Microbiological quality of high pressure (HP) treated fresh cheese of bovine milk

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Schaschke, C.J. and Okpala, COR and Piggott, J.R. and McNeil, B. (2009) Microbiological quality of high pressure (HP) treated fresh cheese of bovine milk. African Journal of Food Science, 3 (11). pp. 378-384. ISSN 1996-0794 (http://www.academicjournals.org/ajfs/PDF/Pdf2009/N...)

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Abstract

High pressure (HP) treatment at ambient temperature (25°C) was applied to freshly-prepared rennetcoagulated cheese of bovine (pasteurized) milk and the microbiological quality was examined for up to Day 31 using a Central Composite Design (CCD) of experiment. Bacterial counts were significantly (p < 0.05) reduced at the highest applied pressure. Estimated shelf-life was 17 days for control samples but approached 31 days at HP treatments of 150 MPa at 1 and 15 min. Treatments above 150 MPa with treatment time up to 29 min caused highly significant reductions in bacterial counts (p < 0.01 to p < 0.001). Gram-positive cocci and rods as well as Gram-negative rods were found during spoilage of the fresh cheese.

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