Identification of Cottonseed Oil Adulteration in Common Vegetable Oil
Objective:To establish a gas chromatography-mass spectrometry method for determination of vegetable oil adulterated with cottonseed oil.Method:The sample material was methylated with NaOH-methanol solution,centrifuged and filtrated.The final extract was analyzed by gas chromatography-mass spectrometry.Results:The limits of detection and quantification were 0.775 μg·g-1 and 2.557 μg·g-1,respectively,and the recoveries were 92.55%～94.67%.The lowest identification adulteration rate of soybean oil,sunflower oil,rapeseed oil and sesame oil was 3%,and that of peanut oil was 15%.Conclusion:The method is fast and easy to operate,and is suitable for identifying adulteration of cottonseed oil in vegetable oil.
gas chromatography-mass spectrometrysterculic acid methyl estersadulteration detectioncharacteristic fatty acids
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