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The sterilizing effect against Bacillus subtilis spores of hydrogen peroxide at different temperatures and concentrations

Published online by Cambridge University Press:  01 June 2009

P. Swartling
Affiliation:
Food Research Institute, Alnarp, Sweden
B. Lindgren
Affiliation:
Food Research Institute, Alnarp, Sweden

Summary

An investigation was made of the death-rate of Bacillus subtilis spores in suspension in hydrogen peroxide concentrations of 10, 15 and 20% at 25, 50, 60, 70 and 80°C. Average logarithmic survival curves were plotted against normal time and death-rate constants and Q10 values were calculated from the graphically determined decimal reduction times. This treatment of the experimental findings was found to be warranted in the temperature range 60–80°C. The first-order death-rate constant was ∽ 0·1 s−1 for 10% hydrogen peroxide solution at 60°C and the Q10 was about 1·6. Increases in the concentration from 10 to 15% and from 15 to 20% each gave an increase of about 50% in the rate constant. The application of these data to commercial practice is discussed.

Type
Original Articles
Copyright
Copyright © Proprietors of Journal of Dairy Research 1968

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References

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