Extracts of 50 were assayed in a cuvette containing 2.7 ml of 50 mM Tris–Mes buffer, at pH 5.5, with 50 of Oxidianisidine as a hydrogen donor and 100lLof1%H2O2as the oxidant. Activity was assayed at 470 nm for 5 min at 25C using the UV–vis spectrophotometer – 1240 . One unit of activ-ity was defined as the change in absorption of 1.000 per min.