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Protection factors of methyl, ethyl, propyl, and butyl esters of caffeic acid measured in FAME prepared from original sunflower oil (tocopherol-free test medium), in tocopherol-stripped sunflower oil (total tocopherols 8.7 mg/kg) and in original sunflower oil (total tocopherols 149.0 mg/kg) using the Rancimat method. Error bars express SD (n = 3). a,b,cdifferent letters in the same group indicate significant differences (p<0.05).
