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Appl Environ Microbiol. 1968 February; 16(2): 267-270
Copyright © 1968 American Society for Microbiology. All Rights Reserved.

Influence of Catalase Activity on Resistance of Coagulase-positive Staphylococci to Hydrogen Peroxide1

V. M. Amin and N. F. Olson

Department of Food Science and Industries, University of Wisconsin, Madison, Wisconsin 53706

ABSTRACT

Catalase activities of intact cells and cell-free extracts of coagulase-positive staphylococcal cultures 105B and 558D isolated from milk, culture 25042 from a clinical source, and Staphylococcus aureus 196E were determined at 32.2 C. Cultures were treated with 0.025 and 0.05% hydrogen peroxide at 37.8 and 54.4 C and without hydrogen peroxide at 54.4 C to determine the relationship between catalase activity and resistance to these treatments. The relationship held true for cultures 105B and 196E; culture 105B had the lowest catalase activity and lowest resistance to H2O2 at 37.8 C, whereas S. aureus 196E possessed a high catalase activity and was most resistant at 37.8 C. Catalase activities of cell-free extracts of cultures 25042, 558, and 196E were similar, but resistance to H2O2 at 37.8 C was greater for culture 196E. The lower resistance of culture 25042 was related to low catalase activities of whole cells of this culture, which were only one-third that of whole cells of culture 196E. Culture 558 was least resistant to heat treatment at 54.4 C and showed the greatest sensitivity to added H2O2 at this temperature.

FOOTNOTES

1 Published with approval of Director of Wisconsin Agricultural Experiment Station.

Appl Environ Microbiol. 1968 February; 16(2): 267-270
Copyright © 1968 American Society for Microbiology. All Rights Reserved.





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