For the extraction of superoxide dismutase (SOD, EC 1.15.1.1) and
catalase (CAT, EC 1.11.1.6), 20 g of fresh pulp tissue was homogenized
in 60 mL 0.1 M potassium phosphate buffer (pH 7.8), 2 mM
DTT.5% (w/v) polyvinylpolypyrrolidone, 0.1 mM EDTA and 1.25 mM
polyethylene glycol