Why do leftovers be covered with plastic wrap when put in the fridge?

Wrapping food in plastic wrap and putting it in the refrigerator can keep the food hydrated, isolate the odor, keep it fresh for a longer time, and there are a lot of bacteria in the refrigerator to prevent bacteria from entering the food.

It is best to choose and use PE plastic wrap. If you use PVC plastic wrap, it is best not to use it directly for packaging meat, cooked food, and foods containing fat, and it is not advisable to heat it directly in the microwave.

1.Look at the color. The yellowish color of the whole roll is PVC, and the white is PE.

2.Hand rubbing. PE cling film is generally less viscous and easy to open after rubbing it by hand, while PVC cling film is more viscous and not easy to rub by hand.

The plastic wrap contains plasticizers, and there are two ways to distinguish the plastic wrap:

Burn it. After the PE plastic wrap is ignited with fire, it burns rapidly and will not be extinguished from the source; PVC plastic wrap is not easy to ignite, will be extinguished after leaving the source, and has a pungent odor.

It is recommended to cover leftovers with a layer of plastic wrap when they are placed in the refrigerator, and the main reasons are:

1. It can slow down the water volatilization rate of food, reduce contact with cold air, and then prolong the freshness time;

2. Isolate the odor in the food, avoid the smell with other foods, and keep the fresh air inside the refrigerator;

3. To a certain extent, plastic wrap can reduce the contact between food and bacteria in the refrigerator.

There are a few things you need to pay attention to when storing leftovers in the daily refrigerator:

1. Leftovers need to be cooled before putting them in the refrigerator. Because hot food enters the refrigerator, the food will deteriorate, and the freezing effect of the refrigerator will also be affected.

2. Meat dishes are prone to bacteria between 2-4 hours. Leftovers are placed in the refrigerator within two hours of cooking and served in a shallow container for easy cooling.

3. Do not store leftovers for more than 5 hours. If the food is stored for too long, the bacteria in the food will release chemical toxins that can not be heated against these toxins.

4. It is best not to store leafy vegetables overnight. Eating it overnight can also be harmful to the human body, so it is okay not to eat overnight dishes and dispose of them.

5. Do not put leftovers in aluminum products, because the ingredients in the rice will react with aluminum products, and it will be harmful to the human body after eating.

Need to use plastic wrap.

There was a lot of meat in the fridge, and so on raw things. If the leftovers are not covered with plastic wrap, then the bacteria in the refrigerator will go into the dishes, because the refrigerator is low, which is not conducive to the rapid reproduction of bacteria but will also multiply.

Although I feel that there is a string of smell in the dish, the bacteria have destroyed the nutrition of the food itself, so don't do this, eating it is not good for your health. So be sure to have plastic wrap when putting leftovers in the fridge.

How to keep leftovers fresh:

Divide in advance: Knowing that this meal cannot be eaten, it should be divided into different plates when it comes out of the pot, and one of them should be put in the refrigerator after it cools down slightly, so that the "base" of bacteria in the dish is very low, and there is no problem on the second or even third day, when it is hot enough to eat.

Put it in the innermost part of the lower level of the refrigerator:

If the dish has been out for two or three hours and has been actively turned with chopsticks, the expiration date.

will be shortened. At this time, pay attention to spread it out a little and put it in the innermost part of the lower level of the refrigerator, so that it can cool down to the temperature of the refrigerator as soon as possible. It's okay to put it on the second meal, but be sure to heat it thoroughly to 100 and keep it boiling for more than 3 minutes.

When putting leftovers in the fridge, cover them with plastic wrap for the following reasons:

1.Prevents oxidation: Many foods can cause oxidation reactions in the air, resulting in poor quality and bad taste. Using plastic wrap can prevent oxidation, slow down the process, and extend the shelf life of food.

2.Avoid odors: The taste of different foods can sometimes affect each other, and if you don't take care of them, these odors may penetrate into other foods, leading to a loss of quality. Wrap leftovers in plastic wrap to avoid cross-contamination of odors.

