Preparation technology of freeze-dried food with high rehydration property for pets

Abstract

The invention relates to a preparation technology of freeze-dried food with high rehydration property for pets, and belongs to the technical field of pet food. According to the freeze-dried pet food disclosed by the invention, the rehydration property and the palatability of the freeze-dried pet food are improved by adding the plant extract treated by the modified nano zinc alginate and the polyglutamic acid into a traditional formula, and comprehensive nutrition is provided for pets through cooperation of all the substances. In the technical process, liquid carbon dioxide is introduced in the stirring process, moisture of all the components can be locked in advance, and then the freeze-dried pet food with the high rehydration property is obtained through subsequent further freeze-drying and sterilization.

Description

Technical Field

[0001] The invention belongs to the technical field of pet food and relates to a preparation process of high-rehydration pet freeze-dried food. Background Art

[0002] Freeze-dried food is made by vacuum-freezing and drying fresh ingredients. Only the water is extracted, and the nutrients in the ingredients are preserved intact. It is a very meticulous and demanding process. Freeze-dried pet food is the freshest, least processed, and can ensure healthy pet food with comprehensive and balanced nutrition.

[0003] The freeze-drying process used in raw bone and meat freeze-dried products does not go through a heating process, which maintains the biological activity of the protein (amino acid), minerals, and fat in the food, greatly improving the overall availability and digestibility of the food for cats and dogs. At the same time, it can keep the texture of the food unchanged, effectively locking in the aroma and taste of the food. If it is rehydrated (soaked in water) and restored, it can enjoy the nutrition and deliciousness of raw food.

[0004] Feeding raw bone and meat freeze-dried products is very convenient, just add water and soak it, and it is easy to carry, has a long shelf life, and is easy to store. However, freeze-dried foods, especially freeze-dried raw bones and meat, generally have poor water retention after rehydration in the air, and the flavor is easily lost in the air after rehydration. They have a certain hardness, which affects the taste of pets. After multiple feedings, pets have lost their appetite, anorexia, and refusal to eat.

[0005] Therefore, it is necessary to develop a pet freeze-dried food that can be used to prepare high rehydration properties. Summary of the invention

[0006] The object of the present invention is to provide a preparation process of a pet freeze-dried food with high rehydration property. The freeze-dried food prepared by the process of the present invention has excellent rehydration property.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A preparation process of a highly rehydrating pet freeze-dried food comprises the following preparation steps:

[0009] S1. Prepare mixed material:

[0010] S1.1. Mix 30-40 parts of meat, 5-10 parts of viscera, 2-4 parts of salmon, and 1-2 parts of fat by weight, tumble and knead, and then grind them with a meat grinder to obtain minced meat, thereby obtaining a mixture A;

[0011] S1.2, placing mixture A in a vacuum mixer, introducing liquid carbon dioxide gas, and continuing to add 3-5 parts of fruits and vegetables, 1-2 parts of modified nano zinc alginate, 2-4 parts of trehalose, 0.5-1 part of prebiotics and 3-6 parts of citric acid, and mixing at a speed of 600 r / min for 2 hours to obtain mixture B;

[0012] S1.3, mixing mixture B and 1-2 parts of plant extracts with stirring for 2 hours at a constant speed to obtain a mixture;

[0013] The preparation process of the plant extract is as follows:

[0014] 0.1-0.3 parts of green tea extract, 0.1-0.3 parts of licorice extract and 0.1-0.3 parts of yam extract are mixed, ground by a ball mill at a speed of 400 r / min for 2 hours, added to 20-30 parts of an aqueous solution of polyglutamic acid, stirred at a speed of 500 r / min for 50 minutes, and spray-dried to obtain the plant extract;

[0015] S2. Freeze-drying:

[0016] Freeze the mixture at -50 to -30°C and a vacuum degree of 1 to 2 Pa for 20 to 30 hours, and put the frozen product into a dicer to make block particles;

[0017] S3. Pasteurization:

[0018] The block particles are placed in a pasteurization device, the temperature is set at 68-72° C., the treatment is continued for 15-25 seconds, and then immediately cooled to 30-35° C. to prepare the highly rehydratable pet freeze-dried food.

[0019] As a preferred technical solution of the present invention, in step S1.1, the oil is lecithin and modified soybean lecithin in a mass ratio of 1:1.

