Apple preservation tips How to extend the shelf life of apples

The high temperature in summer is very suitable for bacterial growth. How can we keep our Pingguo fresh? Let's learn together

The food we leave behind can become a habitat for bacteria in a short period of time. Summer is a good season for eating fruits, but the high temperature will accelerate their deterioration. At this time, the refrigerator becomes a "protective umbrella". How to keep fruits and vegetables in the refrigerator ventilated and fresh and delicious is very particular.

It is best to put it in a fresh-keeping bag or plastic wrap

Fruits and vegetables cannot be eaten all at once and need to be stored in the refrigerator. However, many people believe that putting fruits and vegetables naked in the refrigerator will allow for better ventilation and extend their shelf life.

In fact, this is not the case. Generally, fruits and vegetables contain a lot of water. If there is no packaging bag, the evaporated water will be continuously absorbed by the refrigerator's evaporator, accelerating frost. Repeatedly, not only will the fruits and vegetables become drier and drier, but it will also cause excessive frost in the refrigerator, affecting its service life.

Therefore, Dong Jinshi, executive vice president and secretary general of the International Food Packaging Association, suggested in an interview with reporters that it is best to put fruits and vegetables in a fresh-keeping bag or wrap them with plastic wrap before putting them in the refrigerator. Regarding the common packaging products on the market, such as plastic wrap and fresh-keeping bags, Dong Jinshi said that fresh-keeping is mainly about retaining water, quality and protecting nutrients. In this regard, plastic wrap has the best effect. Qualified plastic wrap has strong air permeability, and oxygen can circulate inside and outside, effectively preventing the reproduction of anaerobic bacteria, and can ensure the freshness of fruits and vegetables within a certain period of time. However, fresh-keeping bags are relatively thick and have relatively poor air permeability. When using, try not to seal the mouth. It should be warned that if you go to the farmer's market or supermarket to buy fruits and vegetables, it is best to put them in a fresh-keeping bag or wrap them with plastic wrap after returning, and then put them in the refrigerator. Qualified food bags in supermarkets have poor air permeability and are not suitable for preserving fruits and vegetables. Many plastic bags in farmers' markets are of poor quality, especially those with colors, which are unsafe for storing food. Fan Zhihong, associate professor at the School of Food Science and Engineering at China Agricultural University, pointed out that if you want to make fruits and vegetables more breathable, you can also try kraft paper bags. Fruits and vegetables will lose moisture and nutrients in the refrigerator, and kraft paper has strong water absorption and can absorb the evaporated moisture from fruits and vegetables and return it to them.

Do not wash before putting in the refrigerator

After washing, fruits and vegetables will have a lot of water. Fruits and vegetables will produce carbon dioxide when they "breathe". If they are sealed again, the air permeability will deteriorate, which will accelerate the deterioration of food. In addition, the surface of fruits and vegetables, especially melons and fruits, has a layer of wax that can protect them from microorganisms, but washing will destroy this protective film. If you must wash them, wait until the water is completely drained before putting them in the refrigerator. Washed fruits should also be washed again after taking them out of the refrigerator to remove nitrites produced during storage. It depends on the nature of the fruits and vegetables. The freshness of fruits and vegetables themselves is different. Some can be put in the refrigerator immediately, while others cannot. For example, green leafy vegetables are easy to wilt in hot weather. To keep them fresh, you can put a fresh-keeping bag on the outside and put them in the refrigerator immediately. The temperature should be controlled between 0-4 degrees Celsius.

Preserving freshly picked apples

If you have freshly picked peaches or apples, it is best to place them at room temperature for half a day to a day before wrapping them in kraft paper or plastic wrap and putting them in the refrigerator to avoid affecting the taste. If uneaten watermelons are refrigerated for a long time, a film will form on the surface of the melon pulp, which will reduce the taste. Therefore, it is best to buy them now. Bananas, tomatoes, etc. can be stored at room temperature. Finally, it is best not to store fruits and vegetables in the refrigerator for more than 3 days, otherwise a lot of nutrients will be lost.