阅读说明：本技术 一种冻干燕窝及其加工工艺 (Freeze-dried edible bird's nest and processing technology thereof ) 是由 刘贺 于 2021-07-16 设计创作，主要内容包括：本申请涉及冻干食品的技术领域,尤其是涉及一种冻干燕窝及其加工工艺,冻干燕窝的加工工艺包括如下加工步骤：对新鲜燕窝进行清洗、泡发、脱水；蒸制：将脱水后的燕窝于80-100℃下蒸制2-5min,冷却至23±2℃,得湿燕窝；冻干：将上述湿燕窝在0.5±0.2Pa的绝对真空度下,于-50～20℃下冻干至水分含量不大于3%,即得冻干燕窝。本申请加工的冻干燕窝,食用前热水浸泡5min左右即可食用,食用方便,且营养成分较高,细腻爽滑,绵软有弹性,口感较佳。(The application relates to the technical field of freeze-dried food, in particular to a freeze-dried cubilose and a processing technology thereof, wherein the processing technology of the freeze-dried cubilose comprises the following processing steps: cleaning, soaking and dehydrating fresh cubilose; steaming: steaming dehydrated nidus Collocaliae at 80-100 deg.C for 2-5min, and cooling to 23 + -2 deg.C to obtain wet nidus Collocaliae; freeze-drying: and (3) freeze-drying the wet cubilose at-50-20 ℃ under the absolute vacuum degree of 0.5 +/-0.2 Pa until the water content is not more than 3%, thus obtaining the freeze-dried cubilose. The freeze-dried edible bird's nest processed by the method can be eaten after being soaked in hot water for about 5min before being eaten, is convenient to eat, and has high nutrient content, fineness, smoothness, softness, elasticity and better mouthfeel.)

1. The processing technology of the freeze-dried cubilose is characterized by comprising the following processing steps:

cleaning, soaking and dehydrating fresh cubilose;

steaming: steaming dehydrated nidus Collocaliae at 80-100 deg.C for 2-5min, and cooling to 23 + -2 deg.C to obtain wet nidus Collocaliae;

freeze-drying: and (3) freeze-drying the wet cubilose at-50-20 ℃ under the absolute vacuum degree of 0.5 +/-0.2 Pa until the water content is not more than 3%, thus obtaining the freeze-dried cubilose.

2. The processing technology of the freeze-dried cubilose according to claim 1, characterized in that: in the step of foaming, foaming liquid is adopted for foaming, and the weight ratio of the foaming liquid to the fresh edible bird's nest is (3-5): 1.

3. the processing technology of the freeze-dried cubilose according to claim 2, characterized in that: the foaming liquid is purified water.

4. The processing technology of the freeze-dried cubilose according to claim 1, wherein the freeze-drying step is implemented by the following specific operations: freezing the wet cubilose at-50 to-5 ℃ for 17 to 25.5 hours under the absolute vacuum degree of 0.5 +/-0.2 Pa, and drying at 0 to 20 ℃ for 8 to 13 hours to ensure that the water content in the cubilose is not more than 3 percent, thus obtaining the freeze-dried cubilose.

5. The processing technology of the freeze-dried cubilose according to claim 4, wherein the freeze-drying step is implemented by the following specific operations: freezing the above wet nidus Collocaliae at-50 deg.C for 5-6h at-45 deg.C, -40 deg.C and-35 deg.C for 2-3h at-30 deg.C, -25 deg.C and-20 deg.C for 1-2h at-15 deg.C, -10 deg.C and-5 deg.C respectively, drying at 0 deg.C, 5 deg.C and 10 deg.C for 2-3h, and drying at 15 deg.C and 20 deg.C for 1-2h respectively to make water content in nidus Collocaliae less than 3% to obtain lyophilized nidus Collocaliae.

6. The processing technology of the freeze-dried cubilose according to claim 2, wherein the foaming liquid is prepared from the following raw materials in percentage by weight: 3-5% of carotene, 1-3% of pectin, 1-3% of nicotinic acid and pure water, and the balance is made to 100%.

7. The processing technology of the freeze-dried cubilose according to claim 6, characterized in that: the freeze-drying step comprises the following specific operations: freezing the wet cubilose for 8-15h at-50 to-5 ℃ under the absolute vacuum degree of 0.5 +/-0.2 Pa, and drying for 5-8h at 0-20 ℃ to ensure that the water content in the cubilose is not more than 3 percent, thus obtaining the freeze-dried cubilose.

