How Long Can Vacuum-packed Rice Cakes Last?

Vacuum packed rice cakes can last for 45 days. The main function of vacuum packaging is to remove oxygen in order to help prevent food deterioration. Its principle is relatively simple, because the mildew and deterioration of food is mainly caused by the activities of microorganisms. The survival of most microorganisms (such as molds and yeasts) needs oxygen, and vacuum packaging uses this principle to pump oxygen out of the packaging bags and food cells, so that the microorganisms lose their "living environment". Experiments show that when the oxygen concentration in the packaging bags is less than or equal to 1%, the microorganisms grow and multiply. When it falls to 0.5%, most microorganisms will be inhibited and stop reproduction. (Note: Vacuum packaging can not inhibit food deterioration and discoloration caused by anaerobic bacteria and enzyme reaction, so it needs to be combined with other auxiliary methods, such as refrigeration, quick freezing, dehydration, high temperature sterilization, irradiation sterilization, microwave sterilization, salt pickling, etc. )

In addition to inhibiting the growth and reproduction of microorganisms, vacuum deoxidization is another important function to prevent food oxidation. As oil and fat foods contain a large number of unsaturated fatty acids, which are oxidized, it makes food turn sour and deteriorate. In addition, oxidation also causes the loss of vitamins A and C, and unstable substances in food pigments are darkened by oxygen. Therefore, deoxidization can effectively prevent food from deteriorating and keep its color, aroma, taste and nutritional value.