The supramolecular chemistry of lipid oxidation and antioxidation in bulk oils

European Journal of Lipid Science and Technology - Tập 117 Số 8 - Trang 1095-1137 - 2015
Elizabeth S. Budilarto1, Afaf Kamal‐Eldin1
1Department of Food Science United Arab Emirates University Al‐Ain United Arab Emirates

Tóm tắt

The microenvironment formed by surface active compounds is being recognized as the active site of lipid oxidation. Trace amounts of water occupy the core of micro micelles and several amphiphilic minor components (e.g., phospholipids, monoacylglycerols, free fatty acids, etc.) act as surfactants and affect lipid oxidation in a complex fashion dependent on the structure and stability of the microemulsions in a continuous lipid phase such as bulk oil. The structures of the triacylglycerols and other lipid‐soluble molecules affect their organization and play important roles during the course of the oxidation reactions. Antioxidant head groups, variably located near the water‐oil colloidal interfaces, trap and scavenge radicals according to their location and concentration. According to this scenario, antioxidants inhibit lipid oxidation not only by scavenging radicals via hydrogen donation but also by physically stabilizing the micelles at the microenvironments of the reaction sites. There is a cut‐off effect (optimum value) governing the inhibitory effects of antioxidants depending inter alias on their hydrophilic/lipophilic balance and their concentrations. These complex effects, previously considered as paradoxes in antioxidants research, are now better explained by the supramolecular chemistry of lipid oxidation and antioxidants, which is discussed in this review.The evolution of micellar size and number during and after the induction period of lipid oxidation. Amphiphilic compounds, including lipid hydroperoxides, contribute to micelle formation and act as prooxidants. Antioxidants and retarders stabilize micelles and prevent their breakdown.

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Thông tin xuất bản

European Journal of Lipid Science and Technology

Tập 117 Số 8

1095-1137

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