CN112823645A - Dairy product and preparation method thereof - Google Patents

Dairy product and preparation method thereof Download PDF

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Publication number
CN112823645A
CN112823645A CN201911142499.9A CN201911142499A CN112823645A CN 112823645 A CN112823645 A CN 112823645A CN 201911142499 A CN201911142499 A CN 201911142499A CN 112823645 A CN112823645 A CN 112823645A
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collagen
dairy product
raw milk
milk
protein
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贾少婷
钱文涛
王美华
杜新
李文静
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Inner Mongolia Mengniu Dairy Group Co Ltd
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Inner Mongolia Mengniu Dairy Group Co Ltd
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    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23CDAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING THEREOF
    • A23C9/00Milk preparations; Milk powder or milk powder preparations
    • A23C9/152Milk preparations; Milk powder or milk powder preparations containing additives
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23CDAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING THEREOF
    • A23C9/00Milk preparations; Milk powder or milk powder preparations
    • A23C9/152Milk preparations; Milk powder or milk powder preparations containing additives
    • A23C9/1526Amino acids; Peptides; Protein hydrolysates; Nucleic acids; Derivatives thereof

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Molecular Biology (AREA)
  • Proteomics, Peptides & Aminoacids (AREA)
  • Dairy Products (AREA)

Abstract

The invention discloses a dairy product and a preparation method thereof. The dairy product comprises the following raw materials: raw milk and collagen, wherein the mass ratio of the collagen to the total protein in the raw milk is not less than 6: and 5, by controlling the mass ratio of the collagen to the total protein in the raw milk, a synergistic effect can be generated, so that the collagen, the whey protein and the casein in the raw milk are combined to form a spatial and three-dimensional reticular structure, and the structure has higher toughness and firmness than a simple linear structure, so that the functional characteristics of the collagen are enhanced and are durable. The preparation method adopts staged dissolution, and improves coloring efficiency of red yeast rice, thereby maintaining color durability and improving brightness; the product ensures a high protein system composed of milk whey protein, casein and collagen and a system of red yeast rice reaching dynamic stability, and improves the stability of the whole system.

Description

Dairy product and preparation method thereof
Technical Field
The invention belongs to the technical field of dairy product preparation, and particularly relates to a dairy product and a preparation method thereof.
Background
The modified milk is a liquid product prepared by taking not less than 80% of raw milk and the like as main raw materials, adding other raw materials or food additives or nutrition enhancers and adopting proper processes of sterilization, disinfection and the like.
Collagen is the most abundant protein in the human body. The aging process of human body is the process of collagen loss. The collagen can be supplemented for caring skin and strengthening bone. However, most products combining collagen with modified milk in the market cannot really exert the effect due to unreasonable aspects such as raw material selection, formula design and process.
Disclosure of Invention
The invention aims to solve the technical problem of how to provide a high-protein dairy product with collagen capable of exerting functional characteristics and a preparation method thereof.
Therefore, the dairy product provided by the invention comprises the following raw materials: raw milk and collagen, wherein the mass ratio of the collagen to the total protein in the raw milk is not less than 6: 5.
further, the mass ratio of the collagen to the total protein in the raw milk is (6-8): 5.
further, the protein content in the milk product is not less than 6 wt%.
Further, the protein content in the dairy product is not less than 6-8 wt%.
Further, the feed comprises the following raw materials in parts by weight:
Figure BDA0002281326690000011
Figure BDA0002281326690000021
further, the feed also comprises the following raw materials in parts by weight:
0.4-3 parts of cream
0.2-2 parts of yolk powder
0.5-3.5 parts of starch.
Further, the sugar is at least one of white granulated sugar, high fructose corn syrup and maltose;
the stabilizer is at least one of monoglyceride, sucrose ester, carrageenan, xanthan gum and locust bean gum;
the cream is anhydrous cream and/or dilute cream.
