Food-grade fruit toothpaste for children and preparation method thereof

Abstract

The invention discloses food-grade fruit toothpaste for children and a preparation method thereof, and belongs to the technical field of toothpaste for children, the toothpaste comprises the following raw materials: kiwi fruit juice, kiwi fruit peel flavone concentrate, eggshell powder, sucrose fatty acid ester, a thickening agent, xylitol, citric acid, glycerol, pigment, essence and potassium sorbate; wherein the thickening agent is prepared from sodium carboxymethyl cellulose and xanthan gum; the food-grade fruit toothpaste for children is obtained by uniformly mixing the raw materials to form paste, then extruding the paste into a tube under a vacuum condition and then sterilizing in a water bath. The children's toothpaste prepared from the red kiwi fruit as the main raw material is free of granular sensation, pink in color, glossy in surface, fragrant in smell, soft in texture, moderate in viscosity and beneficial to care of children's tender oral health, and the pH value ranges from 6 to 7.

Description

Technical Field

[0001] The invention belongs to the technical field of children's toothpaste, and in particular relates to a food-grade fruit children's toothpaste and a preparation method thereof. Background Art

[0002] Toothpaste is a paste-like substance composed of a mixture of moisturizers, abrasives, thickeners, water, sweeteners, fragrances and other additives. At present, the scale of child consumers in China has reached 220 million, and the price of children's toothpaste is generally higher than that of adult toothpaste. In addition, children's oral mucosa is particularly delicate, their teeth are relatively fragile, and bacteria are easy to breed. Abrasives with high friction can easily damage children's teeth; those containing highly irritating ingredients can damage oral mucosa and taste; and fluoride toothpaste or those with added chemical ingredients will have certain safety risks. With the improvement of living standards, more and more parents prefer to choose food-grade children's toothpaste without fluoride, chemical additives or added Chinese herbal medicine to ensure higher safety and functionality.

[0003] Therefore, there is an urgent need to provide a fruit children's toothpaste and a preparation method thereof which has low production cost, can reasonably utilize resources and can reach food grade. Summary of the invention

[0004] In view of the above technical problems, the present invention proposes a food-grade fruit children's toothpaste and a preparation method thereof. The present invention takes the paste hardness and wire drawing length of the toothpaste as reference characteristics, takes abrasives, moisturizers and thickeners as investigation factors on the basis of single factor experiments, adopts an orthogonal test optimization combined with a sensory evaluation method, and finally determines the optimal process for paste molding through TPA analysis.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] One of the technical solutions of the present invention:

[0007] A food-grade fruit toothpaste for children, comprising the following food-grade raw materials:

[0008] Kiwi fruit juice, kiwi fruit peel flavonoid concentrate, eggshell powder, sucrose fatty acid esters, thickener, xylitol, citric acid, glycerin, color, flavor and potassium sorbate;

[0009] The thickener comprises sodium carboxymethyl cellulose and xanthan gum.

[0010] Optionally, the food-grade fruit toothpaste for children comprises the following raw materials in terms of weight percentage:

[0011] 10% kiwi juice, 4% kiwi peel flavonoids concentrate, 10-20% eggshell powder, 2% sucrose fatty acid ester, 0.5-1.5% thickener, 10% xylitol, 0.2% citric acid, 20-40% glycerol, 0.04% pigment, 0.5% flavor, 0.1% potassium sorbate, and the balance is water.

[0012] Furthermore, the food-grade fruit toothpaste for children comprises the following raw materials in terms of weight percentage:

[0013] 10% kiwi juice, 4% kiwi peel flavonoids concentrate, 10% eggshell powder, 2% sucrose fatty acid ester, 1.5% thickener, 10% xylitol, 0.2% citric acid, 40% glycerin, 0.04% pigment, 0.5% flavor, 0.1% potassium sorbate, and the balance is water.

[0014] Optionally, the mass ratio of CMC to xanthan gum is 1:1.

[0015] Optionally, the kiwifruit variety in the kiwifruit juice and kiwifruit peel flavonoids concentrate is red-heart kiwifruit.

[0016] Optionally, the preparation process of the kiwi fruit peel flavonoid concentrate is:

[0017] The peel of red kiwifruit is dried, crushed, mixed with food-grade ethanol, and subjected to ultrasonication, vacuum filtration and water bath heating in sequence to obtain the kiwifruit peel flavonoid concentrate.

