Preparation method of high-temperature cooking-resistant and frying-resistant natural collagen-imitated printed casing

Abstract

The invention relates to a preparation method of a high-temperature cooking-resistant and frying-resistant natural collagen-imitated printed casing. Selecting high-quality cow belly and cow back split leather and natural casing leftover materials; rotating hub treatment and cleaning; aging the pickled skin; preparing collagen mucilage; preparing a collagen colloid; homogenizing and filtering; casing extrusion; plasma treatment: transferring the casing to a plasma treatment machine in a roll form, selecting an aluminum electrode and a rubber roller, and treating by adopting an upper roller and a lower roller to ensure the uniformity of sample treatment; printing treatment: selecting high-temperature-resistant food-grade printing ink to print on the casing, drying, and winding into a roll. Compared with the prior art, the method has the advantages that the surface of the casing is subjected to plasma treatment, a new active group hydroxyl is introduced to the surface of collagen, the surface energy of the casing is improved, the casing is more hydrophilic, printing ink is easier to combine with the casing to generate new chemical crosslinking when the casing is printed through high-temperature-resistant food-grade printing ink, so that the printing fastness is improved, the casing is not easy to decolor, and the quality of the casing is improved. And thus, the product is resistant to high-temperature cooking and frying.

Description

Technical Field

[0001] The invention relates to the technical field of casing preparation, and in particular to a method for preparing a natural collagen-like printed casing that is resistant to high-temperature steaming and frying. Background Art

[0002] Currently, there are no collagen printed casings on the market, only printing involving cellulose and plastic casings, which are very different from collagen casings. Wuhan Keyihua has published a patent CN202311411408.3 A collagen casing edible printing ink and its preparation method, which mainly introduces printing ink. Because collagen casings involve high-temperature cooking, frying and other conditions in application, if collagen printing ink is used directly for printing, there will be problems such as insufficient printing fastness and easy fading.

[0003] The invention develops a natural collagen-like printed casing which is resistant to high temperature cooking and frying, enriches the market of collagen casings and improves the competitiveness of products. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for preparing a natural collagen printed casing that is resistant to high temperature steaming and frying, which can solve the problem that there is no collagen printed casing in the prior art and direct use of collagen printing ink for printing will result in insufficient printing fastness and easy fading.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: comprising the following steps: S1. Raw material selection: Select high-quality beef belly and back split hides and natural casing scraps; S2, hub treatment: Use alkaline protease to treat the split leather in the hub, decalcify with ammonium sulfate and citric acid, and then use citric acid and sodium citrate for buffering; S3. Hub cleaning: Use process chilled water to fully clean, control the conductivity <200u, and cool the cowhide; S4, acid skin aging: take out the acid skin and age it in a cold storage to make it fully swell; S5, preparation of collagen slurry: mixing split skin and natural casing scraps, wherein the mass ratio of split skin to natural casing scraps is 80:20, dicing into 8 mm pieces, and grinding for multiple cycles to obtain collagen slurry; S6. Preparation of collagen colloid: Mix the glue and HCl acid water with a pH of 2 in a volume ratio of 1:1 to obtain a crude collagen colloid, and allow the colloid to stand for aging before filling to allow the colloid to fully swell; S7, homogenization and filtration: homogenize by a homogenizer, then pass through a filter to finally obtain a uniform and stable collagen colloid; S8, casing extrusion: set the extrusion speed to above 6000m / h, the dry bulb temperature to 78℃, and gradually stretch and dry, the extrusion speed / winding speed = 1 / 1.5, and extrude and dry the casing to obtain the natural collagen casing; S9, plasma treatment: The casing is transferred to the plasma treatment machine in the form of a roll, and an aluminum electrode plus a rubber roller are selected, and the upper and lower double rollers are used for treatment to ensure the uniformity of sample treatment. The treatment conditions are: current 2-6A, speed 6-10m / min; S10, printing treatment: select high temperature resistant food grade ink to print on the casing, dry after printing, and then wind it into a roll.

[0006] Furthermore, in step S2, the alkaline protease liquid ratio is 100%, the alkaline protease is Novo protease, the addition ratio to the weight of cowhide is 0.8-1L / 1000kg, and the processing time is 24h.

[0007] Furthermore, in step S2, during the decalcification treatment, water is added to a liquid ratio of 60%, ammonium sulfate is added at 0.4-0.6% by weight of the cowhide, and citric acid is added at 0.4-0.6% by weight to reduce the pH value from 12 to 9. The treatment time is 12-24 hours.

