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Lett Appl Microbiol ; 56(2): 142-8, 2013 Feb.
Article in English | MEDLINE | ID: mdl-23190052

ABSTRACT

Multiple-pass ultrahigh pressure homogenization (UHPH) was used for reducing microbial population of both indigenous spoilage microflora in whole raw milk and a baroresistant pathogen (Staphylococcus aureus) inoculated in whole sterile milk to define pasteurization-like processing conditions. Response surface methodology was followed and multiple response optimization of UHPH operating pressure (OP) (100, 175, 250 MPa) and number of passes (N) (1-5) was conducted through overlaid contour plot analysis. Increasing OP and N had a significant effect (P < 0·05) on microbial reduction of both spoilage microflora and Staph. aureus in milk. Optimized UHPH processes (five 202-MPa passes; four 232-MPa passes) defined a region where a 5-log(10) reduction of total bacterial count of milk and a baroresistant pathogen are attainable, as a requisite parameter for establishing an alternative method of pasteurization. Multiple-pass UHPH optimized conditions might help in producing safe milk without the detrimental effects associated with thermal pasteurization.


Subject(s)
Food Handling/methods , Food Microbiology/methods , Milk/microbiology , Pasteurization/methods , Pressure , Staphylococcus aureus/physiology , Animals , Colony Count, Microbial , Models, Theoretical , Temperature
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