Promotion of Radiation Peroxidation in Models of Lipid Membranes by Caesium and Rubidium Counter-ions: Micellar Linoleic and Linolenic Acids

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Abstract
Caesium and rubidium counter-ions increase peroxidation in irradiated micelles of linoleic (18 : 2) and linolenic (18 : 3) acids. The effect is specific to Cs+ and Rb+ in the alkali metal series. The effect is independent of the salts used (Cl−, NO3−, ClO4−) and, therefore, independent of the chaotropic nature, and reactivity with hydroxyl radicals of Cl−, NO3− and ClO4−. The promotion of peroxidation by Cs+ and Rb+ is interpreted in terms of their effect on fatty acid micelle structure. The dependence of radiation peroxidation on lipid structure in the micelles may be significant for studies of peroxidation in highly structured cell membranes.