Natural printing ink for collagen casing and preparation method of natural printing ink

Abstract

The invention discloses natural printing ink for collagen casings and a preparation method of the natural printing ink, and belongs to the technical field of food printing materials. The preparation method of the ink comprises the following steps: mixing chitosan with water, adding natural organic acid, and stirring to obtain a mixed solution A; dissolving cocoa powder and lecithin in water at 80-100 DEG C, and uniformly stirring to obtain a mixed solution B; the method comprises the following steps: adding water into a collagen dough for producing collagen casings according to a weight ratio of the collagen dough to the water of 1: (5-7), and grinding to obtain a mixed solution C; and adding the mixed solution B, the mixed solution C and TG enzyme into the mixed solution A, and stirring to obtain the natural ink for collagen casings. According to the invention, the shaping process is simple, the shaped casing does not fade when encountering water, the color is more stable after cooking, frying and baking, and the used raw materials are natural sources, are safe and healthy, and are more easily accepted by the public.

Description

Technical Field

[0001] The present application relates to a natural ink for collagen casings and a preparation method thereof, belonging to the technical field of food printing materials. Background Art

[0002] Sausage is a very convenient food in modern people's lives. It enriches people's dietary needs with its unique flavor and convenient carrying, and is a fast food popular all over the world. The casing is specially used for packaging sausages. Its main purpose is to prevent the sausage from being damaged during the manufacturing process, form a unified shape of the sausage, and extend the storage time of the sausage. Printing words or patterns on the surface of the sausage can increase the appearance beauty, enhance brand recognition, convey strong information and personalized creativity, and achieve a good publicity effect.

[0003] Collagen casings are made from materials such as animal skins or tendons and are edible. By eating them, collagen in the human body can be supplemented, making the skin firm. However, there may be grease on the surface of the collagen casing, which is not conducive to printing on the casing. After high-temperature steaming, frying or baking, the printing ink will have the problem of decolorization. Chinese invention patent CN202311411408.3 discloses a collagen casing edible printing ink and a preparation method thereof. By the combined action of chitosan, mono- and diglycerol fatty acid esters and span, the effect of printing on the casing can be achieved, and the casing will not have the problems of ink dropping and fading during high-temperature steaming, and is resistant to high-temperature boiling water, frying and baking. However, for edible pigment products, most consumers have a resistant mentality, and a large number of synthetic additives are also involved in this ink, so it is difficult to be accepted by the public, thus limiting its wide application. Summary of the Invention

[0004] In order to solve the above problems, a natural ink for collagen casings and a preparation method thereof are provided. Not only does the shaped casing not fade when exposed to water, but also the color is more stable after steaming, frying and baking. Moreover, all the raw materials used are of natural origin, safe and healthy, and are more easily accepted by the public.

[0005] The technical solution adopted by the present invention to solve the technical problems is as follows: According to one aspect of the present application, a preparation method of a natural ink for collagen casings is provided, including the following steps: (1) Mix chitosan with water, then add natural organic acid, and stir at 5000 - 7000 rpm for 5 - 15 min to obtain a mixed solution A; (2) Dissolve cocoa powder and lecithin in water at 80 - 100 °C, and stir evenly to obtain a mixed solution B; (3) Add water to the collagen mass for producing collagen casings. The weight ratio of the collagen mass to water is 1:(5 - 7), and grind for 10 - 20 min to obtain mixture C; (4) Add mixture B, mixture C, and TG enzyme to mixture A, and stir at 5000 - 7000 rpm for 20 - 40 min to obtain the natural ink for collagen casings.

[0006] Optionally, in step (1), the weight ratio of the chitosan to the natural organic acid is (1.2 - 1.8):1.

[0007] Optionally, the natural organic acid is selected from at least one of lactic acid, acetic acid, and citric acid.

[0008] Optionally, in step (2), the weight ratio of the cocoa powder to the lecithin is (10 - 15):1.

[0009] Optionally, the concentration of mixture A is 5 - 8% w / v.

[0010] Optionally, the concentration of mixture B is 17 - 22% w / v.

[0011] Optionally, the concentration of mixture C is 6.6 - 7.6% w / v.

[0012] Optionally, the addition amount of the TG enzyme is 0.005 - 0.015 g added per 100 mL of mixture C.

[0013] Optionally, in step (4), the weight ratio of mixture A, mixture B, and mixture C is (1.8 - 2.5):1:1.

[0014] According to another aspect of the present application, there is provided a natural ink for collagen casings, which is prepared by the preparation method of the natural ink for collagen casings described in any one of the above.

[0015] In the present application, "TG enzyme" refers to transglutaminase.

