Conditions suitable for preparative isolation, quantitative separation and determination ofplastochromanol-8 (PC-8), and their mild oxidation products were elaborated. Mild oxidation of PC-8 alone and with gammatocopherol (gamma-T) equimolare mixture by benzoquinone gives four and two new products, respectively. These products give Emmerie-Engel reaction. Four of gamma-T, three of PC-8 and two mixed mild oxidation products were found in linseed (Leu number = 49). It was also found that PC-8 derived from plant oils was a natural antioxidant better inhibiting autoxidationthan alpha-tocopherol in the model system in which lard was the substrate.
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