Ten grams of each cabbage were chopped and then 30 ml
of distilled water added during homogenation. The slurry was
centrifuged (SIGMA-3K30) at 10,000×g for 15 min at 4 ◦C. The
supernatant, which contained peroxidase activity, was used as the
enzyme source for the experiment (Ponce et al., 2004).