Aquatic product processing technology and packaging method

Abstract

The invention discloses an aquatic product processing technology and a packaging method, and relates to the technical field of food. The specific preparation method comprises the following steps: by taking crabs as research objects, firstly, cooking the crabs to obtain cooked crabs; then preparing a packaging film, mixing the base material and the solvent, adding the plasticizer, then adding the active matter, stirring to obtain film liquid, and drying and balancing the film liquid to obtain the packaging film; and finally, packaging the cooked crabs in packaging films, extruding air, and freezing and storing. The packaging film prepared by the invention has good antibacterial performance, and can effectively inhibit the growth of bacteria, reduce food pollution and delay the decay process of crab products; the crab preservative also has good oxidation resistance, can slow down oxidation of fat, protein and other components in crabs, maintains nutritional ingredients and flavor of the crabs, improves the preservative and fresh-keeping effects of crab products, and prolongs the shelf life.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of food technology, in particular to a processing technology and packaging method of aquatic products. BACKGROUND

[0002] Aquatic products are favored by consumers due to their nutritional value, but their high water content and abundant protein can easily lead to spoilage and deterioration, especially during storage, which can still cause problems such as flavor deterioration, lipid oxidation, and color change, affecting food safety and taste. Currently, aquatic products on the market mainly rely on freezing or vacuum packaging for preservation. Freezing preservation can effectively inhibit the activity of bacteria and enzymes, but it cannot completely prevent lipid oxidation and flavor deterioration; vacuum packaging can delay bacterial reproduction and oxidation reactions by removing air from the package, but it can still face problems such as microbial growth and water loss during long-term storage. Although these methods can extend the shelf life to some extent, their effects on antibacterial, antiseptic, and moisturizing properties are still limited. Traditional food packaging mainly uses plastic products. Plastic is the most commonly used packaging material in the food industry, but it still has some shortcomings in terms of antibacterial, antiseptic, and moisturizing properties.

[0003] Therefore, it is of great market value to develop an optimized processing technology and preservation packaging technology to improve the storage stability of instant aquatic products. SUMMARY

[0004] The present application aims to provide a processing technology and packaging method of aquatic products to solve the problems of insufficient antibacterial, antiseptic, and moisturizing properties in the packaging of existing instant aquatic products.

[0005] To solve the above technical problems, the present application specifically provides the following technical solutions: The present application discloses a packaging film, which comprises a base material, a plasticizer, and an active substance; the base material is modified chitosan, and the active substance is mulberry leaf extract; the mass ratio of the use amount of the active substance to the base material is 1:0.6-2. Modified chitosan has good film-forming property and abundant active groups. Using modified chitosan as the base material to prepare the packaging film can make the packaging film have good barrier properties, and also can endow the packaging film with certain antibacterial and antioxidant properties. The use of mulberry leaf extract makes the packaging film more stable, and the mulberry leaf extract and chitosan can interact with each other to further improve the antibacterial and antioxidant properties and improve the comprehensive performance of the packaging film. Preferably, the plasticizer is glycerol and hexaglycerol, and the mass ratio of the use amount of the plasticizer to the base material is 1:1.5-2.5.

[0006] The present application discloses a processing technology or packaging method of aquatic products, which comprises: S1: washing live crabs, peeling off and removing crab paste and body meat, and steaming to obtain cooked crabs; S2: mixing the base material and the solvent, then adding the plasticizer and stirring, and then adding the active substance and stirring to obtain a film solution, drying the film solution, and then balancing to obtain a packaging film; the base material is modified chitosan, and the active substance is mulberry leaf extract; the base material is modified chitosan; the modified chitosan is prepared by reaction of chitosan, sodium hypochlorite, 3-chloro-2-hydroxy-propionic acid, 4-chloro-3-oxobutyric acid, and sodium bicarbonate; S3: packaging the cooked crabs in the packaging film, extruding air, and freezing and storing.

[0007] Preferably, in S2, the solvent is acetic acid and water, the volume ratio of the use amount of acetic acid to water is 1:95-105, and the use amount ratio of the base material to water is 1g:40-55ml.

