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An enzyme that catalyzes the decomposition of hydrogen peroxide into molecular oxygen and water.



an enzyme of the hydroperoxidase group that catalyzes the oxidation-reduction reaction during which water and oxygen are formed from two molecules of hydrogen peroxide:

Catalase is obtained in crystalline form; its molecular mass is 250, 000. The enzyme is widely distributed in the cells of animals, plants, and microorganisms. It is a chromoprotein having an oxidized heme as a prosthetic (nonprotein) group. Since the specificity of catalase for a substrate-reducing agent is low, it can catalyze not only the decomposition of H202 but also the oxidation of the lower alcohols. The function of catalase is to destroythe toxic hydrogen peroxide that forms in the body during vari-ous oxidative processes.

References in periodicals archive ?
Biochemical tests like catalase test, citrate utilization test, gram staining, indole test, oxidase test, starch hydrolysis test and urease test, etc.
Human catalase, its polymorphisms, regulation and changes of its activity in different diseases.
Antioxidant enzymes superoxide dismutase, glutathione peroxidase, catalase, and antioxidant substances are among the antioxidative materials of the antioxidative system of the body that has an inherent place within this system (5).
2003) have shown catalase and SOD activities decreased in fasted rat livers but they did not alter in GPx activity in fasted rat livers.
074 Table 3: Mean [+ or -] SD, P-value of MDA, TAA, TAA/MDA, catalase enzyme in control and patients with acromegaly Parameter Control Patients t-test p-value Mean [+ or -] Mean [+ or -] SD SD MDA([micro] 3.
Evaluation of soluble proteins and the enzymatic activity of catalase and ascorbate peroxidase in sugarcane varieties subjected to different salinity levels Variety NaCI levels (mM) 0 50 100 Soluble proteins (mg [g.
Some studies note that, apart from genetic factors, catalase activities are influenced by a number of environmental factors, for example, seasonal variations [36, 37].
The activity of antioxidant system revealed that a huge activation of catalase and ascorbic acid peroxidase in genotype Giza-716 followed be genotype Sakha-2.
elaeocarpum presented one, two, six and one isoform (s) of [alpha]-amylase, catalase, esterase and peroxidase, respectively (Figure 1).
Given the important physiological role of catalase, it is necessary to determine the mineral water's enzymatic activity.