how to distinguish gutter oil?

I'll teach you how to distinguish gutter oil skillfully!

As soon as the news of gutter oil comes out, diners have a psychological shadow about going out to eat. When faced with the delicious dishes in restaurants, as long as they think that they may be made from gutter oil, they suddenly lose their appetite. However, it is inevitable to eat out now. Wang Sheng, the executive chef who has been engaged in the restaurant industry for many years, said that as long as he knows how to order and know the tricks, he can still eat healthily and safely and avoid eating gutter oil.

Don't touch the fried breakfast in roadside stalls

Waste oil probability: 91%

Dishes: fried or fried breakfast stalls, fried noodles and fried rice stalls (shops), barbecue stalls (shops), etc.

Reason: "old oil" is used in every shop, especially fried oil, and fried oil will generally be used to change color. After that, it will not be filtered again. Roadside stalls with small storefronts and poor sanitation, especially those engaged in frying or barbecue, have low cost and huge demand for oil. In order to seek profits, it is almost inevitable to use waste oil.

Do not order boiled food in red oil and order boiled food in white oil

Chance of cooking oil: 51%

Dishes: Sichuan cuisine, Chongqing cuisine, Hunan cuisine and other series of boiled food in red oil, fried food (such as fried chicken, street burger)/roast duck, roast duck, Cantonese-style roasted meat, etc.

Reason: According to the survey, Sichuan cuisine and Hunan cuisine are the cuisines where cooking oil is frequently used. Because some Sichuan cuisine and Hunan cuisine can't use gutter oil, and not all Sichuan cuisine and Hunan cuisine merchants are black-hearted businessmen. For example, the white oil series dishes like Sichuan cuisine must use clean oil products because of their outstanding fragrance and clear color. Therefore, diners who love spicy food, as long as they order less Sichuan or Hunan dishes with heavy oil, will also reduce the chance of eating gutter oil.

beware of cooked food and fast food

the probability of gutter oil: 31%

dishes: finished cooked food, box lunch, business package, etc

reason: for many busy white-collar workers, lunch is basically solved by fast food. Wang Sheng, the executive chef, said that when eating cooked food, fast food and box lunch, there is still a chance of eating gutter oil. It is suggested to choose a clean and hygienic fast food restaurant as far as possible, because if the external hygiene of a storefront cannot be guaranteed, how can you believe that they have not used gutter oil?

steamed Chinese food is the safest

the probability of gutter oil: 1%

dishes: steamed seafood, seafood, soup, crispy electric heart, cold salad and so on

reason: it is almost impossible for people who cook traditional Chinese food to use gutter oil, because gutter oil can't make good dishes in dishes that pay attention to oil. If you want to eat safely outside, try to order light dishes with less oil, such as steamed dishes, fried dishes and seafood, which will not use waste oil, because if you use them, the products will be ugly. There is also a store with a good overall environment, and the less chance of using waste oil products.

It's an expert trick

How to distinguish gutter oil from "black restaurants"

Which restaurant can eat safe cooking oil? Which black-hearted restaurant hides waste oil? If you are a diner who eats out all day, you should first practice the following tricks taught by Chen Qiang, a senior diner in Dongguan, so as to know how to distinguish the gutter oil and find out the gutter oil restaurant, so that you can always wander in the Jianghu without being stabbed by gutter oil.

There are many problems with the sediment in the turbid zone.

Look at the transparency of the oil. If it is pure and has a good color, it is clean oil. If it is turbid, it is old oil or gutter oil. You can also taste the oil. If it tastes sour, it is unqualified. If it tastes bitter, it means that the oil has been rancid. If it smells bad, it may be gutter oil.

You can tell whether the scrambled eggs with chopped green onion are tender or not

If you want to know whether this restaurant uses gutter oil, you can tell by ordering one dish, that is, scrambled eggs with chopped green onion. This is also a person who is not sensitive to taste, and it is the simplest dish to distinguish the oil in the restaurant. If the dish is golden, tender and clean, it must be clean oil. This is especially suitable for small shops. Generally, small restaurants either use all waste oil or all normal oil. And whether you go or stay depends on this scrambled egg with chopped green onion.

Observe the sauce and observe the layering of soy sauce+oil

I'm afraid that oil is difficult to distinguish in vegetables, so I might as well order a sauce with soy sauce and add oil, then shake it, wait for the layering and pour it into a glass. The soy sauce will be layered quickly, but there will be filiform soy sauce left at the bottom of the oil layer, which may be old oil or waste oil. The fresh and clean oil is generally stratified quickly, and the stratification is quite clear.

If I'm afraid it's too different ... > >

how can ordinary people quickly identify gutter oil? 11

The easiest way to detect gutter oil is to put a peeled garlic in cooking, and garlic is the most sensitive to aflatoxin. If the garlic turns red, it is gutter oil, which contains a lot of aflatoxin, and the edible garlic is white. Put the oil in the refrigerator for 2 hours. If white foam appears, it is gutter oil. The freezing point of gutter oil is relatively high, and it will freeze at 8 degrees Celsius, while normal oil will not freeze until 1 degrees Celsius.