[0008] Furthermore, in step S2, when citric acid and sodium citrate are used as buffers, the liquid ratio is 100%, 0.6-0.8% citric acid and 0.6-0.8% sodium citrate are added to the weight of the cowhide, the pH value is controlled to be 5, and the processing time is 12-24 hours.

[0009] Furthermore, in step S10, the drying temperature is 60° C. and the drying time is 1 min.

[0010] The advantages of the present invention are as follows: by plasma treatment of the casing surface, new active group hydroxyl groups are introduced on the collagen surface, thereby improving the surface energy of the casing, making it more hydrophilic and improving the hydrophilicity; when printing with high-temperature resistant food-grade ink, the ink is more easily combined with the casing to generate new chemical cross-links, thereby improving the printing fastness, making it less likely to decolorize, and making it resistant to high-temperature steaming and frying. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical scheme and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with specific implementation methods. The following examples can enable technicians in this field to understand the present invention more comprehensively, but the present invention is not limited to the scope of the embodiments.

[0012] This specific implementation adopts the following technical solution: a method for preparing a natural collagen-like printed casing that is resistant to high temperature cooking and frying, comprising the following steps: S1. Raw material selection: Select high-quality beef belly and beef back split hides and natural casing scraps. The mass ratio of split hides to natural casing scraps is 80:20.

[0013] S2. Hub treatment: Use alkaline protease to treat the second layer of leather in the hub, the alkaline protease liquid ratio is 100%, the alkaline protease is Novo protease, the addition ratio is 0.8-1L / 1000kg for the weight of cowhide, the treatment time is 24h, after the treatment, use ammonium sulfate and citric acid for decalcification, add water to 60% liquid ratio, add 0.4-0.6% ammonium sulfate and 0.4-0.6% citric acid to the weight of cowhide, so that the pH value drops from 12 to 9, the treatment time is 12-24h, and then use citric acid and sodium citrate for buffering, the liquid ratio is 100%, add 0.6-0.8% citric acid and 0.6-0.8% sodium citrate to the weight of cowhide, control the pH value to 5, and the treatment time is 12-24h.

[0014] S3. Hub cleaning: Use process chilled water to fully clean, control the conductivity <200u, and cool the cowhide.

[0015] S4. Acid skin aging: Take out the acid skin and age it in a cold storage to allow it to fully swell.

[0016] S5. Preparation of collagen slurry: Mix the split skin and natural casing scraps, cut into 8 mm pieces, and grind them several times to obtain collagen slurry.

[0017] S6. Preparation of collagen colloid: Mix the slurry and HCl acid water with a pH of 2 in a volume ratio of 1:1 to obtain crude collagen colloid, and allow it to stand and age before filling to allow the colloid to fully swell.

[0018] S7. Homogenization and filtration: Homogenize by a homogenizer and then pass through a filter to finally obtain a uniform and stable collagen colloid.

[0019] S8, casing extrusion: set the extrusion speed to above 6000m / h, the dry bulb temperature to 78℃, and gradually stretch and dry, the extrusion speed / winding speed = 1 / 1.5, and extrude and dry the casing to obtain the simulated natural collagen casing.

[0020] S9. Plasma treatment: The casing is transferred to the plasma treatment machine in the form of a roll. Aluminum electrodes and rubber rollers are selected, and the upper and lower double rollers are used for treatment to ensure the uniformity of sample treatment. The treatment conditions are: current 2-6A, speed 6-10m / min. The treatment conditions can be adjusted as needed, but it should be noted that if the treatment degree is too light, the surface modification effect cannot be achieved, and if the treatment degree is too heavy, the casing itself will be damaged.

[0021] S10, printing treatment: select high temperature resistant food grade ink to print on the casing, dry after printing, the drying temperature is 60℃, the drying time is 1min, and then roll it into a roll.

[0022] Embodiment 1: According to the above method, a natural collagen-like printed casing resistant to high temperature cooking and frying is prepared, wherein S2, hub treatment: alkaline protease is added at a ratio of 0.8L / 1000kg to the weight of cowhide, and ammonium sulfate and citric acid are used for decalcification after treatment, ammonium sulfate is added to 0.4% of the weight of the cowhide, and citric acid is added to 0.4%, and the treatment time is 24h, and then citric acid and sodium citrate are used for buffering, 0.6% citric acid and 0.8% sodium citrate are added to the weight of the cowhide, and the pH value is controlled to be 5, and the treatment time is 24h; S9, plasma treatment: treatment conditions: current 6A, speed 10m / min; S10, Printing treatment: Use commercially available high temperature resistant food grade ink from Wuhan Shanyin Technology Co., Ltd.

