Milk powder for improving height development of children and preparation method thereof

Abstract

The invention provides milk powder capable of improving height development of children and a preparation method of the milk powder. Soybeans are subjected to impurity removal, peeling and crushing, water with the weight being 1 time that of the soybeans is added, the mixture is uniformly stirred and then put into an extruder, heating is performed at 180 DEG C for 5 seconds, the high-pressure extrusion pressure is 10-15 MPa, pretreated materials are cooled and then subjected to secondary crushing, the crushed raw materials are put into an extraction tank according to the ratio of 1: 8, water is put into the extraction tank for secondary extraction separation, and the milk powder is obtained. Adding an alkali solution to adjust the pH value to 8.5-9.0, and stirring at the water temperature of 30-40 DEG C; water containing protein is put into an acid precipitation tank for two-step acid precipitation separation, and the PH is neutralized and adjusted to 6.5-7.5; after sterilizing and drying, crushing the dried soybean protein isolate to obtain more than 90% of micro powder of which the particle size does not exceed 50 microns; and uniformly mixing the obtained milk powder, soybean protein micro powder, docosahexaenoic acid fish oil powder, arachidonic acid grease and compound probiotic powder to finally obtain the infant formula milk powder. The milk powder obtained by the method is quick to dissolve, easy to absorb, free of peculiar smell and suitable for improving height development of children.

Description

Technical Field

[0001] The invention relates to the field of dairy product processing, and more particularly to milk powder for improving children's height development and a preparation method thereof. Background Art

[0002] Children's bones grow and develop rapidly, mainly in bone construction, with accelerated bone turnover and a dominant bone formation, so bone mass can grow steadily, and 90% of the peak bone mass has been accumulated by the age of 18. The minerals most closely related to bone growth are calcium and phosphorus. The absorption and utilization of calcium mainly through vitamin D and ultraviolet radiation in sunlight can play its role. At the same time, children's diet should increase vitamin C intake to promote iron absorption, which is beneficial to the growth of children during their growth period. Therefore, most of the children's milk powder on the market promotes bone growth and development by adding vitamin D. The calcium and other nutrients in milk powder are generally sufficient, but it only considers the effect of bone absorption of calcium from a unilateral perspective, and cannot achieve the ideal effect of promoting children's bone development. With the continuous improvement of people's living standards, children's diets have become extremely rich, but there are still many children with unsatisfactory heights, which shows that there are other factors affecting children's height besides calcium. If calcium is simply supplemented in large quantities, it is easy to form deposits, which will irritate the stomach, affect children's spleen and stomach digestion, and form a nausea cycle.

[0003] Soy protein contains essential amino acids, including eight essential amino acids that cannot be synthesized by the human body. This substance can promote the secretion of growth hormone and the absorption of calcium. Soy protein is also rich in vitamins, minerals, trace elements and other nutrients. The protein content is 12 times that of milk, which can provide strong support for children's growth. However, soy protein contains substances such as soy isoflavones, which make protein powder have a certain fishy smell, which has a certain rejection reaction for children. Moreover, as an organic macromolecular compound, protein exists in a dispersed state in water and has poor solubility. When mixed with milk powder, it affects the mixing effect of milk powder.

[0004] It can be seen from this that it is necessary to find a formula milk powder suitable for children that dissolves quickly, is easily absorbed, and has no odor, while also effectively helping children's bone development and meeting children's height development needs. Summary of the invention

[0005] The present application aims at the deficiencies existing in the prior art, and the purpose of the present invention is to provide a method for preparing milk powder which has stable quality, reasonable formula, rapid dissolution, easy absorption by the body and no peculiar smell.

[0006] The purpose of the present invention is mainly achieved through the following technical solutions: A method for preparing milk powder for improving children's height development, characterized in that: S1: Soybean is used as raw material. After being removed from impurities, peeled and crushed, 1 times the weight of water is added to the soybean and stirred evenly. The soybean is then put into an extruder and heated at 180°C for 5 seconds. The high-pressure extrusion pressure is 10-15MPa to obtain a pre-treated material. S2: After cooling the pretreated material, the material is crushed twice to 20-30 μm, and the crushed material is placed in an extraction tank with a ratio of 1:8 water for secondary extraction and separation, and an alkaline solution is added to adjust the pH value to 8.5-9.0, and the water temperature is 30-40°C and stirred to obtain water containing protein; S3: placing the protein-containing water into an acid precipitation tank, adding acid, adjusting the pH of the protein-containing water in the acid precipitation tank to 4.5-5; stirring for 1-3 hours, continuing to add acid to adjust the pH to 4.4-4.6, slowly stirring for 2-4 hours, the slow stirring is 6-8 rpm, sending the mixed solution after acid precipitation into a separator for separation, adding alkaline solution, neutralizing and adjusting the pH to 6.5-7.5; S4: After sterilization and drying, the dried soy protein isolate is crushed and the product is crushed with an ultrafine grinder to obtain a micro powder with a particle size of more than 90% not exceeding 50 microns; S5: mixing whey protein powder, fresh milk, fructo-oligosaccharide, galacto-oligosaccharide, milk mineral salt, complex trace elements and complex vitamins to obtain a mixed liquid; S6: homogenizing, high-pressure homogenizing, sterilizing, concentrating, and spray drying the obtained mixed liquid to obtain milk powder; S7: Evenly mix the obtained milk powder, soybean protein powder, docosahexaenoic acid fish oil powder, arachidonic acid oil and compound probiotic powder to finally obtain infant formula milk powder.

