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Article: Fat content increases the lethality of ultra-high-pressure homogenization on Listeria monocytogenes in milk
- Article from:
- Journal of Dairy Science
- Article date:
- November 1, 2009
- Author:
CopyrightCopyright American Dairy Science Association Nov 2009. Provided by ProQuest LLC. (Hide copyright information)
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ABSTRACT
Listeria monocytogenes CCUG 15526 was inoculated at a concentration of approximately 7.0 log^sub 10^ cfu/mL in milk samples with 0.3, 3.6, 10, and 15% fat contents. Milk samples with 0.3 and 3.6% fat content were also inoculated with a lower load of approximately 3.0 log^sub 10^ cfu/mL. Inoculated milk samples were subjected to a single cycle of ultra-high-pressure homogenization (UHPH) treatment at 200, 300, and 400 MPa. Microbiological analyses were performed 2 h after the UHPH treatments and after 5, 8, and 15 d of storage at 4°C. Maximum lethality values were observed in samples treated at 400 MPa with 15 and 10% fat (7.95 and 7.46 log^sub 10^ cfu/mL), respectively. However, ...