost no discoloration due to the influence of food, and discoloration with time does not occur even if a discoloration preventive agent or the like is not used. [Structure] At least the spatula portion 2 of the antibacterial rice scoop 1,
Preferably, the spatula portion 2 and the handle portion 3 are made of an antibacterial material made of a synthetic resin and an antibacterial agent. The synthetic resin can be mixed with an antibacterial agent, and is usually required as a rice scoop, for example, predetermined strength characteristics, water resistance,
There is no particular limitation as long as it has heat resistance, non-toxicity and the like and does not attach an unpleasant taste or smell to food. Magnesium aluminometasilicate, which is the base material of the antibacterial agent component, is represented by the chemical formula: Al ₂ O ₃ · xMgO · ySiO ₂ · zH ₂ O [where x is 1 or 2 and y and z are integers of 1 or more]. It has a strong ion exchange capacity and is insoluble in water. The antibacterial metal ion that is ion-exchanged with the metal ion of the base material is usually a metal ion used as an antibacterial agent, for example, Ag, Cu, Zn, Sn, Hg, P.
Metal ions such as b and Cd can be used alone or in combination.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an antibacterial rice scoop that can keep the surface of a scoop (sterling) in a sterile state even after long-term use.

[0002]

[Prior art and its problems]

 In recent years, due to the demand for hygiene control of food, the antibacterial rice scoops have been used not only for commercial use but also for general households, instead of the wooden, bamboo, and synthetic resin scoops that have not been used for a long time. It has come to be used. As such an antibacterial rice scoop, an antibacterial rice scoop made of a material containing zeolite carrying an antibacterial metal ion is known (Japanese Utility Model Publication No. 4-28545, etc.), and the antibacterial effect is satisfactorily satisfied. It seems that what should be done has been obtained.

[0003] Shamoji originally comes into contact with various foods or ions in foods due to its use. However, some foods contain ions that easily exchange ions with antibacterial metal ions or have high concentration of ions. It contains or. In particular, sodium chloride is contained in a large amount in sodium chloride, and sodium ions are most easily exchanged with silver ions. Therefore, the antibacterial rice scoop has a problem that it is discolored gradually due to the influence of seasonings such as salt and vinegar, or when it is used for a long time, and the taste is slightly changed by silver ions. It was

[0004]

[The purpose of the device]

 The present invention solves the above-mentioned problems, has almost no discoloration due to the influence of food, and has an excellent antibacterial property that does not cause discoloration with time even if a discoloration preventive agent or the like is not used. The purpose is to provide rice scoops that do not affect the taste.

[0005]

DETAILED DESCRIPTION OF THE INVENTION The antibacterial rice scoop of the present invention is characterized by containing magnesium metasilicate aluminate carrying an antibacterial metal component.

[0006]

[Specific explanation of the device]

 The present invention will be specifically described below. FIG. 1 shows a perspective view of an antibacterial scoop 1 which comprises a spatula 2 and a handle 3 which are relatively flat. At least the spatula portion 2, and preferably both the spatula portion 2 and the grip portion 3 of the antibacterial scoop 1 are made of an antibacterial material composed of a resin and an antibacterial agent described later.

The resin constituting the antibacterial material can be mixed with the antibacterial agent described later, and usually has properties required as a scoop, such as predetermined strength properties, water resistance, heat resistance, and nontoxicity. However, there is no particular limitation as long as it does not give an unpleasant taste or smell to food.

Examples of such resins include fluororesins, acrylic resins, polyamides, vinyl chloride resins, polycarbonates, polyolefins, epoxy resins, polyacetals, polyesters, polyetherimides, polyethersulfones, polyetheretherketones, There may be mentioned thermoplastic synthetic resins such as polyphenylene sulfide, polysulfone, polyarelate, polyethylene naphthalate, polymethylpentene, ABS resin, vinyl acetate resin and polystyrene. Of these, polyamide, polyethylene and polypropylene are most suitable in terms of heat resistance, food hygiene, strength characteristics and price.

As the thermosetting resin, for example, melamine resin, phenol resin, urea resin, furan resin, alkyd resin, unsaturated polyester, diallyl phthalate resin, epoxy resin, silicon resin, polyurethane, polyimide, Examples thereof include polyparabanic acid.

Next, the antibacterial agent mixed in the resin will be described. In the present invention, magnesium metasilicate aluminate, which is a base material of the antibacterial agent component, has a chemical formula of Al ₂ O ₃ · xMgO · ySiO ₂ · zH ₂ O [where x is 1 or 2 and y and z are 1 or more. Integer], has a strong ion exchange capacity, and is insoluble in water. Therefore, the base material and metal ions do not elute in water and the antibacterial activity does not decrease. Also, magnesium aluminometasilicate has no problem in terms of safety. Magnesium aluminometasilicate can be usually obtained by reacting basic magnesium aluminate with sodium silicate.