Further, the collagen comprises at least one of bovine collagen, porcine collagen, deep-sea fish collagen and diving fish collagen; for example, the collagen is at least one of collagen derived from pig skin, collagen derived from cow hide, collagen derived from cow bone, collagen derived from cow tendon, collagen derived from fish phosphorus, and collagen derived from fish skin. Preferably, the collagen is collagen derived from diving fish. Because of the following advantages: 1. the source is safe, and the worry of foot-and-mouth disease and mad cow disease does not exist; fresh fish skin is adopted, local materials are used in a nearby farm, and the maximum freshness and activity are kept to be fresher; 2. the purity is high, no hormone or antibiotic is contained, and the activity is strong; 3. the fish skin is fresh, the maximum freshness and taste are reserved, substances such as heavy metal and the like are not contained, and any peculiar smell is not doped; 4. the collagen peptide plays a role in deed, and fully ensures the content of natural bioactive collagen peptide as much as possible, thereby playing the functional activity.
The collagen provided by the invention can provide functional properties. Is determined by the following aspects. Firstly, a process for extracting collagen. The collagen hydrolysis effect is exerted by collagen peptides. The ineffectiveness of the collagen is that the raw materials are infinitely and qualitatively hydrolyzed at will, and the collagen obtained by the method is decomposed into amino acids by the stomach after being eaten to play a role in supplementing nutrition and cannot play the efficacy of the collagen. The collagen provided by the invention is effective collagen. The process comprises the following steps: performing primary extraction on a fish skin raw material 1, soaking the fish skin raw material by using citric acid and acetic acid solution, soaking the fish skin raw material by using 0.5-1% of sodium hydroxide solution, and eluting the fish skin raw material by using deionized water to remove acid-base solution to obtain a primary product gelatin; 2. secondary extraction: putting the primary product gelatin into an enzymolysis reaction tank, and reacting for 2 hours at 50 ℃ under the condition that the pH value is 6 by adopting papain; 3. enzyme deactivation treatment, namely keeping the temperature at 90 ℃ for 30 min; 4. and 5, carrying out spray drying, namely, entering a spray tower for spray drying to obtain the collagen peptide. The collagen provided by the invention is sheared into collagen peptide on a limited polypeptide chain, has good taste and does not have fishy smell and peculiar smell. After eating, the collagen peptide is decomposed in vivo into a plurality of functional dipeptide fragments containing hydroxy-proline, and the fragments are collagen peptide with the relative molecular weight less than 10000. Such as: hydroxyproline-proline, hydroxyproline-glycine mixtures. These functional dipeptide fragments act as "signal" for cells and promote the proliferation of fibroblasts, which are the site for the production of collagen, hyaluronic acid, and the like in vivo. Therefore, these dipeptides finally promote fibroblasts to produce more collagen and hyaluronic acid into blood, and then activate fibroblasts to produce collagen and hyaluronic acid, thereby supplementing collagen content required by organs such as body skin, hair, bone, cartilage, and the like. This process is referred to as a unique two-stage process. And secondly, contains 18 different amino acids and contains 8 essential amino acids of 9 required by human body. Respectively as follows: isoleucine, leucine, lysine, methionine, phenylalanine, threonine, valine, and histidine. In addition, the protein contains hydroxylysine and hydroxyproline, which are the collagen marker amino acids that milk and other proteins do not contain. The amino acid supplements the nutrition of the human body, participates in the life activities of the human body and plays a role in supplementing the nutrition. Thirdly, the structure of collagen. Collagen is fibrous protein with three peptide chains twisted into a spiral shape, is the most abundant protein in human bodies, and accounts for 20-40% of the total protein of the human bodies and is the main component of connective tissues such as skin, hair, bones, cartilage, tendons, vessel walls and the like. Fourth, the synergistic effect of collagen with whey protein and casein. The collagen is a fibrous linear structure, and the casein micelle is a rough spherical structure. Cross-links are formed with the whey protein molecules. The fibrous linear structure of the collagen is wound outside the spherical structure of the casein. This combination forms a spatial three-dimensional network. This structure is more flexible and stronger than a simple linear structure. So that the functional properties of collagen are not only enhanced but also sustained. The mass ratio of the collagen to the total protein in the raw milk is not less than 6:5, so that a synergistic effect can be generated, and a spatial and three-dimensional reticular structure is formed. When the ratio is less than 6:5, a spatial network structure cannot be formed, the collagen has a significantly weaker functionality than the former, and the time required for the collagen to act is significantly shorter than the former.
