Catalase (CAT, EC 1.11.1.6) activity was determined through the
reduction capacity of the hydrogen peroxide by the enzyme extract
monitored through absorbance at 240 nm and quantified by its
molar extinction coefficient (36 M/cm). One unit of CAT activity
(UA) was defined as the amount of enzyme required to decompose
H2O2. Results were expressed as lmol H2O2/min/mg P (Beers &
Sizer, 1952).