The use of plastic wrap like this is more beneficial to health and health

Source: China Consumer News

Fresh fruit, vegetables, meat, and fish can't be eaten for a while, and they are not willing to throw them. Many people are used to pulling off a cling film to prevent the flavor from "keeping fresh".

However, what are the differences in the plastic wrap that "look like" in the market? How to use plastic wrap to keep fresh? Is it true that the "preservation of plastic wrap to breed bacteria" and "plastic wrap may cause cancer" on the Internet. Is it true? Researcher Zhong Kai, director of the Food and Health Information Exchange Center in this issue of food safety consumption prompts, revealed the secrets for everyone.

Buy: different functions of different functions

Not only can the dust in food and air, especially the microorganisms of "gourmet food" to maximize separation, but also maintain moderate oxygenity and humidity, thereby extending the food preservation period of food. The "scientific truth" of plastic wrap foods and preservation foods is actually that simple.

The plastic wrap has different functions due to different materials. In an interview with the China Consumer Daily, Zhong Kai said that the preservation film sold on the market can be divided into three major three major in polyethylene (PE), polyvinyl chloride (PVC), and polytathene (PVDC). kind.

PE (polyethylene) plastic wrap. Most of the plastic wraps sold in supermarkets are like this. It has good waterproof and breathable, especially suitable for packaging fresh fruits and vegetables, frozen foods, etc. However, it is precisely because of its good breathability that it is not suitable for packaging foods such as cakes and cooked foods that are easy to destroy the flavor of oxygen. PE can be used for freshness in the refrigerator, but cannot be used for microwave heating.

PVC (polyvinyl chloride) plastic wrap. Common market for wholesale markets, farmers' markets and online. The advantages are good transparency, high viscosity, and good elasticity. The disadvantage is that the heat stability is poor. At high temperatures, it will release a plasticizer that is not friendly to human health. Therefore, it is not possible to pack meat, cooked food, oil foods, etc., especially at high temperature conditions. At present, this plastic wrap is mainly used to pack vegetables and some agricultural products at room temperature.

PVDC (polytaphylinthylene) plastic wrap. It has the characteristics of good freshness, strong and easy to stick, and can prevent water evaporation. It is mainly used for packaging and preservation of foods such as meat, cooked food, ham and other foods. The most important thing is that because its use temperature range is between -60-140 ° C, it can be used for freshness and microwave heating. However, the cost of preservation film is high, the processing is difficult, and the market share is not high.

Explanation: Compliance products ensure safety

"Plastic membrane will not only accelerate bacterial reproduction, but also is more likely to cause cancer." This statement has always been the main reason why many people alienate plastic wrap.

Zhong Kai analyzed and explained that as a product that can be directly contacted with food, the safety of qualified plastic wrap is not required.

First of all, the role of plastic wrap is to suppress rather than release or breed microorganisms such as bacteria. Most of the microorganisms such as bacteria in food come from the food itself. As a result, the foods that cover the plastic wrap instead of bacteria and faster corruption are nothing more than three types: first, food has been invaded by microorganisms before covering plastic wrap; second, the preservation environment is not clean or the temperature is too high; The preservation or improper use of the plastic wrap itself, such as the storage of more dust, reuse, poor hand hygiene.

For example, Zhong Kai said that the overnight watermelon that covered the plastic waters caused severe gastrointestinal discomfort, which seemed to be an empirical evidence of "plastic wrap accelerated bacterial reproduction", but in fact, using clean chopping boards and knife -cut watermelons, clean fresh preservation in time with fresh preservation After the membrane is covered, the classification is stored in a clean and orderly refrigerator, which cannot cause bacteria to grow rapidly. If there is a problem, it must be that the watermelon is contaminated from the process of opening to storage.

The most controversial and most easily caused by plastic wrap is the problem of plasticizers (also known as plasticizers) in the PVC material. The reason for the use of plasticizers is because the softness of plastic wrap is needed, but some studies have said that the human body has a long -term contact with plasticizer, which may have anesthesia, teratogenic and even hidden dangers of carcinogenic.

Zhong Kai analyzed that the World Health Organization listed the "phthalate" substances in plasticizers as 2B carcinogens, and 2B carcinogens were proven to have carcinogenic effects on animals, but the carcinogenic effect on people did not clear. The World Health Organization believes that a 60 kg -weighed adult consumes no more than 1.5 mg of "phthalate" substances per day, which is safe.

