Recently, a copy of "Salt plus potassium ferrocyanide" signed "Professor Yu of the Central Party School" was published on WeChat Moment, circulated on many social exchange network platforms, and was certified as a rumor. The rumors of the health hazards of adding potassium ferrocyanide to 1-hour table salt have attracted widespread attention. So, what exactly is potassium ferrocyanide? Why add to table salt? Is table salt with potassium ferrocyanide added to the human body not harmful? How should guests choose salt scientifically? Look at the reporter's in-depth investigation.
Why add potassium ferrocyanide.
"A few days ago, the circle of friends added potassium ferrocyanide to table salt and forwarded copies of harmful health. After reading it, I immediately found the salt bag at home and checked the raw material table. I found that the salt in the lake I ate at home did not contain potassium ferrocyanide, so I was relieved. ”。 Aunt Liu, who lives in Beijing's Xicheng District, confessed that she didn't pay attention to the salt ration table because she didn't look skilled either.
Like Mr. Liu, there are many guests with less knowledge of salt. Why is potassium ferrocyanide added to table salt?
"Potassium ferrocyanide is a common anti-caking agent. ”。 Zhong Kai, deputy director of the Kexin Food and Nutrition News Exchange Center, said that before the emergence of refined salt, the salt that people ate was large grain salt, which had good salt fluidity and was not easy to solidify. After that, with the improvement of people's living standards, the food is more and more refined, in addition to refined rice, refined white, refined oil, even table salt has become refined salt, large grain salt is only used in pickles. However, it is easy to absorb the moisture in the gas after opening the refined salt, which is easy to solidify due to moisture, and sometimes it cannot be held by hand, which is not conducive to daily adoption. "Now you can hardly see the salt blocks. Because the anti-binder potassium ferrocyanide was added to the salt. ”。 Zhong Kai said.
Potassium ferrocyanide, commonly known as potassium yellow blood salt, yellow blood salt is a pale yellow crystalline particle, the primary role is to add to the table salt as an anti-caking agent, to prevent salt from clumping. According to the "National Standard for Food Safety" (gb2760-) issued by the former National Health and Family Planning Commission, in addition to potassium ferrocyanide, sodium ferrocyanide, ferric ammonium citrate, silicon dioxide, and calcium silicate can also be added to salt products.
Attentive customers have also found that the most used anti-caking agent on the market is potassium ferrocyanide. Zhong Kai explained that according to the requirements of China's national standard (gb/t 5461-), the insoluble impurities in table salt should not exceed 0.2%, in order to achieve the desired resistance effect, the amount of silica or calcium silicate must be added to at least 0.3%
In addition, iron ammonium citrate is used as an iron enhancer, but its resistance is not as good as potassium ferrocyanide, only 5 mg of potassium ferrocyanide is added per kilogram of salt, in order to get the same effect, from 20 mg to 25 mg In addition, the table salt with iron ammonium citrate is pale yellow, and the whiter the salt, the more easily it is accepted. From the price point of view, the price of ferric ammonium citrate is almost twice that of potassium ferrocyanide. "Cheap, sufficient and effective resistance are the reasons why potassium ferrocyanide stands out." ”。 Zhong Kai said.
Is potassium ferricyanide detrimental to health?
Food safety is a constant concern for guests, and table salt is no exception. As soon as many people see the word "potassium cyanide", they put their observational power on "potassium cyanide". "Potassium ferrocyanide and highly toxic potassium cyanide are two substances," said Zhu Yi, an associate professor at the College of Food Science and Nutritional Engineering at China Agricultural University, adding that potassium ferrocyanide is chemically stable and usually does not release toxic cyanide.
"Theoretically potassium ferrocyanide decomposes at high temperatures to produce potassium cyanide, which is at least 400, and the temperature of usually home-cooked dishes is not very high. ”。 Zhong Kai said that the equipment of the chemical laboratory to reach a 400 ° C environment is called a high temperature box. Usually, the temperature of household cooking, the smoke point of cooking oil is basically below 230 ° C, the smoke point of peanut oil is 160 ° C, and when it reaches 330 ° C, the coating of the non-stick pan begins to melt. "Potassium ferrocyanide in table salt is to be truly decomposed at high temperatures to reach the amount of poisoning each adult, basically without repeating dozens of kilograms of salt at a time, which is impossible." Zhong Kai said.
Regarding the absence of potassium ferrocyanide in overseas products, the field survey results conducted by CCTV last year showed that whether it is imported table salt sold in China, or foreign enterprise brand salt sold in overseas supermarkets and foreign shopping websites, potassium ferricyanide and ferricyanide
"Not using" and "not using" are two different things, allowing networks to enter foreign countries to use Potassium Felicianide, but not actually using it is a lie. ”。 For example, About 95% of the salt produced by Zhongyan Jintan Chlorination Co., Ltd. is supplied to overseas markets, and the salt exported to 26 countries is fortified with potassium ferrocyanide, including the US and European markets. However, the salt exported to Japan does not contain potassium ferrocyanide, the first reason is not that potassium ferrocyanide is toxic and harmful, nor because the Japanese government does not allow it to be added, but because Japan is an island country, which has historically dominated sea salt and large sea salt particles.
