Dear Yacouti,

I hope you are doing well.

Please find attached two references of kits (Catalase & GST) based on colorimetric assay as well as the protocols. Hope that it matches your need.

Dear Abdellah Yacouti,

I agree with Dr.Abderrahim Alahyane.

If there is no interference, the colorimetric method is fine.

Protein extraction conditions would be critical, so unless you need a special procedure, try the method in the kit first.

Good luck!

In case you don't have kits you can use following article from our lab for Cat and GST estimations. Kindly modify sample preparations as per your requirments.

Article Concomitant changes in radiation resistance and trehalose le...