The antibacterial metal ion ion-exchanged with the metal ion of the base material is usually a metal ion used as an antibacterial agent or a bactericide, for example, Ag, Cu, Zn, Sn, Hg, Pb, Cd. These metal ions can be used alone or in combination. Among them, metal ions of Ag, Cu, Zn, and Sn are desirable from the viewpoint of safety for human body, and in particular, the combination of Ag-Zn is extremely excellent in antibacterial effect.

These metal ions are ion-exchanged with the metal ions of magnesium aluminometasilicate described above by a conventional method. For example, ion exchange of Ag, Cu, Zn, Sn, etc. is carried out in a region lower than the pH value for forming hydroxide and in which magnesium aluminometasilicate is not dissolved. That is, the range of pH is 9 to 4 for Ag, the range of pH 6 to 4 for Cu, and the range of pH 9 to 4 for Zn, and the temperature range of 60 ° C. or higher is desirable.

The metal ion to be ion-exchanged can be used in the form of chloride or sulfate, but it is preferable to use nitrate which hardly retains an anion. The proportion of the antibacterial metal ions to be ion-exchanged is appropriately 0.1 to 90 mol% of the ion-exchange capacity possessed by magnesium metasilicate aluminate. Further, the ratio of the ion-exchanged metal ions in the antibacterial agent is preferably 0.01 to 40% by weight. If the ratio of metal ions is less than the above-mentioned minimum value, the antibacterial property is not sufficiently exerted. On the other hand, if it exceeds the maximum value, the metal ions become unstable and the antibacterial effect is stable and stable. Will lack.

After the ion exchange operation, the antibacterial agent is obtained by washing and drying according to a conventional method. In this state, the antibacterial metal ions are fixed to the base material, magnesium aluminometasilicate, but the antibacterial metal ions are firmly fixed by baking at a temperature of 300 ° C or higher after the drying. You may.

The antibacterial agent that constitutes the antibacterial material is hardly affected by the type and concentration of ions in the environment in which it is used. In other words, this antibacterial agent contains few metal ions in the free state, is less susceptible to oxidation by heating and light, does not undergo re-exchange of silver ions, and silver chloride of silver ions due to excessive elution of silver ions. It does not cause metallization or metallic silver due to light. Therefore, it is possible to prevent discoloration due to the reaction between the protein or amino acid in the food and the silver ion.

The antibacterial material is prepared by mixing the antibacterial agent obtained as described above and the resin. There is no particular limitation on the mixing method, and for example, a method of kneading an antibacterial agent into a resin is used. When the antibacterial scoop of the present invention is made of a uniform resin as a whole, the antibacterial agent is contained in the resin in an amount of 0.1 to 60% by weight, preferably 1 to 50% by weight.

The antibacterial agent preferably has a particle size of 30 μm or less, particularly 5 μm or less, in order to improve dispersibility when blended in a resin. Molding of the antibacterial rice scoop can be carried out in the same manner as molding of ordinary resin rice scoops. Further, the surface of a scoop-shaped core material made of an appropriate material such as wood, bamboo or synthetic resin may be coated with a resin layer containing the antibacterial agent, or the core material may be a resin containing the antibacterial agent. The sheets may be fused together. According to this method, the amount of antibacterial agent used can be reduced.

[0018]

【Example】

 An antibacterial agent (A) composed of magnesium metasilicate aluminate carrying 1.5% by weight of Ag and 5.0% by weight of Zn as an antibacterial metal component (Catalyst Kasei Co., Ltd., trade name Ice-NAZ320), and The following tests were conducted using an antibacterial agent (B) composed of zeolite in which Ag 2.0 wt% and Zn 5.0 wt% were carried.

[Silver Elution Test] 5 g of each of the antibacterial agents (A) and (B) was weighed, added to 250 ml of tap water, stirred at 25 ° C. for 15 minutes, filtered, and the silver in the filtrate was added. Ions were measured by emission plasma analysis. From the measurement results shown in Table 1, it is found that the antibacterial agent (A) has a very small amount of silver ion leached out.