8. The processing technology of the freeze-dried cubilose according to claim 7, wherein the freeze-drying step is implemented by the following specific operations: freezing the above wet nidus Collocaliae at-50 deg.C for 2-3h at-45 deg.C, -40 deg.C and-35 deg.C under absolute vacuum degree of 0.5 + -0.2 Pa, respectively freezing at-30 deg.C, -25 deg.C and-20 deg.C for 0.5-1h, respectively freezing at-15 deg.C, -10 deg.C and-5 deg.C for 0.5-1h, respectively drying at 0 deg.C, 5 deg.C and 10 deg.C for 1-2h, respectively drying at 15 deg.C and 20 deg.C for 1-2h, and making water content in nidus Collocaliae not greater than 3% to obtain lyophilized nidus Collocaliae.

9. A freeze-dried edible bird's nest processed by the processing technology of any one of claims 1-8.

10. The freeze-dried edible bird's nest of claim 9, characterized in that the eating method is as follows: soaking in 85-100 deg.C water for 3-8 min.

Technical Field

The application relates to the technical field of freeze-dried foods, in particular to a freeze-dried cubilose and a processing technology thereof.

Background

The nidus Collocaliae is nidus hole formed by mixing saliva secreted by Swallow pectinifera and several swiftlets of the genus Potiria with other substances, and is also called swallow vegetable, swallow root, and swallow vegetable. The main nutrient components of the cubilose are protein, wherein the protein comprises 1 amino acid essential to human bodies and 3 conditionally essential amino acids, and the cubilose also contains abundant saccharides, organic acids and sialic acid, and belongs to nourishing food.

The cooking method of the fresh cubilose comprises the following specific steps: taking fresh edible bird's nest, pouring clear water to soak for 4-5 h; tearing the edible bird's nest after soaking, and picking and removing impurities such as fine hair and the like; washing with clear water, draining, adding purified water or mineral water to submerge nidus Collocaliae, and stewing over water for 25-30 min. The cooked nidus Collocaliae has strong protein taste and high elasticity. However, the steps of cooking the fresh edible bird's nest are complex, the time consumption is long, and the edible bird's nest is inconvenient to eat.

Disclosure of Invention

In order to solve the problem that fresh cubilose is inconvenient to eat due to complex cooking operation and long time consumption, the application provides the freeze-dried cubilose and the processing technology thereof.

In a first aspect, the application provides a processing technology of freeze-dried cubilose, which adopts the following technical scheme:

a processing technology of freeze-dried edible bird's nest comprises the following processing steps:

cleaning, soaking and dehydrating fresh cubilose;

steaming: steaming dehydrated nidus Collocaliae at 80-100 deg.C for 2-5min, and cooling to 23 + -2 deg.C to obtain wet nidus Collocaliae;

freeze-drying: and (3) freeze-drying the wet cubilose at-50-20 ℃ under the absolute vacuum degree of 0.5 +/-0.2 Pa until the water content is not more than 3%, thus obtaining the freeze-dried cubilose.

By adopting the technical scheme, the fresh cubilose is processed in advance, and impurities such as fine hair and the like are removed by cleaning and soaking; removing most of water absorbed when the bird's nest is soaked and foamed by dehydration; cooking fresh nidus Collocaliae from raw to cooked; then, removing water in the cubilose by a low-temperature freeze-drying mode in a sublimation mode, drying the cubilose in a frozen state, and drying to obtain a water content of not more than 3%; in the low-temperature freeze-drying process, the structure of the edible bird's nest cannot be damaged, the solid components of the edible bird's nest are supported by the ice on the position of the edible bird's nest, and pores are left in the edible bird's nest after the ice is sublimated, so that the freeze-dried edible bird's nest is loose and porous, and the nutritional components are still reserved. When eating, only water is needed for soaking, and the freeze-dried edible bird's nest is loose and porous, so the freeze-dried edible bird's nest can be soaked in hot water for 3-8min for eating.

Preferably, the method comprises the following steps: in the step of foaming, foaming liquid is adopted for foaming, and the weight ratio of the foaming liquid to the fresh edible bird's nest is (3-5): 1.

by adopting the technical scheme, the fresh edible bird's nest is fully soaked, and impurities such as fine hairiness on the edible bird's nest can be conveniently picked and removed.

