Fresh fruits and vegetables are fresh products

Fresh fruits and vegetables are fresh, rich in water, and need to breathe. They are still living organisms. On the surface, the listed vegetables seem to stop life activities, but in fact they are still undergoing complex physiological changes, biological changes and physical changes. At the same time, with these changes, the nutritional composition and food value of fruits and vegetables have also changed accordingly. Fresh fruits and vegetables have respiration. After the respiration process of fruits and vegetables is the absorption of oxygen from the surrounding air, the organic matter in the tissue is slowly decomposed into carbon dioxide and water under the action of enzymes, and the process of releasing heat is the process of nutrient consumption. For some fresh fruit, after the fruit leaves the plant through the respiratory process, after the completion of ripening effect, a series of changes in the flavor and physiological characteristics of the fruit, for the improvement of the fresh fruit is of great significance. However, when the fresh fruit reaches maturity, it loses its storability. Fresh fruits and vegetables are prone to moisture evaporation and condensation. The phenomenon of moisture evaporation and condensation that occurs in fruits and vegetables is a physical change. Evaporation will reduce the internal water content of the fruits and vegetables, which not only makes the appearance of the vegetables show a hospital spasm state, affect its fresh quality, but also will cause the respiration of fruits and vegetables to strengthen, increase the consumption of nutrients. Dew condensation is caused by the sharp change of air temperature and humidity in the environment of fruits and vegetables, and the phenomenon of condensed fine water droplets on the surface of fruits and vegetables, commonly known as "sweat." After the dew condensation on the surface of fruits and vegetables, it is very moist and creates suitable conditions for the reproduction of microorganisms. It is easy for fruits and vegetables to rot and deteriorate. In view of this, fresh fruits and vegetables are alive and belong to fresh commodities. Therefore, fresh fruits and vegetables cannot be treated as general commodities. Appropriate measures must be taken to create a good storage environment and control the life activities of fresh fruits and vegetables so that fresh fruits and vegetables can fully utilize their edible value.