New "hard core" technology for food preservation of long fresh-keeping
Update:2019-07-29 Page View:2367

Summer is coming, the temperature is getting higher, and all kinds of bacteria and microorganisms grow and multiply faster. Whether fruit, vegetable, food, etc. are stored, transported or put in the meal at home, it is easy to deteriorate and rot. It is understood that more than 1 billion tons of food are thrown away every year due to improper preservation, storage and transportation, resulting in decay and deterioration. The waste value is 580 billion euros, equivalent to 2 billion people's food is wasted. Indeed, food preservation technology and equipment can extend the shelf life, container life and reduce food waste by blocking oxygen and monitoring the temperature of fresh fruits.

Coating to keep fresh

It is reported that a company has introduced a "stealth coating" which can be applied to the skin of fruits and vegetables to maintain freshness and reduce wastage. According to reports, "invisible coating" is mainly made of plant-derived materials, which can provide good sealing protection. It can not only facilitate the storage and transportation of fruits and vegetables, improve transportability, but also slow down the water loss and oxidation process, and greatly extend the shelf life of fresh fruits and vegetables. More importantly, fruits and vegetables through the "invisible coating" do not necessarily need to be refrigerated, to ensure the fresh quality of fruits and vegetables, but also greatly reduce wastage.

Moreover, a new nano-coating spraying technology has been developed by a scientific and technological research institute. Spraying the coating on the surface of fruits and vegetables can extend its shelf life for several weeks. And the coating spraying speed is fast, the coating spraying process only takes 5 seconds, while not necessarily refrigerated storage, stored at 25 degrees C for 28 days, it is still edible.

Fruit and vegetable temp recording

Because of the high moisture content and sensitivity to temperature of fruits and vegetables, and the great change of temperature during storage and transportation, it is difficult to control. The decay rate of fruits and vegetables in China has been high all along. The loss of fruits and vegetables after harvest is as high as 20%-30%, and the direct loss of fruits and vegetables decay in China is as high as 100 billion yuan a year. The reasons include inaccurate control of storage and transportation temperature and accelerated product decay.

It is understood that a company has independently developed a data recorder which will be displayed at an exhibition. The author learns that this instrument is very suitable for monitoring the transportation process of fresh fruits and other temperature sensitive products. Just insert it into the container or package for fruit and vegetable transportation, and it can record the situation of different time periods during transportation. It can prolong the storage time of food materials, reduce the waste of food, and also achieve environmental protection.

Anti-bacterial aluminum packing tech

Recently, a company has developed a new technology for long-term preservation of rice in sterile condition, which can keep rice balls for 5 years and can be eaten instantly without heating. According to the relevant personnel, the technology is mainly used to steam rice under certain conditions, then mix specific enzymes into rice balls, then use four layers of aluminum film to shield oxygen for packaging, then roast at high temperature, and then use deoxidizer to fill the packaging bag with nitrogen. In addition, the application of aluminium film packaging bags for long-term preservation of bread products has been developed, which greatly prolongs the shelf life of food.

Vacuum fresh-keeping

According to reports, a vacuum fresh-keeping box appeared in the foreign market. It looks like a receipt box. Its size is comparable to that of common printers. It will not take up much space whether it is in the kitchen or in the living room. Generally speaking, the air can be discharged from the bottom of the box by simply putting the stored food directly into the suction system similar to the vacuum cleaner inside. Because bacterial reproduction, enzymes and chemical reactions are greatly weakened in an anaerobic environment, the box can extend the shelf life by five times.

Intelligent food packing label

Most people have the habit of storing large quantities of food in the refrigerator, which will slowly lose freshness in the refrigerator, then expire and deteriorate, causing waste, but this process is often unknown. In this regard, a smart food preservation label began to appear in people's vision, which can help users understand the freshness of food, and remind users to eat food in time.

The author understands that each label has a button and LED halo. Green means that the food is fresh, yellow means that the food is still fresh but needs to be eaten as soon as possible, and red means that the food is out of date and can not be eaten. At the same time, the smart label will calculate the freshness according to the corresponding food preservation time, and can also set the preservation time manually, so as to better reduce food waste caused by expired deterioration.

Degradable fresh-keeping film

With fresh-keeping film, people can not only ensure food hygiene, but also keep food fresh in a short time. However, the PE material fresh-keeping film on the market has good fresh-keeping ability, but it is difficult to degrade. With the global attention to "white pollution", degradable fresh-keeping film came into being in this situation.

It is reported that the preparation of cellulose nanofibers with different surface groups and their biodegradable composites