[0018] Further, the solid-liquid ratio of the crushed peel and food-grade ethanol is 1 g: 150 mL;

[0019] The flavonoid content in the kiwifruit peel flavonoid concentrate is 26.87 mg / g.

[0020] Furthermore, the water bath heating condition is: heating in a water bath at 90° C. to concentrate until the solid content reaches 80%.

[0021] Optionally, the preparation process of the kiwifruit juice is: crushing the pulp of red-heart kiwifruit, adding pectinase, and sequentially performing water bath heating and centrifugal separation to obtain the kiwifruit juice.

[0022] Optionally, the eggshell powder is 1200 mesh.

[0023] The second technical solution of the present invention:

[0024] The above raw materials are mixed evenly to form a paste, which is then squeezed into a tube under vacuum conditions, and then sterilized in a water bath to obtain the food-grade fruit children's toothpaste.

[0025] Optionally, the conditions for water bath sterilization are: water bath sterilization at 68° C. for 30 minutes.

[0026] Compared with the prior art, the present invention has the following advantages and technical effects:

[0027] The children's toothpaste paste made from red kiwifruit from Leye County, Baise City, Guangxi as the main raw material has no granularity, pink color, glossy surface, aromatic smell, soft texture, pH value in the range of 6 to 7, and moderate viscosity, and is a good choice for protecting children's tender oral health.

[0028] The toothpaste prepared by the present invention uses the red-heart kiwifruit from Leye County, Baise as the main raw material, is safe and harmless and rich in Chinese herbal medicine ingredients, can reasonably and effectively protect children's dental health, improve the utilization value of Leye red-heart kiwifruit, promote its industrial development, and provide a certain reference value for enriching similar products. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 The present invention is a process flow chart for preparing food-grade fruit toothpaste for children;

[0031] Figure 2 This is a line graph showing the effect of glycerin on the hardness and stringiness of children's toothpaste;

[0032] Figure 3 It is a line graph showing the effect of thickeners (CMC and xanthan gum) on the hardness and stringiness of children's toothpaste;

[0033] Figure 4 This is a line graph showing the effect of abrasive (eggshell powder) on the hardness and stringiness of children's toothpaste;

[0034] Figure 5 It is the state diagram of the orthogonal result sample in Example 1 of the present invention;

[0035] Figure 6 This is a comparison chart of the properties of the children's toothpaste prepared under the optimal conditions in Example 1 of the present invention and the paste on the market. DETAILED DESCRIPTION

[0036] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0037] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0038] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0039] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present invention description and examples are exemplary only.

[0040] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0041] The "room temperature" in the present invention refers to 20-30°C unless otherwise specified.

[0042] The "parts" described in the present invention, unless otherwise specified, refer to parts by mass.

[0043] The raw materials used in the present invention are all purchased from the market. The test instruments, raw materials and reagents used in the following examples are:

[0044] 1. Test equipment

[0045] High-speed multifunctional pulverizer (JP-300C-6, Yongkang Jiupin Industry and Trade Co., Ltd.); ultrasonic cleaner (KH-500B, Kunshan Hechuang Ultrasonic Instrument Co., Ltd.); desktop centrifuge (TD-5, Sichuan Shuke Instrument Co., Ltd.); UV-visible spectrophotometer (752N, Shanghai Yidian Analytical Instrument Co., Ltd.); texture analyzer (CT3, Brookfield, USA).

[0046] 2. Experimental materials and reagents

[0047] Experimental raw materials: Leye red-heart kiwifruit with no mechanical damage, no pests and diseases, no deformities, and consistent shapes, sizes and maturity were purchased from the Leye County Vegetable Market in Baise City, Guangxi; 1200-mesh eggshell powder was purchased from Jiude Health Hall; glycerol was purchased from Lianyungang Xinai Food Technology Co., Ltd.; carboxymethyl cellulose, sodium citrate, food coloring, and potassium sorbate were all purchased from Guangzhou Suixin Chemical Co., Ltd.; xylitol, edible flavors, and pectinase were all purchased from Zhejiang Yinuo Biotechnology Co., Ltd.); xanthan gum was purchased from Henan Wanbang Industrial Co., Ltd.; sucrose fatty acid esters were purchased from Shenzhen Yinuo Food Ingredients Co., Ltd.; anhydrous ethanol was purchased from Anhui Ante Food Co., Ltd.; all of the above raw materials were food grade; rutin, analytical grade, was purchased from Beijing Solaibao Technology Co., Ltd.; sodium nitrite, analytical grade, was purchased from Tianjin Zhiyuan Chemical Reagent Co., Ltd.; aluminum nitrate, analytical grade, was purchased from Chengdu Kelon Chemical Reagent Factory; sodium hydroxide, analytical grade, was purchased from Xilong Chemical Co., Ltd.

