Degradable antibacterial composite preservative film as well as preparation method and application thereof

A composite fresh-keeping and composite film technology, applied in the field of food packaging materials, can solve the problems of poor anti-oxidation and antibacterial effects of a single chitosan film

Inactive Publication Date: 2021-09-14
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the single-component antibacterial plastic wrap has many limitations in performance, such as the poor anti-oxidation and antibacterial effects of a single chitosan film.

Method used

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  • Degradable antibacterial composite preservative film as well as preparation method and application thereof
  • Degradable antibacterial composite preservative film as well as preparation method and application thereof
  • Degradable antibacterial composite preservative film as well as preparation method and application thereof

Examples

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preparation example Construction

[0031] The invention provides a preparation method of a degradable antibacterial composite plastic wrap, comprising the following steps:

[0032] After mixing the chitosan acetic acid solution and the first glycerin, casting on the carrier to form a chitosan film;

[0033] Casting the tannic acid solution on the chitosan film to obtain a chitosan-tannic acid composite film;

[0034] After mixing the cornstarch solution and the second glycerin, it is cast on the chitosan-tannic acid composite film to obtain a degradable antibacterial composite fresh-keeping film.

[0035] Unless otherwise specified, the present invention has no special requirements on the sources of the raw materials used for the preparation, and commercially available products well known to those skilled in the art can be used.

[0036] In the invention, after mixing the chitosan acetic acid solution and the first glycerin, the chitosan film is cast on the carrier to form the chitosan film.

[0037] In the p...

Embodiment 1

[0066] Weigh 10 g of corn starch and add it to a beaker filled with 200 mL of distilled water, heat in a boiling water bath until the starch is completely gelatinized, cool to 50°C and set aside to obtain a corn starch solution with a mass concentration of 50 g / L;

[0067] Weigh 2.5g of chitosan and add it into 200mL of 2% acetic acid, stir magnetically at 30rpm for 12h to obtain a chitosan solution with a mass concentration of 12.5g / L;

[0068] Weigh 1g of tannic acid and dissolve it in 100mL of distilled water to obtain a tannic acid solution with a mass concentration of 10g / L;

[0069] After mixing 20mL of 12.5g / L chitosan solution and 0.175g of glycerin, cast it on a glass plate and dry it at 45°C for 2h to form a chitosan film; then, cast 20mL of 10g / L tannic acid solution on it , dried at 45°C for 2h to obtain a chitosan-tannic acid composite film; finally, after mixing 20mL of 50g / L cornstarch solution and 0.7g glycerin, cast the chitosan-tannic acid composite film and ...

Embodiment 2

[0071] The difference with embodiment 1 is that the mass concentration of chitosan acetic acid solution is 15g / L, and all the other contents are consistent with embodiment 1.

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Abstract

The invention belongs to the technical field of food packaging materials, and particularly relates to a degradable antibacterial composite preservative film as well as a preparation method and application thereof. The degradable antibacterial composite preservative film is prepared by sequentially casting a chitosan acetic acid solution, a tannic acid solution and a corn starch solution by adopting a layer-by-layer assembly casting method. The degradable antibacterial composite preservative film comprises a chitosan and tannic acid composite film with a phenol-amine network structure formed by covalent crosslinking of chitosan and tannic acid, and a corn starch film bonded with the chitosan and tannic acid composite film through hydrogen bonds. The degradable antibacterial composite preservative film prepared by the preparation method disclosed by the invention has very strong antibacterial ability and antioxidant ability.

Description

technical field [0001] The invention belongs to the technical field of food packaging materials, and in particular relates to a degradable antibacterial composite fresh-keeping film and a preparation method and application thereof. Background technique [0002] Antibacterial fresh-keeping film refers to a coating or film made by adding antibacterial agents to film-forming materials. It can be used as a carrier of various food antioxidants and antibacterial agents, and has a fresh-keeping function for food. Due to the high efficiency, stability and safety of antibacterial plastic wrap, more and more attention has been paid to it, and it has broad application prospects in food packaging and fresh-keeping. The traditional antibacterial plastic wrap is made of petroleum-based raw materials, which are not easy to degrade, and compared with ordinary plastics, its material is thinner and its shape is not fixed. For hygiene, it is rarely reused and it is difficult to recycle. . Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23L3/3562A23L3/3544A23B7/16A23B7/154B65D65/40B65D65/46C08J7/04C08L5/08C09D197/00C09D103/02
CPCA23L3/3562A23L3/3544A23B7/16A23B7/154B65D65/40B65D65/46C08J7/042A23V2002/00C08J2305/08C08J2497/00C08J2403/02A23V2200/02A23V2200/10A23V2250/511Y02W90/10Y02A40/90
Inventor 孙庆杰赵爽爽姬娜杨洁熊柳周历阳崔聪俐代蕾
Owner QINGDAO AGRI UNIV
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