Sheep milk powder and method for preparing the same

Abstract

The present application relates to goat milk powder and a preparation method thereof. The present application provides a goat milk powder, wherein the main raw materials of the goat milk powder include raw goat milk, desalted goat whey powder, concentrated goat whey protein powder and lactose; and in the goat milk powder, the total content of protein is 9.5-11.0 mass%, and the total content of carbohydrate is 46.5-59.5 mass% based on the total mass of the goat milk powder; and the proportion of whey protein in the total protein of the goat milk powder is greater than or equal to 64 mass%, and the proportion of lactose in the total carbohydrate of the goat milk powder is greater than or equal to 95 mass%; and in the goat milk powder, all the protein is of goat origin. By reasonably controlling the content of whey protein and lactose in the goat milk powder, the goat milk powder can meet the nutritional needs of infants and young children, has good flavor and appearance, has no obvious lumps, and has good reconstitution.

Description

Technical Field

[0001] This invention belongs to the field of food technology, specifically relating to goat milk powder and its preparation method, and more specifically, to an infant formula goat milk powder with excellent flavor and solubility, and its preparation method. Background Technology

[0002] Newborns experience a dramatic change in their environment after birth, while their adaptability is still developing. Newborns have high nutritional needs in the early postnatal period, but their digestive system is incomplete, their metabolic processes are immature, and their liver and kidneys have limited capacity. Proper and appropriate feeding is crucial during this stage. Breastfeeding is the ideal way to provide infants with the nutrients needed for healthy growth and development. The nutrients in breast milk are easily digested and absorbed by the body, and the nutritional and health benefits of breastfeeding can extend into adulthood. When breast milk is insufficient or unavailable, formula foods are needed to provide the nutrients required for infant growth and development. Infant formula is an important source of nutrition for infants who cannot be breastfed. The current trend in infant formula development is to modify animal milk components based on breast milk, adjusting the composition, content, and structure of nutrients, and adding various essential micronutrients to make the product's performance, composition, and nutrient content closely resemble breast milk. This involves continuous research into the composition, structure, and function of human milk.

[0003] Goat milk has a long history of consumption and includes both goat and sheep milk. The basic structure and nutritional elements of goat milk are similar to human milk, making it a good source for infant formula. However, goat milk is less stable than cow milk after heat treatment, mainly due to differences in micellar structure, mineral content, and protein interactions. During processing, the stability of goat milk proteins is easily affected, thus impacting the sensory characteristics of the finished product. However, to meet the specific protein requirements of infants, whey protein needs to be added to formula milk powder, and the stability of goat whey protein during processing is crucial for the product's reconstitution properties.

[0004] Existing technologies have addressed the above problems, for example:

[0005] Reference 1 discloses a pure goat milk protein infant formula goat milk powder and its preparation method. The main components include fresh goat milk, concentrated whey protein powder, lactose, refined vegetable oil, walnut oil, olive oil, galactooligosaccharides, fructooligosaccharides, lactoferrin, docosahexaenoic acid, eicosapentaenoic acid, bifidobacteria, complex trace elements, complex vitamins, etc. It uses a pneumatic pulse dry method to add fast-dissolving concentrated whey protein powder from goat milk, making the product easy to digest and absorb, and closer to the composition of human breast milk.

[0006] Reference 2 discloses a composition, a sheep dairy product and its preparation method, which achieves a significant deodorization effect and improves the reconstitution performance of sheep milk powder by adding a composition containing bicarbonate and citrate to sheep dairy products (e.g., sheep milk powder).

[0007] It is evident that, based on the single animal-derived protein, existing technologies for addressing the poor flavor and reconstitution properties of goat milk powder mainly involve improving the processing technology or adding additional components to the product to adjust the flavor and reconstitution performance of pure goat milk powder.

[0008] References:

[0009] Reference 1: CN103070241B;

[0010] Reference 2: CN110637886B. Summary of the Invention

[0011] The problem the invention aims to solve

[0012] Infant formula milk powder derived from pure goat milk protein has poor sensory qualities and unpleasant flavor. Furthermore, goat milk protein is unstable during processing, resulting in poor reconstitution properties of the final product. Although existing technologies offer different solutions to this problem, they are still not sufficient.

[0013] During the research process, this invention unexpectedly discovered that, without reducing the content of nutrients such as protein, the flavor and reconstitution properties of goat milk powder derived from pure goat milk protein can be improved simultaneously by rationally adjusting the content of whey protein and lactose. For example, the content of whey protein and lactose can be controlled by mixing demineralized goat whey powder and concentrated goat whey protein powder, thereby improving the stability of goat milk protein during processing and ensuring the sensory and usability of the product.

[0014] Solution for solving the problem

[0015] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0016] [1]. A goat milk powder, characterized in that the main raw materials of the goat milk powder include raw goat milk, desalted goat whey powder, concentrated goat whey protein powder and lactose, and, based on the total mass (dry weight) of the goat milk powder,

[0017] The total protein content is 9.5-11.0% by mass.