[0020]

TABLE 1 specimen silver ions in an amount antimicrobial agent (A) <10 ppb antimicrobials (B) 1050 ppb

[Antibacterial Test] Polystyrene was added with and mixed with antibacterial agents (A) and (B) in an amount of 1.0% by weight to prepare test pieces. After washing the surface of each sample piece with ethanol, place 50 μl of the bacterial suspension on 6 surfaces on one side, leave at 28 ° C. for 24 hours and 48 hours, and then wash the bacterial suspension with physiological saline. The viable cell count of this washed-out solution was measured by a cell count measuring method using a cell count medium. In addition, the viable cell counts of the initial bacterial suspension (0 hour) and the preserved bacterial suspension (stored at 28 ° C.) 24 hours and 48 hours after were measured respectively, and measured for 0 hour, 24 hours, and 48 hours. Served as a control.

The test conditions are as follows. (1) Test strain ・ Escherichia coli IFO 3301 [Escherichia coli] ・ Staphylococcus aureus ATCC 6538P [Staphylococcus aureus] (2) Culture medium for bacterial count 0.2% meat extract Added normal agar medium (3) Preparation of bacterial solution After culturing in ordinary broth medium at 37 ° C. overnight, it was prepared using sterile physiological saline so that the number of bacteria per ml was 10 ⁴ to 10 ⁵ .

From the test results shown in Table 2, it can be seen that the test piece of the present invention has an excellent antibacterial effect. The indication "<10" in Table 2 is due to the limit of measurement when using the culture medium for measuring the number of bacteria, and means that no bacteria were detected.

[0024]

[Table 2] Elapsed time test bacteria test piece 0 hours 24 hours 48 hours E. coli Antibacterial agent (A) 4.8 × 10 ⁴ <10 <10 〃 Antibacterial agent (B) 4.6 × 10 ⁴ 2.1 × 10 ⁴ 1.9 × 10 ⁴ 〃 Control 4.6 × 10 ⁴ 3.6 × 10 ⁴ 1.5 × 10 ⁴ Staphylococcus antibacterial agent (A) 5.1 × 10 ⁴ <10 <10 〃 Antibacterial agent (B) 5.2 × 10 ⁴ 2.3 × 10 ⁴ 2.1 × 10 ⁴ 〃 Control 5.4 × 10 ⁴ 2.9 × 10 ⁴ 2.8 × 10 ⁴

[Discoloration Test] Using a polystyrene scaffold containing 1.0% by weight of each of the antibacterial agents (A) and (B), a test for colorability or discoloration was conducted. As a test method, first, a test piece obtained by cutting the scooped rice scooped product into pieces having a size of about 2 cm × 5 cm × 0.3 cm was used, and each of the test pieces was brought into direct contact with the food or chemicals shown in Table 3. Regarding the contact conditions, the test piece, food, etc. were put in a beaker, covered with wrap, and then left at room temperature in a place not exposed to direct sunlight for 9 days.

The discoloration and coloration of the test piece were visually evaluated according to the following 5 grades. Evaluation criteria; 1-with severe discoloration 2-with relatively noticeable discoloration 3-with discoloration 4-with slight discoloration 5-without discoloration From the evaluation results shown in Table 3, the test piece of the present invention is almost discolored with seasonings and the like. I know I will not.

[0027]

TABLE 3 test piece food / drug products antimicrobial agent (A) an antibacterial agent (B) 10% sodium hydroxide 5 4 10% acetic acid 5 3-4 10% Haiter 5 3-4 wasabi 5 1 mustard 5 1 Garlic (raw) 5 2 Garlic (boiled) 5 3 Garlic odor (gas) 5 1 Miso 5 4-5 Soy sauce 5 3-4 Source 5 3-4 Raw meat 5 3 Loin ham 5 2

[0028]

[Effect of device]

 The antibacterial rice scoop of the present invention can kill bacteria attached to the surface of the rice scoop by the bactericidal action of the antibacterial agent in which the antibacterial metal component is supported on the magnesium metasilicate aluminate carrier, and the surface can be kept sterile. . Therefore, the sanitary control of the rice scoop can be facilitated, and the rice scoop can be used cleanly and hygienically for a long period of time, or can be stored.

[0029] Moreover, since magnesium metasilicate aluminate carrying an antibacterial metal component does not elute the antibacterial metal component, it does not change the taste of the food and the rice scoop It also has an excellent effect that it hardly discolors due to the influence of food and does not discolor over time.

[Brief description of drawings]

FIG. 1 is a perspective view of an antibacterial rice scoop according to the present invention.

[Explanation of symbols]

 1 Antibacterial rice scoop 2 Spatula part 3 Handle part

Claims (1)

[Scope of utility model registration request] 1. An antibacterial rice scoop containing magnesium aluminometasilicate carrying an antibacterial metal component.