CN113016956A - Casein phosphopeptide selenium microcapsule-added dog food and preparation method thereof - Google Patents
Casein phosphopeptide selenium microcapsule-added dog food and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a casein phosphopeptide selenium microcapsule-added dog food and a preparation method thereof, and relates to the technical field of pet food and health care; according to the invention, by preparing the casein phosphopeptide and selenium chelate, inorganic selenium is converted into organic selenium, the utilization rate and safety of selenium are obviously improved, trace elements are supplemented while the function of bioactive peptide is exerted, the effect of controlling the release rate of active substances is achieved by combining a microcapsule technology on the basis, and the biological effectiveness and solubility of selenium in pet intestinal tracts are improved; the invention accords with the trend that people pay more and more attention to the nutrition and health of pet food at present, and has important significance for the development of pet dietary nutrition supplements.
Description
Technical Field
The invention relates to the technical field of pet food and health care, in particular to a dog food added with casein phosphopeptide selenium microcapsules and a preparation method thereof.
Background
Selenium is an indispensable trace element in the animal development process, animals mainly take the selenium element through feed, and the lack of the selenium element can influence the immune function of the animals. In the absence of selenium, the risk of developing atypical infectious hepatitis and other diseases in dogs is significantly increased. Therefore, in order to improve the body immunity of the dogs, the intake of selenium can be properly increased, and the quantity of the immunoglobulin in the body can be effectively recovered. In addition, the selenium element also has the biological functions of promoting the bone development and the tooth growth of dogs, regulating the absorption and the consumption of vitamins, clearing free radicals in dogs and the like. The existing selenium supplement method generally adopts inorganic sodium selenate or sodium selenite preparation, however, researches show that organic selenium is more beneficial to absorption and utilization in order to achieve the purpose of nutrition supplement.
The casein phosphopeptide is a bioactive polypeptide, and has the unique advantages of good safety, good stability, low cost and the like when being added into animal food. The casein phosphopeptide can be combined with calcium, iron, zinc, copper, selenium, manganese and the like through phosphoserine under neutral and alkaline conditions to form soluble organic phosphate which is used as a carrier for transporting a plurality of mineral elements in vivo, thereby effectively preventing the mineral elements from precipitating in small intestines and promoting the absorption of the mineral elements.
The microcapsule technology is a technology of wrapping trace substances in a polymer film, is a micro-packaging technology for storing solid, liquid and gas, and particularly refers to a technology of completely wrapping an internal phase by a natural or synthetic high molecular compound continuous external phase without any loss of original chemical properties of the internal phase, and then gradually enabling the function of the internal phase to be externally presented again through some external stimulation or slow release action.
At present, no report of preparing dog food by combining the organic selenium bioactive peptide with the microcapsule technology is found, so that the successful research and development of the technology of combining the organic selenium bioactive peptide with the microcapsule technology to prepare the dog food has important significance for the development of animal dietary nutritional supplements.
Disclosure of Invention
The invention aims to provide a casein phosphopeptide selenium microcapsule-added dog food and a preparation method thereof. On the basis, the effect of controlling the release rate of the active substances is achieved by combining the microcapsule technology, and the bioavailability and the solubility of selenium in the intestinal tract of the pet are improved. The invention accords with the trend that people pay more and more attention to the nutrition and health of pet food at present, and has important significance for the development of pet dietary nutrition supplements.
In order to achieve the purpose, the invention provides a dog food added with casein phosphopeptide selenium microcapsules, which comprises the following raw materials in parts by weight: 22-32 parts of chicken powder, 8-12 parts of fish meal, 10-12 parts of peas, 6-9 parts of chicken meat, 8-10 parts of dried sweet potatoes, 5-8 parts of chicken oil, 8-10 parts of potato powder, 3-5 parts of a taste enhancer, 1-5 parts of fish oil, 1-5 parts of beer yeast powder, 1-1.5 parts of filamentous chicken meat, 0.5-1.5 parts of duck meat, 0.5-1.5 parts of mutton, 0.5-1.5 parts of salmon, 0.5-1.5 parts of anchovy, 1-5 parts of linseed oil, 1-2 parts of cheese powder, 1-2 parts of yolk powder, 5-8 parts of fruits and vegetables, 1-5 parts of premix and 0.3-0.5 part of casein phosphopeptide selenium microcapsule.
Further, after the casein phosphopeptide is chelated with inorganic selenium, microencapsulation treatment is carried out to obtain the casein phosphopeptide selenium microcapsule.