[0016] The beneficial effects of the present application include but are not limited to: 1. In the preparation method of the natural ink for collagen casings of the present application, all raw materials used are of natural origin, having better biocompatibility and safety. Among them, chitosan has good antibacterial, film-forming, viscosity-enhancing, and biodegradability. As a natural pigment source, cocoa powder not only has a strong chocolate flavor and aroma but also can endow the ink with a natural color, better meeting consumers' demands for natural and healthy products. The addition of natural organic acids can make the solution acidic. Under acidic conditions, the amino groups in chitosan molecules will be protonated, thereby increasing its solubility in water. As an excellent natural emulsifier, lecithin can reduce the surface tension at the oil-water interface, evenly disperse cocoa powder in hot water, and prevent cocoa powder particles from aggregating and precipitating, thus ensuring that the ink has a uniform texture and performance.

[0017] 2. In the preparation method of the natural ink for collagen casings of the present application, the collagen solution has better adhesion to the collagen casing. Through the hot air drying and shaping stage, the cross-linking of TG enzyme and the collagen solution can better attach cocoa powder to the casing. Specifically, TG enzyme can catalyze the cross-linking reaction between protein molecules, forming a firm film on the surface of the collagen casing, which is not easy to fall off, thus ensuring the printing effect and durability of the ink on the casing. The preparation method is simple, does not involve complex equipment and synthetic raw materials, has higher safety, and is suitable for large-scale production.

[0018] 3. For the natural ink for collagen casings of the present application, the shaped casing does not fade when exposed to water, and the color is more stable after steaming, frying, and baking. After being printed on the sausage, the ink forms bright colors, patterns, or marks, which not only do not make consumers have a repulsive psychology but also greatly increase the appetite for the sausage and the recognition of the sausage product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings: Figure 1 It is a schematic diagram of printing the ink of Example 2 on the casing after filling; Figure 2 It is a schematic diagram after printing the ink of Example 2 on the casing and steaming at 100 °C for 30 min; Figure 3 It is a schematic diagram after printing the ink of Example 2 on the casing and frying at 170 °C for 3 min; Figure 4 It is a schematic diagram after printing the ink of Example 2 on the casing and baking in a baking machine at 150 °C for 25 min. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The endpoints and any values within the ranges disclosed herein are not limited to the exact ranges or values. These ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the values between the endpoints of each range, between the endpoint values of each range and individual point values, and between individual point values can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed herein.

[0021] For those not specified in the examples, they are carried out under conventional conditions or conditions recommended by the manufacturer. For raw materials or instruments not specified for the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0022] The collagen mass involved hereinafter is the collagen mass involved in the invention-authorized patent CN114223701A of the company.

[0023] Example 1 A preparation method of a natural ink for collagen casings, comprising the following steps: (1) Mix chitosan with water, and then add acetic acid. The weight ratio of chitosan to acetic acid is 1.2:1, and stir at 5000 rpm for 5 min to obtain a mixture A with a concentration of 5% w / v; (2) Dissolve cocoa powder and lecithin with a weight ratio of 10:1 in water at 80 °C, stir evenly to obtain a mixture B with a concentration of 17% w / v; (3) Add water to the collagen mass (with a moisture content of 89%) for producing collagen casings. The weight ratio of the collagen mass to water is 1:7, and grind for 10 min to obtain a mixture C with a concentration of 6.6% w / v; (4) Add mixture B, mixture C and TG enzyme to mixture A. The addition amount of TG enzyme is 0.005 g per 100 mL of mixture C. The weight ratio of mixture A, mixture B and mixture C is 1.8:1:1, and stir at 5000 rpm for 20 min to obtain a natural ink for collagen casings.

[0024] Example 2 A preparation method of a natural ink for collagen casings, comprising the following steps: (1) Mix chitosan with water, and then add lactic acid. The weight ratio of chitosan to lactic acid is 1.5:1, and stir at 6000 rpm for 10 min to obtain a mixture A with a concentration of 6.8% w / v; (2) Dissolve cocoa powder and lecithin with a weight ratio of 12.5:1 in water at 90 °C, stir evenly to obtain a mixture B with a concentration of 19.7% w / v; (3) Add water to the collagen mass (with a moisture content of 89%) for producing collagen casings. The weight ratio of the collagen mass to water is 1:6, and grind for 15 min to obtain a mixture C with a concentration of 7.1% w / v; (4) Add mixture B, mixture C, and TG enzyme to mixture A. The addition amount of TG enzyme is 0.01 g per 100 mL of mixture C. The weight ratio of mixture A, mixture B, and mixture C is 2.2:1:1, and stir at 6000 rpm for 30 min to obtain a natural ink for collagen casings.

