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Relationship between temperature and sterilizing efficiency of heat treatments of equal duration. Experimental testing with suspensions of spores in milk heated in an ultra-high-temperature sterilizer

Published online by Cambridge University Press:  01 June 2009

J. Hermier ,
P. Begue  and
O. Cerf
J. Hermier
Affiliation:
Laboratoire de Biochimie Microbienne, Institut National de la Recherche Agronomique, 78350 Jouy-en-Josas, France
P. Begue
Affiliation:
Laboratoire de Biochimie Microbienne, Institut National de la Recherche Agronomique, 78350 Jouy-en-Josas, France
O. Cerf
Affiliation:
Laboratoire de Biochimie Microbienne, Institut National de la Recherche Agronomique, 78350 Jouy-en-Josas, France
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Summary

A relationship between temperature and sterilizing efficiency of heat treatment at constant time is described and checked experimentally using spores of Bacillus coagulans 604 in a pilot ultra-high-temperature plant. The relation is:

where N0 and N are initial and final concentrations of spores, T the temperature (°C), z the temperature coefficient (°C, z=10/logQ10) and A a dimensionless constant. A special effect of the injection of spores into live steam is observed. The sterilizing efficiency curve can be used in determining the heating temperature for a desired sterilizing efficiency and in predicting the influence of temperature fluctuation on sterilizing efficiency.

Type
Research Article
Information
Journal of Dairy Research , Volume 42 , Issue 3 , October 1975 , pp. 437 - 444
Copyright
Copyright © Proprietors of Journal of Dairy Research 1975

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References

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