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CN-122008657-A - Sustained-release antibacterial and antioxidant composite film and application thereof in preservation of livestock and poultry precast vegetables

CN122008657ACN 122008657 ACN122008657 ACN 122008657ACN-122008657-A

Abstract

The invention discloses a slow-release antibacterial and antioxidant composite film and application thereof in preserving livestock and poultry precast vegetables. The multifunctional composite material comprises a first outer layer, a functional inner layer and a second outer layer from top to bottom, wherein the first outer layer and the second outer layer both contain polyvinyl butyral and ethylcellulose, and the functional inner layer contains ZIF-, 8@cinnamaldehyde, starch, glycerol and chitosan. Dissolving polyvinyl butyral and ethyl cellulose in absolute ethyl alcohol, heating and stirring uniformly to obtain outer layer membrane liquid, respectively dissolving starch and chitosan in deionized water and acetic acid solution to prepare starch solution and chitosan solution, uniformly mixing the two solutions, adding glycerol and ZIF-, stirring uniformly at room temperature to obtain inner layer membrane liquid, and pouring the outer layer membrane liquid and the inner layer membrane liquid to obtain the composite membrane. The composite film has slow-release antibacterial and antioxidant functions, and can be used for preserving livestock and poultry vegetables.

Inventors

  • XU ZHIXIANG
  • DING XINRU
  • SUN YUFENG
  • CHEN YONGFENG
  • WANG XIMO

Assignees

  • 山东农业大学

Dates

Publication Date
20260512
Application Date
20260204

Claims (10)

  1. 1. A slow-release antibacterial and antioxidant composite film is characterized by sequentially comprising a first outer layer, a functional inner layer and a second outer layer from top to bottom, wherein the first outer layer and the second outer layer both contain polyvinyl butyral and ethylcellulose, and the functional inner layer contains ZIF & # x2011, 8@cinnamaldehyde, starch, glycerol and chitosan.
  2. 2. The sustained-release antibacterial and antioxidant composite membrane according to claim 1, wherein the thickness of the first outer layer and the second outer layer is 0.05 mm a.
  3. 3. The sustained-release antibacterial and antioxidant composite membrane according to claim 1, wherein the functional inner layer has a thickness of 0.06 mm.
  4. 4. The slow-release antibacterial and antioxidant composite membrane according to claim 1, wherein the slow-release antibacterial and antioxidant composite membrane is prepared by the following method: (1) Dissolving polyvinyl butyral and ethyl cellulose in absolute ethyl alcohol, heating and uniformly stirring to obtain outer layer membrane liquid; (2) Respectively dissolving nitrate zinc hexahydrate and 2-methylimidazole in methanol to obtain an acid salt zinc hexahydrate solution and a 2-methylimidazole solution, pouring the nitrate zinc hexahydrate solution into the 2-methylimidazole solution, stirring and drying to obtain ZIF &#x2011, 8, putting ZIF ≡ #x2011, 8 into a methanol solution of cinnamaldehyde, heating, stirring and drying to obtain ZIF +#x2011, 8@CIN, dissolving starch in deionized water, adding glycerol and gelatinizing to obtain a gelatinized starch solution, dissolving chitosan in an acetic acid solution to obtain a chitosan solution, uniformly mixing the two solutions, and then adding ZIF +#x2011, 8@CIN, and uniformly stirring at room temperature to obtain an inner layer membrane solution; (3) Pouring the outer layer membrane liquid to obtain a first outer layer, drying at room temperature, pouring the inner layer membrane liquid to obtain a functional inner layer, standing at room temperature, pouring the outer layer membrane liquid to obtain a second outer layer, and drying to obtain the functional inner layer.
  5. 5. The sustained-release antibacterial and antioxidant composite membrane according to claim 4, wherein in the step (1), the addition amount ratio of the polyvinyl butyral, the ethylcellulose and the absolute ethyl alcohol is 6 g:4 g:125 mL, and the heating temperature is 50 ℃ and the time is 1h.
  6. 6. The slow-release antibacterial and antioxidant composite membrane according to claim 4, wherein in the step (2), the nitrate zinc hexahydrate and 2& # x2011 are mixed in a molar ratio of 1:8, the stirring time is 1h, and the drying time is 12h.
  7. 7. The slow-release antibacterial and antioxidant composite membrane according to claim 4, wherein in the step (2), the ratio of the ZIF & # x2011, the addition amount of the 8 nano-particles and the methanol solution of cinnamaldehyde is 1g to 10mL, and the heating and stirring temperature is 50 ℃ and the time is 5h.
  8. 8. The slow-release antibacterial and antioxidant composite membrane according to claim 4, wherein the volume ratio of the starch solution to the chitosan solution is 5:4, the mass ratio of the starch to the chitosan is 3:1, the addition amount of the glycerol is 35% of the total mass of the starch and the chitosan, and the addition amount of the ZIF & # x2011 and 8@CIN is 2-6% of the total mass of the starch and the chitosan.
  9. 9. The sustained-release antibacterial and antioxidant composite membrane according to claim 4, wherein in the step (3), the drying time at room temperature is 2 hours, and the standing time at room temperature is 48 hours.
  10. 10. The use of a slow-release antibacterial and antioxidant composite film according to any one of claims 1-9 in preserving livestock and poultry vegetables.

