A kind of anti-ultraviolet fruit and vegetable fresh-keeping film, preparation method and application in fruit and vegetable bagging

Abstract

The invention discloses an anti-ultraviolet fruit and vegetable fresh-keeping film, a preparation process and an application in fruit and vegetable bagging. The raw materials of the anti-ultraviolet fruit and vegetable fresh-keeping film include 99.5%-99.9% LDPE and 0.1%-0.5% molybdovanadoxate metal clusters. The molybdovanadoxate metal cluster compound can absorb ultraviolet light in the wavelength range of 200-380 nm. The anti-ultraviolet fruit and vegetable fresh-keeping film is made by adding a small amount of molybdovanadoxate metal clusters to LDPE, and then co-extruded with LDPE to form a three-layer film. In the anti-ultraviolet fruit and vegetable fresh-keeping film of the present invention, the added molybdenum vanadoxate metal clusters do not migrate or dye, and are made into protective packaging for fruit bagging, which can not only reduce 74% of ultraviolet light reaching the fruit and vegetable skin, It also has good air permeability and moisture permeability, thereby reducing the sunburn that occurs after the fruit is exposed to high temperature and strong light in a short period of time, and is suitable for protective packaging of fruits and vegetables before picking.

Description

technical field [0001] The invention belongs to the technical field of food preservation, and in particular relates to an anti-ultraviolet fruit fresh-keeping film, a preparation method and an application in fruit and vegetable bagging. Background technique [0002] After the fruit receives the damage of high temperature and strong light in a short period of time, "sunburn" will appear soon. Sunburn occurs widely on many fruits, vegetables, and even tea plants. The more serious cases include apples, grapes, and pomegranates. Sunburn generally occurs in tropical, subtropical and temperate regions, and solar radiation is its main direct cause. When plant sunburn occurs seriously, necrotic plaques of different sizes will appear in the economical parts, making the fruits lose their edible value. Even a moderate degree of sunburn can cause abnormal patches such as yellow, brown, and white to appear on the fruit surface, which greatly reduces the appearance quality of the fruit....

AI Technical Summary

Problems solved by technology

However, inappropriate bagging will lead to high temperature, poor ventilation, and excessive humidity in the bag, which will worsen the environment in the bag and aggravate the occurrence of fruit injuries. Therefore, inappropriate bagging will be counterproductive

Dye-dyed bagging may cause organic small molecule dyes to migrate to the fruit under high humidity conditions, causing unintended dyeing of the fruit

However, the cost of paper-plastic composite bagging is relatively high, which increases production costs.

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