" oil of underground drainage " Danger is not " The underground drainage " It is most fatal to heat repeatedly

" oil of underground drainage " Danger is not " The underground drainage " It is most fatal to heat repeatedly
Recently, Wuhan the intersection of engineering institute and food science and Professor of project institute Dong He say, say while being flat, the underground drainage oil that our country returns to the dining table every year is 2 million - 3 million tons at present. According to the proportion, eat 10 meals each time, a one that ran into at once is the oil of underground drainage!
In several hundred cities in China, there is the one that retrieves oil of underground drainage to in every case have places of catering trade. According to the investigation, refine oil of a ton of underground drainages from the rubbish of kitchen cabinet of the catering trade, cost is only about 300 yuans. The person who draws the oil of underground drainage seems to be unattractive, in fact draw a barrel of oil on average and earn above seventy or eighty yuan. One usually can draw 4 barrels every day, after retrieving and refining, even if sell only according to half of the edible oil market price, can earn more than 10,000 yuan too every month, it is equivalent to the senior white collar's income.
He DongPing says, the aflatoxin is a kind of strong carcinogen for one of the main danger things in the oil of underground drainage, its toxicity is 100 times that of Arsenicum. In the view of scientific research worker, the difficult point of managing oil of underground drainage lies in, after through washing, distilling, decolorizing, taking off bad smellly etc. and refining the course, from appearance and sense organ only, it is very difficult to distinguish oil of underground drainage and ordinary oil.
As to the above-mentioned statement, famous nutritionist Fan ZhiHong has discussed one's own view in terms of nutrition health.
The greatest trouble of the oil of underground drainage
Say the toxicity of yellow aspergillus toxin is 100 times that of Arsenicum, this statement does not go against accepted conventions. The key trouble of the oil of underground drainage, does not lie in yellow aspergillus toxin, the ones that but lay in it are oily. Because yellow aspergillus toxin mainly exists in the peanut oil, come from the pollution before cooking, and in the underground drainage oil, it is not mainly peanut oil, the refinement of the oil of underground drainage will not produce yellow aspergillus toxin extraly either. Through refine, microbial index of it with qualified, moisture index can also so as to qualified, the color can become simple, everything seems very normal. But this must not conceal its enormous danger.
Talking about the oil of underground drainage, people all abhor, because think psychologically very dirty, very disgusting. However, in theory, harmful microorganism and physical impurity can be removed by refining, but other trouble can't be removed.
Unsuspecting, the endangers and does not come from " underground drainage " the most largelying of oil of underground drainage Two words, but come from " heating many times " With " oxidize " These two vocabularies.
Cooking the oil and frying and press oil of the restaurant thrown away is all the oil heated many times. In the restaurant, much eat material to need oil, much cooked food, pastry have needed to be fried. This certainly will bring the repeated heating of the oil, because no one will throw away a pot of oil after doing a fried dish, but will put back in the pan after pouring the oil again and again, continue being used in the oil and stir-fry. So, have a meal in the restaurant, will have the oil heated many times inevitably.
The liquid vegetable oil is actually heat-labile. Stir-fry, fried temperature are up to 160-300 , oil will take place until type different to construct, take and heat oxidize and hot cleavage, ring, ether, multi-type of getting together etc. react under the intersection of heating and terms. Vitamin E and essential fatty acid among them loss, totally, and harmful trans-fatty acid and saturated fat increase continuously gradually, the grotesque oil is oxidized and got together and is packed with with the ring product into it.

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