Does anyone have complete assay protocols with formulas for Catalase (EC 1.11.1.6), SOD (EC 1.15.1.1), Glutathione Peroxidase (EC 1.11.1.9), Glutathione-S-transferase (EC 2.5.1.18)? As methodology was provided in most of literature, formulas for calculating enzyme activity not provided. Many researchers using modifications during assay, can anyone provide complete standardize assay protocols with formula. I require it for fish and shrimp tissue. 

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