3.Prevent dehydration: After food is placed in the refrigerator, it may lose a lot of water, and the loss of moisture may cause the food to taste worse and harden the stool. Using plastic wrap seals in the moisture of the food, reducing loss and keeping it moist and delicious.

4.Easy storage: Wrap food in plastic wrap so you can place it separately and neatly, taking up less space for easy storage.

Therefore, wrapping leftovers in plastic wrap when putting them in the refrigerator can keep the food fresh and delicious while also preventing them from reacting with other foods, making it easy to store and manage. It should be noted that plastic wrap should be made of safe and hygienic materials to avoid harm to the human body, and it needs to be wrapped tightly to avoid air ingress.

Because:

Can prevent odors:The smell of various foods will pass on to each other, and if the food is not sealed with plastic wrap, it may affect each other, causing the food to produce peculiar smells, thereby reducing the taste and quality of the food.

Cross-contamination can be prevented:If plastic wrap is not used, leftovers can easily be contaminated with bacteria and microorganisms. These microorganisms can invade food and multiply, causing food to spoil and causing health problems.

Can prevent corruption:If the food that is simply stored in the refrigerator is not closed with plastic wrap, it is easy to be attacked by cold air, resulting in dry food surfaces, reducing the moisture content of the food, and thus accelerating spoilage.

The reason for putting leftovers in the refrigerator and covering them with plastic wrap is to protect the food from oxidation and spoilage.

When food is exposed to air, the moisture and nutrients in it are gradually lost and come into contact with oxygen, which leads to oxidation. Not only does this affect the texture and taste of high-profile foods, but it may also reduce their nutritional value.

Covering food with plastic wrap can reduce the time and degree of food contact with air, thereby extending the shelf life of food. In addition, plastic wrap can also prevent the invasion of odors and bacteria in the refrigerator, making food more hygienic and healthy.

It should be noted that the plastic wrap should completely cover the surface of the food and try to expel the air from the bag to achieve the best freshness. At the same time, before storing food, it should be cooled below room temperature to avoid condensation of hot air and water vapor in the package.

The main purpose of covering leftover Zen vegetables with plastic wrap when putting them in the refrigerator is to prevent the food from being exposed to the air, preventing the food from oxidizing, changing the quality of the food, and being affected by odors. Plastic wrap can effectively seal the surface of food, reduce air contact, prevent moisture loss and bacterial invasion, and thus prolong the freshness of food.

One is to prevent cross-flavoring, that is to say, there is only one place in the refrigerator, or two places, then all kinds of flavors are stringed back and forth, and after covering the plastic wrap of Wang Ridge, it prevents bacterial infection. That is to say, it can be that he keeps the original flavor and the appearance will not change, but no matter what it is, the color and taste will change over time.

Covering with plastic wrap can prevent food from smelling, reduce the contamination of food by bacteria in the refrigerator, and prolong the freshness of food.

1. Prevent the loss of water, and effectively save the water in the food at a certain level.

2. Prevent food from smelling and play a certain role in the isolation of liquid residue.

3. To a certain extent, it can effectively prevent the invasion of bacteria.

Leftovers need to be put in plastic wrap in the refrigerator. Plastic wrap can slow down the evaporation rate of water in food, reduce contact with cold air, and thus prolong the freshness time. It can also isolate the emission of food odors, avoid odors with other foods, and maintain fresh air inside the refrigerator.

To a certain extent, plastic wrap can also reduce the contact of food with bacteria in the refrigerator.

Plastic wrap: It is a kind of plastic packaging products, usually made of ethylene as the masterbatch through polymerization reaction, plastic wrap can be divided into three categories: the first is polyethylene, referred to as PE; the second is polyvinyl chloride, referred to as PVC; The third is polyvinylidene chloride, or PVDC for short.

Microwave oven food heating, refrigerator food preservation, fresh and cooked food packaging, etc., are widely used in family life, supermarkets, hotels and restaurants and industrial food packaging fields.