[0018] The total carbohydrate content is 46.5-59.5% by mass; and,

[0019] The whey protein content in the total protein of the goat milk powder is ≥64% by mass;

[0020] Lactose constitutes ≥95% by mass of the total carbohydrates in the goat milk powder;

[0021] Furthermore, all the proteins in the goat milk powder are of goat origin.

[0022] [2]. The goat milk powder according to [1] is characterized in that, based on the total mass (dry weight) of the goat milk powder,

[0023] The total fat content is 22.5-30.0% by mass.

[0024] [3]. The goat milk powder according to [1] or [2] is characterized in that at least a portion of the raw materials in the goat milk powder are wet-mixed and / or spray-dried.

[0025] [4]. The goat milk powder according to any one of [1] to [3] is characterized in that the protein content of the desalted goat whey powder is 10 to 20% by mass, and the protein content of the concentrated goat whey protein powder is 70 to 88% by mass.

[0026] [5]. According to the goat milk powder described in [4], the raw materials for preparing the goat milk powder include one or more of edible oils, oligosaccharides, mineral supplements, vitamin supplements and functional polyunsaturated fatty acid supplements; the edible oils include one or more vegetable oils, and the functional polyunsaturated fatty acid supplements include arachidonic acid oil powder and / or docosahexaenoic acid oil powder.

[0027] [6]. The method for preparing goat milk powder according to any one of [1] to [5] is characterized in that the method comprises the following steps:

[0028] Non-temperature-sensitive raw material component I is mixed to obtain a mixed liquid. The mixed liquid is sterilized, concentrated, and spray-dried to obtain a powdered semi-finished product. The powdered semi-finished product is then dry-mixed with temperature-sensitive component II for 1 to 3 minutes to obtain the final product.

[0029] [7]. According to the method described in [6], the raw material component I includes raw sheep milk, desalted sheep whey powder, concentrated sheep whey protein powder, lactose, oligosaccharides, vegetable oil, mineral supplements and vitamin supplements; the raw material component II includes arachidonic acid oil powder and docosahexaenoic acid oil powder.

[0030] [8]. The method according to [6] or [7] is characterized in that the sterilization temperature is 85 to 100°C and the sterilization time is greater than or equal to 6 seconds.

[0031] [9]. The method according to any one of [6] to [8] is characterized in that the exhaust temperature of the spray drying is 70-100°C.

[0032]

[10] . The method according to any one of [6] to [9] is characterized in that the method further includes a step of premixing the powdered semi-finished product with raw material component II including fat, the premixing time being 1 to 2 min.

[0033] The effects of the invention

[0034] By implementing the above technical solution, the present invention has achieved the following technical effects:

[0035] This invention provides a goat milk powder. By reasonably controlling the content of whey protein and lactose in the goat milk powder, the goat milk powder can meet the nutritional needs of infants and young children while having a good flavor and appearance. The product does not have obvious clumps during production and storage, and the goat milk powder has good reconstitution properties, with a reasonable sinking speed during reconstitution, and no obvious residue or white spots.

[0036] Meanwhile, the present invention also provides a method for preparing the above-mentioned goat milk powder, which uses a dry-wet composite process and spray drying to enable large-scale production, and has operational convenience. Attached Figure Description

[0037] Figure 1 Example 1: Product mixing properties – Observation results of residue sticking to the sides, small white spots, and clumps.

[0038] Figure 2 Example 2: Product mixing properties – Observation results of residue sticking to the sides, small white spots, and clumps.

[0039] Figure 3 Example 3: Product mixing properties – Observation results of residue sticking to the sides, small white spots, and clumps.

[0040] Figure 4 Comparative Example 1: Product mixing properties – observation results of residues, white spots, and clumps.

[0041] Figure 5 Comparative Example 2: Product mixing properties – observation results on residue sticking to the sides, white spots, and clumps.

[0042] Figure 6 Comparative Example 3: Product mixing properties – observation results on residue sticking, white spots, and clumps. Detailed Implementation

[0043] The following describes embodiments of the present invention, but the present invention is not limited thereto. The present invention is not limited to the various configurations described below, and various modifications can be made within the scope of the claims. Embodiments and examples obtained by appropriately combining the technical means disclosed in different embodiments and examples are also included in the technical scope of the present invention.

[0044] In this invention, the range of values ​​represented by “value A ~ value B” or “value A - value B” refers to the range that includes the endpoint values ​​A and B.

[0045] In this invention, the numerical range indicated by "above" or "below" refers to the numerical range that includes the stated number.

[0046] In this specification, the terms "optional" or "optional" are used to indicate the use or omission of certain substances, components, procedures, application conditions, etc.

[0047] In this invention, the word "may" has two meanings: to perform a certain process and not to perform a certain process.

[0048] In this invention, the terms "a", "an", or "the" may refer to "one", "one or more", "at least one", or "one or more".

[0049] In this invention, the terms "comprising," "having," "including," or "containing" can mean included or open-ended, and do not exclude additional, uncited elements or method steps. At the same time, "comprising," "having," "including," or "containing" can also mean closed-ended, excluding additional, uncited elements or method steps.

