Effects of peroxides on permeability and their modification by indoles, vitamin E, and other substances.

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Abstract
Some organic peroxides such as ROOR'', ROOH, and H2O2 altered the permeability of Beta vulgaris root cell membranes, releasing thereby the red pigment which these cells contain. The relative effects of peroxides on growth and permeability were, in general, similar. The injurious effect of peroxides were not Ca-ion reversible, but were reduced by certain antioxidants, especially indoles, a-tocopherol, some vinyl ethers, and thiols. Protection was given by 10-4 [image] indoles and a-tocopherol only against cumene hydroperoxide (10-3 [image]), but not at all against 10-1 1 [image] H2O2. In contrast, all more polar protectants such as vinyl ethers and cysteine at 10-4 [image] were effective against H2O2, but not against the hydroperoxides. Some ethers intensified pigment release.