Where is the waste oil poison?
Source of waste oil
"Irrigation oil" has also been called by the industry people as "hair oil." There are three main sources: First, the oil that is left over with the leftovers in the muddy water, that is, the drowning oil; the second is the oil used for the elimination of fried foods, namely Deep-fried oil; third is the cooking oil and drained into the sewer with the brush pot water.
There is also a “new type of waste oilâ€. Unlike traditional waste oil, it is mainly an oil produced after simple processing and refining of inferior, expired and corrupted animal skins, meat and internal organs.
According to Professor He Dongping of the School of Food Science and Engineering of Wuhan Polytechnic University, there are 2 million to 3 million tons of waste oil that is returned to the table every year. According to the ratio, every time I eat 10 meals, there may be one meal that I run into.
Where is the waste oil poison?
Once the waste oil has flowed into the table, there will be endless troubles. In particular, the “new type of waste oilâ€, which contains many germs, has become a direct threat to human health.
The main hazard of "ditch oil" is aflatoxin, which is a strong carcinogen and its toxicity is about 10 times that of potassium cyanide and about 100 times that of arsenic.
[Encyclopedic knowledge]
Aflatoxin is a compound with strong biological toxicity. It is often produced by molds of fungi such as Aspergillus flavus and Aspergillus parasiticus in moldy grains. It is by far the most powerful carcinogen and more than 20 species have been discovered. Among them, aflatoxin B1 is the most common, and its toxicity and carcinogenicity are also the strongest. Aflatoxin mainly contaminates grain, oil, foodstuffs, animal and plant foods, etc.; such as peanuts, corn, rice, wheat, beans, nuts, meat, milk and dairy products, aquatic products, etc. are contaminated with aflatoxin. Among them, peanuts and corn are the most polluted.
The greatest harm to the waste oil is not only the carcinogenic aflatoxin, but also from multiple heating and oxidation. The liquid vegetable oil is not heat-resistant. The cooking and frying temperatures can be as high as 160°C-300°C. When the oil is heated, trans-isomerization, thermal oxidation, thermal cracking, cyclization, etherification, polymerization, etc. occur. Kind of reaction. After edible oil is repeatedly heated by frying, roasting, frying, and frying, it will produce polycyclic aromatic hydrocarbons, which have a strong carcinogenic, DNA damage, and teratogenic effects on the fetus.
Does eating more cause death?
Well, if you eat too much ground oil, it will cause death. Let's make the following calculations:
If the toxicity of aflatoxin (by mass) is 100 times that of arsenic, is it safe to have 10 micrograms of aflatoxin per kilogram of oil?
If the daily intake of adult edible oil (recommendation) is W (g) body weight (kg) * 0.45 (g/kg), an adult of 65 kg in weight consumes 29.25g of edible oil per day, in 30g, intake The aflatoxin (the upper limit of compliance) is 30*1/1000 μg=30 ng, ie, 3*10^(-8) g.
The toxicity of aflatoxin is 100 times that of arsenic, and the lethal dose can be as low as 0.001g or 10^(-3)g. It takes about 3.3*10^4 days to die. Can people's life last for 30,000 days?
Professor He Dongping of Wuhan Polytechnic University also publicly stated that the report on the toxicity of waste oil has been exaggerated. As the head of the Oil and Grease Working Group of the National Grain and Oil Standardization Committee, He Dongping said: “After eating, it will not kill people. After he processed it, you will certainly not die, but from an ethical standpoint, one can’t stand it. ."
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