In the present invention, the proteins in raw milk are generally whey protein and casein; the red yeast rice is brownish red or purple red rice grains generated by fermentation of monascus, and is combined with the prepared milk to endow the product with natural pink to form the red yeast rice prepared milk.
In addition, the invention also provides a preparation method of the dairy product, which comprises the following steps:
dissolving collagen and starch in part of raw milk, hydrating, adding sugar, stabilizer and yolk powder, and mixing to obtain first feed liquid;
adding cream and red yeast rice into the rest raw milk, and performing second mixing to obtain a second feed liquid;
and mixing the first feed liquid and the second feed liquid, and then sequentially carrying out constant volume, homogenization and sterilization to prepare the dairy product.
Further, the hydration is to stir the mixture of the collagen, the starch and part of the raw milk for 10 to 20min at the stirring speed of 4000-;
before adding sugar, stabilizer and yolk powder, heating the hydrated mixture to 40-45 ℃;
the stirring speed of the first mixing is 4000-.
Further, before adding the cream and the red yeast rice into the rest raw milk, heating the rest raw milk to 40-45 ℃;
the stirring speed of the second mixing is 6000-.
Further, the homogenizing temperature is 60-70 ℃, the pressure is 180-220bar, and the secondary pressure is 30-40 bar;
the sterilization temperature is 130-140 ℃, and the time is 4-6 s.
Further, the mass ratio of the partial raw milk to the residual raw milk is (600- > 650): (200-300).
In the invention, the dairy product can be specifically red yeast rice modified milk containing functional components. The milk product adopts raw milk, collagen and red yeast rice as raw materials. The product is a high protein product wherein the protein is composed of collagen, casein and whey protein. The collagen is preferably selected from a large number of raw materials and is characterized by being a safe raw material source; a unique two-stage process; and can play the role of the efficacy. The synergistic effect is exerted by reasonably selecting raw materials and designing the proportion of raw milk and collagen. The unpleasant fishy smell of the collagen is removed; the good flavor of the red yeast rice modified milk is ensured; through a certain process, the coloring efficiency of the red yeast rice is improved, so that the durability of the color is kept, and the brightness degree of the color is improved; the product ensures a high protein system formed by milk whey protein, casein and collagen and a system for red yeast rice to achieve dynamic stability, improves the stability of the whole system and truly exerts the functionality thereof.
Compared with the prior art, the invention has the following beneficial effects:
(1) the dairy product provided by the invention comprises the following raw materials: raw milk and collagen, wherein the mass ratio of the collagen to the total protein in the raw milk is not less than 6: and 5, by controlling the mass ratio of the collagen to the total protein in the raw milk, a synergistic effect can be generated, so that the collagen, the whey protein and the casein in the raw milk are combined to form a spatial and three-dimensional reticular structure, and the structure has higher toughness and firmness than a simple linear structure, so that the functional characteristics of the collagen are enhanced and are durable. When the ratio is less than 6:5, a spatial three-dimensional network structure cannot be formed, the collagen has significantly weaker functionality than the former, and the acting time is significantly shorter than the former.
(2) The dairy product provided by the invention has high protein content, and the content of the protein formed by the collagen, the whey protein contained in the milk and the casein is not less than 6 wt%, for example, 6-8 wt%. High protein products can provide more energy supplementation per volume. The energy and nutrition requirements of the human body are met. Meanwhile, the protein composition contains three different types of proteins, and can meet different requirements of human bodies more abundantly.
(3) The dairy product provided by the invention is added with red yeast rice, wherein the red yeast rice is obtained by fermenting rice through monascus. The color is natural, the natural pink color is endowed to the product, and the color lasts for a long time. The dairy product has effects of improving skin water retention capacity and skin elasticity. The hydration step ensures better hydrolysis of the starch; meanwhile, the full combination of collagen and milk protein is ensured to form a space structure, thereby achieving the effects of high protein system stability and protein performance.
