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. 1984 Nov 1;223(3):755–759. doi: 10.1042/bj2230755

Evaluation of alpha-tocopherol antioxidant activity in microsomal lipid peroxidation as detected by low-level chemiluminescence.

E Cadenas, M Ginsberg, U Rabe, H Sies
PMCID: PMC1144359  PMID: 6508739

Abstract

The significance of microsomal vitamin E in protecting against the free-radical process of lipid peroxidation was evaluated with the low-level-chemiluminescence technique in microsomal fractions from vitamin E-deficient and control rats. The induction period that normally precedes the ascorbate/ADP/Fe3+-induced lipid peroxidation was taken as reflecting the microsomal vitamin E content and was found to be 5-6-fold decreased in microsomal fractions from vitamin E-deficient rats. Supplementation of microsomal fractions from vitamin E-deficient rats with exogenous vitamin E partially restores the induction period observed in that from control rats. The decrease in chemiluminescence intensity and the increase in the induction period both correlate linearly with the amount of vitamin E added. However, the efficiency of exogenous vitamin E is about 50-fold lower than that exerted by the naturally occurring vitamin E in microsomal membranes. These observations are discussed in terms of the process of re-incorporation of vitamin E into membranes, the experimental model for lipid peroxidation selected, and the method to evaluate lipid peroxidation, namely low-level chemiluminescence.

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Selected References

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