Research on identification methods of sesame oil adulterated with palm oils

128 adulterated sample oils from 4 kinds of sesame oils blended with 4 kinds of palm oils with different melting points were prepared as raw materials.The methods of triglyceride, total and 2-position fatty acid composition of all adulterated sesame oils were studied to choose the best identification method.The results were as follows:when comparing with the data of pure sesame oils and national standard, the detection limits were 5% and 15% respectively in total fatty acid composition analysis method with 16:0 as standard to detect the limit.When comparing with the data of pure sesame oils, 18:2/16:0 and β-POO were chosen as indexes, the detection limits were lowest with 20% and 12% in 2-position fatty acid and triglyceride composition analysis methods, respectively.Considering the detection limit and difficulty level of analysis and operation procedure, for the identification of sesame oil adulterated with palm oil, the identification method of total fatty acid composition was the best method, the remaining two methods were validations and generally not given priority.