(4) The preparation method of the dairy product provided by the invention comprises the steps of dissolving collagen and starch in part of raw milk, hydrating, adding sugar, a stabilizer and egg yolk powder, and mixing to obtain a first feed liquid; adding cream and red yeast rice into the rest raw milk, and performing second mixing to obtain a second feed liquid; and mixing the first feed liquid and the second feed liquid, and then sequentially carrying out constant volume, homogenization and sterilization to prepare the dairy product. In the preparation method, the red yeast rice is dissolved together with the cream and the rest of the raw milk, and the molecules of the cream are wrapped on the outer surface of each molecule of the red yeast rice, so that the surface area of the red yeast rice is increased, and the red yeast rice is more quickly dispersed in a milk system, so that the dissolving effect is greatly increased, and the coloring efficiency is improved; further, the second feed liquid containing the red yeast rice is dissolved in the system of the first feed liquid consisting of the other part of milk and the stabilizer, and is gradually and uniformly dissolved in the system, so that the coloring matter of the red yeast rice is uniformly and firmly combined with macromolecules such as protein, and the effect of lasting and stable color is achieved.
Detailed Description
The technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a dairy product and a preparation method thereof. The dairy product consists of the following raw materials in table 1:
table 1: ingredient table of raw materials
Figure BDA0002281326690000071
Figure BDA0002281326690000081
The preparation method of the dairy product comprises the following steps:
(1) pasteurizing all raw milk to obtain pasteurized milk, dissolving 650kg of pasteurized milk at normal temperature to dissolve collagen and starch, stirring at 6000r/min for 15min, stopping stirring, standing and hydrating for 30 min; heating to 40 deg.C, adding white sugar, stabilizer, and yolk powder, heating to 80 deg.C, stirring, and continuously stirring at 6000r/min for 10min to obtain first feed liquid;
(2) heating 300kg of pasteurized milk to 40 ℃, adding anhydrous cream and red yeast rice, and stirring at 6000r/min and 40 ℃ for 15min to obtain a second material liquid;
(3) mixing the first feed liquid and the second feed liquid, sequentially carrying out constant volume, homogenization, UHT sterilization, cooling and filling, wherein the homogenization temperature is 60 ℃, the pressure is 200bar, the secondary pressure is 35bar, the sterilization temperature is 137 ℃, and the time is 4s, so as to prepare the dairy product;
according to tests, the mass ratio of the collagen to the total protein in the raw milk in the embodiment is 36:27.55, and the protein content in the dairy product is 6%.
Example 2
The embodiment provides a dairy product and a preparation method thereof. The dairy product consisted of the raw materials in table 2 below:
table 2: ingredient table of raw materials
Composition (I) Weight (kg)
Raw milk 830.0
Collagen protein 40.0
Red yeast rice 0.8
White granulated sugar 50.0
Stabilizer 3.0
Anhydrous cream 4.0
Egg yolk powder 2.0
Starch 23.0
The preparation method of the dairy product comprises the following steps:
(1) pasteurizing all raw milk to obtain pasteurized milk, dissolving collagen and starch in 630kg of pasteurized milk at normal temperature, stirring at 5000r/min for 15min, stopping stirring, standing, and hydrating for 30 min; heating to 45 deg.C, adding white sugar, stabilizer, and yolk powder, heating to 85 deg.C, stirring, and continuously stirring at 5500r/min for 10min to obtain first feed liquid;
(2) heating 200kg of pasteurized milk to 45 ℃, adding anhydrous cream and red yeast rice, and stirring at 6500r/min and 45 ℃ for 15min to obtain a second feed liquid;
(3) mixing the first feed liquid and the second feed liquid, sequentially carrying out constant volume, homogenization, UHT sterilization, cooling and filling, wherein the homogenization temperature is 65 ℃, the pressure is 180bar, the secondary pressure is 40bar, the sterilization temperature is 135 ℃, and the time is 6s, so as to prepare the dairy product;
according to tests, the mass ratio of the collagen to the total protein in the raw milk in the embodiment is 40:24.07, and the protein content in the dairy product is 6%.