[0020] As a preferred technical solution of the present invention, in step S1.1, the meat is one of rabbit meat, chicken, beef, pigeon meat and venison.

[0021] As a preferred technical solution of the present invention, in step S1.1, the viscera are one or more of pigeon heart, pigeon liver, rabbit heart, rabbit liver, ox heart, ox liver, chicken heart and chicken liver.

[0022] As a preferred technical solution of the present invention, in step S1.2, the preparation process of the modified nano zinc alginate is as follows:

[0023] Step 1, dissolving sodium alginate in purified water, stirring at a speed of 500 r / min for 0.5 to 1 h, and then slowly adding zinc chloride, wherein the molar ratio of sodium alginate to zinc chloride is 2:1, and maintaining the speed and stirring for 3 to 4 h to obtain a first mixed solution;

[0024] Step 2, subjecting the first mixed solution to high-speed centrifugal separation, washing the separated solid with purified water for 3 times and then freeze-drying it to obtain nano zinc alginate;

[0025] Step 3, 10 parts of egg white protein and 200 parts of distilled water are uniformly mixed, the temperature is raised to 45-60°C, 0.5-1 part of papain is added, and constant temperature enzymolysis is performed for 10-15 hours under stirring conditions to obtain an enzymolysis mixture, and nano-zinc alginate with a mass ratio of 1:5 is uniformly mixed with the enzymolysis mixture under stirring, and stirred at a speed of 400r / min for 18-24h at room temperature. After the stirring is completed, centrifuge at a speed of 10000-12000rpm for 15-20min, separate the obtained solid and freeze-dry it, and the obtained solid is ball-milled at a speed of 400r / min for 3h in a ball mill and then passed through a 200-mesh sieve to obtain modified nano-zinc alginate.

[0026] As a preferred technical solution of the present invention, in step S1.2, the fruits and vegetables are one or more of pumpkin, carrot, cucumber and rosemary.

[0027] As a preferred technical solution of the present invention, in step S1.3, the polyglutamic acid aqueous solution is a polyglutamic acid aqueous solution with a mass fraction of 5 to 10%.

[0028] As a preferred technical solution of the present invention, in step 2, the rotation speed of the high-speed centrifugal separation is 8000-10000 rpm, and the time is 10-15 min.

[0029] As a preferred technical solution of the present invention, in step 2, the freeze-drying temperature is -40°C, and the drying time is 24 to 48 hours.

[0030] As a preferred technical solution of the present invention, in step three, the freeze-drying temperature is -40°C and the drying time is 36 to 48 hours.

[0031] Nano zinc alginate itself can enhance digestion and absorption. The seaweed polysaccharides and other ingredients in zinc alginate can enhance the growth of intestinal villi and improve the digestion and absorption capacity of the intestine, which helps pets better absorb and utilize the nutrients in freeze-dried food. Zinc alginate can also regulate the balance of intestinal flora, promote the growth of beneficial bacteria, and inhibit the reproduction of harmful bacteria.

[0032] Zinc alginate has strong hydrophilicity and water retention capacity, and can form a protective film in freeze-dried food. This protective film can reduce water evaporation, improve the rehydration of food, and enable pets to restore the original taste and texture of food more quickly when eating. By improving the rehydration of food, zinc alginate can also promote the release and dissolution of nutrients in food, which helps pets better absorb and utilize these nutrients and improve the utilization rate of food.

[0033] As a small molecule active peptide, enzymatically hydrolyzed ovalbumin is easier for pets to digest and absorb than large molecule proteins. This can not only improve the utilization rate of protein for pets, but also ensure that pets obtain sufficient amino acids and other nutrients to meet their growth and development and daily activities.

[0034] After rehydration, the freeze-dried food may become tough and lack juice due to the denaturation of protein in the food and the change of arrangement and microstructure of muscle tissue fibers due to dehydration, which affects the palatability of the freeze-dried food. During the processing of enzymatic ovalbumin, it may produce rich meat aroma through Maillard reaction, etc. These aroma substances can enhance the flavor of pet food and increase the appetite and palatability of pets. Therefore, modified nano zinc alginate can not only help freeze-dried food maintain excellent rehydration, but also improve palatability.