[0008] Preferably, in S2, the active substance is mulberry leaf extract, and the mass ratio of the use amount of the active substance to the base material is 1:0.6-2.

[0009] Preferably, in S2, the plasticizer is glycerol and hexaglycerol, and the mass ratio of the use amount of the plasticizer to the base material is 1:1.5-2.5.

[0010] Preferably, in S1, the cooking time is 20-50min.

[0011] Preferably, in S2, the stirring time after adding the plasticizer is 0.5-1.5h, and the stirring time after adding the active substance is 20-60min.

[0012] Preferably, in S2, the film solution drying temperature is 40-60℃, the drying time is 15-25h, the balancing condition is a relative humidity of 40-60%, and the balancing time is 20-35h.

[0013] Preferably, in S3, the freezing and storing temperature is minus 25 to minus 10℃.

[0014] The application discloses a kind of aquatic product processing technology or packaging method, comprising: S1: washing live crab, peeling off crab paste and body meat and cooking 20-50min to obtain cooked crab; S2: mixing the base material and the solvent, then adding the plasticizer and stirring 0.5-1.5h, and then adding the active substance and stirring 20-60min to obtain a film solution, drying the film solution at 40-60℃ for 15-25h, and then balancing to obtain a packaging film for 20-35h; S3: packaging the cooked crabs in the packaging film, extruding air, and freezing and storing at minus 25 to minus 10℃.

[0015] Preferably, the solvent in S2 is acetic acid and water, the volume ratio of the usage amount of acetic acid and water is 1:95-105, and the usage amount ratio of the matrix material to water is 1g:40-55ml.

[0016] Preferably, the plasticizer in S2 is glycerol and hexylene glycol, and the mass ratio of the usage amount of the plasticizer to the matrix material is 1:1.5-2.5.

[0017] Preferably, the matrix material in S2 is modified chitosan, and the active substance is mulberry leaf extract; the mass ratio of the usage amount of the active substance to the matrix material is 1:0.6-2.

[0018] The application discloses a preparation method of modified chitosan. 2,2,6,6 tetramethylpiperidine N-oxide, sodium bromide and chitosan are added into water to obtain a dissolving solution, then a sodium hypochlorite solution is added, reaction is carried out at 20-30 DEG C for 2-5h, after the reaction is completed, the pH is adjusted to 6.5-7.5, then dialysis is carried out, ethanol is added, the precipitate is separated and dried to obtain an intermediate. Water, 3-chloro-2-hydroxy-propionic acid and 4-chloro-3-oxobutyric acid are added into the intermediate, reaction is carried out at 20-30 DEG C for 1-4h, then sodium bicarbonate is added, reaction is carried out at 50-65 DEG C for 6-10h, after the reaction is completed, the pH is adjusted to 3, then dialysis is carried out again, ethanol is added, the precipitate is separated and dried to obtain the modified chitosan.

[0019] Preferably, the mass ratio of the usage amount of 2,2,6,6 tetramethylpiperidine N-oxide to sodium bromide is 1:15-25.

[0020] Preferably, the mass ratio of the usage amount of sodium bromide to chitosan is 1:2-3.

[0021] Preferably, the usage amount ratio of chitosan to water in the dissolving solution is 1g:40-60ml.

[0022] Preferably, the sodium hypochlorite solution is composed of sodium hypochlorite and water, and the mass ratio of the usage amount of sodium hypochlorite to water is 1:6-12.

[0023] Preferably, the usage amount ratio of chitosan to the sodium hypochlorite solution is 1g:15-25ml.

[0024] Preferably, the hydrochloric acid solution is composed of hydrochloric acid and water, and the mass ratio of the usage amount of hydrochloric acid to water is 1:15-25.

[0025] Preferably, the molecular weight used for dialysis is 3200-3800Da.

[0026] Preferably, the usage amount ratio of the intermediate to water added into the intermediate is 1g:40-60ml.

[0027] Preferably, the mass ratio of the use amount of the intermediate to 3-chloro-2-hydroxy-propionic acid is 1:0.6-0.9.

[0028] Preferably, the mass ratio of the use amount of the intermediate to 4-chloro-3-oxo-butanoic acid is 1:0.6-0.9.