Regarding the safety of potassium ferrocyanide, Wang Huali, an associate researcher at the Standards Third Room of the National Food Safety Risk Determination Center, believes that China's "National Standard for Food Safety Food Additives Adoption Standard" (Data from the World Health Organization and the Food and Agriculture Organization of the United Nations) show that the lifetime safe amount of potassium ferrocyanide is 0.025 mg per kilogram of body weight. That said, for a 60-kilogram person, there is no problem at all with 1.5 mg of potassium ferrocyanide a day.
Zhang Guangcheng, a registered nutrition technician in China and a national first-class public nutritionist, believes that table salt with potassium ferrocyanide does have side effects, affecting the mineral absorption of eaters. In addition, potassium ferrocyanide can also decompose in an acidic environment, and some customers may experience allergy symptoms. "In addition, must salt add anti-caking agents?" This is debatable. In fact, salts that do not contain anti-caking agents rarely solidify and are crushed by hand. The addition of anti-caking agents does not have a great impact on customers in terms of price. ”。 Zhang Guangcheng said that in order to avoid risks, pregnant women, children, the elderly, convalescent patients, people with sensitive constitutions and others are advised not to eat table salt containing potassium ferrocyanide.
What should I do if there are many categories?
In daily life, stir-fry, cooking, and salt are indispensable seasonings. With the rapid development of salt making technology and the improvement of people's living standards, there are more and more types of salt on the market. From basic refined salt to rock salt, lake salt, sea salt, and then to personalized cold mix salt, goji berry salt, shiitake salt, iodine-free, iodine, low sodium and other special salts, customers can choose a large gap between the air.
According to the relevant doctors of the Nutrition Department of the China-Japan Friendship Hospital, which "varies according to the application of salt", in the 1995s, the head disease was especially caused by insufficient iodine, insufficient materials, and inland areas rarely ate seafood containing iodine, so China began to add iodine to salt in the country from 1995, but with the rapid development of the economy and society, thyroid diseases occur frequently, and patients will worsen their condition by eating iodized salt again. For example, patients with hyperthyroidism must be banned from iodine. As a result, iodized salt is shipped again.
How should normal people choose iodized salt? According to industry experts, people with normal thyroid function who eat iodized salt for a long time do not have to worry about hyperiodiodo goiter, thyroid nodules and other diseases. The iodine content of iodized table salt currently on the market ranges from 18 mg/kg to 33 mg/kg, and based on per capita salt intake, the amount of iodine that residents consume from iodized salt per day is about 180 μg to 330 μg, high iodine
In fact, there are many rumors about salt. For example, "Low sodium salt is the salt that kills". The main components of table salt are sodium chloride, chloride ions and sodium ions in the human body and potassium ions and other elements are interrelated, its main role is to control the cell, tissue fluid and blood electrolyte balance, control the normal circulation of body fluids and acid-base balance in the body Zhang Guangcheng believes that low sodium salts contain potassium, some potassium instead of sodium. Patients with kidney disease get hyperkalemia because of high potassium, which is because the amount of low sodium salt must be controlled to restore the electrolyte balance in the patient's body.
Is it okay not to eat sodium salt? The human body also pays attention to the intake of sodium, nutrition residents recommend a daily intake of sodium of more than 1000 mg, from 1 gram of table salt containing 393 mg of sodium to convert, to meet the body's demand for sodium with the amount of salt per day.
Table salt is a double-edged sword, eating more salt in the body will increase, water will increase accordingly, excess water will remain in the body, requiring high blood pressure. Conversely, too little salt or no salt is bad for health, so sodium levels in the body that are too low or severe can lead to iodine deficiency. Nutrition experts warn the majority of customers, if science wants to eat salt, you can take the physical examination report to the hospital to consult a doctor, listen to thousands of rumors, do not be afraid of yourself, choose the right salt for yourself is the most important. (Reporter Ji Lei Lei Liang Jian Zhen)
WeChat circle of friends to spread "salt is not safe" is a rumor On the 27th, there were many people in the WeChat circle of friends who forwarded the harmful copy of potassium ferrocyanide in salt, please observe the additives of salt. On this matter, the reporter interviewed the Salt Industry Enterprise in Wuhan City, saying that the relevant authoritative departments of this question have long had a definite answer: potassium ferrocyanide is a legal food additive, and daily consumption of salt does not have to worry about safety. -08-28 10:43:30 Potassium ferrocyanide in domestic table salt is toxic? Recently, rumors about "potassium ferrocyanide in table salt are harmful to the human body" have once again spread on the Internet and the circle of friends. In June and February, rumors about the insecurity of salt were reprinted on the Internet and many media on major social exchange platforms, when the China Food Rumor Suppression Alliance repeatedly debunked rumors: potassium ferrocyanide in domestic salt does not bring harm to the human body. But only after June, rumors of unsafe salt have revived. -08-28 10:17:19 Yunnan police destroyed a salt counterfeiting gang and seized more than 360 tons of fake and shoddy salt Recently, the Qilin Branch of the Public Security Bureau of Qujing City, Yunnan Province, destroyed a criminal gang that produced and sold fake and shoddy salt, and seized and recovered more than 360 tons of fake and shoddy salt from fake "white elephant brands" and salt. -08-02 15:55:26
Source: Changsha News Network
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