Natural antioxidants in winter rape (Brassica napus) seed
1998
Zukalova, H. | Vasak, J. (Ceska Zemedelska Univ., Prague-Suchdol (Czech Republic))
Rape seeds contain the natural antioxidants tocopherols and phenolic compounds. Tocopherols were determined by high pressure liquid chromatography. Their content for gamma-tocopherols ranged from 770 to 450 ppm and for alpha-tocopherols from 200 to 400 ppm. One zero varieties of rape seed had lowest content of gamma- and alpha-tocopherols compared with double zero ones. During storage of rape seed in silos, content of gamma-tocopherols decreased on average by 12.5% and alpha-tocopherols on average by 34%. This antioxidant extracted with oil and during the technological process of producing oil is distracted. The content of free phenolic acid in the present varieties ranged from 0.56 to 0.92%. Their decrease appeared in the samples which were desiccated with desiccant Reglone 4 days before the expected harvest and it is similar to the content of phenolic compounds in immature seed 14 days before harvest.
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