Example 3
The embodiment provides a dairy product and a preparation method thereof. The dairy product consisted of the raw materials in table 3 below:
table 3: ingredient table of raw materials
Composition (I) Weight (kg)
Raw milk 800.0
Collagen protein 52.0
Red yeast rice 1.5
White granulated sugar 10.0
Stabilizer 0.5
Anhydrous cream 15.0
Egg yolk powder 20.0
Starch 35.0
The preparation method of the dairy product comprises the following steps:
(1) pasteurizing all raw milk to obtain pasteurized milk, dissolving collagen and starch in 600kg pasteurized milk at normal temperature, stirring at 4500r/min for 15min, stopping stirring, standing, and hydrating for 30 min; heating to 42 deg.C, adding white sugar, stabilizer, and yolk powder, heating to 75 deg.C, stirring, and stirring at 5000r/min for 10min to obtain first feed liquid;
(2) heating 200kg of pasteurized milk to 40 ℃, adding anhydrous cream and red yeast rice, and stirring at 7000r/min and 40 ℃ for 15min to obtain a second feed liquid;
(3) mixing the first feed liquid and the second feed liquid, sequentially carrying out constant volume, homogenization, UHT sterilization, cooling and filling, wherein the homogenization temperature is 62 ℃, the pressure is 190bar, the secondary pressure is 30bar, the sterilization temperature is 130 ℃, and the time is 5s, thus preparing the dairy product;
according to tests, the mass ratio of the collagen to the total protein in the raw milk in the embodiment is 52:23.2, and the protein content in the dairy product is 7%.
Example 4
The embodiment provides a dairy product and a preparation method thereof. The dairy product consisted of the raw materials in table 4 below:
table 4: ingredient table of raw materials
Composition (I) Weight (kg)
Raw milk 900.0
Collagen protein 43.2
Red yeast rice 3.0
White granulated sugar 28.0
Stabilizer 5.0
Anhydrous cream 24.0
Egg yolk powder 16.0
Starch 5.0
The preparation method of the dairy product comprises the following steps:
(1) pasteurizing all raw milk to obtain pasteurized milk, dissolving collagen and starch in 620kg of pasteurized milk at normal temperature, stirring at 6800r/min for 15min, stopping stirring, standing, and hydrating for 30 min; heating to 43 deg.C, adding white sugar, stabilizer, and yolk powder, heating to 75 deg.C, stirring, and stirring at 6500r/min for 10min to obtain first feed liquid;
(2) heating 280kg of pasteurized milk to 40 ℃, adding anhydrous cream and red yeast rice, and stirring at 7000r/min and 40 ℃ for 15min to obtain a second feed liquid;
(3) mixing the first feed liquid and the second feed liquid, sequentially carrying out constant volume, homogenization, UHT sterilization, cooling and filling, wherein the homogenization temperature is 65 ℃, the pressure is 220bar, the secondary pressure is 38bar, the sterilization temperature is 140 ℃, and the time is 4s, thus preparing the dairy product;
according to tests, the mass ratio of the collagen to the total protein in the raw milk in the embodiment is 43.2:26.1, and the protein content in the dairy product is 6.5%.
Example 5
The embodiment provides a dairy product and a preparation method thereof. The dairy product consisted of the raw materials in table 5 below:
table 5: ingredient table of raw materials
Composition (I) Weight (kg)
Raw milk 990.0
Collagen protein 35.0
Red yeast rice 2.5
High fructose corn syrup 5.0
Stabilizer 4.0
Cream 30.0
Egg yolk powder 10.0
Starch 8.0
The preparation method of the dairy product comprises the following steps:
(1) pasteurizing all raw milk to obtain pasteurized milk, dissolving 650kg of pasteurized milk at normal temperature to dissolve collagen and starch, stirring at 7000r/min for 20min, stopping stirring, standing and hydrating for 25 min; heating to 40 deg.C, adding white sugar, stabilizer, and yolk powder, heating to 80 deg.C, stirring, and continuously stirring at 7200r/min for 8min to obtain first feed liquid;
(2) heating 300kg of pasteurized milk to 40 ℃, adding anhydrous cream and red yeast rice, and stirring at 8000r/min and 40 ℃ for 18min to obtain a second material liquid;
(3) mixing the first feed liquid and the second feed liquid, sequentially carrying out constant volume, homogenization, UHT sterilization, cooling and filling, wherein the homogenization temperature is 70 ℃, the pressure is 200bar, the secondary pressure is 35bar, the sterilization temperature is 130 ℃, and the time is 6s, thus preparing the dairy product;
according to tests, the mass ratio of the collagen to the total protein in the raw milk in the embodiment is 35:28.71, and the protein content in the dairy product is 6%.