[0048] The technical solution of the present invention is further illustrated by the following embodiments.

[0049] Example 1

[0050] like Figure 1 (wherein some additives are omitted, such as potassium sorbate, pigments, and flavors), a method for preparing a food-grade fruit toothpaste for children comprises the following steps:

[0051] (1) Preparation of red kiwi fruit peel flavonoid concentrate and juice:

[0052] Juice: Wash the red kiwifruit and separate the pulp from the peel; crush the pulp with a juicer, add pectinase at a ratio of 1g / L, mix well and heat in a 50℃ water bath for 90min, then divide the slurry into separate tubes and centrifuge at 4000r / min for 10min, the juice yield is about 54.5%, freeze the kiwifruit juice at -18℃ for later use;

[0053] Red kiwifruit peel flavonoid extract: The peel is dried in an oven at 65°C, crushed in a grinder after drying, 5g of peel powder is taken, 60% food-grade ethanol is added according to a solid-liquid ratio of 1:150, and mixed evenly, placed in a 60°C ultrasonic cleaner for 40 minutes, and then transferred into a Buchner funnel for vacuum filtration to obtain a golden filtrate, and the filtrate is concentrated in a 90°C water bath until the solid content reaches 80%, and the concentration is terminated, and the concentrate is refrigerated in a 4-6°C refrigerator for standby use;

[0054] Among them, the determination of flavonoids in the peel of red kiwifruit should be: the flavonoid content of the peel brass concentrate

[0055] Accurately weigh 0.0062g of rutin standard, add 60% ethanol to dissolve, and dilute to the scale in a 25mL volumetric flask. Referring to the sodium nitrite-aluminum nitrate-sodium hydroxide colorimetric method, accurately measure 0, 1, 2, 3, 4, and 5mL of rutin standard solution and place it in a 25mL volumetric flask, add 1mL of 5% sodium nitrite solution, 1mL of 10% aluminum nitrate, and 10mL of 4% NaOH solution in sequence, dilute to 60% ethanol, and shake well. Measure the absorbance at a wavelength of 504nm, use the reagent as the blank, the mass concentration X as the horizontal coordinate, the absorbance Y as the vertical coordinate, and the calculated linear regression equation is: y=0.0957x+0.0605, R 2 =0.9934. Take another 1.00 g of the above peel flavonoid concentrate sample in a 25 mL volumetric flask, add 60% ethanol to dissolve, and dilute to the mark. Take another 1 mL of the sample solution and measure the absorbance according to the standard curve method. Substitute the absorbance into the standard linear equation to obtain the flavonoid content of the peel concentrate.

[0056] W=(C×N×V) / M

[0057] Wherein: W is the flavonoid content of the peel concentrate, mg / g; N is the dilution multiple; V is the volume of the sample solution, mL; M is the weight of the peel concentrate, g.

[0058] (2) preparing a food-grade fruit toothpaste for children, the food-grade fruit toothpaste for children comprising the following raw materials:

[0059] Kiwifruit juice, kiwifruit peel flavonoid concentrate, eggshell powder, sucrose fatty acid esters, CMC, xanthan gum, xylitol, citric acid, glycerin, pigment and potassium sorbate.

[0060] According to the single factor experiment, the above formula was fixed and mixed evenly in a mortar and ground, wherein sucrose fatty acid ester 2%, xylitol 10%, citric acid 0.2%, peel flavonoid concentrate 4%, pigment 0.04%, flavor 0.5%, potassium sorbate 0.1%, kiwi juice 10%, and the balance was water, to form a paste, which was then squeezed into a tube under vacuum conditions. Finally, the filled paste was placed in a 68°C water bath for sterilization for 30 minutes, and the three most influential factors on the preparation of children's toothpaste were investigated: abrasive (eggshell powder), humectant (glycerin), thickener (CMC and xanthan gum, the mass percentages of the two were 0.75% and 0.75%, respectively) The gradients of each factor are: glycerol: 10%, 20%, 30%, 40%, 50%; eggshell powder: 10%, 15%, 20%, 25%, 30%; thickener: 0.25%, 0.5%, 0.75%, 1%, 1.25%.

