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Pumpkin seed oil is rather expensive compared to other vegetable oils. Therefore, it is often adulterated by the addition of cheaper oils. In contrast to other edible oils, the content of Δ5-sterols is very low, while Δ7-sterols are dominating. The determination of Δ5-sterols, especially β-sitosterol has proven to be a good possibility to detect admixture of cheap vegetable oils to a level below which...
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