Example 6
The embodiment provides a dairy product and a preparation method thereof. The difference from example 1 is that: the preparation method comprises the following steps:
(1) pasteurizing all raw milk to obtain pasteurized milk, dissolving 650kg pasteurized milk at normal temperature to dissolve collagen and starch, stirring at 6600r/min for 15min, stopping stirring, standing, and hydrating for 35 min; heating to 45 deg.C, adding white sugar, stabilizer, and yolk powder, heating to 75 deg.C, stirring, and stirring at 6800r/min for 12min to obtain first feed liquid;
(2) heating 300kg of pasteurized milk to 45 ℃, adding anhydrous cream and red yeast rice, and stirring at 7900r/min and 40 ℃ for 12min to obtain a second feed liquid;
(3) mixing the first feed liquid and the second feed liquid, sequentially carrying out constant volume, homogenization, UHT sterilization, cooling and filling, wherein the homogenization temperature is 65 ℃, the pressure is 220bar, the secondary pressure is 33bar, the sterilization temperature is 140 ℃, and the time is 4s, thus preparing the dairy product;
according to tests, the mass ratio of the collagen to the total protein in the raw milk in the embodiment is 36:27.55, and the protein content in the dairy product is 6%.
Comparative example 1
The comparative example provides a dairy product and a method of making the same. The only difference from example 4 is that: the addition amount of collagen in the comparative example was such that the mass ratio of collagen to total protein in raw milk was 1: 1.
comparative example 2
The comparative example provides a dairy product and a method of making the same. The only difference from example 4 is that: in the comparative example, the red yeast rice is not dissolved in a sectional manner, but is mixed with the white granulated sugar, the stabilizer and the yolk powder in the step (1) to obtain a first feed liquid.
Comparative example 3
The comparative example provides a dairy product and a method of making the same. The only difference from example 4 is that: in this comparative example carmine was used instead of red yeast rice.
Comparative example 4
The comparative example provides a dairy product and a method of making the same. The only difference from example 4 is that: in the comparative example, amaranth was used instead of red yeast rice.
Test example 1
And (3) taking the dairy products obtained in the examples 1-6 and the comparative examples 1-4 as experimental samples, and performing taste test on the products: the number of tested persons: 400 persons; the test mode is as follows: the method is characterized in that a taste mode is adopted to evaluate a plurality of indexes of the product, such as flavor, mouth feeling, milk fragrance, plumpness, sweetness, nutritive value recognition and the like, an unnamed scoring mode is adopted to evaluate the indexes, wherein the full score of the sweetness and the color is 10 points, the full score of other indexes is 20 points, and the higher the score of each index is, the better the expression effect is. The results of the statistical analysis were performed and are shown in Table 6 below.
Table 6: product taste index test data table
Figure BDA0002281326690000151
As can be seen from table 6: the dairy products obtained in the embodiments 1 to 6 have excellent flavor and taste, and in the comparative example 1, the mass ratio of the collagen to the milk is less than 6:5, so that the required ratio is not reached, and molecules of the collagen and molecules of the milk protein cannot form a three-dimensional network structure, and further cannot exert a synergistic effect, thereby influencing the exertion of functional characteristics. Although the flavor and the mouthfeel of the product are not changed greatly, the functional characteristics and the vividness and the durability of the color are influenced. In the comparative example 2, the red yeast rice does not adopt the step-by-step dissolving process, so that the color and luster of the product are unstable and the product is easy to precipitate. Thereby affecting the stability and overall preference of the finished product. In the comparative example 3, the carmine is used for replacing red yeast rice, so that the color vividness of the product is reduced, and the color durability is reduced. Thereby affecting the overall preference of the finished product. In comparative example 4, amaranth was used instead of red yeast rice, which resulted in a decrease in the brilliance of the color and a decrease in the color durability of the product. Thereby affecting the taste, overall preference and stability of the finished product.