[0007] As a further preferred embodiment, in the above step S6, the mass ratio of soy protein powder, whey protein powder, fresh milk, fructo-oligosaccharides, galacto-oligosaccharides, milk mineral salts, complex trace elements, complex vitamins, docosahexaenoic acid, and arachidonic acid is (50-70): (30-40): (180-200): (4.2-5): (2-2.5): (4.2-5): (0.6-1.2): (0.4-0.5): (0.2-0.8): (0.3-1.0).

[0008] As a further preferred embodiment, in the above step S2, the stirring rate is 500-1000 rpm (minutes), and the stirring time is 60-120 min.

[0009] As a further preferred embodiment, the acid in the above step S3 is hydrochloric acid with a pH value of 3 to 5.

[0010] As a further preferred embodiment, the low-temperature ultrafine grinding in the above step S4 is to repeatedly grind the material into ultrafine powder by adopting a low-temperature high-frequency vibration mill ultrafine grinding method at 30 to 40°C.

[0011] As a further preferred embodiment, the mixing temperature in the above step S5 is 40° C. to 50° C., and the mixing time is 10 min to 15 min.

[0012] As a further preferred embodiment, the composite probiotic powder in step S7 is composed of animal Bifidobacterium Bb-12, Bifidobacterium lactis HN019 and Bifidobacterium lactis Bi-07 in any proportion; The content of the composite probiotics in the infant formula milk powder is 1×107-6×107 cfu / g.

[0013] As a further preferred embodiment, in the step S7, the mixing temperature is 20° C. to 30° C., and the mixing humidity is 40% to 50%.

[0014] The beneficial effects of the present invention are: 1. The milk powder prepared by the method of the present invention is added with soybean protein, which can effectively improve the body's immunity and help bone development. Soybeans also contain soluble fiber, which can effectively promote gastrointestinal motility and improve the digestion and absorption functions, thereby ensuring that nutrients are absorbed more comprehensively, and playing an unexpected positive role in children's bone development. The present invention focuses on solving the technical problems generated in the introduction of soybean protein, wherein the content of substances such as trypsin inhibitors in soybeans is about 2%, which can hinder the action of proteolytic enzymes in the intestines and reduce the protein digestibility, produce peculiar smell and cause nausea. The present invention uses high-pressure extrusion technology in the raw material processing stage, so that substances such as trypsin inhibitors in soybeans are denatured and removed during crushing, thereby achieving the effect of removing the fishy smell and swelling of the product.

[0015] 2. The present invention adopts secondary extraction and two-step acid precipitation method, and its protein content can reach more than 90%. When the H value of the soybean raw powder extract reaches 4.3-4.5, the protein solubility is the lowest. The insoluble protein and polysaccharide are separated from the soluble carbohydrates and low molecular weight protein by centrifugation, and then neutralized and concentrated and dried and dehydrated. The obtained protein powder has good water solubility and further shortens the dissolution time. In addition, this method can also remove the fishy smell of soybeans at the same time.

[0016] 3. The product in this application is beneficial to improving the height development of children. It uses the essential amino acids contained in soy protein to promote the secretion of growth hormone and the absorption of calcium, and promotes the growth and development of children's bones from a new perspective. It solves the odor problem of soy protein products and further improves the extraction rate and solubility rate of soy protein. From a scientific perspective, it can fully improve the practical application of soy protein in formula milk powder. DETAILED DESCRIPTION

[0017] The present invention discloses a method for preparing an easily absorbable soy protein powder. Those skilled in the art can refer to the content of the present invention and appropriately improve the prescription ratio and process parameters to achieve the same. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included within the scope of the present invention. The application of the present invention has been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the methods and applications described herein without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.

