CAT activity
The catalase activity was assayed as described by Aebi with some modifications. The assay medium consisted
of 600 μmol sodium phosphate buffer (30 mM, pH 7.0) and 0.3 ml of enzymatic extract. The reaction was initiated
by adding 0.5 ml of 10 mmol H
2O2
. The enzymatic activity was determined by measuring the decrease in the
absorbance at 240 nm wavelength, for 30 s at 30°C, due to the H
2O2
consumption. One unit of enzyme activity was
defined as the amount of the enzyme catalyzing the decomposition of 1μmol H
2O2
per min at 30°C. CAT activity of
each extract was measured 3 times, and the results presented
correspond to the means of the values obtained from 3 different samples.