Further, the fruits and vegetables comprise one or more of red algae, yucca, spinach, apples, pumpkins, carrots, pears and blueberries.
Further, the premix comprises one or more of a compound vitamin, a compound mineral and a compound amino acid.
Further, said multivitamins, bagsComprises vitamin A, vitamin C, and vitamin D3Vitamin E, vitamin B1Vitamin B2Vitamin B6Vitamin B12One or more of D-biotin, nicotinic acid, D-calcium pantothenate, folic acid, and choline chloride;
the composite mineral comprises one or more of copper amino acid complex, iron amino acid complex, manganese amino acid complex and zinc amino acid complex;
the compound amino acid comprises one or more of cellulose, DL-methionine, fructo-oligosaccharide and lecithin.
The invention also provides a preparation method of the dog food, which comprises the following steps:
(1) crushing: crushing the raw materials except the casein phosphopeptide selenium microcapsule and sieving the crushed raw materials with a 80-mesh sieve;
(2) tempering: carrying out high-temperature tempering on the potato whole powder, adding other raw materials, and mixing and carrying out low-temperature tempering to obtain a mixed material;
(3) puffing and drying: extruding and puffing the mixed material at the puffing temperature of 120-125 ℃, granulating to obtain material particles, drying the material particles at the temperature of 115-120 ℃, and controlling the water content to be 6-8%;
(4) spraying: adding fish oil, chicken oil and oleum Lini, spraying the dried material particles, and sterilizing at low temperature.
Further, the preparation method of the casein phosphopeptide selenium microcapsule comprises the following steps:
(1) mixing casein phosphopeptide solution and 0.5-2mol/L sodium selenite solution according to the volume ratio of 6:1-6:5, continuously reacting at the temperature of 40-80 ℃ and the pH value of 3-10, cooling after the reaction is finished, centrifuging to remove supernatant to obtain precipitate, and washing the precipitate with absolute ethyl alcohol with the volume 3-5 times of that of the precipitate to obtain casein phosphopeptide selenium chelate;
(2) the mass ratio of (1-5): 1, fully dispersing lecithin in ethanol, adding distilled water, and fully stirring to obtain lecithin emulsion;
(3) and dissolving the casein phosphopeptide selenium chelate in distilled water, adding the prepared lecithin emulsion, uniformly stirring, and performing spray drying to obtain the casein phosphopeptide selenium microcapsule.
Further, the preparation method of the casein phosphopeptide comprises the following steps: the mass ratio is (0.1-0.5): 1, mixing the casein hydrolysate with anhydrous calcium chloride, standing, adding ethanol with the same volume amount as the casein hydrolysate, centrifuging and collecting precipitates to obtain the casein phosphopeptide.
The invention discloses the following technical effects:
(1) according to the invention, the situation that inorganic selenium is used as a nutritional supplement in the past is changed, and the inorganic selenium is converted into organic selenium aiming at the nutritional requirement of the pet on the selenium, so that the absorption and utilization rate of the pet on the selenium is improved, and the immunity of the organism is effectively improved.
(2) The casein phosphopeptide and selenium are subjected to chelation reaction, so that the prepared casein phosphopeptide selenium chelate has the effect of selenium peptide double supplement, and the absorption and digestion of other mineral elements are promoted.
(3) The invention combines the microcapsule technology, uses lecithin as a wall material to embed the casein phosphopeptide selenium chelate to prepare the casein phosphopeptide selenium microcapsule, can not only keep the biological activity of peptide and selenium, but also achieve the purpose of controlling the slow release of the peptide and the selenium, and fully play a role in pet organisms.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
The present invention will be described in further detail with reference to specific embodiments in order to make the above objects, features and advantages more apparent and understandable.
Example 1
The dog food added with the casein phosphopeptide selenium microcapsules comprises the following raw materials in parts by weight: 22 parts of chicken powder, 12 parts of fish meal, 10 parts of peas, 9 parts of frozen chicken, 8 parts of dried sweet potatoes, 5 parts of chicken oil, 8 parts of potato powder, 3.5 parts of a taste enhancer, 3 parts of fish oil, 2 parts of beer yeast powder, 1 part of filamentous chicken, 1 part of frozen duck, 1 part of frozen mutton, 1 part of frozen salmon, 1 part of frozen anchovy, 2 parts of linseed oil, 1 part of cheese powder, 1 part of yolk powder, 5 parts of fruits and vegetables, 3 parts of premix and 0.5 part of casein phosphopeptide selenium microcapsule.