[0018] The present invention is further described below by way of examples, but the examples do not limit the present invention in any way.

[0019] The experimental methods in the following examples are conventional methods unless otherwise specified, and the raw materials, reagents, etc. used in the following examples are commercially available products unless otherwise specified. Example 1

[0020] A method for preparing milk powder for improving children's height development, characterized in that: S1: Soybean is used as raw material. After being removed from impurities, peeled and crushed, 1 times the weight of water is added to the soybean and stirred evenly. The soybean is then put into an extruder and heated at 180°C for 5 seconds. The high-pressure extrusion pressure is 10-15MPa to obtain a pre-treated material. S2: After cooling the pretreated material, the material is crushed twice to 20-30 μm, and the crushed material is placed in an extraction tank with a ratio of 1:8 water for secondary extraction and separation, and an alkaline solution is added to adjust the pH value to 8.5-9.0, and the water temperature is 30-40°C and stirred to obtain water containing protein; S3: placing the protein-containing water into an acid precipitation tank, adding acid, adjusting the pH of the protein-containing water in the acid precipitation tank to 4.5-5; stirring for 1-3 hours, continuing to add acid to adjust the pH to 4.4-4.6, slowly stirring for 2-4 hours, the slow stirring is 6-8 rpm, sending the mixed solution after acid precipitation into a separator for separation, adding alkaline solution, neutralizing and adjusting the pH to 6.5-7.5; S4: After sterilization and drying, the dried soy protein isolate is crushed and the product is crushed with an ultrafine grinder to obtain a micro powder with a particle size of more than 90% not exceeding 50 microns; S5: mixing whey protein powder, fresh milk, fructo-oligosaccharide, galacto-oligosaccharide, milk mineral salt, complex trace elements and complex vitamins to obtain a mixed liquid; S6: homogenizing, high-pressure homogenizing, sterilizing, concentrating, and spray drying the obtained mixed liquid to obtain milk powder; S7: Evenly mix the obtained milk powder, soybean protein powder, docosahexaenoic acid fish oil powder, arachidonic acid oil and compound probiotic powder to finally obtain infant formula milk powder. Example 2

[0021] A method for preparing milk powder for improving children's height development, characterized in that: S1: Soybean is used as raw material. After being removed from impurities, peeled and crushed, 1 times the weight of water is added to the soybean and stirred evenly. The soybean is then put into an extruder and heated at 180°C for 5 seconds. The high-pressure extrusion pressure is 10-15MPa to obtain a pre-treated material. S2: After cooling the pretreated material, the material is crushed twice to 20-30 μm, and the crushed material is placed in an extraction tank with a ratio of 1:8 water for secondary extraction and separation, and an alkaline solution is added to adjust the pH value to 8.5-9.0, and the water temperature is 30-40°C and stirred to obtain water containing protein; S3: The water containing protein is placed in an acid precipitation tank, acid is added, the pH of the water containing protein in the acid precipitation tank is adjusted to 4-4.5, and stirred for 2-3 hours. The mixed solution after acid precipitation is sent to a separator for separation, and an alkaline solution is added to neutralize and adjust the pH to 6.5-7.5; S4: After sterilization and drying, the dried soy protein isolate is crushed and the product is crushed with an ultrafine grinder to obtain a micro powder with a particle size of more than 90% not exceeding 50 microns; S5: mixing whey protein powder, fresh milk, fructo-oligosaccharide, galacto-oligosaccharide, milk mineral salt, complex trace elements and complex vitamins to obtain a mixed liquid; S6: homogenizing, high-pressure homogenizing, sterilizing, concentrating, and spray drying the obtained mixed liquid to obtain milk powder; S7: Evenly mix the obtained milk powder, soybean protein powder, docosahexaenoic acid fish oil powder, arachidonic acid oil and compound probiotic powder to finally obtain infant formula milk powder.

