Niger seeds (Guizotia abyssinica Cass.), which are of interest as a new source of vegetable oils, were subjected to Soxhlet-extraction with n-hexane and the extract analysed using a combination of CC, GC, TLC and normal-phase HPLC. The total lipid content was ca. 300 mg/g seed material, and the
Crude vegetable oils are usually oxidatively more stable than the corresponding refined oils. Tocopherols, phospholipids (PL), phytosterols, and phenols are the most important natural antioxidants in crude oils. Processing of vegetable oils, moreover, could induce the formation of antioxidants.
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