Is prepared by the following steps:
(1) preparing casein phosphopeptide selenium microcapsules:
enzymolysis: completely dissolving casein in sodium hydroxide solution to prepare casein solution with protein mass concentration of 5%. Adjusting pH to 7 with sodium hydroxide, maintaining the temperature at 45 deg.C, adding alkaline protease for enzymolysis for 2 hr, and inactivating enzyme to obtain enzymatic hydrolysate. Regulating pH to 4 with hydrochloric acid, centrifuging, and collecting supernatant to obtain casein hydrolysate.
Carrying out chelation reaction: the mass ratio is 0.1: 1, mixing the casein hydrolysate with anhydrous calcium chloride, standing for 1h, adding ethanol with the same volume amount as the casein hydrolysate, centrifuging and collecting precipitates to obtain casein phosphopeptide. Mixing the casein phosphopeptide solution and 0.5mol/L sodium selenite solution according to the volume ratio of 6:1, continuously reacting for 1h under the conditions that the temperature is 40 ℃ and the pH value is 3, cooling, centrifuging, and washing precipitates by using 3 times of volume of absolute ethyl alcohol to obtain the casein phosphopeptide selenium chelate.
Microencapsulation: the mass ratio of the components is 1: 1, fully dispersing lecithin in ethanol, adding distilled water with the mass 5 times that of the lecithin, and fully stirring to prepare lecithin emulsion; and dissolving the casein phosphopeptide selenium chelate in distilled water, adding the prepared lecithin emulsion, uniformly stirring, and performing spray drying to obtain the casein phosphopeptide selenium microcapsule.
(2) Crushing: the raw materials are crushed to the fineness of 90 percent according to the weight portion and are sieved by a 80-mesh sieve.
(3) Tempering: and (3) carrying out high-temperature tempering on the potato whole powder, and then adding other raw materials containing casein phosphopeptide selenium microcapsules for mixing and carrying out low-temperature tempering.
(4) Puffing and drying: putting the mixed material into a bulking machine, extruding and bulking the material at a bulking temperature of 120 ℃, and granulating by a die; drying the material particles at 115 deg.C, and controlling water content to 6%.
(5) Spraying and packaging: adding fish oil, chicken oil and linseed oil when spraying the granules, sterilizing at low temperature, and packaging according to specifications.
Example 2
The dog food added with the casein phosphopeptide selenium microcapsules comprises the following raw materials in parts by weight: 24 parts of chicken powder, 9 parts of fish meal, 11 parts of peas, 6 parts of frozen chicken, 8 parts of dried sweet potatoes, 5 parts of chicken oil, 8 parts of potato powder, 3.6 parts of taste enhancer, 1 part of fish oil, 1 part of beer yeast powder, 1 part of filamentous chicken, 1.5 parts of frozen duck, 1.5 parts of frozen mutton, 1.5 parts of frozen salmon, 1.5 parts of frozen anchovy, 3 parts of linseed oil, 1 part of cheese powder, 1 part of egg yolk powder, 7 parts of fruits and vegetables, 4 parts of premix and 0.4 part of casein phosphopeptide selenium microcapsule.
The dog food added with the casein phosphopeptide selenium microcapsule is prepared by the following steps:
(1) preparing casein phosphopeptide selenium microcapsules:
(a) enzymolysis: completely dissolving casein in sodium hydroxide solution to prepare casein solution with protein mass concentration of 6%. Adjusting pH to 8 with sodium hydroxide, maintaining the temperature at 50 deg.C, adding alkaline protease for enzymolysis for 3 hr, and inactivating enzyme to obtain enzymatic hydrolysate. Regulating pH to 4.5 with hydrochloric acid, centrifuging, and collecting supernatant to obtain casein hydrolysate.
(b) Carrying out chelation reaction: the mass ratio is 0.3: 1, mixing the casein hydrolysate with anhydrous calcium chloride, standing for 1h, adding ethanol with the same volume amount as the casein hydrolysate, centrifuging and collecting precipitates to obtain casein phosphopeptide. Mixing the casein phosphopeptide solution and 1mol/L sodium selenite solution according to the volume ratio of 6:3, continuously reacting for 1.5h under the conditions that the temperature is 60 ℃ and the pH value is 7, cooling, centrifuging, and washing precipitates by using anhydrous ethanol with 4 times of volume to obtain the casein phosphopeptide selenium chelate.