[0022] The two-step acid precipitation method was not used in this example. Example 3

[0023] A method for preparing milk powder for improving children's height development, characterized in that: S1: Soybeans are used as raw materials. The soybeans are removed from impurities, peeled and crushed to 20-30 μm. The crushed raw materials are placed in an extraction tank with a ratio of 1:8 water for secondary extraction and separation. Alkaline solution is added to adjust the pH value to 8.5-9.0. The water temperature is 30-40°C and stirred to obtain water containing protein; S2: placing the protein-containing water into an acid precipitation tank, adding acid, adjusting the pH of the protein-containing water in the acid precipitation tank to 4.5-5; stirring for 1-3 hours, continuing to add acid to adjust the pH to 4.4-4.6, slowly stirring for 2-4 hours, the slow stirring is 6-8 rpm, sending the mixed solution after acid precipitation into a separator for separation, adding alkaline solution, neutralizing and adjusting the pH to 6.5-7.5; S3: After sterilization and drying, the dried soy protein isolate is crushed and the product is pulverized to obtain more than 90% of the powder with a particle size not exceeding 400 microns using an ultra-fine pulverizer; S4: mixing whey protein powder, fresh milk, oligofructose, oligogalactose, milk mineral salts, complex trace elements and complex vitamins to obtain a mixed liquid; S5: homogenizing, high-pressure homogenizing, sterilizing, concentrating, and spray drying the obtained mixed liquid to obtain milk powder; S6: Evenly mix the obtained milk powder, soybean protein powder, docosahexaenoic acid fish oil powder, arachidonic acid oil and compound probiotic powder to finally obtain infant formula milk powder.

[0024] This embodiment is the same as the embodiment 1, except that the soybeans are directly crushed to 35 μm after pretreatment, and the protein is crushed using an ultra-fine grinder, but only 400 μm of fine powder can be obtained. Example 4

[0025] A method for preparing milk powder for improving children's height development, characterized in that: S1: Soybean is used as raw material. After being removed from impurities, peeled and crushed, 1 times the weight of water is added to the soybean and stirred evenly. The soybean is then put into an extruder and heated at 180°C for 5 seconds. The high-pressure extrusion pressure is 10-15MPa to obtain a pre-treated material. S2: After cooling the pretreated material, the material is crushed twice to 20-30 μm, and the crushed material is placed in an extraction tank with a ratio of 1:8 water for extraction and separation, and an alkaline solution is added to adjust the pH value to 8.5-9.0, and the water temperature is 30-40°C and stirred to obtain water containing protein; S3: placing the protein-containing water into an acid precipitation tank, adding acid, adjusting the pH of the protein-containing water in the acid precipitation tank to 4.5-5; stirring for 1-3 hours, continuing to add acid to adjust the pH to 4.4-4.6, slowly stirring for 2-4 hours, the slow stirring is 6-8 rpm, sending the mixed solution after acid precipitation into a separator for separation, adding alkaline solution, neutralizing and adjusting the pH to 6.5-7.5; S4: After sterilization and drying, the dried soy protein isolate is crushed and the product is crushed with an ultrafine grinder to obtain a micro powder with a particle size of more than 90% not exceeding 400 microns; S5: mixing whey protein powder, fresh milk, fructo-oligosaccharide, galacto-oligosaccharide, milk mineral salt, complex trace elements and complex vitamins to obtain a mixed liquid; S6: homogenizing, high-pressure homogenizing, sterilizing, concentrating, and spray drying the obtained mixed liquid to obtain milk powder; S7: Evenly mix the obtained milk powder, soybean protein powder, docosahexaenoic acid fish oil powder and arachidonic acid oil to finally obtain infant formula milk powder.

[0026] In this embodiment, no composite probiotic powder was added. Example 5

[0027] S1: mixing whey protein powder, fresh milk, oligofructose, oligogalactose, milk mineral salts, complex trace elements and complex vitamins to obtain a mixed liquid; S2: homogenizing, high-pressure homogenizing, sterilizing, concentrating, and spray drying the obtained mixed liquid to obtain milk powder; S3: uniformly mixing the obtained milk powder, docosahexaenoic acid fish oil powder, arachidonic acid oil and compound probiotic powder to finally obtain infant formula milk powder; The difference from Example 1 is that the soybean protein powder is removed, and the other components and steps remain unchanged. Effect example

[0028] The above-mentioned embodiments 1 to 5 were tested for performance indicators, mainly including: soy protein purity, smell detection of formula milk powder, and absorption rate and stratification time detection of formula milk powder.

[0029] The purity of soy protein uses the commonly used purity test data in the laboratory. In the smell test of formula milk powder, 50 volunteers were selected and divided into 5 groups. The smell test was conducted manually, and multiple "+"s were used to indicate the smell, and "-" was used to indicate no smell. The specific results are shown in Table 1.

[0030] Table 1 Product performance

[0031] As can be seen from Table 1 above, the formula milk powder of the present invention can greatly improve the dissolution time of the product, can improve the effective absorption of products, especially high-quality proteins and other substances, and in product performance, smell is also very important. If the peculiar smell of soy protein powder is removed, the promotion and use of the product can be effectively improved. At the same time, the micronization step significantly affects the solubility of soy protein powder. The high-pressure extrusion in S1 has a large promoting effect on micronization. The micronization step significantly affects the solubility of soy protein powder. When the particle size range becomes larger, the solubility of soy protein powder deteriorates, the dispersion time is long, and the stratification is fast, which does not reach the effect of instant and stable dissolution.

