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In our lives, as well as in shopping malls and supermarkets, many users are using plastic ziplock bags to preserve fruits and vegetables. So, how does the plastic ziplock bag play a role in keeping fresh? What problems do we need to pay attention to when using them? The preservation effect of the plastic ziplock bag is described in detail below.
In fact, the main reason for the plastic ziplock bag to play a fresh-keeping role is that vegetables and fruits are organic foods, containing water-soluble nutrients and enzymes. There is still a strong breathing activity during storage. Under aerobic conditions, sugars or other organic substances in fruits and vegetables are oxidatively decomposed to produce carbon dioxide and water, and a large amount of ripening is released. However, under the condition of lack of nutrients, the sugars cannot be oxidized and can only be decomposed to produce alcohol. Carbon dioxide and emit a small amount of heat. If you want to store the fruits and vegetables in a plastic bag, open the mouth of the plastic bag every two or three days, release carbon dioxide and heat, and then tie the mouth, which will reduce the occurrence of decay and deterioration.
However, it should be noted that in the above method, the carbon dioxide concentration cannot be increased indefinitely, and can only be increased by 10%. The drop in oxygen concentration should not exceed 5%. Because the alcohol produced by hypoxic respiration remains in the fruit sparse, it will cause fruit rot and deterioration, so the storage time of fruits and vegetables in plastic bags should not be too long.
