The new development of cold storage technology is mainly manifested in cold storage construction, loading and unloading equipment and automatic cold storage. Computer technology has been applied to automatic cold storage, and now it is also used in developed countries such as Japan and Italy.
1, modified atmosphere storage method
Mainly use modified atmosphere storage bags and horse modified atmosphere storage to enter the showcase for storage and preservation, and adjust the storage environment.
Gas composition, so that the concentration of carbon dioxide in the storage environment reaches the concentration suitable for storage, so there are
Effectively inhibit the growth of bacteria, reduce the loss and decay of fruit water, delay aging and prolong life.
The purpose of storage period.
2, decompression storage method
At present, partial air extraction by vacuum, decompression storage and low temperature and low pressure storage are the storage methods of grapes and other fruits.
The development direction of. This method is to store grapes in a closed room. Reduce the internal air pressure to
After reaching a certain level, fresh air passes through the voltage regulator and humidifier of the refrigerator from time to time and becomes close.
Humidity-saturated air enters the storage room, thus eliminating B produced by field heat, respiratory heat and metabolism.
Unfavorable factors such as olefin, carbon dioxide, ethanol and acetaldehyde. , so that the stored goods are temporarily in the best dormant state.
State. This technology was studied earlier in advanced countries such as Britain and the United States, and it was also introduced in China and Baotou City, Inner Mongolia.
Application technology of industrialized decompression and fresh-keeping storage system and device. This storage method will reduce grapes.
Respiratory intensity and ethylene production rate prevented the senescence of grapes and reduced physiological diseases. Don't lose
It is an ideal fresh-keeping storage technology for grapes.
3. Preservation technology of natural preservatives
Such as dry distillation of tree trunks and plant seed extracts, used for the preservation of fruits and vegetables. sweet
Plant extracts, minerals, natural products containing reductase, oryzanol, melanin, polysaccharide (
Konjac polysaccharide and natural antioxidants can be used for soaking and spray storage of grapes.
Experiments show that these natural preservatives can reduce the water loss and mildew of grapes.
Change, maintain high nutritional content and so on.
4, coating storage and preservation method
It has many functions, such as helping digestion, losing weight, lowering cholesterol and preventing cancer. Anticorrosion technology of coatings has been developed in recent years.
The rise of new technology. Polysaccharide is an all-natural edible substance. At present, it is widely used.
In the food, pharmaceutical and chemical industries. Wrapping grapes with polysaccharide can form a layer and a half on the outside of grapes.
The breathable film and fertilizer can effectively reduce the respiration of fruits and reduce the sweating of grape cold storage equipment during storage.
Phenomenon and water drops on the surface of fruit, thus reducing the infection of pathogenic bacteria, inhibiting fungi and enhancing themselves.
Resistance basically prevented browning, maintained the original flavor of grapes and greatly improved the edibility.
So as to prolong the normal temperature fresh-keeping period of grapes from 2-3 days to 8 days. Because this method is simple, easy to learn and beneficial.
The interest rate is low, which solves the problem of toxic substance residue in chemical preservation method.
It has been well applied.
This storage method is not limited by environmental conditions, and refrigeration is the main method of modern grape storage and preservation.
Type. It can be used all over the country. Mechanical refrigeration is the main method of this kind of storage, which mainly
If the mechanical refrigeration system is used to transfer the heat in the warehouse to the outside, the temperature in the warehouse will be reduced.