[0061] Based on the single factor test, abrasives, moisturizers, and thickeners were used as orthogonal test factors, and children's food-grade toothpaste sold on the market was combined with sensory factors as the standard to conduct L9(3 4 ) Orthogonal test, TPA test was performed on the paste using a texture analyzer, and the optimal production process of red kiwi children's food-grade toothpaste was finally determined. Level A glycerol was 20, 30, 40%, level B eggshell powder was 10, 15, 20%, and level C thickener was 0.5, 1.0, 1.5%.

[0062] Effect verification

[0063] 1. Physical and chemical determination and hygienic determination of toothpaste

[0064] The optimal formula was obtained through single factor and orthogonal experiments to make the paste, and then the physical and chemical indicators and hygiene indicators were measured, with the following requirements: the paste is fine and free of foreign matter, pH 5.5-10.5, stability is that the paste does not overflow from the tube, does not separate the liquid, has a normal aroma and color, hard particles are glass slides without scratches, the total colony count is ≤500, and the number of Escherichia coli is ≤30.

[0065] 2. Sensory evaluation standards

[0066] Ten sensory evaluators were selected to score the appearance, paste properties and odor of the finished product. The average value of the results and the sensory evaluation criteria are shown in Table 1.

[0067] Table 1 Sensory rating table

[0068]

[0069] 3. Data processing

[0070] Use SPSS26.0, Excel2019, Origin2021 and other software to draw relevant charts and process data.

[0071] Results and Analysis

[0072] 1. Single Factor Experiment

[0073] 1. The influence of moisturizer on paste forming

[0074] Figure 2 is a line graph showing the effect of glycerin on the hardness and stringiness of children's toothpaste; Figure 2It can be seen that with the increase of the proportion of glycerol, the hardness first increases and then decreases, while the drawing length continues to decrease. The glycerol proportion affects the drawing length of the toothpaste paste more than the hardness; the hardness and drawing length values ​​of 20% and 30% glycerol are close, and then by observing the paste morphology, it is found that the paste with 30% glycerol is more shiny, and finally 30% is determined to be the best glycerol ratio. Moisturizer is one of the main components in toothpaste. Glycerol is the main moisturizer in toothpaste. It plays a role in wetting, thickening and antifreeze in the paste. It can maintain a certain rheology and thixotropy under mechanical action, which is conducive to processing and manufacturing, and gives the paste a certain cold and heat resistance to keep the paste stable and convenient for normal use all year round.

[0075] 2. Effect of thickener on paste forming

[0076] Figure 3 This is a line graph showing the effect of thickeners on the hardness and stringiness of children's toothpaste. Among them, thickeners are the key to studying the stability of toothpaste. Toothpaste is a mixture of solid and liquid phases. In order to stably disperse the powder in the liquid phase, thickeners are needed to improve the rheological properties of the liquid and stabilize the toothpaste paste. Xanthan gum is an acidic extracellular heteropolysaccharide, and sodium carboxymethyl cellulose is a water-soluble cellulose ether. The compound of CMC and xanthan gum is selected as the thickener, and the mass ratio of the two is 1:1. Figure 3 It can be seen that as the percentage of the thickeners in the two compositions increases, the hardness continues to increase, and the drawing length basically decreases. When observing the shear state of the paste, the sample with a thickener ratio of 1% is easier to flow than the sample with a thickener ratio of 1.5% during the shear process, and it is found that the 1% thickener is better decomposed in water after maintaining a stable state than the 1.5%. Therefore, the proportion of thickener added is determined to be 1%.

[0077] 3. The influence of friction agent on paste forming

[0078] Figure 4 This is a line graph of the effect of abrasives on the hardness and wire drawing of children's toothpaste. It can be seen from the figure that as the proportion of eggshell powder increases, the hardness continues to increase and the wire drawing length continues to decrease. When the proportion of eggshell powder is 10%-15%, the hardness is not much different, but the wire drawing length is greatly reduced, indicating that the greatest impact of the proportion of eggshell powder on the paste is the wire drawing length. Finally, by observing whether the paste is stable and whether there are obvious particles, it is finally determined that the best proportion of eggshell powder is 15%. The cleaning effect of toothpaste is mostly achieved through the abrasive in the toothpaste formula. Adults often use toothpaste with high friction, which is not suitable for children because it will cause wear of the hard tissue of the teeth. Eggshell powder is a natural high-quality calcium abrasive with a wear value much lower than traditional abrasives. It will hardly cause damage to children's teeth and has a low economic cost.