How to identify gutter oil?

Identification method of gutter oil:

Look at it: see the transparency and color. The color is dark, turbid, and there is sediment. It may be gutter oil that is easy to solidify at low temperature. The first detection trick is to pour a little oil on the popsicle, and the oil will soon solidify and adhere to the popsicle, which is probably made of waste oil. The second trick is to pour a little oil on the glass. If the oil flows slowly, there may be a problem.

second smell: each oil has its own unique smell. You can drop a drop or two of oil on your palm, rub your hands together, and smell it carefully when you are hot. It's probably the gutter oil that smells bad and smells faint.

three tastes: take a drop of oil with chopsticks and taste it carefully. The oil with peculiar smell may be gutter oil, the cooking oil containing gutter oil is not fragrant, and the residual oil residue is black charcoal.

four listening: take one or two drops of oil from the bottom of the oil layer, spread it on flammable paper, light it and listen to its sound. If the combustion is abnormal and makes a "squeaky" sound, the water content exceeds the standard and it is an unqualified product; When burning, it makes a "crackling" explosion, indicating that the water content of the oil is seriously exceeding the standard, and it is possible to adulterate the product, so it is absolutely impossible to buy it.

five questions: ask the merchants about the purchase channels, and if necessary, ask for the purchase invoice or check the sampling inspection report of the local food hygiene supervision department.

Physical and chemical inspection of gutter oil

Moisture content, specific gravity, refractive index, saponification value, acid value, carbonyl value, peroxide value, iodine value, heavy metals, relative unsaturation of fatty acids, cholesterol, residue detection, oxidation product detection, conductivity of gutter oil, and so on.

how to distinguish gutter oil and what are the good methods?

Five methods for identifying waste oil

1 Grease is easy to solidify. Waste oil is easy to solidify or semi-solidify in winter with low temperature, but it can be tested in the refrigerator in summer. The vegetables packed in the refrigerator are taken out in a few hours. If the oil has solidified or semi-solidified, it means that the oil quality is poor, or animal oil such as lard is used, and the content of trans fatty acids and saturated fatty acids is high. Eating too much of this oil is not good for the heart.

2 The oil in the dish is turbid. The color of gutter oil darkens during heating, and it is estimated that it is inferior oil that has been used many times. There are many harmful impurities added in the production process, while the pure oil is clear and colorless.

3 vegetarian dishes taste like meat. This 81% has been "poisoned" by the gutter, which is formed by repeatedly refining old oil and adding new oil.

4

Very greasy. Fresh and qualified vegetable oil is refreshing and greasy, and it is easier to rinse off the oil if you rinse it in water. The gutter oil tastes sticky, and it is difficult to remove layers of oil stains by brushing the bowl. In addition, you can also drop a few drops of oil on your fingers and rub them back and forth with your fingertips. If you feel sticky, it is very likely to use waste oil.

5

Diarrhea is the most common. If you don't have special food allergies at ordinary times, and you have uncomfortable symptoms such as diarrhea after eating, then the possibility of eating gutter oil is great.

How to distinguish waste oil (true and false edible oil)

Once "waste oil" enters the market, consumers should learn sensory identification. According to the experience, the true and false edible vegetable oil can be identified by looking, smelling, tasting, listening and asking. At first glance: look at the transparency, pure vegetable oil is transparent, and the transparency will decrease due to the mixing of alkali grease, wax and impurities in the production process; Look at the color, pure oil is colorless, in the production process, because the pigment in the oil is dissolved in the oil, the oil will be colored; Look at the sediment, its main component is impurities. Second smell: Each oil has its own unique smell. You can drop a drop or two of oil on your palm, rub your hands together, and smell it carefully when you are hot. Oil with odor indicates that there is a problem with the quality, and it is likely to be waste oil with odor; If there is a smell of mineral oil, you can't buy it. Third taste: take a drop of oil with chopsticks and taste it carefully. The oil with sour taste is unqualified, the oil with bitter taste has been rancid, and the oil with peculiar smell may be "waste oil". Listen 4: Take one or two drops of oil from the bottom of the oil layer, smear them on flammable paper, light them and listen to their sound. The products with normal combustion and no noise are qualified products; If the combustion is abnormal and makes a "squeaky" sound, the water content exceeds the standard and it is an unqualified product; When burning, it makes a "crackling" explosion, indicating that the water content of the oil is seriously exceeding the standard, and it may be an adulterated product, so it is absolutely impossible to buy it. Five Questions: Ask the merchants about the purchase channels, ask for purchase invoices or check the sampling inspection report of the local food hygiene supervision department if necessary. In addition, using the relationship between metal ion concentration and conductivity, the amount of metal ions in oil can be judged by detecting the conductivity of oil. Many experiments show that the conductivity of swill oil is 5 to 7 times that of first-class edible oil, so swill oil can be accurately identified. Attachment: Methods for distinguishing true and false edible oils: First, color: generally, high-moral edible oils are light in color, while low-moral edible oils are dark in color (except sesame oil), and the color depth of oils is slightly different because of their different varieties, so the processed inferior oils are darker than qualified edible oils; Second, the smell: different varieties of edible oil have their own peculiar smell, but there is no sour smell; Third, sediment: high-quality edible oil has no sediment and suspended matter, and its viscosity is small. Fourth, transparency: generally, high-quality edible oil has good transparency and no turbidity. If there is much water in the oil, or the oil deteriorates, or the fake oil is mixed, the oil quality will be turbid and the transparency will be low; The taste and color of "gutter oil" are difficult to get rid of, and "gutter oil" is mixed with kerosene, detergent and pepper in hotels and restaurants, which has a heavy smell, which is not easy to get rid of with general skills. "Waste cooking oil" is mixed with vegetables, red peppers and other colors, so it is difficult to purify it. Moreover, people who manufacture and sell "waste cooking oil" are generally unable to carry out "high-tech deep processing". In view of this, the following points should be grasped first to distinguish "gutter oil": normal edible oil is clear and shiny, while "gutter oil" is turbid and sticky, with dark color contrast; Normal edible oil has a fragrance, while "gutter oil" has an odor; Normal edible oil will boil immediately after cooking, while "gutter oil" has a low boiling point, so it takes a long time for the food to react after cooking. There are also "gutter oil" which is refined after rough processing, and mixed with bulk edible vegetable oil through distillation, filtration, refining and blending, and flavoring, and its appearance color and taste are difficult to identify intuitively. Consumers are advised to buy edible oil, preferably in a big supermarket or a regular grain and oil business unit. When purchasing, they should also recognize the trademark, manufacturer and site.

