Study On Recognition And Harm Of Waste Edible Oils In The Restaurants

Nowadays, some people get together the waste edible oil and sell it to the restaurants in lower price after it is refined simply in order to get more and lawless profits. It is terrible for people's health if it is eaten. And that it is difficult to distinguish between the waste edible oil by refined simply and the edible oil by people's sense organs. However, the study of harm and recognition of the waste edible oil have not been developed fully at present, so it is significant for the study of the waste edible oil.This paper analyses and evaluates four kinds of shaoshui-oils and two kinds of fried oils, comparing with four standard edible oils on sale. The harm and recognition has been studied completely at the first time. The progress has been reviewed on several aspects:1.The harm of the waste edible oil has been studied. The components of the waste edible oil are complicated and harmful. If it is eaten directy,it may induce many diseases, even cancer.2. The toxicology of the shaoshui-oil has been studied. The mices which ate the shaoshui-oil died after 120 days, and the mortality was more than 60% in 180 days.3. The recognition study of the waste edible oil. It can distinguish the shaoshui-oil by acid value(AV),water content, specific gravity, refractive index, oxidation value(OV),contents of heavy metal elements, distribution of the fatty acids and relative unsaturation value, varieties and contents hydrocarbons; It can distinguish the fried oil by acid value(AV), iodine value, distribution of the fatty acids and relative unsaturation value, varieties and contents hydrocarbons.4. The simple method of differentiating the waste edible oil. It can be distinguished by acid value(AV).5. The application of mathematical model. A mathematical model has been setup by means of chemoemtrics, so it can distinguish the eaten oil if it mix the shaoshui-oil or the fried oil.6. The establish of checking of the waste edible oil. It is controlled usefully by sense organs , physical and chemical indexes, and other methods of instrument.