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The fluorescence emitted from rat liver microsomal membranes which had undergone enzymatic and nonenzymatic lipid peroxidation was detected directly. This fluorescence produced in peroxidized membranes increased progressively with peroxidation reaction time, and the fluorescent substances produced were retained in the membranes without being released into the aqueous phase. Extracts of the peroxidized membranes with organic solvents (chloroform/methanol) emitted fluorescence which was also dependent on the peroxidation reaction time. The generation profiles of fluorescence emitted from both the peroxidized membranes and their extracted membrane lipids differed essentially from that of thiobarbituric acid-reactive substances which reached a plateau at a relatively early stage of peroxidation reaction. These results indicate that lipid peroxidation induces stepwise chemical and physical changes in membranes and that the fluorescence from peroxidized membranes will be useful in studying such changes occurring in biological membranes.
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