ORIGINAL RESEARCH: The formation of thermophilic spores during the manufacture of whole milk powder

A survey was undertaken at a whole milk powder manufacturing plant to determine the origin and the rate of spore formation of thermophilic bacteria. Spores were generally not detected (< 10 cfu/mL) in either the pasteurization process or the pasteurized milk directed into the powder plant. The pr...

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Bibliographic Details
Published in:International journal of dairy technology 2007-05, Vol.60 (2), p.109
Main Authors: Scott, Sara A, Brooks, John D, Rakonjac, Jasna, Walker, Kylie M R, Flint, Steve H
Format: Article
Language:English
Subjects:
Analysis
Food contamination & poisoning
Industrial plants
Manufacturing
Microbiology
Milk
Pasteurization
Studies
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Summary:A survey was undertaken at a whole milk powder manufacturing plant to determine the origin and the rate of spore formation of thermophilic bacteria. Spores were generally not detected (< 10 cfu/mL) in either the pasteurization process or the pasteurized milk directed into the powder plant. The predominant sites of spore formation were the preheater plate heat exchanger and the evaporator. Spores began to be detected approximately 9 h into an 18-h manufacturing run. Spore isolates were identified as Anoxybacillus flavithermus and Geobacillus species. A. flavithermus predominated in the preheat section, whereas a mix of both organisms was present in the later manufacturing stages. [PUBLICATION ABSTRACT]
ISSN:1364-727X
1471-0307
DOI:10.1111/j.1471-0307.2007.00309.x