Who can borrow a pair of eye-catching eyes and see if there is any waste oil in the dish? "Put your own edible oil into the refrigerator at about 8 °C, if it is condensed, it is the waste oil. Please tell each other!" Some time ago, a message about the simple method of identifying the waste oil was crazy on all microblogs. Forward.
Many citizens are skeptical about this. The experts on nutrition and food safety in the city said that it is not scientific to simply identify the waste oil at the freezing point. There is no effective way to easily detect the waste oil.
Freezing point should not be used as a test standard
On November 4th, the netizen "old house" of the city forwarded a microblogging titled "Deep-growing oil to make children into inventors" with doubts. According to Weibo, Lin Lijun, a high school student from Shanghai Xiangming Middle School, invented a simple method for identifying trench oil: the waste oil is used repeatedly, and the animal oil content is high. Compared with vegetable oil, the viscosity is different. Ordinary vegetable oil should be zero degree, and the waste oil will condense at 8 °C. Put the edible oil purchased by yourself into the refrigerator at a temperature of about 8 °C. If it is condensed, it is the waste oil.
Many netizens have commented that "good way, smart" and "try it right away", but some netizens have questioned. According to past experience, peanut oil will also condense under low temperature conditions. Is this Weibo trusted?
"This is not scientific, how can the identification of waste oil be so simple?" Chen Jianying, a nutrition and food safety expert, said that the freezing point of edible oil is mainly determined by the ratio of saturated fat to unsaturated fat in oil. Vegetable oil is mainly unsaturated fat, and the freezing point is low. For example, the freezing point of soybean oil, rapeseed oil and sunflower oil is below -10 °C, and peanut oil and cottonseed oil are higher, also around 0 °C. Animal oils have a high content of saturated fat and are usually present in solid form at room temperature. However, vegetable oils also have high freezing point and high freezing point, such as palm oil and coconut oil, and the freezing point is above 25 °C. In addition, the freezing point of the oil is not a certain temperature, but a range. Even if the oil of the same plant is not exactly the same, its coagulation properties will be different.
For example, Chen Jianying said that there is a type of "reconciliation oil" on the market, and their solidification temperature will be determined by the variety and proportion of the oil to be mixed. It is conceivable that by means of temperature method, vegetable oils such as peanut oil and "harmonic oil" will be directly "killed".
There is currently no easy way to identify trench oil.
So, is there an easy way to identify the waste oil?
"The detection of waste oil should have very strict standards. It is necessary to comprehensively consider various factors and then propose specific indicators. In fact, up to now, there has not been a direct method for identifying waste oil from the country to the local." Chen Jianying said. At present, the state is organizing relevant personnel to conduct analysis, and then put forward some unique indicators. If the specific indicators contained in the edible oil are detected, it is recognized as waste oil.
"Although the oil in the trench is difficult to identify, it is necessary for the public to understand the characteristics of some waste oil and always maintain a sense of prevention." Chen Jianying said that when purchasing edible oil, the following measures can be used to distinguish the quality of edible oil.
A look at the color of the oil. Good cooking oil looks transparent and clear. Because the trench oil has a variety of chemical components, it will be turbid and opaque, and there may be sedimentation at the bottom of the bottle, so try not to buy edible oil with precipitate.
Second smell. Each oil has its own unique scent. You can drop a drop of oil on your palm, rub your hands together, and smell the smell when you are hot. An oil with an odor indicates a quality problem.
Three look at the brand. Should try to choose the edible oil produced by the big brand. Relatively speaking, the quality of large brand edible oil is relatively safe, and it is easier to obtain compensation if the quality of the edible oil purchased is high.
Fourth, look at the effective nutrient content. Usually, the content of vitamin E and unsaturated fatty acids is high, and the nutritional value of edible oil is high. Therefore, when purchasing, you can compare the marked content. Chen Jianying said that vitamin E and unsaturated fatty acids are very important. From a nutritional point of view, consumers are advised to choose more vegetable oils and less animal oils.
Semi-Round Sensor Automatic Dustbin
Stainless Trash Can,Semi-Round Sensor Automatic Dustbin,Semi-Round Series Sensor Dustbin,Semi-Round Sharp Sensor Dustbin
NINGBO ZIXING ELECTRONIC CO.,LTD. , https://www.zixingautobin.com