[0032] To sum up, although soy protein can effectively improve one's own immunity, help bone development, improve digestion and absorption functions, thereby ensuring more comprehensive nutrient absorption, and play an unexpectedly positive role in children's bone development, it still encounters technical problems such as low solubility and odor in practical applications. The infant formula milk powder produced by this formula and corresponding process can solve the above technical problems. The soy protein powder in the embodiment of the present invention contains rich amino acids, calcium and vitamins, and the purity and solubility are greatly improved, which can enhance protein absorption, supplement calcium and promote height, improve bone strength, promote children's bone growth, promote the production of bone growth factors, and effectively promote bone growth and development.

[0033] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, but are not limited thereto. Those skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A method for preparing milk powder for improving children's height development, characterized in that: The following steps are involved: S1: Soybean is used as raw material. After being removed from impurities, peeled and crushed, 1 times the weight of water is added to the soybean and stirred evenly. The soybean is then put into an extruder and heated at 180°C for 5 seconds. The high-pressure extrusion pressure is 10-15MPa to obtain a pre-treated material. S2: After cooling the pretreated material, the material is crushed twice to 20-30 μm, and the crushed material is placed in an extraction tank with a ratio of 1:8 water for secondary extraction and separation, and an alkaline solution is added to adjust the pH value to 8.5-9.0, and the water temperature is 30-40°C and stirred to obtain water containing protein; S3: placing the protein-containing water into an acid precipitation tank, adding acid, adjusting the pH of the protein-containing water in the acid precipitation tank to 4.5-5; stirring for 1-3 hours, continuing to add acid to adjust the pH to 4.4-4.6, slowly stirring for 2-4 hours, the slow stirring is 6-8 rpm, sending the mixed solution after acid precipitation into a separator for separation, adding alkaline solution, neutralizing and adjusting the pH to 6.5-7.5; S4: After sterilization and drying, the dried soy protein isolate is crushed and the product is crushed with an ultrafine grinder to obtain a micro powder with a particle size of more than 90% not exceeding 50 microns; S5: mixing whey protein powder, fresh milk, fructo-oligosaccharide, galacto-oligosaccharide, milk mineral salt, complex trace elements and complex vitamins to obtain a mixed liquid; S6: homogenizing, high-pressure homogenizing, sterilizing, concentrating, and spray drying the obtained mixed liquid to obtain milk powder; S7: Evenly mix the obtained milk powder, soybean protein powder, docosahexaenoic acid fish oil powder, arachidonic acid oil and compound probiotic powder to finally obtain infant formula milk powder.

2. The preparation method according to claim 1, characterized in that: The mass ratios of soy protein powder, whey protein powder, fresh milk, fructooligosaccharides, galacto-oligosaccharides, milk mineral salts, complex trace elements, complex vitamins, docosahexaenoic acid and arachidonic acid are (50-70): (30-40): (180-200): (4.2-5): (2-2.5): (4.2-5): (0.6-1.2): (0.4-0.5): (0.2-0.8): (0.3-1.0).

3. The preparation method according to claim 1, characterized in that: In step S2, the stirring rate is 500-1000 rpm (minutes), and the stirring time is 60-120 min.

4. The preparation method according to claim 1, characterized in that: The acid described in step S3 is hydrochloric acid with a pH value of 3 to 5.

5. The preparation method according to claim 1, characterized in that: The low-temperature ultrafine grinding in step S4 is to repeatedly grind the material into ultrafine powder by using a low-temperature high-frequency vibration mill ultrafine grinding method at -30 to -40°C.

6. The preparation method according to claim 1, characterized in that: The mixing temperature in step S5 is 40° C. to 50° C.; the mixing time is 10 min to 15 min.

7. The preparation method according to claim 1, characterized in that: Step S7: the composite probiotic powder is composed of animal Bifidobacterium Bb-12, Bifidobacterium lactis HN019 and Bifidobacterium lactis Bi-07 in any proportion; The content of the composite probiotics in the infant formula milk powder is 1×107-6×107 cfu / g.

8. The preparation method according to claim 1, characterized in that: The mixing temperature in step S7 is 20° C. to 30° C., and the mixing humidity is 40% to 50%.

9. A milk powder for improving children's height development, characterized in that: The compound is prepared by the preparation method according to any one of claims 1 to 8.

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