(c) Microencapsulation: fully dispersing lecithin in ethanol according to the proportion of 3:1, adding distilled water with the mass 13 times that of the lecithin, and fully stirring to obtain lecithin emulsion; and dissolving the casein phosphopeptide selenium chelate in distilled water, adding the prepared lecithin emulsion, uniformly stirring, and performing spray drying to obtain the casein phosphopeptide selenium microcapsule.
(2) Crushing: the raw materials are crushed to the fineness of 90 percent according to the weight portion and are sieved by a 80-mesh sieve.
(3) Tempering: and (3) carrying out high-temperature tempering on the potato whole powder, and then adding other raw materials containing casein phosphopeptide selenium microcapsules for mixing and carrying out low-temperature tempering.
(4) Puffing and drying: putting the mixed material into a bulking machine, extruding and bulking the material at a bulking temperature of 125 ℃, and granulating by a die; drying the material particles at 120 deg.C, and controlling water content to 7%.
(5) Spraying and packaging: adding fish oil, chicken oil and linseed oil when spraying the granules, sterilizing at low temperature, and packaging according to specifications.
Example 3
The dog food added with the casein phosphopeptide selenium microcapsules comprises the following raw materials in parts by weight: 29 parts of chicken powder, 8 parts of fish meal, 12 parts of peas, 6 parts of frozen chicken meat, 9 parts of dried sweet potatoes, 6 parts of chicken oil, 9 parts of potato whole powder, 3.2 parts of taste enhancer, 1 part of fish oil, 1 part of beer yeast powder, 1.5 parts of filamentous chicken meat, 0.5 part of frozen duck meat, 0.5 part of frozen mutton, 0.5 part of frozen salmon, 0.5 part of frozen anchovy, 1 part of linseed oil, 1.5 parts of cheese powder, 1.5 parts of egg yolk powder, 6 parts of fruits and vegetables, 2 parts of premix and 0.3 part of casein phosphopeptide selenium microcapsule.
In the more specific embodiment, the dog food added with the casein phosphopeptide selenium microcapsule is prepared by the following steps:
(1) preparing casein phosphopeptide selenium microcapsules:
(a) enzymolysis: completely dissolving casein in sodium hydroxide solution to prepare casein solution with protein mass concentration up to 7%. Adjusting pH to 10 with sodium hydroxide, maintaining the temperature at 60 deg.C, adding alkaline protease for enzymolysis for 3 hr, and inactivating enzyme to obtain enzymatic hydrolysate. Regulating pH to 5 with hydrochloric acid, centrifuging, and collecting supernatant to obtain casein hydrolysate.
(b) Carrying out chelation reaction: the mass ratio is 0.5: 1, mixing the casein hydrolysate with anhydrous calcium chloride, standing for 1h, adding ethanol with the same volume amount as the casein hydrolysate, centrifuging and collecting precipitates to obtain casein phosphopeptide. Mixing the casein phosphopeptide solution and 2mol/L sodium selenite solution according to the volume ratio of 6:5, continuously reacting for 2h under the conditions that the temperature is 80 ℃ and the pH value is 10, cooling, centrifuging, and washing precipitates by using 5 times of volume of absolute ethyl alcohol to obtain the casein phosphopeptide selenium chelate.
(c) Microencapsulation: fully dispersing lecithin in ethanol according to the mass ratio of 5:1, adding distilled water with the mass of 20 times that of the lecithin, and fully stirring to obtain lecithin emulsion; and dissolving the casein phosphopeptide selenium chelate in distilled water, adding the prepared lecithin emulsion, uniformly stirring, and performing spray drying to obtain the casein phosphopeptide selenium microcapsule.
(2) Crushing: the raw materials are crushed to the fineness of 90 percent according to the weight portion and are sieved by a 80-mesh sieve.
(3) Tempering: and (3) carrying out high-temperature tempering on the potato whole powder, and then adding other raw materials containing casein phosphopeptide selenium microcapsules for mixing and carrying out low-temperature tempering.
(4) Puffing and drying: putting the mixed material into a bulking machine, extruding and bulking the material at a bulking temperature of 120 ℃, and granulating by a die; drying the material particles at 120 deg.C, and controlling water content to 8%.
(5) Spraying and packaging: adding fish oil, chicken oil and linseed oil when spraying the granules, sterilizing at low temperature, and packaging according to specifications.
Comparative example 1
The raw materials are the same as example 1, with the only difference that the casein phosphopeptide selenium microcapsules are replaced by casein phosphopeptide selenium chelate.
