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Preparation method of PVA-based food packaging film with anti-oxidation and anti-ultraviolet functions

A technology of food packaging film and functional food, which is applied in the field of preparation of PVA-based food packaging film, can solve the problems of not having anti-oxidation and anti-ultraviolet properties, and achieve enhanced anti-ultraviolet properties, good biocompatibility and degradability, Effect of UV resistance improvement

Inactive Publication Date: 2020-01-10
NORTHEAST FORESTRY UNIVERSITY
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  • Claims
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Problems solved by technology

Polyvinyl alcohol (PVA) is a high-strength biodegradable synthetic material with good tensile strength and light transmittance, but it does not have anti-oxidation and anti-ultraviolet properties

Method used

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  • Preparation method of PVA-based food packaging film with anti-oxidation and anti-ultraviolet functions
  • Preparation method of PVA-based food packaging film with anti-oxidation and anti-ultraviolet functions

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specific Embodiment approach 3

[0014] Specific implementation method three: take 80 mesh grape seeds, extract them with 70% ethanol solution, the ratio of solid to liquid is 1:10, ultrasonically clean them for 30 minutes in an ultrasonic cleaning machine at room temperature, and then extract them in a constant temperature system at 55°C for 2.5 hours. The precipitate was removed by filtration, and the extract was concentrated by rotary evaporation. Weigh 1 g of PVA and add 50 mL of distilled water, heat and stir until the PVA is completely dissolved to obtain a 2% PVA solution. The grape seed polyphenol concentrate and the PVA solution are uniformly mixed at a solid mass ratio of 5%, poured into a glass tank, and dried naturally at room temperature to obtain a PVA-based food packaging film with anti-oxidation and anti-ultraviolet functions.

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Abstract

The invention discloses a preparation method of a PVA-based food packaging film with anti-oxidation and anti-ultraviolet functions. A purpose of the invention is to provide a safe and pollution-free anti-oxidation and anti-ultraviolet green food packaging functional material. The preparation method comprises: (1) preparation of raw materials: selecting plant polyphenol-rich raw materials, and crushing and screening the large-block raw materials; (2) extraction of plant polyphenol: extracting the phenol-based substances from the prepared raw materials by using a solvent extraction method; (3) preparation of a PVA solution: mixing PVA and water according to a certain ratio, and heating and stirring until PVA is completely dissolved to obtain a PVA solution; and (4) preparation of a plant polyphenol / PVA composite membrane: dissolving the plant polyphenol with a small amount of an ethanol-water mixed solution at a room temperature, mixing the solution and the PVA solution according to a certain ratio, uniformly stirring to obtain a plant polyphenol / PVA membrane solution, and performing casting to obtain the plant polyphenol / PVA composite membrane. Compared with the pure PVA film, the plant polyphenol / PVA composite film prepared by the method disclosed by the invention has the significantly improved anti-oxidation performance and the significantly improved anti-ultraviolet performance. The PVA-based food packaging film of the invention has good application prospect in the field of food packaging materials.

Description

technical field [0001] The invention relates to a preparation method of a PVA-based food packaging film, in particular to a preparation method of a food packaging film with anti-oxidation and anti-ultraviolet functions. Background technique [0002] Food packaging is an important part of food. Food is prone to oxidation and spoilage. Antioxidation is a key function of active packaging materials, and antioxidant packaging materials are very helpful to extend the shelf life of food. Ultraviolet (UV) can also promote the oxidative degradation of food, and food packaging materials with anti-oxidation and anti-ultraviolet radiation properties are very important. Considering the direct contact of some packaging materials with food, these natural products can be better used in food packaging materials. [0003] Plant polyphenols are known as natural antioxidants and also have anti-UV properties. Plant polyphenols are the main components of plant extracts. As a kind of abundant ...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L29/04C08K5/04
CPCC08J5/18C08J2329/04C08K5/04
Inventor 李淑君翟迎香王江涛王昊宋涛胡蔚同
Owner NORTHEAST FORESTRY UNIVERSITY
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