Inhibition of stigmasterol oxidation by antioxidants in purified sunflower oil

A study was conducted to analyze the effect of the antioxidants butylated hydroxytoluene, alpha-tocopherol, ethanolic extracts of rosemary, and green tea on stigmasterol resistance against degradation and formation of its oxidation products in purified triacylglycerols (TAG) from sunflower oil. The...

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Bibliographic Details
Published in:Journal of AOAC International 2004-03, Vol.87 (2), p.499-504
Main Authors: Rudzinska, M, Korczak, J, Gramza, A, Wasowicz, E, Dutta, P.C
Format: Article
Language:English
Subjects:
alpha-tocopherol
antioxidants
Antioxidants - pharmacology
Biological and medical sciences
butylated hydroxytoluene
Fat industries
Food industries
Fundamental and applied biological sciences. Psychology
green tea
oxidation
Oxidation-Reduction
plant extracts
Plant Oils - metabolism
rosemary
stigmasterol
Stigmasterol - metabolism
stigmasterol oxidation products
Sunflower Oil
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Summary:A study was conducted to analyze the effect of the antioxidants butylated hydroxytoluene, alpha-tocopherol, ethanolic extracts of rosemary, and green tea on stigmasterol resistance against degradation and formation of its oxidation products in purified triacylglycerols (TAG) from sunflower oil. The content of stigmasterol and its oxidation products 7alpha- and 7beta-hydroxy, alpha- and beta-epoxy, triol, and 7-ketostigmasterol were determined during incubation at 60 degrees C for 3, 6, and 9 days. In addition, peroxide value and fatty acid composition were also determined in the samples. Correlation between the levels of the accumulated stigmasterol oxides and peroxide value of the TAG with antioxidants during incubation was significant only for rosemary extract (R = 0.6799, p < 0.05). The lack of correlation precludes the use of peroxide values to determine the level of sterol oxidation products in the used model system. Correlation between stigmasterol content and the level of stigmasterol oxides was significant for all samples (R = 0.8874, p < 0.05). The total increase of the stigmasterol oxidation products was the lowest in samples with alpha-tocopherol, but the content of stigmasterol-triol increased the most in this sample. In all the analyzed samples, alpha-epoxy-stigmasterol was formed in the highest amounts among the analyzed stigmasterol oxidation products.
ISSN:1060-3271
1944-7922
DOI:10.1093/jaoac/87.2.499