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| Identification of waste oil based on change of fatty acid alkyl esterscontent in edible vegetable oil |
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| DOI：10.12166/j.zgyz.1003-7969/2020.01.010 |
| KeyWord:vegetable oil fatty acid alkyl ester waste oil identification |
| FundProject:湖北省食品药品监督管理局2018—2019年度科研项目（201802009） |
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| Abstract: |
| The content of fatty acid alkyl esters (including fatty acid methyl esters and fatty acid ethyl esters) in six kinds of vegetable oils was analyzed by gas chromatography-mass spectrometry using solid phase extraction column purification. The change of their content in the process of frying, discarding and waste oil refining were studied. It was found that the contents of fatty acid alkyl esters in six kinds of vegetable oils were below 30 mg/kg, and vegetable oils might produce large amounts of fatty acid ethyl esters in discarding. The amount of fatty acid ethyl esters produced depended on whether the oil was cooked or not and content of ethanol in the waste. Fatty acid alkyl esters could not be removed in bleaching process, but could be removed in deodorization. So waste oils could be identified by determining the content of fatty acid alkyl esters in vegetable oils, which provided a new idea for the identification of waste oil. |
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