1, cooling method, generally used for fruits with extremely short shelf life; For example, litchi preservation should not be put in the fresh-keeping cabinet to remind everyone. It is best to keep it in the freezing layer below zero, and let it thaw naturally after taking it out, because only in this way can the color, fragrance and taste of litchi be effectively preserved;
2, fresh-keeping bag insurance law, generally used for thick skin; Like watermelon, just cover the surface of watermelon with plastic wrap. In fact, it is not right to keep watermelons fresh like this, because they look very easy in cake cabinet. But in fact, the deli cabinet will absorb water from watermelon skin, so it is useless to cover it with plastic wrap. Therefore, watermelon preservation should be wrapped with plastic wrap, and the skin should be wrapped with plastic wrap together. Then the air is squeezed out;
3, normal temperature packaging preservation method, generally used for fruits that cannot be cooled and are perishable; For example, papaya and papaya are also fruits that can't be kept in the refrigerator. There will be black spots. Although the display cabinet can absorb water, once it is taken out of the refrigerated display cabinet, the temperature difference will produce moisture on the surface of papaya and produce stale black spots. Put it in a cool place. So papaya can be preserved for a long time. The correct way to preserve papaya is to wrap it in newspaper and keep it fresh all the time.
The reason why fruit is difficult to clean is mainly because of its rough appearance and thin skin, which will break when washed.
So many people simply use water to eat in order to save trouble. In fact, fruits belong to plants, the plants are relatively low, the fruits are tender and juicy, and they are vulnerable to diseases, insect pests and microorganisms. Therefore, in the process of planting fruits, pesticides should be used frequently.
These pesticides, fertilizers and germs easily attach to the rough surface of fruits. If it is not cleaned, it is likely to cause diarrhea and even pesticide poisoning. To wash the fruit clean, it is best to rinse it continuously with tap water. Flowing water can prevent pesticides from infiltrating into fruits. Don't eat washed fruit right away. It is best to soak in silkworm bixiao for 5 minutes. Silkworm must eliminate energy to kill harmful microorganisms remaining on the surface of fruits; Residual water is alkaline and can promote the degradation of acidic pesticides. When washing fruit, be careful not to take off the stem. If the pedicled fruit is soaked in water, the residual pesticides will enter the fruit with the water, causing more serious pollution. In addition, don't soak the fruit with detergents such as detergent. These substances are difficult to clean and easy to remain in fruits, causing secondary pollution.
References:
Web page link fruit Baidu encyclopedia