Test example 2
Simulated gastric acid system, 1000mL deionized water, 2gNaCl, 7mL concentrated HCl and 3.2g pepsin were made up to a solution (pH about 1.5). And (3) shaking the sample No. 1 and the sample No. 2 in a 100mL gastric acid simulation system at 37 ℃, and filtering to remove precipitates. And (4) processing the filtered solution, and detecting by using an amino acid analyzer. No. 1 is a system with collagen added independently and without raw milk; no. 2 is a system for simultaneously adding collagen and raw milk, and the mass ratio of the collagen to the total protein in the raw milk is not less than 6:5, specifically 6: 5.
The results showed that hydroxyproline No. 1 was present in an amount of 5 wt% and hydroxyproline No. 2 was present in an amount of up to 26 wt%. The system of collagen and milk protein (namely raw milk) combination is proved, and the mass ratio of the collagen and the total protein in the raw milk is not less than 6: and 5, the spherical structure of the milk protein, particularly the casein, and the linear structure of the collagen form a stable composite structure, and the structure causes that the functional components of the collagen are not easily decomposed by gastric acid. Meanwhile, the two proteins are physically combined and are easy to open when being absorbed and utilized. Therefore, the synergistic effect is generated between the collagen and the milk protein, and the milk protein has the functions of protecting and promoting the collagen. Finally, the collagen is better absorbed and utilized, and the functional characteristics of the collagen are exerted to the maximum extent.
By adopting the method, the mass ratio of the collagen to the total protein in the raw milk is tested to be not less than 6: other ratios in 5, e.g. 7:5, 8:5, 9:5, also achieved comparable results to sample No. 2, much higher than sample No. 1.
Test example 3
The products of the different examples were subjected to the red yeast rice colour ingredient test: the dairy products prepared in example 4 and comparative example 2 were compared with red yeast rice for color component test during shelf life by ultraviolet-visible scanning and high performance liquid chromatography. Scanning within the range of 300-800 nm to obtain the characteristic absorption peak values of 3 components of monascus yellow pigment, alcohol-soluble monascus red pigment and water-soluble monascus red pigment in visible light. (example No. 1, comparative example 2), the results are shown in table 7 below:
table 7: product red yeast rice pigment component spectrum test meter
Figure BDA0002281326690000171
Figure BDA0002281326690000181
Figure BDA0002281326690000191
Figure BDA0002281326690000201
Figure BDA0002281326690000211
Figure BDA0002281326690000221
From the above results, it can be obtained: no. 1 adopts the red yeast rice stage dissolution process, can improve the dissolution efficiency of the pigment, improve the coloring efficiency, and simultaneously ensure the lasting and stable coloring. No. 2 does not adopt a red yeast rice stage dissolving process, so that the color can not be normally ensured in the shelf life, the color fading is advanced, the pigment is lost, and the stability of the whole product is lost. Similarly, the test results of the examples 1-3 and 5-6 are consistent with the test results of the example 4 by adopting the test method, and the monascus yellow pigment, the alcohol-soluble monascus red pigment and the water-soluble monascus red pigment can be still detected within 180 days.
Test example 4
And (3) product system stability test: the dairy products of examples 1 to 6 and comparative examples 1 to 4 were used as experimental samples, and static observation was performed under ambient conditions at room temperature (25 ℃), and the amount of protein precipitated in the product was measured by observing the floating of fat.