[0029] Preferably, the mass ratio of the use amount of the intermediate to sodium bicarbonate is 1:3-5.

[0030] More preferably, in the instant aquatic product processing process and packaging technology, on the basis of using the modified chitosan, the Rosa davurica Pall extract can also be used, and the modified chitosan and the Rosa davurica Pall extract are used in combination, so that the synergistic effect is achieved, the growth of bacteria can be further inhibited, free radicals can be effectively captured, the oxidation reaction can be slowed down, and therefore the antibacterial and antioxidant properties of the packaging film are enhanced, and the preservative and fresh-keeping effect is improved.

[0031] Preferably, the mass ratio of the use amount of the modified chitosan to the Rosa davurica Pall extract is 1:0.15-0.9.

[0032] Compared with the prior art, the present application has the following beneficial effects: The present application provides an aquatic product processing process and packaging method, taking crabs as the research object, first steaming the crabs to obtain cooked crabs, then preparing a packaging film by mixing a base material and a solvent, adding a plasticizer, and then adding an active substance to obtain a film liquid, drying and balancing the film liquid to obtain the packaging film, and finally packaging the cooked crabs in the packaging film, extruding air, and freezing and storing. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0034] Figure 1 The infrared spectrum characterization diagram of the modified chitosan. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] The following first describes the concepts involved in this application with reference to the accompanying drawings. It should be noted that the following description of each concept is intended only to make the content of this application easier to understand and does not limit the scope of protection of this application. At the same time, the embodiments and features in the embodiments of this application can be combined with each other unless there is a conflict. The following detailed description of this application will be made with reference to the accompanying drawings and in conjunction with the embodiments.

[0037] The abbreviations used in the specification and claims have the following meanings: Example 1: Preparation of cooked crabs: Wash the dirt on the surface of the live crabs with water, then remove the crab paste and body meat, and steam for 30 minutes to obtain cooked crabs, where the live crabs are mud crabs.

[0038] Preparation of modified chitosan: 2,2,6,6-tetramethylpiperidinium N-oxide, sodium bromide, and chitosan were added to water to obtain a solution. Sodium hypochlorite solution was then added to the solution and reacted at 25°C for 3 hours. After the reaction, hydrochloric acid solution was added to the solution until the pH reached 7, followed by dialysis to obtain a concentrate. Ethanol was added to the concentrate, and the precipitate was separated and dried to obtain an intermediate. Water, 3-chloro-2-hydroxy-propionic acid, and 4-chloro-3-oxobutanoic acid were added to the intermediate and reacted at 25°C for 2 hours. Sodium bicarbonate was then added to the solution and reacted at 55°C for 8 hours. After the reaction, hydrochloric acid solution was added to the solution until the pH reached 3, followed by dialysis and concentration. Ethanol was added, and the precipitate was separated and dried to obtain the modified chitosan. The mass ratio of 2,2,6,6-tetramethylpiperidinium N-oxide to sodium bromide is 1:20, the mass ratio of sodium bromide to chitosan is 1:2.5, the mass ratio of chitosan to water in the dissolving solution is 1 g:50 ml, the sodium hypochlorite solution is composed of sodium hypochlorite and water, and the mass ratio of sodium hypochlorite to water is 1:9, the mass ratio of chitosan to sodium hypochlorite solution is 1 g:20 ml, the hydrochloric acid solution is composed of hydrochloric acid and water, and the mass ratio of hydrochloric acid to water is 1:20, the molecular weight used for dialysis is 3500 Da, the mass ratio of the intermediate to water added to the intermediate is 1 g:50 ml, the mass ratio of the intermediate to 3-chloro-2-hydroxy-propionic acid is 1:0.75, the mass ratio of the intermediate to 4-chloro-3-oxobutyric acid is 1:0.75, and the mass ratio of the intermediate to sodium bicarbonate is 1:4.