Preferably, the method comprises the following steps: the foaming liquid is purified water.

Preferably, the method comprises the following steps: the freeze-drying step comprises the following specific operations: freezing the wet cubilose at-50 to-5 ℃ for 17 to 25.5 hours under the absolute vacuum degree of 0.5 +/-0.2 Pa, and drying at 0 to 20 ℃ for 8 to 13 hours to ensure that the water content in the cubilose is not more than 3 percent, thus obtaining the freeze-dried cubilose.

Preferably, the freeze-drying step comprises the following specific operations: and (3) gradually heating and freezing the wet cubilose for 17-25.5h at the temperature rise speed of 10 ℃/time or 5 ℃/time under the absolute vacuum degree of 0.5 +/-0.2 Pa and at the temperature of-50-5 ℃, and gradually heating and drying for 8-13h at the temperature rise speed of 10 ℃/time or 5 ℃/time at the temperature of 0-20 ℃ to ensure that the water content in the cubilose is not more than 3 percent, thus obtaining the freeze-dried cubilose.

Preferably, the freeze-drying step comprises the following specific operations: and (3) gradually heating and freezing the wet cubilose for 17-25.5h at the temperature rise speed of 5 ℃/time under the absolute vacuum degree of 0.5 +/-0.2 Pa and at the temperature of-50-5 ℃, and gradually heating and drying for 8-13h at the temperature rise speed of 5 ℃/time and at the temperature of 0-20 ℃ to ensure that the moisture content in the cubilose is not more than 3 percent, thus obtaining the freeze-dried cubilose.

By adopting the technical scheme, the wet cubilose containing more moisture is subjected to vacuum cooling and freezing, and then is dried under the freezing condition, so that the moisture in the cubilose is directly sublimated, and the freeze-dried cubilose with low water content is obtained.

Preferably, the method comprises the following steps: the freeze-drying step comprises the following specific operations: freezing the above wet nidus Collocaliae at-50 deg.C for 5-6h at-45 deg.C, -40 deg.C and-35 deg.C for 2-3h at-30 deg.C, -25 deg.C and-20 deg.C for 1-2h at-15 deg.C, -10 deg.C and-5 deg.C respectively, drying at 0 deg.C, 5 deg.C and 10 deg.C for 2-3h, and drying at 15 deg.C and 20 deg.C for 1-2h respectively to make water content in nidus Collocaliae less than 3% to obtain lyophilized nidus Collocaliae.

By adopting the technical scheme, through gradually heating up and freeze-drying, and controlling the freeze-drying time at each freeze-drying temperature, the water vapor in the cubilose can smoothly escape, and the freeze-drying operation of the wet cubilose is realized.

Preferably, the method comprises the following steps: the foaming liquid is prepared from the following raw materials in percentage by weight: 3-5% of carotene, 1-3% of pectin, 1-3% of nicotinic acid and pure water, and the balance is made to 100%.

Preferably, the method comprises the following steps: the pectin is high ester pectin, and the carotene is one or more of alpha-carotene, beta-carotene, and gamma-carotene, preferably beta-carotene.

Through adopting above-mentioned technical scheme, high ester pectin water-solubility is better, can be better dissolve, and it can wrap up in the edible bird's nest surface at the freeze-drying in-process in soaking the in-process, and migration to the surface leads to freeze-drying edible bird's nest local atrophy after avoiding slightly soluble material crystallization, improves freeze-drying effect.

Preferably, the method comprises the following steps: the freeze-drying step comprises the following specific operations: freezing the wet cubilose for 8-15h at-50 to-5 ℃ under the absolute vacuum degree of 0.5 +/-0.2 Pa, and drying for 5-8h at 0-20 ℃ to ensure that the water content in the cubilose is not more than 3 percent, thus obtaining the freeze-dried cubilose.

Preferably, the freeze-drying step comprises the following specific operations: and (3) gradually heating and freezing the wet cubilose for 8-15h at the temperature rise speed of 10 ℃/time or 5 ℃/time under the absolute vacuum degree of 0.5 +/-0.2 Pa and at the temperature of-50-5 ℃, and gradually heating and drying for 5-8h at the temperature rise speed of 10 ℃/time or 5 ℃/time at the temperature of 0-20 ℃ to ensure that the water content in the cubilose is not more than 3 percent, thus obtaining the freeze-dried cubilose.

