Determination of bacterial enzyme activity is widely studied in recent years both through
biochemical and molecular analysis. Catalase, peroxidase and superoxide dismutase are con sidered an important antioxidant enzymes that prevents cellular damage by the action of free
radicals. The researches have been carried out to study catalase activity in biomass of some
bacterial strains isolated from the lakes of the “La Izvor” park. The results of the study show that
out of 20 strains 17 are catalase-producing bacteria, where Bacillus safensis CNMN-BB-26 and
Pseudomonas poae CNMN-Ps-09 are active strains with values of 228,94 and 270,16 mmol/min/
mg protein, respectively, Bacillus velezensis CNMN-BB-14 produced the highest value of 380,68
mmol/min/mg protein.
