æ–‡ | Slow Discipline Hardcore said
edit | Slow Discipline Hardcore said
The coating of non-stick pans is toxic and can cause cancer . It will melt into the dishes after heating and be absorbed by the human body . Is this true? ?
CCTV reporter solved this mystery for us. After jointly conducting a series of targeted experiments with professional researchers from Beijing University of Chemical Technology .
came to the conclusion: It turns out that the coating of non-stick pans is poisonous , but this poison has a different meaning .
01 Is non-stick pan coating really toxic?
Various materials on the Internet about non-stick pan coating : polytetrafluoroethylene knowledge about the harmfulness of it is emerging one after another.
Nowadays, non-stick pans have become a poison that everyone talks about .
What is the truth?
In the CCTV popular science program " Life Tips " , the program team teamed up with Beijing University of Chemical Technology to conduct an experiment focusing on the melting point of the coating for non-stick pans and whether the coating is harmful .
In the laboratory, the researcher scraped off part of the coating from the purchased non-stick pan and put it into the equipment for heating.
The final screen shows that when the temperature of reaches 300℃, the polytetrafluoroethylene material will begin to decompose and melt.
As the temperature of gradually increases, the harmful substances produced by will also change.
The most harmful to the human body is when the coating is completely dissolved .
That is to say, when the temperature can be stable below 300℃, it should not be a big problem for people to use non-stick pans for cooking .
Then the question comes, can the temperature of our daily cooking reach 300℃ or even higher?
In fact, the temperature used for cooking in every household is generally around more than 100 degrees , and can only reach a high temperature of 300°C in extreme cases.
However, this is just an inference. The specific test results of and will depend on it.
In order to find a final answer, the researchers continued to experiment on heated non-stick pans .
They found that when the heating time reaches a certain time, if the pot starts to smoke, the temperature will reach around 200℃. If you continue to heat it until the temperature reaches 300°C, the smoke from the pot will be very choking.
In other words, if we can maintain the normal heating state when cooking, it will not easily reach the melting point of polytetrafluoroethylene.
And this result of the researcher can also be regarded as a warning to .
If you use a non-stick pan when cooking, you should try your best to avoid heating the oil too high. Turn off the heat in time when you see smoke, to effectively prevent the coating from melting.
I believe that for the general public, it is generally rarely possible to burn the pot when cooking.
Except for those "fried kitchen" contestants , people who are good at cooking can control the oil temperature to avoid dry cooking for too long the temperature is too high, which is generally safe.
Of course, is the ideal state .
Not to mention that some seed players love the thrill of stir-frying over high heat. Even when ordinary people are cooking home-cooked dishes, from time to time someone will accidentally start smoking in the pot.
Is non-stick pan really safe in this case?
This has to mention the properties of the non-stick pan coating itself.
In fact, polytetrafluoroethylene is considered a material with relatively high stability for and .
The reason why it can be used as a coating for pots is that it is heat-resistant, cold-resistant, alkali-resistant and acid-resistant. This material has rare corrosion resistance in human cooking situations.
Even for some "chosen ones", 's kitchen utensils are not durable.
I accidentally scraped polytetrafluoroethylene into the rice and ate it while cooking. The final result was not very bad .
Polytetrafluoroethylene will not be absorbed or decomposed in the human body. It can be excreted with the body's metabolism, which is equivalent to turning around in the body.
As long as the temperature is not too high, novices should not try non-stick pans easily, then the coating is harmless.
Looking at it this way, there seems to be no problem with the coating of non-stick pans, but why are there many cases of toxic polytetrafluoroethylene on the market?
In fact, this is caused by the loss of some information on the Internet.
In the history of lawsuits over toxic non-stick pans, it is actually another substance - perfluorooctanoic acid - that is actually toxic to the human body.
02 The source of the "poison" of the coating
Perfluorooctanoic acid is an emulsifier . When non-stick pans just came out, a company in the United States used this emulsifier to make non-stick pan coatings.
But perfluorooctanoic acid was not a controlled material at that time.
Many people do not know that perfluorooctanoic acid is extremely toxic to the human body . As a result, this company was also not subject to relevant supervision and prohibition during production.
But soon, the dangers of perfluorooctanoic acid were revealed..
There are many villagers living near the company's factory, but the local villagers found that the livestock they raised were getting sick one after another: internal organs were swollen, teeth were black, and tumors were growing in the body. After investigation, the problem appeared in the local water quality.
The villagers observed that the stones in the water were white and very light , which did not match the normal stone color. This is very likely that the water was contaminated.
There is a factory next to it, and they believe that water pollution must be inseparable from the factory..
But as luck would have it, new evidence was discovered when the villagers and lawyer appealed for verification.
Many female employees on the factory production line mostly gave birth to babies with deformities after pregnancy, and many other employees also suffered from cancer .
The factory was directly inspected and tested, and finally perfluorooctanoic acid, a harmful substance, was discovered.
