Mildew of the cargo 2021-06-20 18:42:49 (1) Mildew of the cargo The mildew phenomenon of the cargo is that the nutrients of the cargo are converted into various metabolites under the action of the mildew microorganisms, and the mold appears , Rot, odor and other quality changes. (2) Influencing factors of mildew of cargoes The main mildew microorganisms that have a greater impact on cargoes are: bacteria, molds and yeasts. Bacteria mainly destroy animal and plant foods with high water content. Yeasts mainly cause the fermentation and deterioration of substances containing starch and sugars. Both of them also affect daily industrial products. The main harm of mold-rot microorganisms to cargo is damage to cargo through growth and reproduction and contamination of cargo by excrement. The growth and reproduction of mildew microorganisms require certain external environmental conditions, and the goods are prone to mildew when these conditions are met. In the storage management of items, the following factors need to be considered to control and avoid the growth of mold rotting microorganisms: 1. The air humidity in the warehouse When the external environmental humidity is compatible with the growth requirements of mold rotting microorganisms, mold rotting microorganisms multiply vigorously. ; On the contrary, it is in a dormant or dead state. The most suitable relative humidity for the growth and reproduction of most mold-rot microorganisms is 20%~90%. Under the condition of relative humidity lower than 75%, most molds cannot develop normally. Therefore, the relative humidity of 75% is usually referred to as the critical humidity for mildew of cargo. 2. Warehouse temperature The control of warehouse temperature should not only pay attention to the temperature inside and outside the warehouse, but also pay attention to the temperature of the stored materials-stack temperature. The growth and reproduction of mold-rot microorganisms have a certain temperature range, and both high temperature and low temperature will have a great impact on their growth. Most mold-rot microorganisms are moderately temperature microorganisms. The most suitable growth temperature is 20-30°C. They are not easy to grow below 10°C, and stop growing above 45°C. 3. Light Sunlight has an effect on most microorganisms, and ultraviolet rays in sunlight can strongly damage microbial cells and enzymes. Most mold and rotting microorganisms die under direct sunlight for 4 hours. 4. Air composition Some microorganisms, especially molds, need to grow normally under aerobic conditions. The increase in carbon dioxide concentration is not conducive to the growth of microorganisms; some microorganisms are anaerobic and cannot survive under oxygen or sufficient oxygen conditions. Ventilation can prevent mildew of some goods, mainly to prevent mildew caused by anaerobic microorganisms.