[0050] In this invention, the term "about" can mean that a value includes the standard deviation of the error of the apparatus or method used to determine that value. The numerical ranges and parameters used to define the present invention are approximate values, and the relevant values ​​in the specific embodiments have been presented as precisely as possible. However, any value inevitably contains a standard deviation due to the aforementioned testing apparatus or method. Therefore, unless explicitly stated otherwise, it should be understood that all ranges, quantities, values, and percentages used in this invention are modified with "about". Here, "about" generally means that the actual value is within ±2%, ±1%, or ±0.5% of a particular value or range.

[0051] In this specification, references to "some specific / preferred embodiments," "other specific / preferred embodiments," "implementation," etc., refer to specific elements (e.g., features, structures, properties, and / or characteristics) related to that embodiment, which are included in at least one of the embodiments described herein and may or may not be present in other embodiments. Furthermore, it should be understood that these elements can be combined in any suitable manner in various embodiments.

[0052] In this invention, all unit names used are international standard unit names, and unless otherwise stated, the "%" used refers to weight or mass percentage content.

[0053] In this invention, the unit of "parts by mass" or "parts by weight" can be any weight unit such as g, mg, kg or t.

[0054] In this invention, when referring to fatty acid esters, oils, mixed-structure esters, etc. as "mainly contained" or "main components", it means that the content of the corresponding component is higher than the content of other components in the system.

[0055] In this invention, the term "animal milk" is used to refer to the fluid obtained from the mammary glands of a mammal in the process of lactation. The term "animal milk" should be interpreted broadly and encompasses both raw milk (i.e., the fluid obtained directly from the mammary glands) and standardized dairy products (such as skim milk or whole milk).

[0056] In this instruction manual, unless otherwise specified, the term "whey (protein) powder" refers to sheep whey (protein) powder.

[0057] In this invention, the "desalted sheep whey powder" refers to a powdered product made from sheep whey through desalting and drying, with a protein content of not less than 10% by mass, preferably 10-20% by mass, and more preferably 11-15% by mass; in addition, the lactose content in the raw material is not less than 61% by mass, preferably not less than 70% by mass.

[0058] In this invention, the "concentrated sheep whey protein powder" refers to a powdered product with a protein content of not less than 25% by mass, made from sheep whey through processes such as separation, concentration, and drying. In some embodiments, the protein content of the "concentrated sheep whey protein powder" is 70% by mass or more, preferably 70-88% by mass, and more preferably 78-85% by mass; additionally, the lactose content in the raw material is 5-15% by mass, preferably 10-15% by mass.

[0059] In addition, unless otherwise defined, other technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0060] The technical solution of this invention is mainly based on the following insights:

[0061] The inventors of this invention discovered that various reactions occur during the heat treatment of dairy raw materials, including the denaturation and aggregation of whey proteins and the formation of complexes between whey proteins, casein, and fat globules. The complexes formed between whey proteins and casein micelles are important products of the heat treatment reaction, and the free sulfhydryl groups present in the native structure of β-lactoglobulin play a crucial role in the interaction. The complexation of β-lactoglobulin with κ-casein on the surface of casein micelles is the main reaction causing protein denaturation during heat treatment, and the degree of denaturation of α-lactalbumin also increases when β-lactoglobulin is present. Goat milk has a high κ-casein content, which is one of the main factors that makes it susceptible to denaturation during heat treatment.

[0062] Since breast milk is considered the gold standard for infant feeding, goat milk formula is often fortified with goat whey protein to make it more similar to breast milk. The stability of whey protein is crucial for the product's reconstitution properties. While existing technologies have made various attempts to improve this aspect, they primarily focus on refining production processes or adding additional materials to address related issues.

[0063] During their research, the inventors of this invention unexpectedly discovered that, without reducing the protein content, the flavor and reconstitution properties of formula goat milk powder can be improved simultaneously by rationally adjusting the content of whey protein and lactose. For example, desalted goat whey powder and concentrated goat whey protein powder can be mixed to adjust the ratio of whey protein and lactose, thereby improving the interaction between β-lactoglobulin, α-lactalbumin and κ-casein, thus reducing protein denaturation and improving product properties. In addition, although the mechanism is not yet fully understood, this process is also accompanied by a certain degree of protein glycosylation, which can simultaneously improve the sensory properties of the product.

[0064] The technical solution of the present invention will be further described below:

[0065] goat milk powder

[0066] This invention provides a goat milk powder with a single protein source, consisting entirely of goat milk protein, and possessing excellent flavor and reconstitution properties. Furthermore, this invention does not specifically limit the species of goat, such as goats or sheep, but goats are preferred.

[0067] To meet the nutritional needs of infants and young children, in some embodiments, the goat milk powder contains, by its total mass, 9.5-11.0% protein, 46.5-59.5% carbohydrates, and 22.5-30.0% fat. In some preferred embodiments, the goat milk powder contains, by its total mass, 10-11.0% protein, 46.5-49.6% carbohydrates, and 24.9-28.0% fat. In some preferred embodiments, the goat milk powder contains, by its total mass, 10.5% protein, 46.5-49.6% carbohydrates, and 24.9-28.0% fat.

