sample were incubated at 25 C for 1 min, and the change in
absorbance at 398 nm with time was recorded. Catalase (CAT) and
Superoxide dismutase (SOD) were assayed following the methods
ofWang and Tian (2005). CAT was extracted by 50 mmol/L sodium
phosphate buffer (pH 7.0). The reaction mixture consisted of 2 mL
sodium phosphate buffer (50 mmol/L, pH 7.0), 0.5 mL H2O2
(40 mmol/L) and 0.5 mL enzyme. The decomposition of H2O2 was
measured by the decline in absorbance at 240 nm.