The main function of the food vacuum bag is to remove oxygen, which is beneficial to prevent food spoilage. The principle is also simple, because the food spoilage is mainly caused by the flow of microorganisms, and the survival of most microorganisms (such as mold and yeast) is needed. Oxygen, and vacuum packaging is the use of this principle, the oxygen in the packaging bag and food cells are removed, so that the microbes lose their living environment.
The experiment confirmed that when the oxygen concentration in the package is ≤1%, the growth and reproduction speed of the microorganisms drops sharply. When the oxygen concentration is ≤0.5%, most microorganisms will be stopped by the cockroaches.
In addition to the growth and reproduction of microorganisms in vacuum, another important function is to prevent food from oxidizing. Because oils and fats contain a large amount of unsaturated fatty acids, they are oxidized by oxygen to make food taste and deteriorate. In addition, oxidation also makes Loss of vitamins A and C, the unpleasant substances in food pigments are affected by oxygen, which makes the color darker. Therefore, oxygen scavenging can effectively prevent food from spoiling.
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