The dog food added with the casein phosphopeptide selenium chelate is prepared by the following steps:
(1) preparation of casein phosphopeptide selenium chelate:
(a) enzymolysis: completely dissolving casein in sodium hydroxide solution to prepare casein solution with protein mass concentration up to 7%. Adjusting pH to 10 with sodium hydroxide, maintaining the temperature at 60 deg.C, adding alkaline protease for enzymolysis for 3 hr, and inactivating enzyme to obtain enzymatic hydrolysate. Regulating pH to 5 with hydrochloric acid, centrifuging, and collecting supernatant to obtain casein hydrolysate.
(b) Carrying out chelation reaction: adding anhydrous calcium chloride into the casein hydrolysate, standing for 1h, adding ethanol with the volume amount equal to that of the casein hydrolysate, centrifuging, and collecting precipitate to obtain casein phosphopeptide. Mixing the casein phosphopeptide solution and 2mol/L sodium selenite solution according to the volume ratio of 6:5, continuously reacting for 2h under the conditions that the temperature is 80 ℃ and the pH value is 10, cooling, centrifuging, and washing precipitates by using 5 times of volume of absolute ethyl alcohol to obtain the casein phosphopeptide selenium chelate.
(2) Crushing: the raw materials are crushed to the fineness of 90 percent according to the weight portion and are sieved by a 80-mesh sieve.
(3) Tempering: after the whole potato flour is subjected to high-temperature tempering, other raw materials containing casein phosphopeptide selenium chelate are added for mixing and low-temperature tempering.
(4) Puffing and drying: putting the mixed material into a bulking machine, extruding and bulking the material at a bulking temperature of 130 ℃, and granulating by a die; drying the material particles at 120 deg.C, and controlling water content to 8%.
(5) Spraying and packaging: adding fish oil, chicken oil and linseed oil when spraying the granules, sterilizing at low temperature, and packaging according to specifications.
Comparative example 2
The only difference between the starting materials and example 1 is that the casein phosphopeptide selenium microcapsules were replaced by inorganic selenium, sodium selenite being the most commonly used feed additive, and therefore the inorganic selenium used in this comparative example was sodium selenite.
The dog food added with inorganic selenium (sodium selenite) is prepared by the following steps:
(1) crushing: the raw materials are crushed to the fineness of 90 percent according to the weight portion and are sieved by a 80-mesh sieve.
(2) Tempering: carrying out high-temperature tempering on the potato whole powder, and then adding other raw materials containing sodium selenite for mixing and carrying out low-temperature tempering.
(3) Puffing and drying: putting the mixed material into a bulking machine, extruding and bulking the material at a bulking temperature of 125 ℃, and granulating by a die; drying the material particles at 120 deg.C, and controlling water content to 8%.
(4) Spraying and packaging: adding fish oil, chicken oil and linseed oil when spraying the granules, sterilizing at low temperature, and packaging according to specifications.
1. Results of feeding
The commercially available dog food was used as a control group, 20 dogs (10 dogs in the growing period and 10 dogs in the adult period) having the same age and health condition were fed with the dog food prepared in examples 1 to 3 and comparative examples 1 to 2, respectively, the average weight gain of each group was measured, and the selenium content and the lipid peroxide (LOP) content in blood were measured, with the results of feeding dogs in the growing period shown in table 1 and the results of feeding adult dogs shown in table 1.
TABLE 1 results of feeding dogs in growing period
Table 2 adult dog feeding results
As can be seen from tables 1-2:
(1) compared with sodium selenite, the dog fed with the organic selenium has larger selenium storage amount, and the retention rate of the organic selenium in tissues is higher than that of the sodium selenite; compared with casein phosphopeptide selenium chelate, the edible casein phosphopeptide selenium microcapsule has larger canine selenium storage amount and higher retention rate.
(2) The dog food containing the casein phosphopeptide selenium microcapsules can effectively promote growth of dogs in a growing period and can effectively maintain health of adult dogs.
(3) The dog food containing the casein phosphopeptide selenium microcapsules can effectively reduce the LOP content in dogs, improve the oxidation resistance and immunity of dogs, and delay aging.
In addition, excessive intake of selenium can cause selenium poisoning, the difference between the minimum required amount of selenium for dogs and the poisoning dose is small, and after the dogs eat the dog food of the embodiments 1 to 3, all dogs do not have any symptoms related to selenium poisoning, which shows that the dog food can effectively avoid selenium poisoning.