[0068] Furthermore, to obtain goat milk powder with excellent flavor and reconstitution properties, the present invention adjusts the proportion of whey protein in the total protein of the goat milk powder to ≥64% by mass, preferably ≥64.3% by mass, more preferably ≥65% by mass, and even more preferably ≥66% by mass; and the proportion of lactose in the total carbohydrates of the goat milk powder to ≥95% by mass, preferably ≥95.5% by mass, more preferably ≥96% by mass, and even more preferably ≥96.5% by mass. In some preferred embodiments, the proportion of whey protein in the total protein of the goat milk powder is ≥65.3% by mass, and the proportion of lactose in the total carbohydrates of the goat milk powder is ≥95.9% by mass. In some embodiments, if the whey protein content is too low, the nutritional value will be inhibited, and at the same time, it may also lead to an increase in the ratio of lactose content to whey protein content, thereby causing problems with reconstitution properties and taste (graininess, etc.).

[0069] Furthermore, to facilitate the preparation of the goat milk powder while providing sufficient nutrition, in some embodiments, the raw materials for preparing the goat milk powder include demineralized goat whey powder and concentrated goat whey protein powder. By compounding demineralized goat whey powder and concentrated goat whey protein powder, the content of whey protein and lactose is adjusted, thereby improving the product's flavor and reconstitution properties.

[0070] In some specific embodiments, based on the total mass of the desalted sheep whey powder and concentrated sheep whey protein powder, the amount of desalted sheep whey powder is 76-96% by mass, and the amount of concentrated sheep whey protein powder is 4-24% by mass. In some preferred embodiments, based on the total mass of the desalted sheep whey powder and concentrated sheep whey protein powder, the amount of desalted sheep whey powder is 80-90% by mass, and the amount of concentrated sheep whey protein powder is 10-20% by mass. In some more preferred embodiments, based on the total mass of the desalted sheep whey powder and concentrated sheep whey protein powder, the amount of desalted sheep whey powder is 83-90% by mass, and the amount of concentrated sheep whey protein powder is 10-17% by mass.

[0071] Furthermore, in some embodiments, the raw materials for preparing the goat milk powder also include one or more of raw goat milk, lactose, edible oils, oligosaccharides, mineral supplements, vitamin supplements, and functional polyunsaturated fatty acid supplements; the edible oils include one or more vegetable oils; and the functional polyunsaturated fatty acid supplements include arachidonic acid oil powder and / or docosahexaenoic acid oil powder.

[0072] This invention does not impose any particular limitation on the specific source of the above-mentioned raw materials. For example, the raw materials can be purchased through commercial channels or prepared by methods such as biological fermentation or physical purification.

[0073] In some specific implementation schemes, the raw materials for preparing the goat milk powder include raw goat milk, desalted goat whey powder, concentrated goat whey protein powder, lactose, vegetable oil, oligosaccharides, mineral supplements, vitamin supplements, docosahexaenoic acid (DHA) oil powder, and arachidonic acid (RAA) oil powder.

[0074] In some specific implementations, the vegetable oil is selected from one or more of 1,3-dioleoyl-2-palmitoylglycerol, sunflower seed oil, soybean oil, corn oil, flaxseed oil, coconut oil, rapeseed oil, and walnut oil, or it may be a blended oil formed from multiple oils.

[0075] In some specific implementations, the oligosaccharide includes one or more of galactooligosaccharides, fructooligosaccharides, 2'-fucosylated lactose, and lactose-N-neotetrasaccharides.

[0076] In some specific embodiments, the mineral supplement is a complex mineral, comprising, by weight percentage, 0.07%–0.12% copper sulfate, 0.4%–7.6% magnesium sulfate, 1.0%–2.0% ferrous sulfate, 0.6%–1.0% zinc sulfate, 0.009%–0.013% manganese sulfate, 0.2%–0.9% potassium iodate, 0.3%–0.5% sodium selenite, 45%–86% calcium citrate, 7%–25% sodium citrate, 7%–13% potassium chloride, and 0%–38.42% lactose (carrier).

[0077] In some specific embodiments, the vitamin supplement is a multivitamin, comprising, by total mass percentage, 0.7%–1.0% retinyl acetate, 0.9%–1.3% cholecalciferol, 3.7%–6.0% dl-α-tocopherol acetate, 0.2%–0.3% phytonabinone, 0.1%–0.2% thiamine nitrate, 0.04%–0.1% riboflavin, and 0.07%–0.1% pyridoxine hydrochloride. %, cyanocobalamin 0.3%–0.4%, nicotinamide 0.5%–0.8%, folic acid 0.1%–0.3%, D-calcium pantothenate 0.5%–0.7%, sodium L-ascorbate 17%–26%, biotin 0.2%–0.4%, lutein 0.4%–1.2%, inositol 3.2%–4.2%, L-carnitine 1.4%–1.8%, choline 35%–45%, lactose 10.19%–35.69% (carrier).

