The assay mixture consisted of 1 mL
of 75 mM phosphate buffer (pH 7.0), 10 lL of 150 mM reduced glutathione
(Sigma G4251), 10 lL of 46 U/mL glutathione reductase
(Sigma G3664), 30 lL of 25 mM EDTA, 30 lL of 5 mM NADPH (Sigma
N1630), 200 lL of supernatant, and 10 lL of 20% Triton X-100.
The final volume of the reaction mixture was 1.5 mL. The reaction
was started by addition of 50 lL of 7.5 mM H2O2