Abstract
A method for determining the mixing ratio of rice bran oil or rapeseed oil in an adulterated sesame oil was developed using ten sesame oils, six rice bran oils and fourteen rapeseed oils.Adulterant oil content in sesame oil could be estimated as rice bran oil based on that of two unsaponifiable components with relative retention times (RRT) of 1.19 and 1.55, and as rapeseed oil based on the percentages of linolenic acid (18 : 3) and an unsaponifiable component (brassicasterol) with RRT of 0.69.Fatty acid pattern similarity (cos θ) for sesame oil adulterated with rice bran oil or rapeseed oil and pure sesame oil was demonstrated. √ (1-cos θ) 106, was expressed as √ 2 sinθ/2 × 103, a function proportional to the mixing ratio of rice bran oil or rapeseed oil. For a given adulterant oil the mixing ratio could be determined based on the fatty acid pattern similarity.
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