Abstract
Adulteration of expensive edible oils, such as olive oil, often involves desterolized oils in order to render the adulteration undetectable. Sunflower oil contains characteristic Δ7-sterols, which are readily removed upon strong bleaching. It is shown that these Δ7-sterols do not primarily dehydrate (as do Δ5-sterols), but isomerize to Δ8(14)- and Δ14-sterols. These compounds can be analysed by LC on silica gel or GC on capillary columns with stationary phases of intermediate to high polarity.
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Biedermann, M., Grob, K., Mariani, C. et al. Detection of desterolized sunflower oil in olive oil through isomerized Δ7-sterols. Z Lebensm Unters Forch 202, 199–204 (1996). https://doi.org/10.1007/BF01263540
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DOI: https://doi.org/10.1007/BF01263540