The interactions between MnO2+/Mn3+ complexes and ascorbates. A pulse radiolysis study.
The reactivity between various MnO2+/Mn3+ complexes and ascorbic acid/ascorbate were studied using pulse radiolysis. Experimental results indicate that Mn3+-sulfate reacts with both AH2/AH- via metal-ascorbate complexes. MnO2+-formate and Mn3+-pyrophosphate both appear to react by electron transfer with no evidence of complex formation. All of these metal complexes, with the exception of Mn3+-pyrophosphate, react as fast or faster with ascorbate than free O2-. The significance of this observation in light of metal-induced oxygen toxicity will be discussed.
Cabelli
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Chemistry Department, Brookhaven National Laboratory, Upton, NY 11973.
D001205:Ascorbic Acid; D002412:Cations; D005561:Formates; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008345:Manganese; D017895:Manganese Compounds; D010084:Oxidation-Reduction; D010087:Oxides; D010710:Phosphates; D011675:Pulse Radiolysis; D012996:Solutions; D013053:Spectrophotometry; D013057:Spectrum Analysis; D013431:Sulfates
D002412:Cations; D005561:Formates; D017895:Manganese Compounds; D010087:Oxides; D010710:Phosphates; D012996:Solutions; D013431:Sulfates; C030544:formic acid; D008345:Manganese; D001205:Ascorbic Acid; C016552:manganese dioxide; C039798:manganese sulfate