Can fruits and vegetables be stored in plastic bags for a long time?

　　Can fruits and vegetables be stored in plastic bags for a long time?

　　Storing vegetables and fruits in plastic bags is a very common way for people to keep them fresh.

　　The principle is to reduce the concentration of oxygen and increase the concentration of carbon dioxide to put fruits and vegetables in a dormant state and extend the storage period. However, the storage time should not be too long.

　　Vegetables and fruits are organic foods with high water content (60%--95%) and water-soluble nutrients and enzymes. Strong respiratory activity continued throughout the storage period. Under normal circumstances, the respiration intensity doubles for every 10 degrees Celsius rise. Under aerobic conditions, sugars or other organic substances in fruits and vegetables are oxidized and decomposed to produce carbon dioxide and water, and release a large amount of cooked food; under nutrient-deficient conditions, sugars cannot be oxidized and can only decompose to produce alcohol, carbon dioxide, and release a small amount of heat.

　　However, carbon dioxide concentration cannot rise indefinitely, it can only increase by 10%. The decrease in oxygen concentration cannot exceed 5%, otherwise the fruit must decompose more nutrients in order to obtain sufficient energy for life activities when it is deprived of oxygen. At the same time, alcohol produced due to lack of oxygen respiration remains in the fruit sparse, which will cause the fruit sparse to rot and deteriorate. Therefore, fruits and vegetables should not be stored in plastic bags for too long.

　　If you want to store fruits and vegetables in plastic bags, please don't be afraid of trouble. Open the mouth of the plastic bag every two or three days to release carbon dioxide and heat, and then tie the mouth closed. This will reduce the occurrence of rot and deterioration.

　　Do not store tropical fruits in the refrigerator

　　Various tropical fruits such as dragon fruit, mango, lychee, longan, papaya, rambutan, etc. Once these fruits are placed in the refrigerator after being bought home, their skins will begin to dent and dark brown spots will appear within a few days, which indicates that the fruits have been frostbitten.

　　Most tropical fruits are sensitive to cold and should not be kept in the refrigerator. Frostbitten fruits not only have their nutrients destroyed, but also easily deteriorate. In a few days, the pulp will rot.

　　Generally speaking, temperate zone fruits, such as Grape , apples, pears, etc. placed in the refrigerator can play a role in keeping them fresh. When bananas and mangoes are stored at 10°C, the peel will turn black; when pineapples are stored at 6°C to 10°C, not only the peel will change color, but the pulp will also become water-soaked; when lychees, longans, rambutan, etc. are stored at 1°C to 2°C, the color of the outer peel will darken and the endocarp will have spots like burns. Such fruits often cannot be eaten anymore.

　　Tropical fruits are best stored in a dark, cool place. If it must be placed in the refrigerator, it should be placed in a vegetable and fruit tank with a higher temperature. It is best not to store it for more than two days.