Edible oil has become 'problem oil', and many batches of carcinogenic ingredients have been found, but many people are still buying
Edible vegetable oil is edible oil made from edible vegetable oil or vegetable crude oil. Common in life such as soybean oil, rapeseed oil, peanut oil, sesame oil, edible vegetable blended oil, etc.
China is the world's largest consumer of edible vegetable oil. In 2018, China's consumption of edible oil reached 37.67 million tons. There are many brands of edible oil in China, and many brands of edible oil have been found to contain carcinogenic ingredients.
Edible oil becomes "problem oil"
Recently, the country and various provinces have carried out random inspections on edible oils, and many batches of carcinogenic components have been found. The unqualified substances exceeding the standard are mostly aflatoxin, benzopyrene, acid value, peroxide value, and solvent residue. five. Judging from the published results, the average unqualified rate of China's edible oil spot checks is around 1.1%. In other words, 1.1 out of 100 oil companies will produce unqualified edible oil.
The dangers of problematic oils to the body
The acid value mainly reflects the rancidity of the oil in the food. The reason for the excessive acid value may be related to the lack of strict control of raw material procurement, substandard production process or improper product storage conditions, etc., especially when the storage temperature is high, it is easy to cause the oxidation and rancidity of the fat in the food, resulting in the excessive acid value. Foods with excessive acid value will have a savory taste, and the aldehydes, ketones, and acids produced when the acid value is too high will destroy fat-soluble vitamins. After eating, it may cause gastrointestinal discomfort, diarrhea and damage to the liver.
The peroxide value mainly reflects whether the fat in food is oxidized or deteriorated. Solvent residues are harmful substances only caused by the leaching process. In the edible vegetable oil quality standard, solvent residue is a common mandatory quality index.
Among them, the most harmful to the body are aflatoxins, benzopyrene and banned flavoring agents. Aflatoxin (AF) is mainly a metabolite of Aspergillus flavus and Aspergillus parasiticus. Aflatoxin is the most toxic and carcinogenic mycotoxin discovered so far, and has long been classified as Class I by the World Health Organization (WHO). carcinogen.
Aflatoxin cannot be destroyed by ordinary cooking, and it may not be completely removed even if it is sterilized at 100°C for 20 hours. yellow
The main damage site of aflatoxin is the liver. The physical and chemical properties of aflatoxin are quite stable and cannot be degraded in the human body, but can only be deposited in liver cells. When the amount of aflatoxin deposited exceeds the human body's tolerance, it will cause liver damage and even induce liver cancer.
In addition to being carcinogenic and mutagenic, aflatoxins also reduce immunity. Many epidemiological data show that hepatitis B patients and hepatitis B virus carriers are more likely to develop liver cancer under aflatoxin exposure than healthy people - and China is the hardest hit area for hepatitis B.
Benzopyrene is a by-product produced in daily life or industrial production, and it is one of the most toxic and strong carcinogens in polycyclic aromatic hydrocarbons. The Japanese have experimented with it on rabbits. Experiments have shown that when benzopyrene is applied to the ears of rabbits, tumors will grow on the ears of rabbits on the 40th day.
In order to attract consumers and improve the aroma of vegetable oils, some edible oil companies add banned spices, such as ethyl maltol, to their products. Excessive consumption will affect the human liver, and bones and joints will become brittle and cancerous in advance. In severe cases, it may also cause headache, nausea, vomiting, difficulty breathing, and even damage to the liver and kidneys, which is harmful to the human body.
How to Avoid Problem Oils
Many of the "problem oils" exposed this time are brands of small factories and workshops, such as Doli edible vegetable blend oil, Doli Zhenbao edible vegetable blend oil, and wild camellia oil produced by Hunan Gangkang Oil Industry Co., Ltd. . These are all edible oil brands that are hard to find in supermarkets.
Many people think that small workshops are pure natural and like to buy oil from small workshops. The conditions for storing raw materials in small workshops are not guaranteed, and there may be negligence in the processing process.
When buying edible oil, carefully check its trademark, pay special attention to the shelf life and the date of manufacture, and pay special attention to those without factory name, factory address, or reference quality standard code, and do not buy them casually. We still try to choose the big brand oils in regular supermarkets to make people feel more at ease.
According to the relevant national standards, most edible oils are generally classified into grades one, two, three and four according to the quality from high to low. The higher the grade, the more refined the oil, and the better the quality.
Generally, high-grade edible oil is light in color, and low-grade edible oil is dark in color (except sesame oil). Heat the oil to 150°C and pour it out. If it is high-quality edible oil, there should be no precipitation, otherwise there will be impurities. In addition, if there are layers, it may be an adulterated mixed oil.
The first choice for buying edible oil is physical pressing, because physical pressing has no chemical residues, and it is relatively safe at present;
Oil of good quality, the ratio of saturated fatty acid, monounsaturated fatty acid and polyunsaturated fatty acid is 1:1:1. Regular manufacturers generally indicate the content and proportion of these three fatty acids on the outer packaging of edible oil.
Summarize
When you buy edible oil, you must choose carefully, and don’t be greedy for cheap. As a daily necessities, we should try to eat high-quality edible oil to meet the nutritional needs of the human body.