An inhibition by the semisynthetic polyphenols bearing bicyclic isobornyl substituents and OH groups arranged variously relative to each other was investigated in the presence of lecithin. A decreased efficiency of the inhibition by the phenolic antioxidants in the presence of soy bean lecithin, which manifests itself as the increased initial oxidation rate, has been revealed. The most significant changes in the inhibitory effect were found for a polyphenol containing the OH groups at the meta position, while those the smallest ones were observed for the para position relative to each other. In the case of meta-substituted polyphenol, the decreased stoichiometric inhibition coefficient was observed along with the increased initial oxidation rate. The formation of lecithin complexes with polyphenols was detected by UV-Vis and IR spectroscopy, which leads to a decrease in their inhibitory effect.

中文翻译：

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在卵磷脂存在的情况下，不同位置含有 OH 基团的多酚的抑制作用

在卵磷脂的存在下研究了带有双环异冰片基取代基和彼此不同排列的 OH 基团的半合成多酚的抑制作用。已经揭示了在大豆卵磷脂存在下酚类抗氧化剂的抑制效率降低，这表现为初始氧化速率增加。对于在间位含有 OH 基团的多酚，发现抑制作用的最显着变化，而在彼此相对的对位观察到最小的变化。在间位取代的多酚的情况下，随着初始氧化速率的增加，观察到化学计量抑制系数降低。通过紫外-可见光和红外光谱检测卵磷脂与多酚复合物的形成，