[0035] Polyglutamic acid molecules contain a large number of hydrophilic groups, such as carboxyl groups, which can form hydrogen bonds with water molecules, thereby retaining a large amount of water. In the present invention, green tea extract, licorice extract and yam extract are mixed by ball milling and then sieved with polyglutamic acid aqueous solution. After drying, a thin film can be formed on the surface of the plant extract. This film has a water-retaining effect, can reduce water evaporation, thereby improving the rehydration of the plant extract, and can also protect the active ingredients of the plant extract.

[0036] Beneficial effects of the present invention:

[0037] The present invention improves the rehydration and palatability of pet freeze-dried food by adding modified nano zinc alginate and polyglutamic acid treated plant extracts to the traditional formula, and provides comprehensive nutrition for pets through the coordination of various substances. In addition, during the process of the present invention, liquid carbon dioxide is introduced during the stirring process to lock the moisture of various components in advance, and then further freeze-drying and sterilization are performed to obtain a pet freeze-dried food with high rehydration. DETAILED DESCRIPTION

[0038] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0039] In the following examples and comparative examples, the oils and fats are lecithin and modified soybean lecithin in a mass ratio of 1:1.

[0040] Example 1

[0041] S1. Prepare mixed material:

[0042] S1.1, by weight, 30 parts of chicken, 5 parts of chicken hearts, 2 parts of salmon, and 1 part of fat were mixed, tumbled, and then minced with a meat grinder to obtain minced meat, thereby obtaining a mixture A;

[0043] S1.2, placing mixture A in a vacuum mixer, introducing liquid carbon dioxide gas, and continuing to add 3 parts of pumpkin, 1 part of modified nano zinc alginate, 2 parts of trehalose, 0.5 parts of prebiotics and 3 parts of citric acid, and mixing at a speed of 600 r / min for 2 h to obtain mixture B;

[0044] The preparation process of the modified nano zinc alginate is as follows:

[0045] Step 1, dissolving sodium alginate in purified water, stirring at a speed of 500 r / min for 0.5 h, and then slowly adding zinc chloride, wherein the molar ratio of sodium alginate to zinc chloride is 2:1, and stirring at the same speed for 3 h to obtain a first mixed solution;

[0046] Step 2: subjecting the first mixed solution to high-speed centrifugation at a speed of 8000 rpm for 10 min, washing the separated solid with purified water for 3 times, and then freeze-drying at a temperature of -40°C for 24 h to obtain nano zinc alginate;

[0047] Step 3: Evenly mix 10 parts of egg white protein with 200 parts of distilled water, heat to 45°C, add 0.5 parts of papain, and perform enzymolysis at a constant temperature for 10 hours under stirring to obtain an enzymolysis mixture. Evenly mix the nano zinc alginate with a mass ratio of 1:5 with the enzymolysis mixture under stirring, stir at room temperature at a speed of 400 r / min for 18 hours, centrifuge at a speed of 10000 rpm for 15 minutes after the stirring, separate the obtained solid and freeze-dry it at a temperature of -40°C for 36 hours. The obtained solid is ball-milled at a speed of 400 r / min for 3 hours and then passed through a 200-mesh sieve to obtain modified nano zinc alginate.

[0048] S1.3, mixing mixture B and 1 portion of the plant extract at a constant speed for 2 h to obtain a mixture;

[0049] The preparation process of the plant extract is as follows:

[0050] 0.1 parts of green tea extract, 0.1 parts of licorice extract and 0.1 parts of yam extract were mixed, ground by a ball mill at a speed of 400 r / min for 2 hours, added to 20 parts of a 5% polyglutamic acid aqueous solution, stirred at a speed of 500 r / min for 50 minutes, and spray-dried to obtain the plant extract;

[0051] S2. Freeze-drying:

[0052] The mixed material is vacuum frozen at -50°C and 1Pa for 20 hours, and the frozen product is placed in a dicer to form block particles;

[0053] S3. Pasteurization:

[0054] The block particles are placed in a pasteurization device, the temperature is set at 68° C., the treatment is continued for 15 seconds, and then immediately cooled to 30° C. to prepare the highly rehydratable pet freeze-dried food.

