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Resistance of 17 mesophilic lactic Streptococcus bacteriophages to pasteurization and spray-drying

Published online by Cambridge University Press:  01 June 2009

Marie-Christine Chopin
Marie-Christine Chopin
Affiliation:
Institut National de la Recherche Agronomique, Laboratoire de Recherches de Technologie Laitière, 65 rue de Saint Brieuc, 35042 Rennes Cedex, France
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Summary

For 17 phages active against Streptococcus cremoris, Str. lactis and Str. lactis subsp. diacetylactis, the killing efficiency of pasteurization (log No/N) at 72°C for 15 s in skim-milk showed large variations from > 6 to 0; the efficienty of killing during spray-drying ranged from 3.7 to 0.2 and phages survived well storage of milk powder at room temperature. Destruction in a heat exchanger was found to be greater than that calculated from biphasic curves obtained by heating phages in sealed ampoules. No relationship was established between lytic classification of phages and their heat resistance.

Type
Original Articles
Information
Journal of Dairy Research , Volume 47 , Issue 1 , February 1980 , pp. 131 - 139
Copyright
Copyright © Proprietors of Journal of Dairy Research 1980

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