[0039] Preparation of the packaging film: Modified chitosan, acetic acid, and water were mixed to form a mixture. Glycerol and hexaethylene glycol were then added to the mixture and stirred for 1 hour. Mulberry leaf extract was then added and stirred for another 30 minutes to form a film solution. The film solution was then dried at 50°C for 20 hours and then equilibrated at 50% relative humidity for 24 hours to form the packaging film. The modified chitosan to water ratio was 1 g:49 ml, the acetic acid to water ratio was 1:99 by volume, the glycerol to modified chitosan ratio was 1:2.02 by mass, the hexaethylene glycol to modified chitosan ratio was 1:40 by mass, and the mulberry leaf extract to modified chitosan ratio was 1:1 by mass.

[0040] Packaging of cooked crabs: Wrap the cooked crabs in packaging film, squeeze out the air, freeze and store at -20℃.

[0041] Example 2: The preparation of cooked crab is the same as in Example 1.

[0042] The preparation of modified chitosan is the same as that in Example 1.

[0043] Preparation of packaging film: The preparation of the packaging film in this embodiment is compared with that in Example 1, except that the mass ratio of the mulberry leaf extract to the modified chitosan in the mixed solution is 1:1.5, and the other conditions and parameters are the same as in Example 1.

[0044] Packaging of cooked crabs: The packaging of cooked crabs in this embodiment is different from that in Example 1 in that the packaging film used is the packaging film prepared in this embodiment, and other conditions and parameters are the same as in Example 1.

[0045] Example 3: The preparation of cooked crab is the same as in Example 1.

[0046] The preparation of modified chitosan is the same as that in Example 1.

[0047] Preparation of packaging film: The preparation of the packaging film in this embodiment is compared with that in Example 1, except that the mass ratio of the mulberry leaf extract to the modified chitosan in the mixed solution is 1:0.7, and other conditions and parameters are the same as in Example 1.

[0048] Packaging of cooked crabs: The packaging of cooked crabs in this embodiment is different from that in Example 1 in that the packaging film used is the packaging film prepared in this embodiment, and other conditions and parameters are the same as in Example 1.

[0049] Example 4: The preparation of cooked crab is the same as in Example 1.

[0050] The preparation of modified chitosan is the same as that in Example 1.

[0051] Preparation of the packaging film: Modified chitosan, acetic acid, and water were mixed to form a mixture. Glycerol and hexaethylene glycol were then added to the mixture and stirred for 1 hour. Mulberry leaf extract and Rosa laevigata extract were then added and stirred for 30 minutes to form a film solution. The film solution was then dried at 50°C for 20 hours and then equilibrated at 50% relative humidity for 24 hours to form the packaging film. The modified chitosan to water ratio was 1 g:49 ml, the acetic acid to water ratio was 1:99 by volume, the glycerol to modified chitosan ratio was 1:2.02, the hexaethylene glycol ratio was 1:40, the mulberry leaf extract ratio was 1:1, and the modified chitosan to Rosa laevigata extract ratio was 1:0.5.

[0052] Packaging of cooked crabs: The packaging of cooked crabs in this embodiment is different from that in Example 1 in that the packaging film used is the packaging film prepared in this embodiment, and other conditions and parameters are the same as in Example 1.

[0053] Example 5: The preparation of cooked crab is the same as in Example 1.

[0054] The preparation of modified chitosan is the same as that in Example 1.

[0055] Preparation of packaging film: The preparation of the packaging film in this embodiment is different from that in Example 4, except that the mass ratio of the modified chitosan to the Rosa laevigata extract in the mixed solution is 1:0.8, and other conditions and parameters are the same as in Example 4.

[0056] Packaging of cooked crabs: The packaging of cooked crabs in this embodiment is different from that in Example 4 in that the packaging film used is the packaging film prepared in this embodiment, and other conditions and parameters are the same as in Example 4.

[0057] Example 6: The preparation of cooked crab is the same as in Example 1.

[0058] The preparation of modified chitosan is the same as that in Example 1.

[0059] Preparation of packaging film: The preparation of the packaging film in this embodiment is different from that in Example 4, except that the mass ratio of the modified chitosan to the Rosa laevigata extract in the mixed solution is 1:0.2, and other conditions and parameters are the same as in Example 4.

[0060] Packaging of cooked crabs: The packaging of cooked crabs in this embodiment is different from that in Example 4 in that the packaging film used is the packaging film prepared in this embodiment, and other conditions and parameters are the same as in Example 4.

