Controlled atmosphere library

Controlled atmosphere storage is developed on the basis of fruit and vegetable cold storage. It is based on refrigeration and increases the adjustment of gas components. Through the control of temperature, humidity, carbon dioxide, oxygen concentration and ethylene concentration in the storage environment, it can inhibit fruits and vegetables. Respiration, on the one hand, has many similarities with fruit and vegetable cold storage, and on the other hand is quite different from fruit and vegetable cold storage.

The advantages of modified atmosphere preservation over ordinary refrigerated preservation are mainly manifested in the following aspects.

1. Long storage time

Under the same fresh-keeping quality and temperature conditions, the fresh-keeping time of air-conditioned storage is 3 to 5 times that of ordinary fresh-keeping cold storage, and even dozens of times for some foods.

2. Good storage quality

The main characterization of the fruit and vegetable storage and preservation effect is whether the original quality of the fresh fruit and vegetable can be well maintained, that is, whether the original shape, hardness, texture, color, flavor, nutrition, etc. can be well preserved or improved. Because of the strong inhibition of the aging process of fruits and vegetables after harvesting, the above-mentioned indicators can be well preserved in controlled atmosphere storage. After long-term storage in controlled atmosphere (such as 6-8 months), many fruits still have bright colors, green stalks, The flavor is pure and the appearance is full, almost the same as when it was first harvested. Modified atmosphere storage can keep fruits and vegetables firm and prevent them from softening. This is because it inhibits the activity of pectinase and inhibits the degradation of pectin.

Modified atmosphere storage can keep the original fruit color well. Green peppers start to turn red after being refrigerated for more than ten days, but the redness can be significantly inhibited when stored in modified atmosphere. The reddening phenomenon of winter jujube after harvest is very obvious, but it can be obviously suppressed by using modified atmosphere.

Modified atmosphere storage can significantly reduce the respiration intensity, reduce the consumption of sugar, organic acids and other flavor substances, and maintain the flavor of fruits and vegetables.

3. Storage loss is reduced

Controlled atmosphere storage effectively inhibits the respiration, transpiration and microbial damage of fruits and vegetables, thus significantly reducing the loss during storage.

4. Inhibit mold growth and germination

Modified atmosphere storage can significantly inhibit mold growth and reduce rot. Controlled atmosphere storage is also ideal for inhibiting germination of fruits and vegetables. Modified atmosphere storage can also inhibit the browning of fruits and vegetables.

5. Significantly inhibit the production of ethylene

Some fruits and vegetables, such as kiwi fruit and peach, produce a large amount of ethylene and are very sensitive to ethylene. The use of modified atmosphere storage can significantly inhibit the production of ethylene and prolong its storage period.

6. Extended shelf life

Shelf life refers to the time that fruits and vegetables are placed on store shelves after they have finished storage. It is a very important indicator for operators. For merchants, a commodity without a sufficient shelf life is a very dangerous commodity, and it is also a commodity that is extremely difficult to manage. As we all know, due to the long-term effects of low oxygen and high carbon dioxide in controlled atmosphere storage, fruits and vegetables still have a "hysteresis effect" for a long time after the controlled atmosphere state is released, which provides a theoretical basis for extending the shelf life. Tests have shown that under the premise of maintaining the same quality, the shelf life of modified atmosphere storage is 2-3 times that of refrigeration.

7. Conducive to the development of pollution-free green food

In the process of controlled atmosphere storage of fruits and vegetables, they can be treated without any chemicals. The measures used are all physical factors. The factors such as oxygen, nitrogen, carbon dioxide, moisture and low temperature that fruits and vegetables can come into contact with are indispensable in people's daily life Therefore, it will not cause any form of pollution and fully meet the green food standards.

8. Conducive to long-distance transportation and export

The quality of fresh fruits and vegetables treated with modified atmosphere technology is obviously improved after storage, which creates conditions for export and export.

9. Has good social and economic benefits

Because of the advantages of long storage time and good storage effect, controlled atmosphere storage can make a variety of fruits and vegetables almost reach seasonal production, annual sales and annual supply. "Contradiction, which not only meets the needs of consumers, provides people with a source of high-quality nutrition for a long time, but also improves the production and operation of fruit, giving producers and operators huge economic returns.

10. High safety and reliability

In terms of construction, the air-conditioning warehouse has higher air tightness requirements than the ordinary fresh-keeping warehouse, which is also one of the most important features of the building structure of the air-conditioning warehouse that is different from the ordinary fruit and vegetable cold storage. Ordinary cold storage has almost no special requirements for air tightness, while air-conditioned storage is very important for air tightness.

This is because in order to form the required gas components in the controlled atmosphere storage, maintain the set index for a long time during the storage of fruits and vegetables, and reduce the gas infiltration and exchange of the gas inside and outside the storage, the controlled atmosphere storage must have good air tightness .

To this end, Lv Weicheng, an expert in air-conditioning preservation technology, reminds everyone that during the installation of air-conditioned warehouse doors and the construction of airtight layers, we must be careful and meticulous, and suspicious parts should be inspected and repaired in time. In addition, before the airtight construction of the library body, it must be noted that the library board must be dry.