2. Product stability testing and results
The casein phosphopeptide activity loss rate and the selenium loss rate were measured after 3 months of storage under the same common storage conditions for dog food in examples 1 to 3 and comparative examples 1 to 2, and the results are shown in Table 3.
TABLE 3 product stability test
As can be seen from the above table, the canine foods prepared in examples 1 to 3 of the present application can maintain the activity of casein phosphopeptide well after being stored for 3 months, and the loss of selenium is extremely low, so that the canine foods prepared in examples 1 to 3 of the present application have good stability.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (8)
1. The dog food added with the casein phosphopeptide selenium microcapsules is characterized by comprising the following raw materials in parts by mass: 22-32 parts of chicken powder, 8-12 parts of fish meal, 10-12 parts of peas, 6-9 parts of chicken meat, 8-10 parts of dried sweet potatoes, 5-8 parts of chicken oil, 8-10 parts of potato powder, 3-5 parts of a taste enhancer, 1-5 parts of fish oil, 1-5 parts of beer yeast powder, 1-1.5 parts of filamentous chicken meat, 0.5-1.5 parts of duck meat, 0.5-1.5 parts of mutton, 0.5-1.5 parts of salmon, 0.5-1.5 parts of anchovy, 1-5 parts of linseed oil, 1-2 parts of cheese powder, 1-2 parts of yolk powder, 5-8 parts of fruits and vegetables, 1-5 parts of premix and 0.3-0.5 part of casein phosphopeptide selenium microcapsule.
2. The dog food according to claim 1, wherein the casein phosphopeptide selenium microcapsule is prepared by chelating casein phosphopeptide with inorganic selenium and then microencapsulating the chelated casein phosphopeptide selenium microcapsule.
3. The dog food of claim 1, wherein: the fruit and vegetable includes one or more of red algae, yucca, spinach, apple, pumpkin, carrot, pear and blueberry.
4. The dog food of claim 1, wherein: the premix comprises one or more of compound vitamins, compound minerals and compound amino acids.
5. The dog food of claim 4, wherein: the compound vitamin comprises vitamin A, vitamin C, and vitamin D3Vitamin E, vitamin B1Vitamin B2Vitamin B6Vitamin B12One or more of D-biotin, nicotinic acid, D-calcium pantothenate, folic acid, and choline chloride;
the composite mineral comprises one or more of copper amino acid complex, iron amino acid complex, manganese amino acid complex and zinc amino acid complex;
the compound amino acid comprises one or more of cellulose, DL-methionine, fructo-oligosaccharide and lecithin.
6. A method of preparing the canine food of any one of claims 1 to 5, comprising the steps of:
(1) crushing: crushing the raw materials except the casein phosphopeptide selenium microcapsule and sieving the crushed raw materials with a 80-mesh sieve;
(2) tempering: carrying out high-temperature tempering on the potato whole powder, adding other raw materials, and mixing and carrying out low-temperature tempering to obtain a mixed material;
(3) puffing and drying: extruding and puffing the mixed material at the puffing temperature of 120-125 ℃, granulating to obtain material particles, drying the material particles at the temperature of 115-120 ℃, and controlling the water content to be 6-8%;
(4) spraying: adding fish oil, chicken oil and oleum Lini, spraying the dried material particles, and sterilizing at low temperature.
7. The preparation method of claim 6, wherein the casein phosphopeptide selenium microcapsule is prepared by the following steps:
(1) mixing casein phosphopeptide solution and 0.5-2mol/L sodium selenite solution according to the volume ratio of 6:1-6:5, continuously reacting at the temperature of 40-80 ℃ and the pH value of 3-10, cooling after the reaction is finished, centrifuging to remove supernatant to obtain precipitate, and washing the precipitate with absolute ethyl alcohol with the volume 3-5 times of that of the precipitate to obtain casein phosphopeptide selenium chelate;
(2) the mass ratio of (1-5): 1, fully dispersing lecithin in ethanol, adding distilled water with the mass of 5-20 times of that of the lecithin, and fully stirring to prepare lecithin emulsion;
(3) and dissolving the casein phosphopeptide selenium chelate in distilled water, adding the prepared lecithin emulsion, uniformly stirring, and performing spray drying to obtain the casein phosphopeptide selenium microcapsule.
8. The method according to claim 7, wherein the casein phosphopeptide is prepared by: the mass ratio is (0.1-0.5): 1, mixing the casein hydrolysate with anhydrous calcium chloride, standing, adding anhydrous ethanol with the same volume amount as the casein hydrolysate, centrifuging and collecting precipitates to obtain the casein phosphopeptide.
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