[0055] Example 2

[0056] S1. Preparation of mixed materials:

[0057] S1.1, by weight, 35 parts of chicken, 8 parts of chicken hearts, 3 parts of salmon, and 1.7 parts of fat were mixed, tumbled, and then minced with a meat grinder to obtain minced meat, thereby obtaining a mixture A;

[0058] S1.2, placing mixture A in a vacuum mixer, introducing liquid carbon dioxide gas, and continuing to add 4 parts of pumpkin, 1.5 parts of modified nano zinc alginate, 3 parts of trehalose, 0.6 parts of prebiotics and 4 parts of citric acid, and mixing at a speed of 600 r / min for 2 h to obtain mixture B;

[0059] The preparation process of the modified nano zinc alginate is as follows:

[0060] Step 1, dissolving sodium alginate in purified water, stirring at a speed of 500 r / min for 0.7 h, and then slowly adding zinc chloride, wherein the molar ratio of sodium alginate to zinc chloride is 2:1, and stirring at the same speed for 3.5 h to obtain a first mixed solution;

[0061] Step 2: subjecting the first mixed solution to high-speed centrifugation at a speed of 9000 rpm for 12 min, washing the separated solid with purified water for 3 times, and then freeze-drying at a temperature of -40°C for 32 h to obtain nano zinc alginate;

[0062] Step 3: Evenly mix 10 parts of egg white protein with 200 parts of distilled water, heat to 50°C, add 0.7 parts of papain, and perform enzymolysis at a constant temperature for 13 hours under stirring to obtain an enzymolysis mixture. Evenly mix the nano zinc alginate with a mass ratio of 1:5 with the enzymolysis mixture under stirring, stir at room temperature at a speed of 400 r / min for 20 hours, centrifuge at a speed of 11000 rpm for 18 minutes after the stirring, separate the obtained solid and freeze-dry it at a temperature of -40°C for 42 hours. The obtained solid is ball-milled at a speed of 400 r / min for 3 hours and then passed through a 200-mesh sieve to obtain modified nano zinc alginate.

[0063] S1.3, mixing mixture B and 1.5 parts of plant extract at the same speed for 2 hours to obtain a mixture;

[0064] The preparation process of the plant extract is as follows:

[0065] 0.16 parts of green tea extract, 0.15 parts of licorice extract and 0.2 parts of yam extract were mixed, ground by a ball mill at a speed of 400 r / min for 2 hours, added to 25 parts of 8% polyglutamic acid aqueous solution, stirred at a speed of 500 r / min for 50 minutes, and spray-dried to obtain the plant extract;

[0066] S2. Freeze-drying:

[0067] Freeze the mixture at -40°C and 1.5 Pa for 24 hours, and put the frozen product into a dicer to make block particles.

[0068] S3. Pasteurization:

[0069] The block particles are placed in a pasteurization device, the temperature is set at 70° C., the treatment is continued for 20 seconds, and then immediately cooled to 33° C. to prepare the highly rehydratable pet freeze-dried food.

[0070] Example 3

[0071] S1. Preparation of mixed materials:

[0072] S1.1, by weight, 40 parts of chicken, 10 parts of chicken hearts, 4 parts of salmon, and 2 parts of fat were mixed, tumbled, and then minced with a meat grinder to obtain minced meat, thereby obtaining a mixture A;

[0073] S1.2, placing mixture A in a vacuum mixer, introducing liquid carbon dioxide gas, and continuing to add 5 parts of pumpkin, 2 parts of modified nano zinc alginate, 4 parts of trehalose, 1 part of prebiotics and 6 parts of citric acid, and mixing at a speed of 600 r / min for 2 h to obtain mixture B;

[0074] The preparation process of the modified nano zinc alginate is as follows:

[0075] Step 1, dissolving sodium alginate in purified water, stirring at a speed of 500 r / min for 1 hour, and then slowly adding zinc chloride, wherein the molar ratio of sodium alginate to zinc chloride is 2:1, and stirring at the same speed for 4 hours to obtain a first mixed solution;

[0076] Step 2: subjecting the first mixed solution to high-speed centrifugation at a speed of 10,000 rpm for 15 minutes, washing the separated solid with purified water for 3 times, and then freeze-drying at a temperature of -40°C for 48 hours to obtain nano zinc alginate;