[0078] In some specific implementation schemes, the arachidonic acid oil powder refers to a powder product made from arachidonic acid oil (which can be derived from alpine spores, etc., and can be obtained through bio-fermentation) as raw material, with the addition of other food ingredients and food additives, such as whey protein powder, whey powder, maltodextrin, lactose, solid corn syrup, glucose syrup, sodium octenyl succinate starch, sodium caseinate, vitamin E, ascorbate palmitate, sodium citrate, citric acid, L-ascorbate sodium, tricalcium phosphate, mono- and diglycerides of fatty acids, glyceryl monostearate, phospholipids, etc. The arachidonic acid oil powder contains a fat content of not less than 20% by mass and an arachidonic acid content of not less than 10% by mass.

[0079] In some specific implementation schemes, docosahexaenoic acid (DHA) oil powder refers to a powder product made from DHA oil (which can be derived from *Schizochytrium*, *Chrysotrophus wukeni*, *Cryptodinium commune*, tuna oil, etc., and can be obtained through bio-fermentation) as raw material, with the addition of other food ingredients and food additives, such as whey protein powder, whey powder, maltodextrin, lactose, solid corn syrup, sodium octenyl succinate starch, sodium caseinate, vitamin E, ascorbate palmitate, sodium citrate, citric acid, L-ascorbate sodium, tricalcium phosphate, mono- and diglycerides of fatty acids, glyceryl monostearate, phospholipids, etc. The fat content in the DHA oil powder is not less than 20% by mass, and the DHA content is not less than 7% by mass.

[0080] In some specific implementation schemes, the raw materials for preparing the goat milk powder, by weight, include 1200-3900 parts of raw goat milk, 150-445 parts of demineralized goat whey powder and concentrated goat whey protein powder, 75-300 parts of lactose, 120-220 parts of edible vegetable blended oil, 70-110 parts of oligosaccharides, 12-18 parts of arachidonic acid oil powder, 10-17 parts of docosahexaenoic acid oil powder, 7-25 parts of complex minerals, and 4-11 parts of complex vitamins. Specifically, based on the total mass of the demineralized goat whey powder and concentrated goat whey protein powder, the demineralized goat whey powder accounts for 76-96% by mass, and the concentrated goat whey protein powder accounts for 4-24% by mass.

[0081] In some preferred embodiments, the raw materials for preparing the goat milk powder, by weight, include 1470-1570 parts of raw goat milk, 290-387 parts of demineralized goat whey powder and concentrated goat whey protein powder, 125-225 parts of lactose, 185-220 parts of edible vegetable blended oil, 82-91 parts of oligosaccharides, 12-16 parts of arachidonic acid oil powder, 10-14 parts of docosahexaenoic acid oil powder, 14-18 parts of complex minerals, and 5-8 parts of complex vitamins. Specifically, based on the total mass of the demineralized goat whey powder and concentrated goat whey protein powder, the demineralized goat whey powder accounts for 80-90% by mass, and the concentrated goat whey protein powder accounts for 10-20% by mass.

[0082] Preparation method of goat milk powder

[0083] The method for preparing goat milk powder according to the present invention may include wet mixing and dry mixing steps.

[0084] In some specific implementations, the method includes the following steps: mixing raw material component I, which includes whey protein and lactose, to obtain a mixed liquid; sterilizing, concentrating, and spray-drying the mixed liquid to obtain a powdered semi-finished product; and dry-mixing the powdered semi-finished product with raw material component II, which includes fat, to obtain the final product.

[0085] In some specific implementations, raw material component I includes raw sheep milk, demineralized sheep whey powder, concentrated sheep whey protein powder, lactose, oligosaccharides, vegetable oil, mineral supplements, and vitamin supplements; raw material component II includes arachidonic acid oil powder and docosahexaenoic acid oil powder. Raw material component I is a non-temperature-sensitive component, while raw material component II is a temperature-sensitive component. The temperature-sensitive component may experience nutrient loss due to temperature increases during steps such as spray drying.

[0086] In some specific implementation schemes, the steps for obtaining the mixed liquid can be as follows: purifying, sterilizing, and cooling raw sheep milk; then mixing and homogenizing the sterilized raw sheep milk, demineralized sheep whey powder, concentrated sheep whey protein powder, lactose, edible vegetable oil, oligosaccharides, compound vitamins, and compound minerals in a vacuum mixing system to obtain the mixed liquid. In some implementation schemes, the sterilization temperature of the raw sheep milk is 70-90℃, and the sterilization time is ≥15s.

[0087] In some specific implementation schemes, during the preparation of the powdered semi-finished product, the sterilization method of the mixed liquid can be DSI sterilization, the sterilization temperature is 85-100℃, and the sterilization time is greater than or equal to 6s; the dry matter mass percentage of the concentrated liquid is 45%-55%; and the spray drying conditions are an exhaust temperature of 70-100℃.

[0088] In addition, in order to improve the uniformity of the dry mixing step, in some specific implementations, the powdered semi-finished product can be premixed with arachidonic acid oil powder and docosahexaenoic acid oil powder for 1 to 2 minutes, and then dry mixed for 1 to 3 minutes.

[0089] Example

[0090] The embodiments of the present invention will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified, specific conditions in the examples are performed under conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, all materials and instruments used are commercially available conventional products.

