The role of superoxide dismutase anion in the auto-oxidation of epinephrine and a simple assay for superoxide dismutase. ... The evaluation of SOD activity (U mg-1 protein) followed the indirect method (i.e. the epinephrine/adenochrome system) ... The role of superoxide dismutase anion in the auto-oxidation of epinephrine and a simple assay for superoxide dismutase. ...