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Abstract
The interaction of chlorophyll a with superoxide anion was studied in an alkaline DMSO-water system. It was found that O2, directly or via HO2, produces the chlorophyll enolate-ion (Molish's intermediate) that is oxidized to Mg-chlorine(s). The allomerization reaction was found to be inhibited by super oxide dismutase. A possible participation of oxygen radicals in chlorophyll degradation in plants is discussed.