Short communication: Effect of homogenization on heat inactivation of Mycobacterium avium subspecies paratuberculosis in milk

Mycobacterium avium ssp. paratuberculosis (MAP) can be present in cow milk and low numbers may survive high-temperature, short-time (HTST) pasteurization. Although HTST treatment leads to inactivation of at least 5 log10 cycles, it might become necessary to enhance the efficacy of HTST by additional...

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Bibliographic Details
Published in:Journal of dairy science 2014-04, Vol.97 (4), p.2045-2048
Main Authors: Hammer, P., Kiesner, C., Walte, H.-G. C.
Format: Article
Language:English
Subjects:
Animals
Cattle
Female
Food Contamination
Food Microbiology
heat inactivation
homogenization
Hot Temperature
Microbial Viability
milk
Milk - microbiology
Mycobacterium avium subsp. paratuberculosis - isolation & purification
Mycobacterium paratuberculosis
Pasteurization
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Summary:Mycobacterium avium ssp. paratuberculosis (MAP) can be present in cow milk and low numbers may survive high-temperature, short-time (HTST) pasteurization. Although HTST treatment leads to inactivation of at least 5 log10 cycles, it might become necessary to enhance the efficacy of HTST by additional treatments such as homogenization if the debate about the role of MAP in Crohn’s disease of humans concludes that MAP is a zoonotic agent. This study aimed to determine whether disrupting the clumps of MAP in milk by homogenization during the heat treatment process would enhance the inactivation of MAP. We used HTST pasteurization in a continuous-flow pilot-plant pasteurizer and evaluated the effect of upstream, downstream, and in-hold homogenization on inactivation of MAP. Reduction of MAP at 72°C with a holding time of 28s was between 3.7 and 6.9 log10 cycles, with an overall mean of 5.5 log10 cycles. None of the 3 homogenization modes applied showed a statistically significant additional effect on the inactivation of MAP during HTST treatment.
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.2013-7361