[0091] The raw materials used in all embodiments and comparative examples of this invention are shown below:

[0092] Lactose: A carbohydrate extracted from whey.

[0093] Oligosaccharides: obtained from lactose and / or sucrose through fermentation and / or purification and / or drying.

[0094] Blended vegetable oil: Edible oil made by blending two or more types of edible vegetable oils.

[0095] Complex minerals: Copper sulfate 0.1%, Magnesium sulfate 6.7%, Ferrous sulfate 1.1%, Zinc sulfate 0.9%, Manganese sulfate 0.01%, Potassium iodate 0.8%, Sodium selenite 0.4%, Calcium citrate 51%, Sodium citrate 25%, Potassium chloride 13%, Lactose 0.99% (carrier).

[0096] Multivitamin nutrients: Retinyl acetate 0.8%, Cholecalciferol 1.1%, dl-α-tocopherol acetate 5.3%, Phytonabinone 0.3%, Thiamine nitrate 0.2%, Riboflavin 0.04%, Pyridoxine hydrochloride 0.1%, Cyanocobalamin 0.4%, Nicotinamide 0.7%, Folic acid 0.2%, D-calcium pantothenate 0.6%, Sodium L-ascorbate 22.3%, Biotin 0.3%, Lutein 0.5%, Inositol 3.7%, L-carnitine 1.6%, Choline 41%, Lactose 20.86% (carrier).

[0097] Desalted sheep whey powder: A powdered product made from sheep whey through desalting and drying.

[0098] Concentrated sheep whey protein powder: A powdered product made from sheep whey through processes such as separation, concentration, and drying.

[0099] Docosahexaenoic acid (DHA) oil powder: DHA is produced by biological fermentation of *Schizochytrium schizopteris*, *Schizochytrium wokengii*, or *Cryptodinium kowti*. The product is manufactured using DHA as the main raw material through a microencapsulation process.

[0100] Arachidonic acid oil powder: This product is made by bio-fermentation of arachidonic acid oil using alpine spores, and then produced using arachidonic acid oil as the main raw material through microencapsulation technology.

[0101] Example 1

[0102] Step 1: Clean, sterilize, and cool the raw goat milk. The sterilization temperature is 80℃ and the sterilization time is 15 seconds.

[0103] Step 2: Mixing. 1470 parts of sterilized raw sheep milk, 387 parts of sheep whey (protein) powder, 125 parts of lactose, 200 parts of edible vegetable blended oil, 91 parts of oligosaccharides, 18 parts of compound minerals, and 8 parts of compound vitamin nutrients are mixed and homogenized in a vacuum mixing system to obtain a mixed liquid. The sheep whey (protein) powder is a combination of desalted sheep whey powder and concentrated sheep whey protein powder, with 90% by mass of desalted sheep whey powder and 10% by mass of concentrated sheep whey protein powder.

[0104] Step 3: The mixed liquid is sterilized by steam jet (DSI sterilization), concentrated, spray dried, cooled and then passed through a vibrating screen to obtain a powdered semi-finished product; wherein, the DSI sterilization temperature is 90℃, the sterilization time is 6s, the dry matter mass concentration percentage in the concentrated liquid is 50%, and the exhaust temperature of the spray drying is 95℃.

[0105] Step 4: Premix the powdered semi-finished product, 10 parts of docosahexaenoic acid (DHA) oil powder, and 12 parts of arachidonic acid (RAA) oil powder for 1 minute and then dry mix for 2 minutes to obtain infant formula goat milk powder.

[0106] The above-mentioned infant formula goat milk powder was subjected to sensory testing in accordance with the "Detailed Rules for Sensory Evaluation of Infant Formula Milk Powder" (RHB 204-2004).

[0107] Example 2

[0108] Step 1: Clean, sterilize, and cool the raw goat milk. The sterilization temperature is 80℃ and the sterilization time is 15 seconds.

[0109] Step 2: Mixing. 1530 parts of sterilized raw sheep milk, 342 parts of sheep whey (protein) powder, 145 parts of lactose, 220 parts of edible vegetable blended oil, 82 parts of oligosaccharides, 14 parts of compound minerals, and 5 parts of compound vitamin nutrients are mixed and homogenized in a vacuum mixing system to obtain a mixed liquid. The sheep whey (protein) powder is a combination of desalted sheep whey powder and concentrated sheep whey protein powder, with 88% by mass of desalted sheep whey powder and 12% by mass of concentrated sheep whey protein powder.

[0110] Step 3: The mixed liquid is sterilized by DSI, concentrated, spray-dried, cooled and then passed through a vibrating screen to obtain a powdered semi-finished product; wherein, the DSI sterilization temperature is 90℃, the sterilization time is 6s, the dry matter mass concentration percentage in the concentrated liquid is 50%, and the exhaust temperature of the spray drying is 95℃.

[0111] Step 4: Mix the powdered semi-finished product, 12 parts of docosahexaenoic acid (DHA) oil powder, and 14 parts of arachidonic acid (RAA) oil powder, premix for 1 minute, and dry mix for 2 minutes to obtain infant formula goat milk powder.