[0077] Step 3: Evenly mix 10 parts of egg white protein with 200 parts of distilled water, heat to 60°C, add 1 part of papain, and perform enzymolysis at a constant temperature for 15 hours under stirring to obtain an enzymolysis mixture. Evenly mix the nano zinc alginate with a mass ratio of 1:5 with the enzymolysis mixture under stirring, stir at room temperature at a speed of 400 r / min for 24 hours, centrifuge at a speed of 12000 rpm for 20 minutes after the stirring, separate the obtained solid and freeze-dry it at a temperature of -40°C for 48 hours. The obtained solid is ball-milled at a speed of 400 r / min for 3 hours and then passed through a 200-mesh sieve to obtain modified nano zinc alginate.

[0078] S1.3, mixing mixture B and 2 parts of plant extracts at the same speed for 2 hours to obtain a mixture;

[0079] The preparation process of the plant extract is as follows:

[0080] 0.3 parts of green tea extract, 0.3 parts of licorice extract and 0.3 parts of yam extract were mixed, ground by a ball mill at a speed of 400 r / min for 2 hours, added to 30 parts of a 10% polyglutamic acid aqueous solution, stirred at a speed of 500 r / min for 50 minutes, and spray-dried to obtain the plant extract;

[0081] S2. Freeze-drying:

[0082] Freeze the mixture at -30°C and 2Pa for 30 hours, and put the frozen product into a dicer to make block particles.

[0083] S3. Pasteurization:

[0084] The block particles are placed in a pasteurization device, the temperature is set at 72° C., the treatment is continued for 25 seconds, and then immediately cooled to 35° C. to prepare the highly rehydratable pet freeze-dried food.

[0085] Comparative Example 1

[0086] The difference between Comparative Example 1 and Example 1 is that the plant extract in Comparative Example 1 is not treated with polyglutamic acid, and the other operations are the same.

[0087] Comparative Example 2

[0088] The difference between Comparative Example 2 and Example 1 is that modified nano zinc alginate is not added in Comparative Example 2, and the other operations are the same.

[0089] Comparative Example 3

[0090] The difference between Comparative Example 3 and Example 1 is that the nano zinc alginate in Comparative Example 3 is not processed by step 3, and the other operations are the same.

[0091] Performance Test:

[0092] 1. Rehydration:

[0093] Weigh 5 g of the freeze-dried food prepared in Example 1-3 and Comparative Example 1-2, record the mass m0, add 500 g of 90°C water, keep warm in a 90°C water bath, take out for 3 minutes, drain the water, weigh and record the mass m1, rehydration ratio = m1 / m0, the larger the rehydration ratio, the better the rehydration property. The results are shown in Table 1:

[0094] Table 1

[0095] Group Rehydration ratio Example 1 3.6 Example 2 3.3 Example 3 3.9 Comparative Example 1 2.6 Comparative Example 2 2.4

[0096] 2. Palatability test

[0097] Experimental method: 12 cats aged 2-3 were selected and divided into 4 groups, 3 in each group. Each cat was fed 100 g of freeze-dried food prepared in Examples 1-3 and Comparative Example 3 every day. The amount of leftover food in the pet cats within 6 hours was measured. The test period was 5 days, and the feeding rate of each group of pet cats was calculated and the average value was calculated. Feeding rate (portion) = (feeding amount - leftover food amount) / feeding amount × 100. The feeding rate reflects the palatability of the pet cats. The results are shown in Table 2 below:

[0098] Table 2

[0099] Group Average feed intake / portion Example 1 89.2 Example 2 88.3 Example 3 86.9 Comparative Example 3 78.3

[0100] According to the above data, the freeze-dried food prepared by the present invention has excellent rehydration properties.

[0101] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A preparation process of a highly rehydrating pet freeze-dried food, characterized in that: The method comprises the following preparation steps: S1. Preparation of mixed materials: S1.

