Effect of High Hydrostatic Pressure on Escherichia coli and Pseudomonas fluorescens Strains in Ovine Milk

R. Gervilla, X. Felipe, V. Ferragut, B. Guamis

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    46 Citations (Scopus)

    Abstract

    Ovine milk that had been standardized to 6% fat was inoculated with Escherichia coli 405 CECT and Pseudomonas fluorescens 378 CECT at a rate of 106 and 107 cfu/ml, respectively, and treated with high hydrostatic pressure. Treatments consisted of combinations of pressure (300, 400, 450, and 500 MPa), temperature (2, 10, 25, and 50°C), and time (5, 10, and 15 min). Inactivation (>6 log cfu/ml) of both strains was observed at 50°C for all pressures and treatment times. A similar level of inactivation occurred at >450 MPa and 25°C for E. coli and at >400 MPa and 10°C for P. fluorescens. Destruction was lowest at 10°C for E. coli and at 25°C for P. fluorescens. The test strain of E. coli was more baroresistent than was the P. fluorescens strain.
    Original languageEnglish
    Pages (from-to)2297-2303
    JournalJournal of Dairy Science
    Volume80
    Issue number10
    DOIs
    Publication statusPublished - 1 Jan 1997

    Keywords

    • Escherichia coli
    • Hydrostatic pressure
    • Ovine milk
    • Pseudomonas fluorescens

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