[0112] The above-mentioned infant formula goat milk powder was subjected to sensory testing in accordance with the "Detailed Rules for Sensory Evaluation of Infant Formula Milk Powder" (RHB 204-2004).

[0113] Example 3

[0114] Step 1: Clean, sterilize, and cool the raw goat milk. The sterilization temperature is 80℃ and the sterilization time is 15 seconds.

[0115] Step 2: Mixing. 1570 parts of sterilized raw sheep milk, 290 parts of sheep whey (protein) powder, 225 parts of lactose, 185 parts of edible vegetable blended oil, 87 parts of oligosaccharides, 16 parts of compound minerals, and 6 parts of compound vitamin nutrients are mixed and homogenized in a vacuum mixing system to obtain a mixed liquid. The sheep whey (protein) powder is a combination of desalted sheep whey powder and concentrated sheep whey protein powder, with 83% by mass of desalted sheep whey powder and 17% by mass of concentrated sheep whey protein powder.

[0116] Step 3: The mixed liquid is sterilized by DSI, concentrated, spray-dried, cooled and then passed through a vibrating screen to obtain a powdered semi-finished product; wherein, the DSI sterilization temperature is 90℃, the sterilization time is 6s, the dry matter mass concentration percentage in the concentrated liquid is 50%, and the exhaust temperature of the spray drying is 95℃.

[0117] Step 4: Premix the powdered semi-finished product, 14 parts of docosahexaenoic acid (DHA) oil powder, and 16 parts of arachidonic acid (RAA) oil powder for 1 minute and then dry mix for 2 minutes to obtain infant formula goat milk powder.

[0118] The above-mentioned infant formula goat milk powder was subjected to sensory testing in accordance with the "Detailed Rules for Sensory Evaluation of Infant Formula Milk Powder" (RHB 204-2004).

[0119] Comparative Example 1

[0120] Step 1: Clean, sterilize, and cool the raw goat milk. The sterilization temperature is 80℃ and the sterilization time is 15 seconds.

[0121] Step 2: Mixing. 1610 parts of sterilized raw sheep milk, 525 parts of desalted sheep whey powder, 185 parts of edible vegetable blended oil, 91 parts of oligosaccharides, 18 parts of compound minerals, and 8 parts of compound vitamin nutrients are mixed in a vacuum mixing system and homogenized to obtain a mixed liquid.

[0122] Step 3: The mixed liquid is sterilized by DSI, concentrated, spray-dried, cooled and then passed through a vibrating screen to obtain a powdered semi-finished product; wherein, the DSI sterilization temperature is 90℃, the sterilization time is 6s, the dry matter mass concentration percentage in the concentrated liquid is 50%, and the exhaust temperature of the spray drying is 95℃.

[0123] Step 4: The powdered semi-finished product, 14 parts of docosahexaenoic acid oil powder, and 16 parts of arachidonic acid oil powder are premixed for 1 minute, dry mixed for 2 minutes, and then dry mixed again to obtain infant formula goat milk powder.

[0124] The obtained infant formula goat milk powder was subjected to sensory testing in accordance with the "Detailed Rules for Sensory Evaluation of Infant Formula Milk Powder" (RHB 204-2004).

[0125] Comparative Example 2

[0126] Step 1: Clean, sterilize, and cool the raw goat milk. The sterilization temperature is 80℃ and the sterilization time is 15 seconds.

[0127] Step 2: Mixing. 1670 parts of sterilized raw sheep milk, 75 parts of concentrated sheep whey protein powder, 410 parts of lactose, 200 parts of edible vegetable blended oil, 91 parts of oligosaccharides, 18 parts of compound minerals, and 8 parts of compound vitamin nutrients are mixed in a vacuum mixing system and homogenized to obtain a mixed liquid.

[0128] Step 3: The mixed liquid is sterilized by DSI, concentrated, spray-dried, cooled and then passed through a vibrating screen to obtain a powdered semi-finished product; wherein, the DSI sterilization temperature is 90℃, the sterilization time is 6s, the dry matter mass concentration percentage in the concentrated liquid is 50%, and the exhaust temperature of the spray drying is 95℃.

[0129] Step 4: Premix the powdered semi-finished product, 14 parts of docosahexaenoic acid (DHA) oil powder, and 16 parts of arachidonic acid (RAA) oil powder for 1 minute and then dry mix for 2 minutes to obtain infant formula goat milk powder.

[0130] The obtained infant formula goat milk powder was subjected to sensory testing in accordance with the "Detailed Rules for Sensory Evaluation of Infant Formula Milk Powder" (RHB 204-2004).

[0131] Comparative Example 3

[0132] Step 1: Clean, sterilize, and cool the raw goat milk. The sterilization temperature is 80℃ and the sterilization time is 15 seconds.

[0133] Step 2: Mixing. 1570 parts of sterilized raw sheep milk, 200 parts of sheep whey (protein) powder, 300 parts of lactose, 200 parts of edible vegetable blended oil, 91 parts of oligosaccharides, 18 parts of compound minerals, and 8 parts of compound vitamin nutrients are mixed and homogenized in a vacuum mixing system to obtain a mixed liquid. The sheep whey (protein) powder is a combination of desalted sheep whey powder and concentrated sheep whey protein powder, with approximately 70% by mass of desalted sheep whey powder (i.e., 140 parts of desalted sheep whey powder) and approximately 30% by mass of concentrated sheep whey protein powder (i.e., 60 parts of concentrated sheep whey protein powder).