Preferably, the freeze-drying step comprises the following specific operations: and (3) gradually heating and freezing the wet bird's nest for 8-15h at the temperature rise speed of 5 ℃/time under the absolute vacuum degree of 0.5 +/-0.2 Pa and at the temperature of-50 to-5 ℃, and gradually heating and drying for 5-8h at the temperature rise speed of 5 ℃/time and at the temperature of 0-20 ℃ to ensure that the moisture content in the bird's nest is not more than 3 percent, thus obtaining the freeze-dried bird's nest.

Preferably, the method comprises the following steps: the freeze-drying step comprises the following specific operations: freezing the above wet nidus Collocaliae at-50 deg.C for 2-3h at-45 deg.C, -40 deg.C and-35 deg.C under absolute vacuum degree of 0.5 + -0.2 Pa, respectively freezing at-30 deg.C, -25 deg.C and-20 deg.C for 0.5-1h, respectively freezing at-15 deg.C, -10 deg.C and-5 deg.C for 0.5-1h, respectively drying at 0 deg.C, 5 deg.C and 10 deg.C for 1-2h, respectively drying at 15 deg.C and 20 deg.C for 1-2h, and making water content in nidus Collocaliae not greater than 3% to obtain lyophilized nidus Collocaliae.

By adopting the technical scheme, the freeze-drying time can be relatively shortened under the condition of ensuring the freeze-drying effect by adding a proper amount of carotene, pectin and nicotinic acid into the purified water.

In a second aspect, the application provides a freeze-dried edible bird's nest processed by any one of the processing techniques, and the edible method comprises the following steps: soaking in 85-100 deg.C water for 3-8 min.

By adopting the technical scheme, the fresh cubilose is processed into the freeze-dried cubilose by the process, and the fresh cubilose can be directly brewed with hot water for about 5min when being eaten, so that the edible cubilose is more convenient to eat.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the freeze-dried edible bird's nest processed by the method can be eaten after being soaked in hot water for about 5min before being eaten, and is convenient to eat;

2. the freeze-dried edible bird's nest processed by the processing technology has a good freeze-drying effect; the content of nitrite in the freeze-dried edible bird's nest is less than 30mg/kg, the highest content of protein can reach 49.19 percent, the highest total content of amino acid can reach 56.87 percent, the highest content of sialic acid can reach 10.10 percent, and the quality is excellent;

3. the freeze-dried edible bird's nest processed by the method has a filiform appearance, clear texture, transparent color and luster and slightly yellow; the bird's nest has the advantages of slight fishy smell, fineness, smoothness, softness and elasticity, and belongs to the bird's nest with excellent quality.

Detailed Description

The present application is described in further detail below with reference to specific contents.

Except for special instructions, the raw materials and chemical substances used in the application are all commercially available products, and specifically: the nidus Collocaliae is selected from Malaysia or Indonesia, and is of type Adonis; the pectin is selected from food-grade high ester pectin of Shandong Zhenghong biotechnology, and has effective substance content of 99%; both carotene and niacin are food grade commercial products.

Example 1

A freeze-dried cubilose is obtained by processing the following steps:

removing impurities: primarily removing impurities from fresh edible bird's nest, and picking and removing the edible bird's hair on the fresh edible bird's nest;

cleaning, soaking and dehydrating: repeatedly cleaning fresh edible bird's nest with clear water for 3 times, adding foaming liquid into 400g of cleaned fresh edible bird's nest for foaming, wherein the weight ratio of the foaming liquid to the fresh edible bird's nest is 5:1, the foaming liquid is purified water, and the foaming time is 2.5 h; tearing open the soaked fresh bird's nest according to the lines, filtering for 3 times by using purified water, and filtering most of villi of the fresh bird's nest; picking again to remove the bird's nest hair, and then transferring into a centrifugal dehydrator for spin-drying for 10 min;

steaming: steaming the dehydrated edible bird's nest at 80 deg.C for 4min, and cooling to 23 + -2 deg.C to obtain wet edible bird's nest;

freeze-drying: filling the above wet nidus Collocaliae into a mold, freezing at-50 deg.C for 5h at-40 deg.C for 6h at-30 deg.C and-20 deg.C for 3h respectively, freezing at-10 deg.C and-5 deg.C for 1.5h respectively, drying at 0 deg.C and 10 deg.C for 3h respectively, and drying at 15 deg.C and 20 deg.C for 2h respectively under the absolute vacuum degree of 0.5 + -0.2 Pa to obtain lyophilized nidus Collocaliae.

