Also found in: Dictionary, Thesaurus, Medical, Acronyms, Wikipedia.


An enzyme that catalyzes the decomposition of hydrogen peroxide into molecular oxygen and water.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Mean values of 96-h LC50 and lethal concentrations were calculated for MM treatment with 95% confidence interval by using the Probit analyses method (Hamilton et al., 1977) with the help of MINITAB while the data on accumulation and catalase assay were analyzed by using Statistix 8.1 computer software.
The increase of peroxidase and catalase activity in overcoming dormancy treatments with heated water at 75 and 95[degrees]C is indicative that these enzymes acted to keep low levels of the [H.sub.2][O.sub.2] radical in the apoplast of the tegument cells, enabling in this way the loosening of their walls and facilitating the water inflow and germination.
Human catalase, its polymorphisms, regulation and changes of its activity in different diseases.
(2013) A simple assay for measuring catalase activity: A visual approach.
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).
An enzymatic defense system include catalase and ascorbate peroxidase (Desikan et al., 2004).
The 16S rRNA gene of the strain shares high sequence identity with isolates from the termite hindgut (Figure 2), and also, some characteristic features, such as catalase, have been identified in M.
Catalase from bovine liver (CAT, EC, activity [greater than or equal to] 10,000 U [mg.sup.-1] protein) was supplied by Sigma-Aldrich (Switzerland) and stored at -20[degrees]C.
It was unexpected since in our previous investigations [K.sub.2][[B.sub.3][O.sub.3][F.sub.4]OH] showed noncompetitive inhibition of enzymes catalase and different carbonic anhydrases [11, 12].
Catalase. Catalase plays a critical role in ROS metabolism.
Jia and his colleagues have produced the recombinant catalase in Escherichia coli from Geobacillus sp.