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. 1974 Nov;10(5):1077–1083. doi: 10.1128/iai.10.5.1077-1083.1974

Bactericidal Activity of Metal-Mediated Peroxide-Ascorbate Systems

David B Drath 1, Manfred L Karnovsky 1
PMCID: PMC423065  PMID: 16558093

Abstract

Model systems containing ascorbate, hydrogen peroxide, and divalent copper or cobalt have been shown to possess marked bactericidal activity. At equivalent concentrations, copper-containing systems were more bactericidal than the corresponding mixtures containing cobalt. Cobalt at concentrations below 10−4 M did not appreciably augment microbicidal activity, whereas systems containing copper at concentrations as low as 5 × 10−6 M were still capable of causing some bacterial death. Manganese was inactive. None of these systems was as potent as the well known myeloperoxidase-peroxide-halide system. The mechanisms of action of these systems are not as yet clear. The possibility that they function through the generation of superoxide (O2−), hydroxyl radical (OH·), or other free radicals was explored through the use of superoxide dismutase and several free radical scavengers. It seems likely at present that the two active metal-mediated systems function via separate mechanisms. The copper system acts with dehydroascorbate, whereas the cobalt system does not. Activity in the cobalt system appears to depend upon the generation of free radicals.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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