[0079] 4. The results of the orthogonal experiment for paste forming optimization are shown in Table 2:

[0080] Table 2

[0081]

[0082] Table 3

[0083]

[0084] Table 4 Orthogonal test results variance analysis table (α = 0.05)

[0085]

[0086] Note: * indicates significant impact (F value > F0.05); ** indicates extremely significant impact (F value > F0.01)

[0087] From the range analysis of the data in Tables 2, 3, and 4, it can be seen that the influencing factors are mainly Rc>R B >R A , that is, the proportion of thickener has the greatest impact on the paste, followed by eggshell powder, and finally glycerin. The optimal combination conditions are: glycerin 40%, thickener 1.5% (xanthan gum 0.75%, sodium carboxymethyl cellulose 0.75%), eggshell powder 10% sample 7 (corresponding to test 7); variance analysis shows that the F values ​​of glycerin, eggshell powder, and thickener are 8.572, 12.275, and 26.673, respectively, which is consistent with the results of range analysis. The thickener factor is the most important factor affecting the formation of the paste. It is the skeleton of the toothpaste, which can keep the toothpaste in proper viscosity and consistency, easy to extrude and form into strips, and the toothpaste is easy to disperse when brushing teeth, and has good rheological properties.

[0088] 5. Results of the physicochemical properties and hygienic test of the paste

[0089] The proportions of the paste molding process were optimized through orthogonal optimization. The physical and chemical properties of the paste with the highest sensory score adopted the standard of GB / T8372-2017. The paste was delicate, free of foreign matter, had a neutral pH, and no hard particles. The total colony count and E. coli count tests were both qualified.

[0090] 2. Compare the children's toothpaste obtained under the optimal conditions of the present invention with five children's toothpastes on the market:

[0091] Weigh 30g of each of the five children's toothpastes on the market, place them in a 50mL beaker, and shake them slightly to make the surface smooth. The test parameters measured by the TA-10 probe are target distance 4mm, trigger point load 5g, and test speed 0.5mm / s. The sample is tested three times, and the TPA mode is used to simulate the feeling of human hands touching the paste, which is mainly manifested in the brushed effect of the paste. In the data report, each paste has deviations in characteristics. Hardness is the most obvious factor in the difference between the five pastes, followed by brushed length, while viscosity and elasticity are related to the paste morphology. For example, the paste should have moderate viscosity and a glossy surface. Wire drawing length and hardness are the most obvious and characteristic data of the paste, so it was finally determined to consider paste hardness and brushed length as reference characteristics.

[0092] Figure 6 This is a comparison chart of the properties of the children's toothpaste prepared under the optimal conditions in Example 1 of the present invention and the paste on the market. Figure 6 It can be seen that the hardest one is the Boerde children's toothpaste, followed by the Sapling children's toothpaste, and the smallest one is the Raccoon toothpaste. The children's toothpaste with the largest drawing length value is the Red Seal children's toothpaste, followed by the Raccoon children's toothpaste. The overall trend is that the greater the hardness, the smaller the drawing length. From the composition analysis, the friction agent mostly uses silicon-containing substances. Shuke Baby, Sapling, and Raccoon use hydrated silica, Boerde children's toothpaste uses silicon dioxide, and the Red Seal toothpaste uses calcium carbonate as a friction agent, indicating that the paste using silicon dioxide as a friction agent has a larger hardness; the moisturizer mainly uses glycerol, calcium glycerophosphate, sorbitol, and sorbitol, all of which play a role in maintaining the moisture of the paste; all five toothpastes use cellulose gum as a thickener. Although the friction agent used in the Red Seal children's toothpaste is similar to that used in the present invention, the hardness is higher and the drawing length is obvious, indicating that the texture of the paste is not soft enough. The present invention selects the Raccoon toothpaste with a soft texture and obvious drawing effect as a reference indicator. Sample 7 is the best product of the present invention. Compared with the five children's toothpastes on the market, it has a softer texture, moderate drawing length, and a fresh smell. It is a good choice for protecting the health of children's tender oral cavity.

