When it comes to the preservation of ingredients, I believe that most people will immediately think of the refrigerator, the "guardian" who guards the safety of ingredients day and night. However, with more and more kinds of ingredients, more and more people find that although refrigerators can create a low-temperature environment, the preservation effect is not ideal, and many problems such as decay, discoloration and odor follow. As a result, manufacturers have introduced vacuum fresh-keeping refrigerators, so is the fresh-keeping effect really better than that of ordinary refrigerators? Let's take a look together. In low temperature environment, some enzymes in food can still maintain high activity, thus accelerating the oxidative deterioration of food raw materials and leading to the loss of nutrients. Vacuum preservation is to preserve food in a vacuum environment to achieve the purpose of prolonging the storage time of food. The refrigerator keeps the vacuum environment at a negative pressure of about -220 millibar (Hauba) and the air pressure of the environment at about 0.8 atmospheric pressure. The oxygen content in the "box" is extremely scarce, which effectively inhibits the oxidation of active enzymes in food, while maintaining the activity of food cells without destroying the cell wall. In a vacuum environment, oxygen is thin, which greatly delays the oxidation process of food; At the same time, the ripening gases emitted by fruits and vegetables are also greatly reduced, thus delaying food spoilage. The food stored in vacuum fresh-keeping box is superior to the food stored under normal fresh-keeping conditions in color, fragrance and moisture, and the nutrients such as vitamins contained in the food are also better preserved. The vacuum preservation effect of fruits, vegetables, meat and fish is particularly obvious.

From the comparison of the above pictures, we can clearly see many benefits of vacuum preservation.

At present, the brands of vacuum refrigerators are: Hitachi, Hisense and so on.

It is not difficult to see from the above picture, or it can be understood that the vacuum refrigerator adds a vacuum pump on the basis of the original refrigerator.

Vacuum refrigerator can be said to be a dark horse in the field of refrigerator, and of course it is also the trend of future development. With more and more people demanding higher and higher quality of life, and the quality of food is also the object of people's concern, then vacuum refrigerators will definitely enter thousands of households.