1. Gutter oil generally refers to various types of inferior oil that exist in life, such as recycled cooking oil, repeatedly used frying oil, etc. The largest source of gutter oil is the grease trap in the sewers of large urban hotels. Gutter oil is not a product of the development of the food industry.
2. The Ministry of Health disclosed the gutter oil monitoring methods: 1. Freezing point detection method, 2. Transparency detection method, 3. Viscosity detection method, 4. Refractive power detection method, 5. Spectral property detection method. Folk methods
(for reference only):
①Put a peeled head of garlic (garlic) when cooking. Garlic is the most sensitive to aflatoxin. If the garlic turns red, use gutter oil. If the cooking oil is good, the garlic will be white. ②Put the oil at home in the refrigerator for 2 hours. If white foam appears, it is gutter oil.
③Look at the price. Generally, the packaging of gutter oil may be labeled as peanut oil, but the price is very cheap. For example, if the market price of peanut oil is around 15 yuan, the price of gutter oil may be only half of that, around 7 yuan. ④Put a small amount of oil on the palms of your hands and rub it repeatedly with both hands until your palms become warm and smell. Good oil has the fragrance of raw materials, while gutter oil has a pungent smell. ⑤The simplest and most direct way is to drop it on the paper. It will burn nicely without any smell or smoke! ⑥According to experience, edible vegetable oils can generally be identified by looking, smelling, tasting, listening, and asking questions.
3. The first three are more accurate.