SN/T 5232-2019Food Contact Materials Testing of Modified Atmosphere Packaging for Fresh Cut Products (English PDF)

2.1 Modified atmosphere packaging/(MAP)

By changing the atmosphere inside the package, the food is placed in an atmosphere that is different from the air component (78.8% N2, 20.96% O2, 0.03% CO2) the packaging with extended shelf life is referred to as MAP.

4.1 Carbon dioxide (CO2)

Carbon dioxide (CO2) has the effect of inhibiting the growth and reproduction of most spoilage bacteria and molds, and can extend the incubation period of bacterial growth (Or stagnation period), it is the main antibacterial agent in the fresh-keeping gas;

4.2 Oxygen (O2)

O2 can inhibit the growth and reproduction of most anaerobic spoilage bacteria, maintain the color of fresh meat, and maintain the freshness of fresh fruits and vegetables the role of respiratory metabolism.

4.3 Nitrogen (N2)

Nitrogen is stable in nature. The use of nitrogen is generally to eliminate oxygen, thereby slowing down the oxidation and respiration of food. Nitrogen it also has a certain inhibitory effect on the growth of bacteria. In addition, nitrogen is basically insoluble in water and oil, and food has little adsorption effect on nitrogen.

SN/T 5323-2019

It will not shrink gradually due to the absorption of gas during installation.

4.4 Argon (Ar)

Argon is the same colorless and odorless inert gas as nitrogen, but the mass of argon is heavier than nitrogen and its solubility is twice that of nitrogen. It can replace nitrogen as a mixture Gas filling gas. It is generally believed that argon and nitrogen have no inhibitory effect on microorganisms, but recent experimental studies have shown that argon has obvious antibacterial effects.

Use, because microorganisms are sensitive to Ar and change the membrane flow characteristics of microbial cells to affect their functions. In addition, argon atoms are similar in size Oxygen, density is greater than oxygen, and solubility is higher, so argon can displace oxygen from the oxygen receiver of plant cells and enzymes, thereby inhibiting the oxidation reaction and slow down the metabolic rate of breathing.

4.5 Sulfur Dioxide (SO2)

SO2 non-binding non-ionic molecules have an antibacterial effect, which can inhibit the reproduction of soft fruit molds and bacteria (especially grapes and dried grapes).

Fruit), it can also inhibit the bacteria in fruit juice, liquor, shrimp and kimchi. The inhibitory effect of SO2 on different microorganisms is related to the concentration. SO2 suppression Gram-negative bacteria such as Escherichia coli and Garmonas are more effective than Gram-positive bacteria such as lactobacillus.

5.1 Composition

The mixed gas of the modified atmosphere packaging is composed of two or three kinds of gases among the three gases of CO2, O2, and N2.The volume of each gas the percentage is called the gas mixture ratio, which is generally 78.8% N2, 20.96% O2, and 0.03% CO2.

5.2 Proportion

The ratio of mixed gas for modified atmosphere packaging should be selected according to the type of food and preservation requirements. Table 1 is several kinds of foreign food modified atmosphere packages the mixed gas composition and the gas mixing ratio. Table 2 shows the mixed gas composition and storage period of several domestic food modified atmosphere packaging.

6.2 Inhibition of pathogenic bacteria

High-concentration CO2 is effective in inhibiting Staphylococcus aureus, Salmonella, Escherichia coli, Yarrowia intestinal bacteria, and the inhibitory effect varies with the temperature rises and decreases.

7.1 Large packaging

Large packaging is mainly used for pallet packaging and cardboard box packaging during transportation and storage. These materials are relatively environmentally friendly and can be recycled.

Collect and use.

7.2 Pre-packing

Pre-packaging is mainly used in the sales link of products, and the retailer or the customer themselves use the modified atmosphere pre-packaging for packaging. Pre-packaged pass Commonly used film materials include low-density polyethylene (LDPE), polyvinyl chloride (PVC), polypropylene (PP), these films can help prevent the loss of moisture ensures the quality of the product.