The reaction mixture consist 500 毺L of phosphate buffer, 100 毺L of 0.01 M GSH (reduced form),
100 毺L of 1.5 mM NADPH and 100 毺L of GR (0.24 units). The 100 毺L of tissue extract was added to the reaction mixture and incubated at 37 曟 for 10 min. Then 50 毺L of 12 mM t-butyl hydroperoxide was added to 450 毺L of tissue reaction mixture and measured at 340 nm for 1 min. The
molar extinction coefficient of 6.22 X 103 M cm-1 was used to determine the activity