keep beef fresh--Modified atmosphere packaging machine
Modified atmosphere packaging machine: The main function of carbon dioxide in modified atmosphere packaging is bacteriostasis, which is divided into the following aspects.
First, in the packaging bag of high concentration carbon dioxide, carbon dioxide replaces oxygen. The high carbon dioxide environment makes a large number of aerobic microorganisms (such as Pseudomonas) Growth is inhibited;
Second, because carbon dioxide can dissolve in water to form carbonic acid, lower the pH value, and make certain acid-resistant microorganisms lose the necessary conditions for survival;
Third, through the penetration of cells. At the same temperature and pressure, the solubility of carbon dioxide in water is 6 times that of oxygen, and the rate of penetration into cells is 30 times that of oxygen. Due to the large amount of carbon dioxide infiltration, it will affect the structure of the cell membrane, increase the permeability of the membrane to ions, and change the inside and outside of the membrane. The balance of metabolism, which interferes with the normal metabolism of cells, inhibits bacterial production. Carbon dioxide infiltration also stimulates mitochondrial ATPase activity, accelerates oxidative phosphorylation, reduces ATP, and reduces the energy required for metabolic growth.