Example 2

The freeze-dried edible bird's nest of example 2 is obtained by processing the following steps:

removing impurities: the same as example 1;

cleaning, soaking and dehydrating: the same as example 1;

steaming: the same as example 1;

freeze-drying: filling the above wet nidus Collocaliae into a mold, freezing at-50 deg.C for 5h at-45 deg.C, -40 deg.C and-35 deg.C for 2h at-30 deg.C and-20 deg.C for 1.5h at-15 deg.C and-5 deg.C for 1.5h at-5 deg.C respectively, drying at 0 deg.C, 5 deg.C and 10 deg.C for 2h respectively, and drying at 20 deg.C for 2h to make the water content in the nidus Collocaliae 3%, to obtain the final product.

Example 3

The freeze-dried edible bird's nest of example 3, which is obtained by processing the following steps:

removing impurities: the same as example 1;

cleaning, soaking and dehydrating: the same as example 1;

steaming: steaming dehydrated nidus Collocaliae at 100 deg.C for 2min, and cooling to 23 + -2 deg.C to obtain wet nidus Collocaliae;

freeze-drying: filling the wet bird's nest into a mold, freezing for 6h at-50 ℃, freezing for 3h at-45 ℃, freezing for 40 ℃ below zero and freezing for 2h at-35 ℃, freezing for 2h at-30 ℃, freezing for 25 ℃ below zero and freezing for 5h at-15 ℃, freezing for 10 ℃ below zero and freezing for 5h at-5 ℃, drying for 3h at 0 ℃, 5 ℃ and 10 ℃ respectively, and drying for 2h at 15 ℃ and 20 ℃ respectively under 0 ℃, 5 ℃ and 0.2Pa under the absolute vacuum degree of 0.5 +/-0.2 Pa, thus obtaining the freeze-dried bird's nest.

Example 4

The freeze-dried edible bird's nest of example 4 is obtained by processing the following steps:

removing impurities: the same as example 1;

cleaning, soaking and dehydrating: the same as example 1;

steaming: steaming the dehydrated edible bird's nest at 80 deg.C for 2min, and cooling to 23 + -2 deg.C to obtain wet edible bird's nest;

freeze-drying: filling the wet cubilose into a mold, freezing for 5h at-50 ℃, freezing for 2h at-45 ℃, freezing for-40 ℃ and freezing for-35 ℃ respectively for 2h at-30 ℃, freezing for 1h at-25 ℃ and freezing for-20 ℃ respectively for-15 ℃, freezing for 1h at-10 ℃ and freezing for-5 ℃, drying for 2h at 0 ℃, 5 ℃ and 10 ℃ respectively, and drying for 1h at 15 ℃ and 20 ℃ respectively under 0 ℃, 5 ℃ and 0.2Pa in absolute vacuum degree to ensure that the water content in the cubilose is 3 percent, thus obtaining the freeze-dried cubilose.

Example 5

The freeze-dried edible bird's nest of example 5, which is obtained by processing the following steps:

removing impurities: the same as example 1;

cleaning, soaking and dehydrating: repeatedly cleaning fresh edible bird's nest with clear water for 3 times, adding foaming liquid into 400g of cleaned fresh edible bird's nest for foaming, wherein the weight ratio of the foaming liquid to the fresh edible bird's nest is 4:1, and the specific composition of the foaming liquid is shown in table 1; the specific preparation method of the foaming liquid comprises the following steps: adding pectin into purified water under stirring, adding nicotinic acid and carotene, and stirring; the foaming time is 2 h; tearing open the soaked fresh bird's nest according to the lines, filtering for 3 times by using purified water, and filtering most of villi of the fresh bird's nest; picking again to remove the bird's nest hair, and then transferring into a centrifugal dehydrator for spin-drying for 10 min;

steaming: the same as example 1;

freeze-drying: filling the above wet nidus Collocaliae into a mold, freezing at-50 deg.C for 5h at-40 deg.C for 4h at-30 deg.C and-20 deg.C for 2h at-10 deg.C and-5 deg.C respectively, drying at 0 deg.C and 10 deg.C for 1.5h, and drying at 15 deg.C and 20 deg.C for 1.5h respectively to make water content in nidus Collocaliae 2.9% to obtain lyophilized nidus Collocaliae.