[0134] Step 3: The mixed liquid is sterilized by steam jet (DSI sterilization), concentrated, spray dried, cooled and then passed through a vibrating screen to obtain a powdered semi-finished product; wherein, the DSI sterilization temperature is 90℃, the sterilization time is 6s, the dry matter mass concentration percentage in the concentrated liquid is 50%, and the exhaust temperature of the spray drying is 95℃.

[0135] Step 4: Premix the powdered semi-finished product, 14 parts of docosahexaenoic acid (DHA) oil powder, and 16 parts of arachidonic acid (RAA) oil powder for 1 minute and then dry mix for 2 minutes to obtain infant formula goat milk powder.

[0136] The obtained infant formula goat milk powder was subjected to sensory testing in accordance with the "Detailed Rules for Sensory Evaluation of Infant Formula Milk Powder" (RHB 204-2004).

[0137] Test case

[0138] 1. Sensory evaluation

[0139] The sensory evaluation criteria are shown in Table 1 below:

[0140] Table 1 Sensory Rating Table

[0141]

[0142] The results of whey protein and lactose content detection in the finished products of the examples and comparative examples are shown in Table 2 below:

[0143] Table 2. Results of Nutritional Component Analysis

[0144]

[0145] The sensory test results of the finished products of the examples and comparative examples are shown in Table 3 below:

[0146] Table 3 Sensory Detection Results

[0147]

[0148] Note: The score is the average.

[0149] The visual results of the products in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, and Comparative Example 3 regarding residue adhesion, white spots, and clumps in reconstitution are as follows: Figures 1-6 As shown in the figure. A comparison reveals that the product in this embodiment is superior to the comparative example in terms of residue sticking to the sides, white spots, and clumps during reconstitution.

[0150] Further analysis of Tables 2 and 3 shows that when the content of whey protein and lactose is reasonably controlled at the same time, the resulting product will have better characteristics in terms of flavor, appearance and reconstitution, and be more usable.

[0151] Industrial availability

[0152] The goat milk powder and its preparation method provided by this invention can be widely used in industry.

Claims

1. A goat milk powder, characterized in that, By weight, the raw materials of the goat milk powder include 1470-1570 parts of raw goat milk, 290-387 parts of demineralized goat whey powder and concentrated goat whey protein powder, 125-225 parts of lactose, 185-220 parts of edible vegetable blended oil, 82-91 parts of oligosaccharides, 12-16 parts of arachidonic acid oil powder, 10-14 parts of docosahexaenoic acid oil powder, 14-18 parts of complex minerals, and 5-8 parts of complex vitamins; and, by total mass of the goat milk powder, The total protein content is 9.5-11.0% by mass. The total carbohydrate content is 46.5-59.5% by mass. and, Whey protein accounts for ≥64% of the total protein in the goat milk powder; Lactose constitutes ≥95% by mass of the total carbohydrates in the goat milk powder. Furthermore, all the protein in the goat milk powder is of goat origin; Furthermore, in the goat milk powder, based on the total mass of the desalted goat whey powder and the concentrated goat whey protein powder, the amount of the desalted goat whey powder is 80-90% by mass, and the amount of the concentrated goat whey protein powder is 10-20% by mass. At least some of the ingredients in goat milk powder are wet-mixed and spray-dried.

2. The goat milk powder according to claim 1, characterized in that, In the goat milk powder, based on the total mass of the goat milk powder, The total fat content is 22.5-30.0% by mass.

3. The goat milk powder according to claim 1 or 2, characterized in that, The protein content of the desalted sheep whey powder is 10-20% by mass, and the protein content of the concentrated sheep whey protein powder is 70-88% by mass.

4. The method for preparing goat milk powder according to any one of claims 1 to 3, characterized in that, The method includes the following steps: Non-temperature-sensitive raw material component I is mixed to obtain a mixed liquid. The mixed liquid is sterilized, concentrated, and spray-dried to obtain a powdered semi-finished product. The powdered semi-finished product is then dry-mixed with temperature-sensitive raw material component II for 1-3 minutes to obtain the final product. The non-temperature-sensitive raw material component I includes raw sheep milk, desalted sheep whey powder, concentrated sheep whey protein powder, lactose, oligosaccharides, edible vegetable blended oil, compound minerals, and compound vitamins; the temperature-sensitive raw material component II includes arachidonic acid oil powder and docosahexaenoic acid oil powder.

5. The method according to claim 4, characterized in that, The sterilization temperature is 85~100℃, and the sterilization time is greater than or equal to 6s.

6. The method according to claim 4, characterized in that, The exhaust temperature of the spray dryer is 70-100℃.

7. The method according to claim 4, characterized in that, The method further includes a step of premixing the powdered semi-finished product with temperature-sensitive raw material component II, which includes fat, for a premixing time of 1-2 minutes.

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