1, carton preservation:
If there are many idle cartons at home, you can keep sweet potatoes in cartons. If there is a lot of soil on the surface of sweet potato, clean the surface of sweet potato first. Don't wash sweet potatoes in water. Moisture makes sweet potatoes germinate easily. Just pat the dirt off with your hands.
Spread a layer of paper under the carton first, and then put in the sweet potatoes. Don't put all the sweet potatoes at once, but spread a layer of paper and put in new sweet potatoes. Fill the cartons in the order of paper-sweet potato-paper. The top layer of the carton must be covered with paper. When finished, seal the carton and put it in a dry place. This method can reduce the contact area between sweet potato and moisture in the air, prevent sweet potato from sprouting after absorbing moisture, and slow down the oxidation process of sweet potato.
2, plastic bag preservation:
It is the simplest and most convenient way to store sweet potatoes in plastic bags. Clean the surface of the sweet potato first, then find a relatively large plastic bag, wrap it tightly with old newspapers, kitchen paper and other papers, and then put it into the plastic bag and tie it tightly. Remember to squeeze the air out of the bag before tying it tightly, and then put the sweet potato in a dry place. Paper can isolate the external moisture, and at the same time avoid the original moisture loss of sweet potatoes, keep them fresh and avoid the germination of sweet potatoes.
3, refrigerator storage:
Before putting it in the refrigerator, clean the dirt on the surface of sweet potato slightly, then wrap it tightly with plastic wrap and put it in the refrigerator. Plastic wrap can slow down the water loss rate of sweet potatoes, but the temperature of the refrigerator should be kept at about 5℃, and sweet potatoes should not be stored for a long time. Because sweet potatoes are stored in a low temperature environment for a long time, they are easy to be frostbitten, which leads to the destruction or stop of cells in sweet potatoes, which leads to the decay and deterioration of sweet potatoes from the inside.
Selection method of sweet potato:
1, look at the color:
Fresh sweet potato skin is shiny and brightly colored, and the skin is generally solid, without any spots or yellow. If there are some spots or yellow blocks on the surface, it means that sweet potatoes will last for a long time, so don't buy them well.
2, look at the appearance:
When we buy sweet potatoes, we can see if there are moldy places or cracks on the surface of sweet potatoes. The gap can easily make bacteria enter the sweet potato, thus making the sweet potato deteriorate from the inside. If it is moldy, it means that the sweet potato has been here for a long time and belongs to the spoiled sweet potato. We'd better not buy it.
3. Look at the epidermis:
If the skin of sweet potato is rough, it may be left for a long time. There is not much water in sweet potato, so the nutrition is almost lost and the taste is poor. It's best not to buy it.