Example 6

The freeze-dried edible bird's nest of example 6, which is obtained by processing the following steps:

removing impurities: the same as example 5;

cleaning, soaking and dehydrating: the same as example 5;

steaming: the same as example 5;

freeze-drying: filling the wet bird's nest into a mold, freezing for 3h at minus 50 ℃, freezing for 2h at minus 45 ℃, freezing for 40 ℃ and minus 35 ℃ respectively, freezing for 1h at minus 30 ℃, freezing for 25 ℃ and minus 20 ℃, freezing for 1h at minus 15 ℃, freezing for 10 ℃ and minus 5 ℃, drying for 2h at 0 ℃, 5 ℃ and 10 ℃ respectively, and drying for 1h at 15 ℃ and 20 ℃ respectively under 0 ℃, 5 ℃ and 10 ℃ respectively under the absolute vacuum degree of 0.5 +/-0.2 Pa, so that the moisture content in the bird's nest is 2.8 percent, and obtaining the freeze-dried bird's nest.

Examples 7 to 11

The freeze-dried edible bird's nest of examples 7-11, which was processed by the following steps:

removing impurities: the same as in example 6;

cleaning, soaking and dehydrating: the specific composition of the foam liquid is different from that of the example 6, and is shown in the table 1, and the rest is the same as that of the example 6;

steaming: the same as in example 6;

freeze-drying: and (5) as in example 6, making the water content in the cubilose not more than 3 percent to obtain the freeze-dried cubilose.

TABLE 1 raw Material compositions (unit g) of foaming liquids of examples 5 to 11

Example 12

The freeze-dried edible bird's nest of example 12, which is obtained by processing the following steps:

removing impurities: the same as in example 6;

cleaning, soaking and dehydrating: the same as in example 7;

steaming: the same as in example 6;

freeze-drying: filling the wet bird's nest into a mold, freezing for 2h at-50 ℃, freezing for 1h at-45 ℃, freezing for 1h at-40 ℃ and-35 ℃ respectively, freezing for 0.5h at-30 ℃, freezing for 0.5h at-15 ℃, freezing for 10 ℃ and-5 ℃ respectively, drying for 1h at 0 ℃, 5 ℃ and 10 ℃ respectively, and drying for 1h at 15 ℃ and 20 ℃ respectively under 0 ℃, 5 ℃ and 10 ℃ respectively under the absolute vacuum degree of 0.5 +/-0.2 Pa, so that the moisture content in the bird's nest is 2.7 percent, and thus obtaining the freeze-dried bird's nest.

Example 13

The freeze-dried edible bird's nest of example 13, which is obtained by processing the following steps:

removing impurities: the same as in example 6;

cleaning, soaking and dehydrating: repeatedly cleaning fresh edible bird's nest with clear water for 3 times, adding foaming liquid into 400g of cleaned fresh edible bird's nest for foaming, wherein the weight ratio of the foaming liquid to the fresh edible bird's nest is 3:1, the specific composition of the foaming liquid is the same as that in example 7, and the foaming time is 2 h; tearing open the soaked fresh bird's nest according to the lines, filtering for 3 times by using purified water, and filtering most of villi of the fresh bird's nest; picking again to remove the bird's nest hair, and then transferring into a centrifugal dehydrator for spin-drying for 10 min;

steaming: the same as in example 6;

freeze-drying: in the same way as in example 6, the water content in the bird's nest was adjusted to 2.8%, and thus the freeze-dried bird's nest was obtained.

Comparative example 1

A freeze-dried cubilose is obtained by processing the following steps:

removing impurities: the same as example 1;

cleaning, soaking and dehydrating: the same as example 1;

steaming: stewing dehydrated edible bird's nest in water of 80 deg.C for 4min, cooling to 23 + -2 deg.C to obtain wet edible bird's nest;

freeze-drying: in the same way as in example 1, the water content in the bird's nest is 3%, and the freeze-dried bird's nest is obtained.