Nevertheless, my country's "Food Safety Standard Food Materials and Products Use Adding Preparation Standards" (GB9685-2016) and other national standards and related regulations of the use of plasticizers and the total amount of plastic wrap (including "phthara acid acid Escin "and other strict limits for the quality of the ester" such as "ester" and other food contacts. In other words, as long as it is a plastic wrap that meets relevant national standards, it will not cause harm to health.

Use: The method should be proper to worry -free

Some research tests show that under certain special environmental conditions, some plastic wraps do have the possibility of increasing chemical migration, which means that only the correct method of use can avoid the possible safety hazards that may bring.

In life, some people are used to covering the container with plastic wrap, and even use the plastic wrap to wrap the food directly. Zhong Kai believes that it is best to use glass, ceramics or microwave oven containers for heating foods. If you really need to cover the container with plastic wrap, you should pay special attention to the following points:

First of all, no plastic wrapped in microwave oven is not indicated, and it must not be used in microwave oven. At the same time, the maximum heat -resistant temperature marked by high temperature -resistant plastic widening of different brands is different. Try to choose a plastic wrap with high heat resistance as much as possible, and the use time should not be too long. Second, keep a certain distance from food. In fact, regardless of whether it is used for heating, it is recommended to use the deeper container to use the plastic wrap, that is, at least two centimeters from the plastic wrap from the food, let the plastic wrap only contact the container without contacting the food itself. Especially for foods with large oily properties, the plastic wrap can be damaged after heating and adhesion with food.

Third, take a few small holes with a toothpick. Before heating, you can use a toothpick and other small holes on the plastic wrap, which is conducive to the evaporation of water vapor. Otherwise, it is easy to cause plastic wrap blasting due to gas expansion and even cause danger.

In addition, the hot dishes just cooked should not cover the plastic wrap, because when the vegetables are hot, it is covered with plastic wrap, which not only cannot maintain vitamin C in the vegetables, but increases its loss. You can choose heat -resistant glass, porcelain plates, etc. instead of plastic wrap to cover food.

No matter what kind of materials, it is not advisable to contact alcoholic foods, and it is not advisable to wrap foods such as cooked food and meat with greater oily food for a long time. Wrap fresh fruits and vegetables with plastic wrap. PVDC plastic wrap can provide longer fresh -keeping time because it has better moisturizing. However, it is still recommended to take no more than 12 hours. After all, the role of plastic wrap is short -term preservation, not long -term storage.

The bags that are bought back from the supermarket are fruits and vegetables with plastic wrap. If it is kept in fruits and vegetables with refrigerated or frozen, it is the most secure way to use clean paper towels and preservation of plastic wrap again in the outer layer.

In the end, it is important to emphasize that not all vegetables and fruits can be kept in plastic wrap. Some research tests show that apple, pear, rapeseed, leeks, lettuce and other fruits and vegetables with large water preservation are kept fresh, which can not only keep fresh for a long time, but also increase nutrients such as vitamin C. The fresh -keeping of radishes and bean horns is kept fresh, but nutritional losses are very large.

Buy a little trick

Zhong Kai reminded consumers to go to the regular business to buy plastic wrap. At the same time, pay attention to four o'clock.

Look at the material. When buying, pay attention to the material marked on the packaging, and buy applicable plastic wrap as required. At the same time, the material can be assisted according to the color and whether it is easy to rub. Generally speaking, the plastic wrap film that is not easy to open on the surface is made of PVC. The plastic wrap film of PE material is white. Generally speaking, the family uses plastic wrap, it is recommended to choose PE material.

Look at the appearance. Choose a plastic wrap that is intact, flat on the surface, no bubbles, no perforation, no rupture, no impurities, and no foreign objects to facilitate use. At the same time, pay attention to the date of production and shelf life. The packaging bag is damaged or exceeded during the shelf life, and there may be bacteria and mold breeding.

Sniffing the smell. The qualified plastic wrap does not have any odor. The flavorful plastic wrap will not only have a skewed taste, but also affect food safety. It should be avoided in purchase and use.

Check the identification. Pay attention to whether there are QS logo and production license number on the product packaging.

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