And (3) testing the stability of the protein: a certain amount of the product was weighed out, the supernatant of the product was poured out, the amount of the precipitate (wet weight) was directly measured by differential method, and the proportion of the precipitate to the total weight was calculated to reflect the precipitation of the protein, and the results are shown in Table 8. It can be seen that the dairy products obtained in the embodiments 1 to 6 have good overall stability, and can form a space structure by milk protein and collagen, so that the milk protein and the collagen stably exist in a liquid phase, the coagulation and precipitation of the protein are reduced, the stability is superior to that of similar market products, and the requirements of market nutrition, health and safety are met. However, the stability in the products obtained in comparative examples 1 to 4 was low.
Table 8: product protein stability table
Figure BDA0002281326690000231
Figure BDA0002281326690000241
As can be seen from Table 8, the centrifugal precipitation rate in the same time period was smaller in examples 1 to 6 than in comparative examples 1 to 4. Therefore, the dairy product prepared by the formula and the process provided by the embodiment of the invention has high stability and long shelf life.
Test example 5:
collagen function test of the product: the testing time is 3 months, every 7 days is a testing period, the testing number is 100, and the age is 28-40 years. The dairy products of examples 1 to 6 were used as test samples in a skin moisture tester and tested under ambient conditions at room temperature (25 ℃), and the test results are shown in table 9.
Table 9: product collagen function test table
Figure BDA0002281326690000251
Figure BDA0002281326690000261
Figure BDA0002281326690000271
As can be seen from table 9, example 4 is a combination of the best skin water retention and the highest skin elasticity improvement. Comparative examples 1-4 are only intended as comparisons of product color and are not examples of functional testing.
It should be understood that the above-described embodiments are merely examples for clarity of description and are not intended to limit the scope of the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This list is neither intended to be exhaustive nor exhaustive. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (12)

1. A dairy product comprising the following raw materials: raw milk and collagen, wherein the mass ratio of the collagen to the total protein in the raw milk is not less than 6: 5.
2. the dairy product of claim 1, wherein the mass ratio of collagen to total protein in raw milk is (6-8): 5.
3. the dairy product according to claim 1 or 2, wherein the protein content in the dairy product is not less than 6 wt%.
4. The dairy product according to claim 3, wherein the protein content in the dairy product is 6-8 wt%.
5. The dairy product according to any of claims 1 to 4, comprising the following raw materials in parts by weight:
80-99 parts of raw milk
3.5-6 parts of collagen
0.08-0.3 part of red yeast rice
0.5-5 parts of sugar
0.05-0.5 part of stabilizer.
6. The dairy product of claim 5, further comprising the following raw materials in parts by weight:
0.4-3 parts of cream
0.2-2 parts of yolk powder
0.5-3.5 parts of starch.
7. The dairy product of claim 6, wherein the sugar is at least one of white granulated sugar, high fructose corn syrup, maltose;
the stabilizer is at least one of monoglyceride, sucrose ester, carrageenan, xanthan gum and locust bean gum;
the cream is anhydrous cream and/or dilute cream.
8. A method for preparing a dairy product, comprising the steps of:
dissolving collagen and starch in part of raw milk, hydrating, adding sugar, stabilizer and yolk powder, and mixing to obtain first feed liquid;
adding cream and red yeast rice into the rest raw milk, and performing second mixing to obtain a second feed liquid;
and mixing the first feed liquid and the second feed liquid, and then sequentially carrying out constant volume, homogenization and sterilization to prepare the dairy product.
9. The preparation method according to claim 8, wherein the hydration is to mix the mixture of collagen, starch and partial raw milk at a mixing speed of 4000-;
before adding sugar, stabilizer and yolk powder, heating the hydrated mixture to 40-45 ℃;
the stirring speed of the first mixing is 4000-.
10. The method of claim 8 or 9, wherein prior to adding the cream and red yeast rice to the remaining raw milk, further comprising warming the remaining raw milk to 40-45 ℃;
the stirring speed of the second mixing is 6000-.
11. The method according to any one of claims 8 to 10, wherein the temperature of the homogenization is 60 to 70 ℃, the pressure is 180-220bar, and the secondary pressure is 30 to 40 bar;
the sterilization temperature is 130-140 ℃, and the time is 4-6 s.
12. The preparation method according to any one of claims 8-12, wherein the mass ratio of the partial raw milk to the residual raw milk is (600- > 650): (200-300).
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