[0023] Comparative Example 1: The other steps of Comparative Example 1 are the same as those of Example 1, except that the plasma treatment in step S9 is not performed, and in step S10, ordinary ink that is not resistant to high temperatures is selected.

[0024] Comparative Example 2: The other steps of Comparative Example 2 are the same as those of Example 1, except that in step S10, ordinary ink that is not resistant to high temperatures is selected.

[0025] Comparative Example 3: The other steps of Comparative Example 3 are the same as those of Example 1, except that the plasma treatment in step S9 is not performed.

[0026] The casings prepared in Example 1 and Comparative Examples 1-3 were used to make sausages. The prepared sausages were subjected to boiling and frying tests. The comparative results of the test effects are shown in Table 1.

[0027] Table 1: Comparison of the boiling and frying test results of sausages made from casings prepared in Example 1 and Comparative Examples 1-3 From the above test results, it can be seen that the casing prepared in Example 1 has significantly improved printing fastness compared with comparative examples 1-3, and the casing is more resistant to high temperature cooking and frying, and the product meets market application requirements.

[0028] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for preparing a natural collagen-like printed casing that is resistant to high temperature cooking and frying, characterized in that: The following steps are involved: S1. Raw material selection: Select high-quality beef belly and back split hides and natural casing scraps; S2, hub treatment: Use alkaline protease to treat the split leather in the hub, decalcify with ammonium sulfate and citric acid, and then use citric acid and sodium citrate for buffering; S3. Hub cleaning: Use process chilled water to fully clean, control the conductivity <200u, and cool the cowhide; S4, acid skin aging: take out the acid skin and age it in a cold storage to make it fully swell; S5, preparation of collagen slurry: mixing split skin and natural casing scraps, wherein the mass ratio of split skin to natural casing scraps is 80:20, dicing into 8 mm pieces, and grinding for multiple cycles to obtain collagen slurry; S6. Preparation of collagen colloid: Mix the slurry and HCl acid water with a pH of 2 in a volume ratio of 1:1 to obtain a crude collagen colloid, and allow the colloid to stand for aging before filling to allow the colloid to fully swell; S7, homogenization and filtration: homogenize by a homogenizer, then pass through a filter to finally obtain a uniform and stable collagen colloid; S8, casing extrusion: set the extrusion speed to above 6000m / h, the dry bulb temperature to 78℃, and gradually stretch and dry, the extrusion speed / winding speed = 1 / 1.5, and extrude and dry the casing to obtain the natural collagen casing; S9, plasma treatment: The casing is transferred to the plasma treatment machine in the form of a roll, and an aluminum electrode plus a rubber roller are selected, and the upper and lower double rollers are used for treatment to ensure the uniformity of sample treatment. The treatment conditions are: current 2-6A, speed 6-10m / min; S10, printing treatment: select high temperature resistant food grade ink to print on the casing, dry after printing, and then wind it into a roll.

2. The method for preparing a high temperature resistant steaming and frying resistant natural collagen printed casing according to claim 1, characterized in that: In the step S2, the alkaline protease liquid ratio is 100%, the alkaline protease is Novo protease, the addition ratio to the weight of the cowhide is 0.8-1L / 1000kg, and the processing time is 24h.

3. The method for preparing a high temperature resistant steaming and frying resistant natural collagen printed casing according to claim 1, characterized in that: In step S2, during the decalcification treatment, water is added to a liquid ratio of 60%, ammonium sulfate is added at 0.4-0.6% of the weight of the cowhide, and citric acid is added at 0.4-0.6% to reduce the pH value from 12 to 9. The treatment time is 12-24 hours.

4. The method for preparing a high temperature resistant steaming and frying resistant natural collagen printed casing according to claim 1, characterized in that: In step S2, when citric acid and sodium citrate are used as buffer, the liquid ratio is 100%, 0.6-0.8% citric acid and 0.6-0.8% sodium citrate are added to the weight of the cowhide, the pH value is controlled to be 5, and the processing time is 12-24 hours.

5. The method for preparing a high temperature resistant steaming and frying resistant natural collagen printed casing according to claim 1, characterized in that: In the step S10, the drying temperature is 60° C. and the drying time is 1 min.

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