[0061] Comparative Example 1 Preparation of cooked crab is the same as Example 1.

[0062] Preparation of modified chitosan is the same as Example 1.

[0063] Preparation of packaging film: the preparation of packaging film in this example is the same as Example 1, except that the mass ratio of mulberry leaf extract to modified chitosan in the mixed solution is 1:0.1.

[0064] Packaging of cooked crab: the packaging of cooked crab in this example is the same as Example 1, except that the packaging film used is the packaging film prepared in this example.

[0065] Experimental Example 1 Safety analysis of packaging film: HepG2 cells were cultured in vitro in the culture solution of the packaging film of Examples 1-6 and Comparative Example 1 and the culture solution of the control sample, and the cell proliferation rate was measured. The culture solution was a conventional culture solution containing 90% DMEM and 10% FBS.

[0066] Table 1: Results of cell proliferation rate determination

[0067] The results of cell proliferation rate determination are shown in Table 1. The cell proliferation rates of Examples 1-6 and Comparative Example 1 all exceed 75%, meeting the clinical use standard. The cell proliferation rates are all lower than the blank sample control group, which may be due to the adsorption ability and antibacterial ability of the film solution itself, resulting in the inability of some cells to proliferate.

[0068] Experimental Example 2 Characterization of modified chitosan: the modified chitosan in Example 1 was characterized by infrared spectroscopy, with a scanning range of 500-4000 cm -1 . The results are shown in Figure 1 . The absorption peak of C-N is around 1200 cm -1 , the absorption peaks of C=O are at 1400-1450 cm -1 and 1550-1610 cm -1 , the absorption peak of C-H is at 2925 cm -1 , and the absorption peak of O-H is at 3200-3550 cm -1 .

[0069] Experimental Example 3 Determination of antibacterial performance: 6mm filter paper was soaked in the film solution of Examples 1-6 and Comparative Example 1 for 60min, and then placed on the culture medium containing Bacillus subtilis bacterial solution. After 24h of culture, the diameter of the inhibition zone was measured.

[0070] Table 2 Inhibition zone diameter measurement results

[0071] The results of the inhibition zone diameter determination are shown in Table 2. Compared with Example 2, Example 1 shows that increasing the amount of modified chitosan within a certain range can increase the inhibition zone diameter, that is, enhance the antibacterial properties of the membrane liquid and the packaging film; compared with Example 3, Example 1 shows that decreasing the amount of modified chitosan within a certain range can reduce the inhibition zone diameter, that is, reduce the antibacterial properties of the membrane liquid and the packaging film; compared with Example 4, Example 1 shows that using the Rosa laevigata extract on the basis of using modified chitosan can further increase the inhibition zone diameter and enhance the antibacterial properties of the membrane liquid and the packaging film. property; Example 4, compared with Example 5, shows that increasing the usage of the Rosa laevigata extract within a certain range can increase the diameter of the inhibition zone, that is, enhance the antibacterial properties of the membrane liquid and the packaging film; Example 4, compared with Example 6, shows that decreasing the usage of the Rosa laevigata extract within a certain range can reduce the diameter of the inhibition zone, that is, reduce the antibacterial properties of the membrane liquid and the packaging film; Example 1, compared with Comparative Example 1, shows that the usage of the modified chitosan needs to be within an appropriate range. If the usage is too low, the antibacterial property of the membrane liquid will be lower, thereby making the antibacterial property of the subsequently prepared packaging film also lower.

[0072] Experimental Example 4: Determination of antioxidant properties: The antioxidant properties were tested using the DPPH method. DPPH was added to methanol to obtain a DPPH solution. The DPPH solution was mixed with the membrane solutions of Examples 1-6 and Comparative Example 1. The mixture was allowed to react in the dark for 30 minutes. The absorbance was measured at 517 nm, and the free radical scavenging rate was calculated. Free radical scavenging rate = 1-(A i -A j ) / A0×100%. The concentration of DPPH in the DPPH solution is 40 mg / L, and the volume ratio of DPPH solution to membrane solution is 1:1.

