Survival of Staphylococcus aureus during the manufacture and ripening of camembert cheese : a thesis presented in partial fulfilment of the requirements for the degree of Master of Food Technology, Massey University, Palmerston North, New Zealand
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Date
2017
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Massey University
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Abstract
Staphylococcal Food Poisoning (SFP) is the third most common cause of food poisoning
internationally, caused by an enterotoxin produced by Staphylococcus aureus. S. aureus
contamination in dairy products, including cheese, can lead to SFP. The survivability of S.
aureus during the manufacture and ripening of Camembert cheese was the focus of this
study. Camembert cheeses were manufactured using pasteurized milk inoculated with one of
three S. aureus strains, comprising two reference strains ATCC 4163, ATCC 9144 and one dairy
strain 172 RR. Each strain was tested in triplicate. The results showed that manufacturing and
ripening of Camembert cheese reduced the risk of food safety associated with contamination
with S. aureus with a 1.6 to 3.1 log reduction. The largest decrease occurred following
drainage, which was particularly evident in 172 RR, and coincided with the lowest pH. The
combined effect of culture blend (starter and secondary flora) activity and low pH are believed
to contribute to the death of S. aureus.
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Keywords
Camembert cheese, Microbiology, Staphylococcus aureus, Research Subject Categories::TECHNOLOGY::Chemical engineering::Food technology