how to distinguish gutter oil?

the state and relevant departments are still discussing and demonstrating the detection methods of gutter oil, and the following points are summarized for your reference.

Four tricks can be distinguished:

1. Taste: If the oil taste contains spicy taste, it is probably edible oil refined from waste oil;

2. odor identification: put a small amount of cooking oil in your palm and rub it back and forth with your palm. If there is odor in it, it is likely to be mixed with gutter oil;

3, put in the refrigerator: put the oil in the refrigerator at 5-8 degrees Celsius. After 2-4 hours, it will solidify and crystallize, which is likely to be waste oil. Because animal oil with considerable oil content is added to waste oil.

4. High fire: If the color of the oil changes after high fire, and the color becomes thick and black, it means that it is probably gutter oil, because the small particles contained in gutter oil are easy to change color after burning.

5. Look at the oil transparency. Authentic cooking oil is clear and transparent. When you put a note on one side, you can clearly see the words on the opposite side in the light from the opposite side, while the gutter oil is definitely turbid. The more you mix, the more turbid the oil is.

How to tell whether it is gutter oil in life

There is a simple way to distinguish gutter oil

1. Look at the color. Passing oil is transparent, while gutter oil has many chemical components, which will be turbid and opaque, and there may be precipitation at the bottom of the bottle. This kind of inferior oil can be seen in bulk oil wholesale markets, and small restaurants on the street may also use inferior oil.

2. smell the smell. Passing oil will have the smell of oil itself, for example, peanut oil will have the smell of peanuts; Olive oil will have the fragrance of olives. Gutter oil has no fragrance that oil itself should have. If you smell it carefully, you can smell a little sour and have a strange smell of chemical components.

3. Taste it. Usually, when buying oil, you can identify it by looking at the color and smelling it. However, after buying the oil, the chef will dip a drop of oil in the palm of his hand with chopsticks, rub it gently, and lick a little oil in the palm with the tip of his tongue. Normal oil will taste fragrant. For example, peanut oil will taste like peanuts, but waste oil will taste sour and bitter. These three simple methods are the most commonly used in the whole chef industry, and consumers can also use these three methods to identify them. Don't eat oil that feels bad.

4. after eating. The oils used in restaurants are all tampered with, so it is difficult to identify them. However, after eating the dishes made from waste oil, the stomach will swell, the stomach and intestines will feel uncomfortable, and there will be indigestion. This method may not be called a method, because you have to eat it before you can have an uncomfortable reaction.

Street vendors and restaurants generally use cheap oil in bulk to reduce costs, so it is more likely to use waste oil. When consumers go out to eat, they can choose larger restaurants with good brands and good reputation, because they have regular channels for purchasing edible oil, and they can generally feel more at ease

How to distinguish waste oil

Generally, the oil is clear and has corresponding fragrance before it is used, while the waste oil will be turbid, pungent or have no taste

After cooking, ordinary oil will be naturally watery. Even if it's cold, it will form a lump like animal oil, and the gutter oil will generally dilute, and it will flow like water after freezing. It won't be like natural oil, and you can't just use gutter oil in the process of cooking. Otherwise, you can't fry it.

I'm the best at how to tell whether cooking oil is gutter oil.

I'll teach you the simplest three tricks.

Look at the transparency. Pure vegetable oil is transparent in the production process.

according to the color, the pure oil is colorless, and it is produced by