[0073] Table 3 Free radical scavenging rate determination results

[0074] The results of free radical scavenging rate determination are shown in Table 3. Compared with Example 2, Example 1 shows that increasing the amount of modified chitosan within a certain range can increase the free radical scavenging rate, that is, enhance the antioxidant properties of the membrane liquid and packaging film; compared with Example 3, Example 1 shows that reducing the amount of modified chitosan within a certain range will reduce the free radical scavenging rate, that is, reduce the antioxidant properties of the membrane liquid and packaging film; compared with Example 4, Example 1 shows that on the basis of using modified chitosan, using the extract of Rosa laevigata can further increase the free radical scavenging rate and enhance the antioxidant properties of the membrane liquid and packaging film. The results show that the antioxidant performance of the membrane liquid and the packaging film can be improved by increasing the usage of the Rosa laevigata extract within a certain range, that is, enhancing the antioxidant performance of the membrane liquid and the packaging film; the results show that the antioxidant performance of the membrane liquid and the packaging film can be improved by decreasing the usage of the Rosa laevigata extract within a certain range, that is, reducing the antioxidant performance of the membrane liquid and the packaging film; the results show that the usage of the modified chitosan needs to be within an appropriate range. If the usage is too low, the antioxidant performance of the membrane liquid will be lower, thereby making the antioxidant performance of the packaging film prepared subsequently also lower.

[0075] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present invention, and do not impose any form of limitation on the implementation methods of the technology of the present invention. Any person skilled in the art may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as technologies or embodiments that are essentially the same as the present invention.

[0076] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of this application, they can also make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A packaging film comprising a base material, a plasticizer and an active substance; the base material is modified chitosan, the active substance is mulberry leaf extract, and the mass ratio of the active substance to the base material is 1:0.6-2.

2. A packaging film according to claim 1, characterized in that: The plasticizers are glycerol and hexaethylene glycol, and the mass ratio of the plasticizer to the base material is 1:1.5-2.

5.

3. A process for processing or packaging aquatic products, comprising: S1: Clean the live crabs, remove the crab paste and crab meat, and steam to obtain cooked crabs; S2: mixing a base material and a solvent, then adding a plasticizer and stirring, then adding an active ingredient and stirring to obtain a film liquid, drying the film liquid, and then balancing to obtain a packaging film; the base material is modified chitosan, and the active ingredient is mulberry leaf extract; the base material is modified chitosan; the modified chitosan is prepared by reacting chitosan, sodium hypochlorite, 3-chloro-2-hydroxy-propionic acid, 4-chloro-3-oxobutyric acid, and sodium bicarbonate; S3: The cooked crabs are divided into packages and wrapped in packaging films, the air is squeezed out, and the crabs are frozen for storage.

4. A processing technology or packaging method for aquatic products according to claim 3, characterized in that: The solvents in S2 are acetic acid and water, the volume ratio of acetic acid to water is 1:95-105, and the ratio of base material to water is 1g:40-55ml.

5. The aquatic product processing technology or packaging method according to claim 3, characterized in that: The active substance in S2 is mulberry leaf extract, and the mass ratio of the active substance to the base material is 1:0.6-2.

6. The aquatic product processing technology or packaging method according to claim 3, characterized in that: The plasticizers in S2 are glycerol and hexaethylene glycol, and the mass ratio of the plasticizer to the base material is 1:1.5-2.

5.

7. The aquatic product processing technology or packaging method according to claim 3, characterized in that: The cooking time in S1 is 20-50 minutes.

8. The aquatic product processing technology or packaging method according to claim 3, characterized in that: The stirring time after adding the plasticizer to S2 is 0.5-1.5 hours, and the stirring time after adding the active ingredient is 20-60 minutes.

9. The aquatic product processing technology or packaging method according to claim 3, characterized in that: The membrane liquid in S2 is dried at a temperature of 40-60° C., for a drying time of 15-25 h, and has an equilibrium condition of a relative humidity of 40-60% and an equilibrium time of 20-35 h.

10. The aquatic product processing technology or packaging method according to claim 3, characterized in that: The frozen storage temperature in S3 is -25--10°C.

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