In the history of the development of coating materials for non-stick pans, and were actually the perfluorooctanoic acid in this case that actually had a toxic effect.
After this case came out, my country has included perfluorooctanoic acid in controlled materials , and it is completely prohibited from using it to help produce non-stick pan coatings.
The common polytetrafluoroethylene is not that harmful. Of course,
is not completely without problems. The temperature control of and mentioned above means that the use of non-stick pans needs to be restricted.
It requires to divide people and usage scenarios .
First, those who are particularly good at cooking with and those who are particularly unable to cook with are not suitable for choosing non-stick pans.
Non-stick pans cannot be stir-fried or stir-fried with a shovel because they need to be careful about the coating that protects them.
And those who can scald oil when cooking obviously cannot control the heat temperature well.
Non-stick pans are really difficult to survive in the hands of these two types of cooks.
In addition, tends to get distracted when cooking, and cannot easily use non-stick pans. The reason is the same as above.
Second, in the cooking scene, non-stick pans are mostly suitable for frying rather than frying .
The former only needs to be turned over at most, but the latter will be scratched back and forth by the shovel, and the coating can be easily scraped off .
After all, although the material is stable, the human body will suffer from diarrhea if it eats chemicalsthink about it.
In addition, if the coating of the non-stick pan peels off, the non-stick effect will be greatly weakened, and it is easy to accelerate the peeling off of the surrounding coating.
After analyzing it like this, do you find that non-stick pan seems too "pretentious" ?
Actually you guessed it right.
For most families, the various brands of non-stick pans on the market today are difficult to use for a long time.
Their lifespan when kept in good condition is only about half a year to a year .
Some people have to ask, if non-stick pans are so "squeamish" and useless, why can be produced?
In fact, if you look at the above case, it is not difficult to find that non-stick pans were originally that emerged abroad.
As we all know, the cooking methods of our country are very different from those of Western European and American countries..
is actually fried, boiled, baked and other methods commonly used abroad, but in China it is stir-fried over an open fire, and the fireworks are even bigger .
In contrast, the small tones of non-stick pans really cannot hold China’s eating habits .
was finally passed to . China is not accustomed to , and many people have difficulty maintaining non-stick pans.
So if you really want to choose non-stick pans, are other types okay?
03 Choice of non-stick and non-non-stick pans
In addition to the common non-stick pans on the market, there is also a ceramic non-stick pan.
Compared with polytetrafluoroethylene, the melting point of ceramic non-stick pan coating is higher at 400℃, the performance is stable, and is non-toxic to the human body.
Ceramic non-stick pans seem to be more secure for high-temperature cooking .
But in fact, is also a fancy .
Although the melting point is high, ceramic non-stick pans are more likely to break.
Today's ceramic coating technology is immature and is very easy to be scratched during use and is not durable.
Especially ceramic non-stick pans are often not resistant to open flames and will turn black after cooking once or twice.
From the practical perspective of and , ceramic non-stick pans are not even as good as polytetrafluoroethylene.
So are there any other options for our and ?
For example, there are fine iron pots, cast iron pots, titanium pots, etc. on the market.
However, friends who have read our iron pot article may feel panic. Can I buy iron pot?
In fact, for most kitchen utensils on the market, it is easier and more secure to tend to buy well-known brand iron pots.
As long as you don’t try to take advantage of , will generally not be a scam.
Pots made of other materials, such as stainless steel pots, also have various precautions .
For stainless steel pots , most are only suitable for cooking .
At the same time, stainless steel pots also come with metal coating . If is rubbed and scratched frequently like non-stick pans, or dry-heated, the coating will be damaged.
can be regarded as the "squeamishness" of and like non-stick pans.
Not only that, stainless steel pots also contain heavy metals such as chromium and nickel. If the food being blanched is acidic or contains alkaloids, it is easy to undergo chemical reactions and release heavy metal substances. Therefore, it is generally not recommended to use stainless steel to cook lemons, Chinese medicine and other substances.
And titanium pot is extremely stable, resistant to high temperatures and corrosion, and has minimal toxic effects on the human body.
But it also comes with many shortcomings, such as easy to paste, extremely poor thermal conductivity, and easy to deform.
In contrast, pots of different materials each have their own advantages and disadvantages.
Families that are not too troublesome can actually start with in a comprehensive way. Different pots are used in different situations.
Although non-stick pans are not durable, they can still be used in specific cooking situations They are both safe and convenient.
If you steam, boil, or fry all in one pot at home, or it is not recommended to buy a non-stick pan.
04 Summary
Non-stick pans have been criticized for their toxic effects on the human body , but everyone can treat this kind of thing rationally.
After CCTV clarified the toxicity of polytetrafluoroethylene, the rumors about non-stick pans were self-defeating.
People don’t need to worry too much when choosing a pot. Non-stick pans are not the legendary scourge. You can just buy a suitable pot according to your own needs.
