Modified atmosphere packaging, abbreviated as MAP, can be defined as "a technology for regulating the gas environment of foods in materials that can prevent gas in and out." The origin of modified atmosphere packaging dates back to the 1930s. In the past 30 years, the use of MAP technology has been continuously expanding, including raw and cooked meat products, fish, poultry, shellfish, fruits, sauces, crisps, coffee, tea, vegetables, and bread. The core of MAP is to regulate the gas around the fruits and vegetables to contain low oxygen and high carbon dioxide gas compared with the normal atmosphere. Proper temperature conditions are used to extend the shelf life of fresh products. The MAP technology regulates oxygen, nitrogen and carbon dioxide. . Although MAP can extend the shelf life of fresh fruits and vegetables, the loss of quality is inevitable. After our research in the past two years, fresh foods can be stored in modified atmosphere for a period of 4 to 14 days, which basically reaches the preservation period of modified atmosphere packaging of similar foreign instruments, enabling fresh foods to enter the shelf sales, and can improve some specialty products. The value of solving the problem that it is difficult to keep vegetables fresh in the vegetable basket engineering supermarket shows that the modified atmosphere packaging has a broad and application prospect.
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