Comparative example 2

A freeze-dried cubilose is obtained by processing the following steps:

removing impurities: the same as example 1;

cleaning, soaking and dehydrating: the same as example 1;

steaming: the same as example 1;

freeze-drying: filling the above wet nidus Collocaliae into mold, freezing at-50 deg.C for 18h, drying at 0 deg.C for 4h, and drying at 20 deg.C for 4h under absolute vacuum degree of 0.5 + -0.2 Pa to make water content in nidus Collocaliae be 3%, to obtain lyophilized nidus Collocaliae.

Comparative example 3

A freeze-dried cubilose is obtained by processing the following steps:

removing impurities: the same as example 1;

cleaning, soaking and dehydrating: the same as example 1;

steaming: the same as example 1;

freeze-drying: filling the above wet nidus Collocaliae into a mold, freezing at-50 deg.C for 8 hr at-20 deg.C for 10 hr under the absolute vacuum degree of 0.5 + -0.2 Pa, and drying at 20 deg.C for 8 hr to make the water content in nidus Collocaliae be 3% to obtain lyophilized nidus Collocaliae.

Performance detection

The time used for the freeze-drying steps of the freeze-dried edible bird nests of the examples 1-13 and the comparative examples 1-3 is counted, the surface atrophy phenomenon of the freeze-dried edible bird nests processed by the examples and the comparative examples is checked, 10 edible bird nests are randomly drawn for each group, and the specific results are shown in the table 2.

TABLE 2 Freeze-drying time and effect of freeze-dried nidus Collocaliae of examples 1-13 and comparative examples 1-3

	Freeze drying time/h	Freeze-drying effect
			Example 1	30	Atrophy of 2 animals
Example 2	25	Atrophy of 1 cup
			Example 3	38.5	No atrophy appeared
Example 4	25	No atrophy appeared
			Example 5	23	No atrophy appeared
Example 6	23	No atrophy appeared
			Example 7	23	No atrophy appeared
Example 8	23	No atrophy appeared
			Example 9	23	No atrophy appeared
Example 10	23	No atrophy appeared
			Example 11	23	No atrophy appeared
Example 12	13	No atrophy appeared
			Example 13	23	No atrophy appeared
Comparative example 1	30	Atrophy of 3 animals
			Comparative example 2	26	Atrophy of 5 animals
Comparative example 3	26	Atrophy of 4 animals

The detection results in the table 2 show that the freeze-drying effect of the freeze-dried edible bird's nest processed by the processing technology is relatively good. As can be seen from the results of the tests of examples 1 to 4 and comparative examples 2 to 3, the temperature increase rate during freeze-drying has a great influence on the freeze-drying effect of bird's nest in the freeze-drying step: when the temperature rising speed is 5 ℃/time, namely, in the examples 3 and 4, the bird's nest has excellent freeze-drying performance, and the surface does not shrink; when the temperature rising speed is 10 ℃/time, namely example 1 and example 2, the surface of a small amount of freeze-dried edible bird's nest is shrunk; when the temperature rise speed is more than 10 ℃/time, the larger the single temperature rise span is, the poorer the freeze-drying effect of the cubilose is, namely the freeze-drying effect of the comparative example 2 is poorer than that of the comparative example 3. Probably because the temperature rise speed is higher, the cubilose is frozen rapidly, but the temperature change in the cubilose is slower than that in the outside, so when the surface temperature of the cubilose rises sharply, the temperature rise in the cubilose is relatively delayed, the water in the cubilose cannot be sublimated in time after absorbing heat, partial slightly soluble substances are crystallized and separated out, and after freeze-drying, the parts where the slightly soluble substances are separated out are atrophied.

In order to solve the problem that the internal and external temperature of the cubilose is not synchronous during freeze drying, pectin, carotene and nicotinic acid are added into purified water as foaming liquid, and when the foaming liquid is used for foaming, fresh cubilose is soaked in the foaming liquid, and the nicotinic acid and part of the pectin with specific heat lower than that of water penetrate into the cubilose, so that the temperature change speed in the cubilose can be relatively increased; the other part of pectin carries carotene to be dispersed and coated on the surface of the cubilose, and has an inhibiting effect on the precipitation of slightly soluble substances. The detection results of the embodiment 5 and the embodiment 12 show that the freeze-drying effect can be improved by adding pectin, carotene and nicotinic acid into purified water as foaming liquid, so that the bird's nest is not shrunk under the condition that the single freeze-drying temperature is changed to 10 ℃ or the freeze-drying time is shortened, and the freeze-drying effect is improved. The test results of comparative example 1 show that if the steaming operation is replaced by stewing, the freeze-drying effect of the bird's nest is reduced.

