A kind of preparation method and application of biodegradable antioxidant fruit and vegetable fresh-keeping film

Abstract

The invention discloses a preparation method and an application of a biodegradable anti-oxidation fruit and vegetable fresh-keeping film, belonging to the field of biodegradable food film processing. The preparation method of the fresh-keeping film for fruits and vegetables comprises the following steps: mixing starch, glycerin, organically modified montmorillonite and quercetin to obtain a modified powder, mixing and granulating the modified powder with PBAT to obtain composite pellets, and then blowing Biodegradable anti-oxidation fruit and vegetable fresh-keeping film can be obtained by plasticizing it. The fruit and vegetable plastic wrap prepared by the above method uses PBAT and starch as the base material, and the raw materials are all biodegradable materials. After being discarded, they can be disposed of by composting, soil landfill, etc. It is green and environmentally friendly, in line with the concept of sustainable development, and has mechanical properties. Strong, high barrier, good anti-oxidation, good fresh-keeping performance, green and non-toxic.

Description

technical field [0001] The invention relates to a preparation method and application of a biodegradable anti-oxidation fruit and vegetable fresh-keeping film, belonging to the field of biodegradable food film processing. Background technique [0002] The harvested fruits and vegetables are still undergoing vigorous physiological activities. With the progress of respiration, the temperature of the storage environment of fruits and vegetables increases, which leads to wilting on the surface and reduces the quality of fruits and vegetables. In addition, the ethylene accompanying the ripening of fruits and vegetables will further promote freshness. Fruits are ripe and aging, so according to these physiological characteristics of harvested fruits and vegetables, people often use plastic wrap to wrap them to achieve the purpose of reducing metabolism and preventing corruption and aging. [0003] Fruit and vegetable fresh-keeping film is a functional film, which mainly relies on th...

AI Technical Summary

Problems solved by technology

[0003] Fruit and vegetable fresh-keeping film is a functional film, which mainly relies on the air permeability of the film to minimize the oxygen concentration, inhibit respiratory consumption and delay the aging of fruits and vegetables. Although the traditional functional fresh-keeping film can play the role of packaging, it is obviously not enough. The preservation needs of the modern market, in the existing research, in order to achieve the purpose of better preservation, some substances that can absorb or inhibit the production of various gases of fruits and vegetables are usually added in the preparation process of the plastic wrap to prevent the effects of ripening and aging Produced, such as tuff, zeolite, quartz stone, hygroscopic agent calcium chloride, etc., but the addition of granular substances will reduce the mechanical properties of the plastic wrap; in addition, in order to prevent food oxidation and microbial contamination, some antibacterial materials will also be added to the film. However, conventionally used synthetic antioxidants (such as tert-butylhydroquinone, butylated hydroxytoluene and butylated hydroxyanisole, propyl gallate) and antibacterial agents (such as sorbic and benzoic acids, benzene Sodium formate) is toxic, carcinogenic and mutagenic, long-term coating on the surface of fruits and vegetables will penetrate into the interior of fruits and vegetables, causing certain impacts on human health; with the enhancement of people's awareness of environmental protection, research has introduced degradable fruit and vegetable films, of which starch ( St) as a kind of renewable, fully biodegradable product, its source is rich, cheap, but the elongation at break is low, so the prior art usually combines starch with thermoplastic degradable plastics (especially butylene adipate) Alcohol ester and butylene terephthalate copolymer, PBAT) composite, using the good ductility and elongation at break of PBAT, and good film-forming properties, etc., to prepare a starch / PBAT composite material, although starch / PBAT composites have great advantages in forming biodegradable films, but there are some limitations in making them competitive materials considering their high permeability to oxygen, water vapor

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