[0093] Conclusion: The present invention is committed to selecting food-grade materials to make children's toothpaste that meets market demand. The pulp and peel of "Leye Red Heart" kiwifruit are used as raw materials for extraction and processing to obtain juice and peel flavonoid concentrate, and the flavonoid content in the peel flavonoid concentrate is measured to be 26.87 mg / g. The addition of natural flavonoid compounds makes the children's toothpaste have potential effects such as anti-inflammatory and antibacterial.

[0094] The present invention studies the process of paste forming test and finds that the most important factors affecting paste forming are the content of moisturizer, abrasive and thickener. Single factor and orthogonal design experiments are combined with texture analyzer analysis, and the optimal process of this product is determined by comparing five children's toothpastes on the market with sensory factors: 40% glycerol, 0.75% xanthan gum, 0.75% sodium carboxymethyl cellulose, 10% eggshell powder, 2% sucrose fatty acid ester, 10% xylitol, 0.2% citric acid, 4% kiwi peel flavonoid concentrate, 0.04% pigment, 0.1% potassium sorbate, 10% kiwi juice, 0.5% flavor, and the balance is distilled water. The prepared toothpaste paste has no granularity, pink color, shiny surface, aromatic smell, soft texture, pH in the range of 6 to 7, and moderate viscosity.

[0095] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A food-grade fruit toothpaste for children, characterized in that: Including the following ingredients: Kiwi fruit juice, kiwi fruit peel flavonoid concentrate, eggshell powder, sucrose fatty acid esters, thickener, xylitol, citric acid, glycerin, color, flavor and potassium sorbate; Wherein, the thickener includes sodium carboxymethyl cellulose and xanthan gum.

2. A food-grade fruit toothpaste for children according to claim 1, characterized in that: The food-grade fruit toothpaste for children comprises the following raw materials, calculated by weight percentage: 10% kiwi juice, 4% kiwi peel flavonoids concentrate, 10-20% eggshell powder, 2% sucrose fatty acid ester, 0.5-1.5% thickener, 10% xylitol, 0.2% citric acid, 20-40% glycerol, 0.04% pigment, 0.5% flavor, 0.1% potassium sorbate, and the balance is water.

3. A food-grade fruit toothpaste for children according to claim 2, characterized in that: The food-grade fruit toothpaste for children comprises the following raw materials, calculated by weight percentage: 10% kiwi juice, 4% kiwi peel flavonoids concentrate, 10% eggshell powder, 2% sucrose fatty acid ester, 1.5% thickener, 10% xylitol, 0.2% citric acid, 40% glycerin, 0.04% pigment, 0.5% flavor and 0.1% potassium sorbate, the balance is water.

4. A food-grade fruit toothpaste for children according to claim 1, characterized in that: The mass ratio of the sodium carboxymethyl cellulose to the xanthan gum is 1:

1.

5. A food-grade fruit toothpaste for children according to claim 1, characterized in that: The kiwifruit in the kiwifruit juice and the kiwifruit peel flavonoids concentrate is red-heart kiwifruit.

6. A food-grade fruit toothpaste for children according to claim 5, characterized in that: The preparation process of the kiwi fruit peel flavonoid concentrate is as follows: The peel of red kiwifruit is dried, crushed, mixed with food-grade ethanol, and subjected to ultrasonication, vacuum filtration and water bath heating in sequence to obtain the kiwifruit peel flavonoid concentrate.

7. A food-grade fruit toothpaste for children according to claim 6, characterized in that: The material-liquid ratio of the crushed peel to food-grade ethanol is 1 g: 150 mL; The flavonoid content in the kiwifruit peel flavonoid concentrate is 26.87 mg / g.

8. A food-grade fruit toothpaste for children according to claim 6, characterized in that: The water bath heating condition is: heating in a water bath at 90° C. to concentrate until the solid content reaches 80%, and the kiwi fruit peel flavonoid concentrate is obtained after the concentration is completed.

9. A method for preparing food-grade fruit toothpaste for children, characterized in that: The following steps are involved: The raw materials described in any one of claims 1 to 8 are mixed evenly to form a paste, and then squeezed into a tube under vacuum conditions, and then sterilized in a water bath to obtain the food-grade fruit children's toothpaste.

10. The method for preparing a food-grade fruit toothpaste for children according to claim 9, characterized in that: The conditions for water bath sterilization are: water bath sterilization at 68° C. for 30 min.

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