The freeze-dried edible bird's nest of examples 1-13 and comparative examples 1-3 was subjected to composition testing by the following method, and the results are detailed in table 3: protein (%), total amount of amino acids (%): precisely weighing 115g of uniformly mixed sample powder by adopting an HPLC method, placing the sample powder into a hydrolysis tube, adding 10mL of 6mol/L hydrochloric acid, vacuumizing, charging nitrogen, sealing, placing the tube into a constant-temperature drying box at 110 ℃, hydrolyzing for 22h, taking out, and cooling to 23 ℃; transferring the hydrolysate to a 50mL volumetric flask, washing the hydrolytic flask with water, combining the hydrolytic flask with the volumetric flask, adding water to a constant volume, shaking up, sucking 110mL of the solution, and drying at 50 ℃ by using a vacuum drier; dissolving the residue with 1mL buffer solution with pH of 2.2 to obtain test solution; HPLC method according to JY/T0242-; sialic acid (%): detecting by using a detection method of GB/T30636-2014;

nitrite (mg/kg): the standard test of GB 5009.33-2016 is adopted, and the product is qualified when the content is less than or equal to 30 mg/kg.

TABLE 3 ingredient contents of lyophilized nidus Collocaliae of examples 1-13 and comparative examples 1-3

The detection results in table 3 show that the content of nitrite in the freeze-dried edible bird's nest is less than 30mg/kg, the content of protein is up to 49.19%, the total amount of amino acid is up to 56.87%, the content of sialic acid is up to 10.10%, and the freeze-dried edible bird's nest has excellent quality. The detection results of the examples 1-4 and the examples 5-12 show that the content of the nutrient components in the finished freeze-dried edible bird's nest can be improved by adding pectin, carotene and nicotinic acid into the foaming liquid before freeze-drying the fresh edible bird's nest. From the results of examples 6-8, it can be seen that the content of the nutritional components in the finished freeze-dried edible bird's nest increased and then decreased when the pectin content in the foaming liquid changed from low to high, and that the nutritional components in the freeze-dried edible bird's nest were relatively high when the pectin content was 2%. From the results of the tests in examples 7 and 11, it is clear that the types of carotene in the foaming liquid have an influence on the content of the nutritional ingredients in the final freeze-dried bird's nest, and may be related to the solubility of different carotenes in water. As can be seen from comparative example 1, when the fresh edible bird's nest is processed by stewing, the loss of the nutrient components in the edible bird's nest is large. As shown in comparative examples 2-3, the rapid freeze-drying method is not favorable for retaining the nutritional ingredients in the bird's nest.

The edible method of the freeze-dried edible bird's nest processed by the application comprises the following steps: soaking in 85-100 deg.C water for 3-8 min.

10 volunteers aged 10-20, 10 volunteers aged 20-35 and 10 volunteers aged 35-65 are respectively organized to take test eating, and all the volunteers do not have oral cavity, olfactory and gustatory diseases. 15 pieces of each of the freeze-dried bird's nests with atrophy in the examples 1 and 2, 15 pieces of each of the freeze-dried bird's nests in the examples 3 and 7, and 15 pieces of each of the freeze-dried bird's nests in the comparative examples 1 to 3 were taken, and added into hot water at 90 ℃ for soaking, and the mixture was eaten by each trial taker after 5 min. The trial eating mode is that each bird's nest is used for trial eating by two trial eaters, and the trial eating experience is shown in table 4.

TABLE 4 trial eating experience of different lyophilized bird's nests

As can be seen from Table 4, the freeze-dried edible bird's nest of the present application has a filiform appearance, clear texture, transparent color and slightly yellow; the bird's nest has the advantages of slight fishy smell, fineness, smoothness, softness and elasticity, belongs to bird's nest with excellent quality, and is graded above 90 points to be accepted by most people. From the results of the examples 1 and 2 and the comparative examples 1 to 3, it can be seen that the taste of the final product of the freeze-dried edible bird's nest is greatly influenced by temperature control in the freeze-drying process, and if the temperature is rapidly increased or is improperly increased, the taste and the quality of the edible bird's nest are reduced.

The embodiments of the present invention are preferred embodiments of the present application, and the scope of the present application is not limited by the embodiments of the present application, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.