[0025] Example 3 A preparation method of a natural ink for collagen casings, comprising the following steps: (1) Mix chitosan with water, and then add citric acid. The weight ratio of chitosan to citric acid is 1.8:1, and stir at 7000 rpm for 15 min to obtain a mixture A with a concentration of 8% w / v; (2) Dissolve cocoa powder and lecithin with a weight ratio of 15:1 in water at 100 °C, and stir evenly to obtain a mixture B with a concentration of 22% w / v; (3) Add water to the collagen mass (with a moisture content of 89%) for producing collagen casings. The weight ratio of the collagen mass to water is 1:5, and grind for 20 min to obtain a mixture C with a concentration of 7.6% w / v; (4) Add mixture B, mixture C, and TG enzyme to mixture A. The addition amount of TG enzyme is 0.015 g per 100 mL of mixture C. The weight ratio of mixture A, mixture B, and mixture C is 2.5:1:1, and stir at 7000 rpm for 40 min to obtain a natural ink for collagen casings.

[0026] Comparative Example 1 The difference from Example 2 is that cocoa powder is replaced with chocolate powder.

[0027] Comparative Example 2 The difference from Example 2 is that TG enzyme is not added.

[0028] Comparative Example 3 The difference from Example 2 is that the weight ratio of the collagen mass to water is 1:10, and the concentration of mixture C is 5.5% w / v.

[0029] Comparative Example 4 Example 1 in the specific implementation manner of the specification of Chinese Invention Patent CN202311411408.3

[0030] Performance Test The inks prepared in Examples 1-3 and Comparative Examples 1-3 were poured onto a roller with a stereotype plate, and the casing was printed through the roller. The printing was dried and shaped by hot air. The sausages prepared in Examples 1-3 and Comparative Examples 1-4 were steamed at 100 °C for 30 min, fried at 170 °C for 3 min, and baked in a baking machine at 150 °C for 25 min. Whether the patterns peeled off was observed, and the test results are shown in Table 1.

[0031] Table 1

[0032] As can be seen from the results in Table 1, the natural ink for collagen casing prepared by the preparation method of the present application is safe and healthy, and will not cause consumers to have a resistant mentality. Moreover, the casing after shaping does not fade when exposed to water, and the color is more stable after steaming, frying, and baking. Among them, the ink of Example 2 was printed on the casing. After filling, as Figure 1 shown, after steaming at 100 °C for 30 min, as Figure 2 shown, after frying at 170 °C for 3 min, as Figure 3 shown, after baking in a baking machine at 150 °C for 25 min, as Figure 4 shown, the pattern is clear and the color is bright, which is beneficial to increasing the appetite for sausages.

[0033] The above are only the embodiments of the present application. The protection scope of the present application is not limited by these specific embodiments, but is determined by the claims of the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the technical idea and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A method for preparing natural ink for collagen casing, characterized in that: The following steps are involved: (1) Mix chitosan and water, add natural organic acid, and stir at 5000-7000 rpm for 5-15 min to obtain a mixed solution A; (2) Dissolve cocoa powder and lecithin in 80-100°C water and stir evenly to obtain a mixed solution B; (3) adding water to the collagen mass for producing collagen casing, with the weight ratio of collagen mass to water being 1:(5-7), and grinding for 10-20 minutes to obtain a mixed solution C; (4) Add mixed solution B, mixed solution C and TG enzyme to mixed solution A, and stir at 5000-7000 rpm for 20-40 min to obtain natural ink for collagen casing.

2. The method for preparing natural ink for collagen casing according to claim 1, characterized in that: In step (1), the weight ratio of chitosan to natural organic acid is (1.2-1.8):

1.

3. The method for preparing natural ink for collagen casing according to claim 1, characterized in that: The natural organic acid is selected from at least one of lactic acid, acetic acid and citric acid.

4. The method for preparing natural ink for collagen casing according to claim 1, characterized in that: In step (2), the weight ratio of cocoa powder to lecithin is (10-15):

1.

5. The method for preparing natural ink for collagen casing according to claim 1, characterized in that: The concentration of the mixed solution A is 5-8% w / v.

6. The method for preparing natural ink for collagen casing according to claim 1, characterized in that: The concentration of the mixed solution B is 17-22% w / v.

7. The method for preparing natural ink for collagen casing according to claim 1, characterized in that: The concentration of the mixed solution C is 6.6-7.6% w / v.

8. The method for preparing natural ink for collagen casing according to claim 1, characterized in that: The amount of TG enzyme added is 0.005-0.015 g per 100 mL of mixed solution C.

9. The method for preparing natural ink for collagen sausage casing according to claim 1, characterized in that: In step (4), the weight ratio of the mixed solution A, the mixed solution B and the mixed solution C is (1.8-2.5):1:

1.

10. A natural ink for collagen sausage casing, characterized in that: The natural ink for collagen casings is prepared by the method for preparing the natural ink for collagen casings according to any one of claims 1 to 9.

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