Investigation of the antimicrobial activity of raw milk against several foodborne pathogens

Wayne Pitt, Terence Harden, Ronald R. Hull

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The antimicrobial activity of raw milkagainst Staphylococcus aureus, Salmonella enteritidis and Listeria. monocytogeneswas investigated. Populations of Staph. aureus and S. enteritidis in raw and pasteurised milkat 37°C increased from approximately104cfu/ml during the first 24-32 h of incubation to greater than 108cfu/ml, however, declined throughout theremainder of the experimental period in raw milk and to a lesser extent in pasteurised milk. Final populations of Staph.aureus and S. enteritidis after 72 h of incubation at 37°C were approximately 106cfu/ml and 107cfu/ml in pasteurised milkand 104cfu/ml and 105cfu/ml in raw milkrespectively. L. monocytogenes inoculated into raw milkat37°Cto give an initialbacterial concentration of approximately 104cfu/ml, multiplied at a reduced rate for approximately 12 h and then rapidlylost viability. Fifty-sixhours after the inoculation of raw milkno viable cells of L. monocytogenes were detectable. The pHof all treatment samples and controls declined to approximately 4.0 after 72 h of incubation at 37°C.
Original languageEnglish
Pages (from-to)249-252
Number of pages4
JournalMilchwissenschaft
Volume55
Issue number5
Publication statusPublished - 2000

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