Ultraviolet-proof fruit and vegetable preservative film, preparation process, and application of preservative film in fruit and vegetable bagging

Abstract

The invention discloses an ultraviolet-proof fruit and vegetable preservative film, a preparation process, and an application of the preservative film in fruit and vegetable bagging. The ultraviolet-proof fruit and vegetable preservative film comprises the following raw materials: 99.5-99.9% of low-density polyethylene (LDPE) and 0.1-0.5% of a molybdenum-vanadate polyoxometalate metal cluster. Themolybdenum-vanadate polyoxometalate metal cluster can absorb ultraviolet light in a wavelength range of 200-380 nm. The ultraviolet-proof fruit and vegetable preservative film is prepared by the following steps: adding a small amount of the molybdenum-vanadate polyoxometalate metal cluster into the LDPE, and then carrying out co-extrusion blow-molding with the LDPE to form the three-layer film. According to the ultraviolet-proof fruit and vegetable preservative film disclosed by the invention, the added molybdenum-vanadate polyoxometalate metal cluster does not migrate and is not dyed, and when the molybdenum-vanadate polyoxometalate metal cluster is prepared into protective package for fruit bagging, ultraviolet light reaching fruit and vegetable skins can be reduced by 74%, and good airpermeability and moisture permeability are also achieved, so that sunburn caused by the fact that fruits are damaged by high-temperature strong light in a short time is reduced. Therefore, the preservative film is suitable for protective package of the 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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