Antioxidative effectiveness of some natural antioxidants in sunflower oil.
Sunflower oil has been oxidized at 25 and 100 degrees C in the presence and in the absence of 0.01, 0.02 and 0.05% 3,4-dihydroxybenzoic acid, caffeic acid, esculetin and fraxetin. 3,4-Dihydroxybenzoic acid shows no antioxidative activity at either temperature. Esculetin possesses a relatively low effectiveness at 100 degrees C (stabilization factor F = 1.3 for 0.05% esculetin), and at 25 degrees C it does not improve the oxidative stability. Sunflower oil is more easy to stabilize at 100 degrees C: F = 3.0 for 0.05% fraxetin, and F = 1.9 for 0.05% caffeic acid. Native sunflower oil is much more difficult to stabilize than are its kinetically pure triacylglycerols.
Yanishlieva
N V
NV
Institute of Organic Chemistry with Center of Phytochemistry, Bulgarian Academy of Sciences, Sofia, Bulgaria.
Marinova
E M
EM
D000975:Antioxidants / Q000032:analysis*; D004042:Dietary Fats, Unsaturated; D062385:Hydroxybenzoates; D007202:Indicators and Reagents; D007700:Kinetics; D010084:Oxidation-Reduction; D010545:Peroxides / Q000032:analysis; D010938:Plant Oils; D000074242:Sunflower Oil; D014280:Triglycerides
D000975:Antioxidants; D004042:Dietary Fats, Unsaturated; D062385:Hydroxybenzoates; D007202:Indicators and Reagents; D010545:Peroxides; D010938:Plant Oils; D000074242:Sunflower Oil; D014280:Triglycerides; C009091:protocatechuic acid