Description

Sustained-release antibacterial and antioxidant composite film and application thereof in preservation of livestock and poultry precast vegetables Technical Field The invention relates to the technical field of food packaging, in particular to a slow-release antibacterial and antioxidant composite film and application thereof in preservation of livestock and poultry precast vegetables. Background The packaging film material of the food is particularly important in the transportation and storage of the food, can block the external environment to the greatest extent and resist the invasion of microorganisms, thereby ensuring the quality of the food. At present, the packaging films commonly used in the market are mainly polyethylene or polyvinyl chloride plastic films, and the problem of white pollution caused by difficult degradation of the plastic films has seriously threatened the natural environment and is increasingly becoming a worldwide public hazard. The development of bioactive and environment-friendly food packaging has become an important point in food preservation research. Metal Organic Frameworks (MOFs) are materials with well organized porous structures formed by the binding of metal cations and organic ligands. MOFs exhibit beneficial properties such as high surface area, controllable pore size, functional flexibility, ease of modification, and good biocompatibility. ZIF & # x2011;8 (Zn ≡ # x2011; MOF) is a subclass of MOFs, consisting of Zn2+ ions and pyrazole or its derivatives, respectively, which are remarkable in their versatility. Zn & # x2011, MOFs can be used as multifunctional materials in the packaging field due to high porosity, ultraviolet absorption and good dispersibility in aqueous media. Cinnamaldehyde is a natural antibacterial and antioxidant, and is generally considered to be safe and has a strong food preservation potential. Antibacterial materials combining MOFs with cinnamaldehyde have therefore been developed. However, the use of cinnamaldehyde is limited by its instability, volatility and strong odor, which may lead to unacceptable organoleptic properties. Patent application number CN 121203319A discloses an ethylene adsorption and pH/pectase double-response intelligent antibacterial composite membrane, a preparation method and application thereof, and ZIF-8@cinnamaldehyde@pectin is used as a functional carrier. The composite membrane realizes high-efficiency adsorption of ethylene released by fruits and vegetables in a storage period through a porous structure of ZIF-8, and simultaneously forms a synergistic effect with pectase by utilizing an acidic environment naturally generated in a mature and putrefaction process of fruits and vegetables, so that intelligent slow release of cinnamaldehyde loaded on the ZIF-8 is accurately triggered, and the cinnamaldehyde can form a double-channel intelligent antibacterial system with natural antibacterial performance of chitosan in a membrane substrate and antibacterial characteristics of metal ions of the ZIF-8. However, the high volatility of cinnamaldehyde causes rapid loss of active ingredients, and the hydrophobic property of essential oil causes difficulty in dispersing the essential oil in an aqueous phase system. These drawbacks severely limit its use in the food industry on a large scale. Therefore, a composite membrane containing MOFs material and cinnamaldehyde needs to be developed, so that the problems of strong smell caused by volatilization of the cinnamaldehyde, rapid volatilization of the cinnamaldehyde, difficult dispersion in a water phase system and the like can be avoided, and slow-release bacteriostasis can be realized. Disclosure of Invention Aiming at the prior art, the invention aims to provide a slow-release antibacterial and antioxidant composite film and application thereof in preserving livestock and poultry precast vegetables. The invention takes starch, chitosan, glycerol and ZIF-8@CIN as raw materials to prepare the composite film with slow-release antibacterial and antioxidant functions, and can be used for preserving livestock and poultry precast vegetables. In order to achieve the above purpose, the invention adopts the following technical scheme: The invention provides a slow-release antibacterial and antioxidant composite film which sequentially comprises a first outer layer, a functional inner layer and a second outer layer from top to bottom, wherein the first outer layer and the second outer layer both contain polyvinyl butyral and ethylcellulose, and the functional inner layer contains ZIF & # x2011, 8@cinnamaldehyde, starch, glycerol and chitosan. Preferably, the thickness of the first outer layer and the second outer layer is 0.05 mm a. Preferably, the thickness of the functional inner layer is 0.06 mm a. Preferably, the slow-release antibacterial and antioxidant composite film is prepared by the following method: (1) Dissolving polyvinyl butyral and ethyl cellulose in absolute ethyl alco