1. Mix 30-40 parts of meat, 5-10 parts of viscera, 2-4 parts of salmon, and 1-2 parts of fat by weight, tumble and knead, and then grind them with a meat grinder to obtain minced meat, thereby obtaining a mixture A; S1.2, placing mixture A in a vacuum mixer, introducing liquid carbon dioxide gas, and continuing to add 3-5 parts of fruits and vegetables, 1-2 parts of modified nano zinc alginate, 2-4 parts of trehalose, 0.5-1 part of prebiotics and 3-6 parts of citric acid, and mixing at a speed of 600 r / min for 2 hours to obtain mixture B; S1.3, mixing mixture B and 1-2 parts of plant extracts with stirring for 2 hours at a constant speed to obtain a mixture; The preparation process of the plant extract is as follows: 0.1-0.3 parts of green tea extract, 0.1-0.3 parts of licorice extract and 0.1-0.3 parts of yam extract are mixed, ground by a ball mill at a speed of 400 r / min for 2 hours, added to 20-30 parts of an aqueous solution of polyglutamic acid, stirred at a speed of 500 r / min for 50 minutes, and spray-dried to obtain the plant extract; S2. Freeze-drying: Freeze the mixture at -50 to -30°C and a vacuum degree of 1 to 2 Pa for 20 to 30 hours, and put the frozen product into a dicer to make block particles; S3. Pasteurization: The block particles are placed in a pasteurization device, the temperature is set at 68-72° C., the treatment is continued for 15-25 seconds, and then immediately cooled to 30-35° C. to prepare the highly rehydratable pet freeze-dried food.

2. The preparation process of a highly rehydrating pet freeze-dried food according to claim 1, characterized in that: In step S1.1, the oil is lecithin and modified soybean lecithin in a mass ratio of 1:

1.

3. The preparation process of a highly rehydrating pet freeze-dried food according to claim 1, characterized in that: In step S1.1, the meat is one of rabbit meat, chicken, beef, pigeon meat and venison.

4. The preparation process of a highly rehydrating pet freeze-dried food according to claim 1, characterized in that: In step S1.1, the viscera are one or more of pigeon heart, pigeon liver, rabbit heart, rabbit liver, ox heart, ox liver, chicken heart and chicken liver.

5. The preparation process of a highly rehydrating pet freeze-dried food according to claim 1, characterized in that: In step S1.2, the preparation process of the modified nano zinc alginate is as follows: Step 1, dissolving sodium alginate in purified water, stirring at a speed of 500 r / min for 0.5 to 1 h, and then slowly adding zinc chloride, wherein the molar ratio of sodium alginate to zinc chloride is 2:1, and maintaining the speed and stirring for 3 to 4 h to obtain a first mixed solution; Step 2, subjecting the first mixed solution to high-speed centrifugal separation, washing the separated solid with purified water for 3 times and then freeze-drying it to obtain nano zinc alginate; Step 3, 10 parts of egg white protein and 200 parts of distilled water are uniformly mixed, the temperature is raised to 45-60°C, 0.5-1 part of papain is added, and constant temperature enzymolysis is performed for 10-15 hours under stirring conditions to obtain an enzymolysis mixture, and nano-zinc alginate with a mass ratio of 1:5 is uniformly mixed with the enzymolysis mixture under stirring, and stirred at a speed of 400r / min for 18-24h at room temperature. After the stirring is completed, centrifuge at a speed of 10000-12000rpm for 15-20min, separate the obtained solid and freeze-dry it, and the obtained solid is ball-milled at a speed of 400r / min for 3h in a ball mill and then passed through a 200-mesh sieve to obtain modified nano-zinc alginate.

6. The process for preparing a highly rehydrating pet freeze-dried food according to claim 1, characterized in that: In step S1.2, the fruits and vegetables are one or more of pumpkin, carrot, cucumber and rosemary.

7. The process for preparing a highly rehydrating pet freeze-dried food according to claim 1, characterized in that: In step S1.3, the polyglutamic acid aqueous solution is a polyglutamic acid aqueous solution with a mass fraction of 5 to 10%.

8. The process for preparing a highly rehydrating pet freeze-dried food according to claim 5, characterized in that: In step 2, the rotation speed of the high-speed centrifugal separation is 8000-10000 rpm, and the time is 10-15 min.

9. The process for preparing a highly rehydrating pet freeze-dried food according to claim 5, characterized in that: In step 2, the freeze-drying temperature is -40°C and the drying time is 24 to 48 hours.

10. The process for preparing a highly rehydrating pet freeze-dried food according to claim 5, characterized in that: In step three, the freeze-drying temperature is -40°C and the drying time is 36 to 48 hours.