Abstract
Chlorogenic acid (CGA; 3- o-caffeoylquinic acid), a phenylpropanoid metabolite of plants, was oxidized by H 2O 2 in the presence of horseradish peroxidase. The primary and secondary oxidized products both were free radicals which gave EPR multiline signals at g=2.0044 and 2.0042 in the presence of zinc as a spin stabilizing agent. The EPR kinetics showed that ascorbate functioned as a cooperative reductant by regenerating CGA from its corresponding radicals. These results provide evidence to support the idea that the ascorbate-phenolic redox couple in conjunction with guaiacol peroxidase is an efficient H 2O 2 scavenging mechanism in higher plants.
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