| Autor: |
Kim, Joo-Shin, Godber, J., King, J., Prinyawiwatkul, W. |
| Zdroj: |
Journal of the American Oil Chemists' Society (JAOCS); Jul2001, Vol. 78 Issue 7, p685-689, 5p |
| Abstrakt: |
The inhibition of cholesterol autoxidation by nonsaponifiable fraction from rice bran oil (700, 1400, and 2100 ppm) was studied in an aqueous model system for 16 h at pH 5.5 and 80°C. Antioxidant effectiveness was investigated by following the loss of cholesterol and the formation of 7-keto-cholesterol. The changes in levels of vitamin E vitamers and γ-oryzanol in the system were determined during cholesterol autoxidation. The 2100 ppm treatment produced a 92% reduction of 7-ketocholesterol, 1400 ppm an 82% reductions and 700 ppm a 64% reduction after 16 h, whereas without the nonsaponifiable fraction, the samples showed almost complete degradation of cholesterol. Vitamin E vitamers decreased ( P<0.05) in all treatments, but γ-oryzanol was not significantly ( P<0.05) reduced in the 2100 ppm treatment. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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